Tree weeks later than I promised, but it is finished (I hope).
In attachment are files:
dblink.c
dblink.h
dblink.sql.in
pqtest.sql
In file pqtest.sql is sample queries and results. It seem OK to me.
There are two reasons why I did not make a diff.
1. The source I started from is 7.3b1, not the latest.
2. I would like You to check the code, especially the part that touches memory
management.
I can say that it works, but I do not know exactly why, and this can be
dangerous. With my knowledge of postgres internals this is
as far I can go at the moment. And once more sorry for bad English !
Regards !
/*
* dblink.c
*
* Functions returning results from a remote database
*
* Joe Conway <[EMAIL PROTECTED]>
*
* Copyright (c) 2001, 2002 by PostgreSQL Global Development Group
* ALL RIGHTS RESERVED;
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written agreement
* is hereby granted, provided that the above copyright notice and this
* paragraph and the following two paragraphs appear in all copies.
*
* IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
* DOCUMENTATION, EVEN IF THE AUTHOR OR DISTRIBUTORS HAVE BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHOR AND DISTRIBUTORS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAS NO OBLIGATIONS TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
*/
#include "postgres.h"
#include "libpq-fe.h"
#include "fmgr.h"
#include "funcapi.h"
#include "access/tupdesc.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/namespace.h"
#include "catalog/pg_index.h"
#include "catalog/pg_type.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "lib/stringinfo.h"
#include "nodes/nodes.h"
#include "nodes/execnodes.h"
#include "nodes/pg_list.h"
#include "parser/parse_type.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/array.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "dblink.h"
/*
* Internal declarations
*/
static dblink_results *init_dblink_results(MemoryContext fn_mcxt);
static public_pq_connections *init_public_connections();
static public_pq_results *init_public_results();
static char **get_pkey_attnames(Oid relid, int16 *numatts);
static char *get_sql_insert(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
static char *get_sql_delete(Oid relid, int16 *pkattnums, int16 pknumatts, char **tgt_pkattvals);
static char *get_sql_update(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
static char *quote_literal_cstr(char *rawstr);
static char *quote_ident_cstr(char *rawstr);
static int16 get_attnum_pk_pos(int16 *pkattnums, int16 pknumatts, int16 key);
static HeapTuple get_tuple_of_interest(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals);
static Oid get_relid_from_relname(text *relname_text);
static dblink_results *get_res_ptr(int32 res_id_index);
static void append_res_ptr(dblink_results * results);
static void remove_res_ptr(dblink_results * results);
static TupleDesc pgresultGetTupleDesc(PGresult *res);
static public_pq_connections *get_public_conn(int32 public_conn_id_index);
static void append_public_conn(public_pq_connections * connections);
static void remove_public_conn(public_pq_connections * connections);
static public_pq_results *get_public_res(int32 public_res_id_index);
static void append_public_res(public_pq_results * results);
static void remove_public_res(public_pq_results * results);
static PGresult* getResultPointer(int32 nResId, bool removePointer);
static PGconn* getConnPointer(int32 nConnId,bool removePointer);
/* Global */
List *res_id = NIL;
int res_id_index = 0;
List *public_conn_id = NIL;
int public_conn_id_index = 0;
List *public_res_id = NIL;
int public_res_id_index = 0;
PGconn *persistent_conn = NULL;
#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(cstrp)))
#define GET_STR(textp) DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp)))
#define xpfree(var_) \
do { \
if (var_ != NULL) \
{ \
pfree(var_); \
var_ = NULL; \
} \
} while (0)
/*
* Create a persistent connection to another database
*/
PG_FUNCTION_INFO_V1(dblink_connect);
Datum
dblink_connect(PG_FUNCTION_ARGS)
{
char *connstr = GET_STR(PG_GETARG_TEXT_P(0));
char *msg;
text *result_text;
MemoryContext oldcontext;
if (persistent_conn != NULL)
PQfinish(persistent_conn);
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
persistent_conn = PQconnectdb(connstr);
MemoryContextSwitchTo(oldcontext);
if (PQstatus(persistent_conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(persistent_conn));
PQfinish(persistent_conn);
persistent_conn = NULL;
elog(ERROR, "dblink_connect: connection error: %s", msg);
}
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("OK")));
PG_RETURN_TEXT_P(result_text);
}
/*
* Clear a persistent connection to another database
*/
PG_FUNCTION_INFO_V1(dblink_disconnect);
Datum
dblink_disconnect(PG_FUNCTION_ARGS)
{
text *result_text;
if (persistent_conn != NULL)
PQfinish(persistent_conn);
persistent_conn = NULL;
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("OK")));
PG_RETURN_TEXT_P(result_text);
}
/*
* opens a cursor using a persistent connection
*/
PG_FUNCTION_INFO_V1(dblink_open);
Datum
dblink_open(PG_FUNCTION_ARGS)
{
char *msg;
PGresult *res = NULL;
PGconn *conn = NULL;
text *result_text;
char *curname = GET_STR(PG_GETARG_TEXT_P(0));
char *sql = GET_STR(PG_GETARG_TEXT_P(1));
StringInfo str = makeStringInfo();
if (persistent_conn != NULL)
conn = persistent_conn;
else
elog(ERROR, "dblink_open: no connection available");
res = PQexec(conn, "BEGIN");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
persistent_conn = NULL;
elog(ERROR, "dblink_open: begin error: %s", msg);
}
PQclear(res);
appendStringInfo(str, "DECLARE %s CURSOR FOR %s", quote_ident_cstr(curname), sql);
res = PQexec(conn, str->data);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
persistent_conn = NULL;
elog(ERROR, "dblink: sql error: %s", msg);
}
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("OK")));
PG_RETURN_TEXT_P(result_text);
}
/*
* closes a cursor
*/
PG_FUNCTION_INFO_V1(dblink_close);
Datum
dblink_close(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
PGresult *res = NULL;
char *curname = GET_STR(PG_GETARG_TEXT_P(0));
StringInfo str = makeStringInfo();
text *result_text;
char *msg;
if (persistent_conn != NULL)
conn = persistent_conn;
else
elog(ERROR, "dblink_close: no connection available");
appendStringInfo(str, "CLOSE %s", quote_ident_cstr(curname));
/* close the cursor */
res = PQexec(conn, str->data);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(persistent_conn);
persistent_conn = NULL;
elog(ERROR, "dblink_close: sql error: %s", msg);
}
PQclear(res);
/* commit the transaction */
res = PQexec(conn, "COMMIT");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(persistent_conn);
persistent_conn = NULL;
elog(ERROR, "dblink_close: commit error: %s", msg);
}
PQclear(res);
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("OK")));
PG_RETURN_TEXT_P(result_text);
}
/*
* Fetch results from an open cursor
*/
PG_FUNCTION_INFO_V1(dblink_fetch);
Datum
dblink_fetch(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
TupleDesc tupdesc = NULL;
int call_cntr;
int max_calls;
TupleTableSlot *slot;
AttInMetadata *attinmeta;
char *msg;
PGresult *res = NULL;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
Oid functypeid;
char functyptype;
Oid funcid = fcinfo->flinfo->fn_oid;
PGconn *conn = NULL;
StringInfo str = makeStringInfo();
char *curname = GET_STR(PG_GETARG_TEXT_P(0));
int howmany = PG_GETARG_INT32(1);
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function
* calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
if (persistent_conn != NULL)
conn = persistent_conn;
else
elog(ERROR, "dblink_fetch: no connection available");
appendStringInfo(str, "FETCH %d FROM %s", howmany, quote_ident_cstr(curname));
res = PQexec(conn, str->data);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(persistent_conn);
persistent_conn = NULL;
elog(ERROR, "dblink_fetch: sql error: %s", msg);
}
else if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/* cursor does not exist - closed already or bad name */
PQclear(res);
elog(ERROR, "dblink_fetch: cursor %s does not exist", quote_ident_cstr(curname));
}
funcctx->max_calls = PQntuples(res);
/* got results, keep track of them */
funcctx->user_fctx = res;
/* fast track when no results */
if (funcctx->max_calls < 1)
SRF_RETURN_DONE(funcctx);
/* check typtype to see if we have a predetermined return type */
functypeid = get_func_rettype(funcid);
functyptype = get_typtype(functypeid);
if (functyptype == 'c')
tupdesc = TypeGetTupleDesc(functypeid, NIL);
else if (functyptype == 'p' && functypeid == RECORDOID)
tupdesc = pgresultGetTupleDesc(res);
else if (functyptype == 'b')
elog(ERROR, "dblink_fetch: invalid kind of return type specified for function");
else
elog(ERROR, "dblink_fetch: unknown kind of return type specified for function");
/* store needed metadata for subsequent calls */
slot = TupleDescGetSlot(tupdesc);
funcctx->slot = slot;
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
slot = funcctx->slot;
res = (PGresult *) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
tupdesc = attinmeta->tupdesc;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
int i;
int nfields = PQnfields(res);
values = (char **) palloc(nfields * sizeof(char *));
for (i = 0; i < nfields; i++)
{
if (PQgetisnull(res, call_cntr, i) == 0)
values[i] = PQgetvalue(res, call_cntr, i);
else
values[i] = NULL;
}
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = TupleGetDatum(slot, tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
/* do when there is no more left */
{
PQclear(res);
SRF_RETURN_DONE(funcctx);
}
}
/*
* Note: this is the new preferred version of dblink
*/
PG_FUNCTION_INFO_V1(dblink_record);
Datum
dblink_record(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
TupleDesc tupdesc = NULL;
int call_cntr;
int max_calls;
TupleTableSlot *slot;
AttInMetadata *attinmeta;
char *msg;
PGresult *res = NULL;
bool is_sql_cmd = false;
char *sql_cmd_status = NULL;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
Oid functypeid;
char functyptype;
Oid funcid = fcinfo->flinfo->fn_oid;
PGconn *conn = NULL;
char *connstr = NULL;
char *sql = NULL;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function
* calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
if (fcinfo->nargs == 2)
{
connstr = GET_STR(PG_GETARG_TEXT_P(0));
sql = GET_STR(PG_GETARG_TEXT_P(1));
conn = PQconnectdb(connstr);
if (PQstatus(conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(conn));
PQfinish(conn);
elog(ERROR, "dblink: connection error: %s", msg);
}
}
else if (fcinfo->nargs == 1)
{
sql = GET_STR(PG_GETARG_TEXT_P(0));
if (persistent_conn != NULL)
conn = persistent_conn;
else
elog(ERROR, "dblink: no connection available");
}
else
elog(ERROR, "dblink: wrong number of arguments");
res = PQexec(conn, sql);
if (!res || (PQresultStatus(res) != PGRES_COMMAND_OK && PQresultStatus(res) != PGRES_TUPLES_OK))
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
if (fcinfo->nargs == 1)
persistent_conn = NULL;
elog(ERROR, "dblink: sql error: %s", msg);
}
else
{
if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
is_sql_cmd = true;
/* need a tuple descriptor representing one TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0, false);
/*
* and save a copy of the command status string to return
* as our result tuple
*/
sql_cmd_status = PQcmdStatus(res);
funcctx->max_calls = 1;
}
else
funcctx->max_calls = PQntuples(res);
/* got results, keep track of them */
funcctx->user_fctx = res;
/* if needed, close the connection to the database and cleanup */
if (fcinfo->nargs == 2)
PQfinish(conn);
}
/* fast track when no results */
if (funcctx->max_calls < 1)
SRF_RETURN_DONE(funcctx);
/* check typtype to see if we have a predetermined return type */
functypeid = get_func_rettype(funcid);
functyptype = get_typtype(functypeid);
if (!is_sql_cmd)
{
if (functyptype == 'c')
tupdesc = TypeGetTupleDesc(functypeid, NIL);
else if (functyptype == 'p' && functypeid == RECORDOID)
tupdesc = pgresultGetTupleDesc(res);
else if (functyptype == 'b')
elog(ERROR, "Invalid kind of return type specified for function");
else
elog(ERROR, "Unknown kind of return type specified for function");
}
/* store needed metadata for subsequent calls */
slot = TupleDescGetSlot(tupdesc);
funcctx->slot = slot;
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
slot = funcctx->slot;
res = (PGresult *) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
tupdesc = attinmeta->tupdesc;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
if (!is_sql_cmd)
{
int i;
int nfields = PQnfields(res);
values = (char **) palloc(nfields * sizeof(char *));
for (i = 0; i < nfields; i++)
{
if (PQgetisnull(res, call_cntr, i) == 0)
values[i] = PQgetvalue(res, call_cntr, i);
else
values[i] = NULL;
}
}
else
{
values = (char **) palloc(1 * sizeof(char *));
values[0] = sql_cmd_status;
}
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = TupleGetDatum(slot, tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
/* do when there is no more left */
{
PQclear(res);
SRF_RETURN_DONE(funcctx);
}
}
/*
* Execute an SQL non-SELECT command
*/
PG_FUNCTION_INFO_V1(dblink_exec);
Datum
dblink_exec(PG_FUNCTION_ARGS)
{
char *msg;
PGresult *res = NULL;
char *sql_cmd_status = NULL;
TupleDesc tupdesc = NULL;
text *result_text;
PGconn *conn = NULL;
char *connstr = NULL;
char *sql = NULL;
if (fcinfo->nargs == 2)
{
connstr = GET_STR(PG_GETARG_TEXT_P(0));
sql = GET_STR(PG_GETARG_TEXT_P(1));
conn = PQconnectdb(connstr);
if (PQstatus(conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(conn));
PQfinish(conn);
elog(ERROR, "dblink_exec: connection error: %s", msg);
}
}
else if (fcinfo->nargs == 1)
{
sql = GET_STR(PG_GETARG_TEXT_P(0));
if (persistent_conn != NULL)
conn = persistent_conn;
else
elog(ERROR, "dblink_exec: no connection available");
}
else
elog(ERROR, "dblink_exec: wrong number of arguments");
res = PQexec(conn, sql);
if (!res || (PQresultStatus(res) != PGRES_COMMAND_OK && PQresultStatus(res) != PGRES_TUPLES_OK))
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
if (fcinfo->nargs == 1)
persistent_conn = NULL;
elog(ERROR, "dblink_exec: sql error: %s", msg);
}
else
{
if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/* need a tuple descriptor representing one TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0, false);
/*
* and save a copy of the command status string to return as
* our result tuple
*/
sql_cmd_status = PQcmdStatus(res);
}
else
elog(ERROR, "dblink_exec: queries returning results not allowed");
}
PQclear(res);
/* if needed, close the connection to the database and cleanup */
if (fcinfo->nargs == 2)
PQfinish(conn);
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(sql_cmd_status)));
PG_RETURN_TEXT_P(result_text);
}
/*
* Note: this original version of dblink is DEPRECATED;
* it *will* be removed in favor of the new version on next release
*/
PG_FUNCTION_INFO_V1(dblink);
Datum
dblink(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
PGresult *res = NULL;
dblink_results *results;
char *optstr;
char *sqlstatement;
char *execstatement;
char *msg;
int ntuples = 0;
ReturnSetInfo *rsi;
if (fcinfo->resultinfo == NULL || !IsA(fcinfo->resultinfo, ReturnSetInfo))
elog(ERROR, "dblink: function called in context that does not accept a set result");
optstr = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(PG_GETARG_TEXT_P(0))));
sqlstatement = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(PG_GETARG_TEXT_P(1))));
if (fcinfo->flinfo->fn_extra == NULL)
{
conn = PQconnectdb(optstr);
if (PQstatus(conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(conn));
PQfinish(conn);
elog(ERROR, "dblink: connection error: %s", msg);
}
execstatement = (char *) palloc(strlen(sqlstatement) + 1);
if (execstatement != NULL)
{
strcpy(execstatement, sqlstatement);
strcat(execstatement, "\0");
}
else
elog(ERROR, "dblink: insufficient memory");
res = PQexec(conn, execstatement);
if (!res || (PQresultStatus(res) != PGRES_COMMAND_OK && PQresultStatus(res) != PGRES_TUPLES_OK))
{
msg = pstrdup(PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
elog(ERROR, "dblink: sql error: %s", msg);
}
else
{
/*
* got results, start fetching them
*/
ntuples = PQntuples(res);
/*
* increment resource index
*/
res_id_index++;
results = init_dblink_results(fcinfo->flinfo->fn_mcxt);
results->tup_num = 0;
results->res_id_index = res_id_index;
results->res = res;
/*
* Append node to res_id to hold pointer to results. Needed by
* dblink_tok to access the data
*/
append_res_ptr(results);
/*
* save pointer to results for the next function manager call
*/
fcinfo->flinfo->fn_extra = (void *) results;
/* close the connection to the database and cleanup */
PQfinish(conn);
rsi = (ReturnSetInfo *) fcinfo->resultinfo;
rsi->isDone = ExprMultipleResult;
PG_RETURN_INT32(res_id_index);
}
}
else
{
/*
* check for more results
*/
results = fcinfo->flinfo->fn_extra;
results->tup_num++;
res_id_index = results->res_id_index;
ntuples = PQntuples(results->res);
if (results->tup_num < ntuples)
{
/*
* fetch them if available
*/
rsi = (ReturnSetInfo *) fcinfo->resultinfo;
rsi->isDone = ExprMultipleResult;
PG_RETURN_INT32(res_id_index);
}
else
{
/*
* or if no more, clean things up
*/
results = fcinfo->flinfo->fn_extra;
remove_res_ptr(results);
PQclear(results->res);
pfree(results);
fcinfo->flinfo->fn_extra = NULL;
rsi = (ReturnSetInfo *) fcinfo->resultinfo;
rsi->isDone = ExprEndResult;
PG_RETURN_NULL();
}
}
PG_RETURN_NULL();
}
/*
* Note: dblink_tok is DEPRECATED;
* it *will* be removed in favor of the new version on next release
*
* dblink_tok
* parse dblink output string
* return fldnum item (0 based)
* based on provided field separator
*/
PG_FUNCTION_INFO_V1(dblink_tok);
Datum
dblink_tok(PG_FUNCTION_ARGS)
{
dblink_results *results;
int fldnum;
text *result_text;
char *result;
int nfields = 0;
int text_len = 0;
results = get_res_ptr(PG_GETARG_INT32(0));
if (results == NULL)
{
if (res_id != NIL)
{
freeList(res_id);
res_id = NIL;
res_id_index = 0;
}
elog(ERROR, "dblink_tok: function called with invalid resource id");
}
fldnum = PG_GETARG_INT32(1);
if (fldnum < 0)
elog(ERROR, "dblink_tok: field number < 0 not permitted");
nfields = PQnfields(results->res);
if (fldnum > (nfields - 1))
elog(ERROR, "dblink_tok: field number %d does not exist", fldnum);
if (PQgetisnull(results->res, results->tup_num, fldnum) == 1)
PG_RETURN_NULL();
else
{
text_len = PQgetlength(results->res, results->tup_num, fldnum);
result = (char *) palloc(text_len + 1);
if (result != NULL)
{
strcpy(result, PQgetvalue(results->res, results->tup_num, fldnum));
strcat(result, "\0");
}
else
elog(ERROR, "dblink: insufficient memory");
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(result)));
PG_RETURN_TEXT_P(result_text);
}
}
/*
* dblink_get_pkey
*
* Return list of primary key fields for the supplied relation,
* or NULL if none exists.
*/
PG_FUNCTION_INFO_V1(dblink_get_pkey);
Datum
dblink_get_pkey(PG_FUNCTION_ARGS)
{
int16 numatts;
Oid relid;
char **results;
FuncCallContext *funcctx;
int32 call_cntr;
int32 max_calls;
TupleTableSlot *slot;
AttInMetadata *attinmeta;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
TupleDesc tupdesc = NULL;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function
* calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* convert relname to rel Oid */
relid = get_relid_from_relname(PG_GETARG_TEXT_P(0));
if (!OidIsValid(relid))
elog(ERROR, "dblink_get_pkey: relation does not exist");
/*
* need a tuple descriptor representing one INT and one TEXT
* column
*/
tupdesc = CreateTemplateTupleDesc(2, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "position",
INT4OID, -1, 0, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "colname",
TEXTOID, -1, 0, false);
/* allocate a slot for a tuple with this tupdesc */
slot = TupleDescGetSlot(tupdesc);
/* assign slot to function context */
funcctx->slot = slot;
/*
* Generate attribute metadata needed later to produce tuples from
* raw C strings
*/
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
/* get an array of attnums */
results = get_pkey_attnames(relid, &numatts);
if ((results != NULL) && (numatts > 0))
{
funcctx->max_calls = numatts;
/* got results, keep track of them */
funcctx->user_fctx = results;
}
else
/* fast track when no results */
SRF_RETURN_DONE(funcctx);
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
slot = funcctx->slot;
results = (char **) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
values = (char **) palloc(2 * sizeof(char *));
values[0] = (char *) palloc(12); /* sign, 10 digits, '\0' */
sprintf(values[0], "%d", call_cntr + 1);
values[1] = results[call_cntr];
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = TupleGetDatum(slot, tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
/* do when there is no more left */
SRF_RETURN_DONE(funcctx);
}
/*
* Note: dblink_last_oid is DEPRECATED;
* it *will* be removed on next release
*
* dblink_last_oid
* return last inserted oid
*/
PG_FUNCTION_INFO_V1(dblink_last_oid);
Datum
dblink_last_oid(PG_FUNCTION_ARGS)
{
dblink_results *results;
results = get_res_ptr(PG_GETARG_INT32(0));
if (results == NULL)
{
if (res_id != NIL)
{
freeList(res_id);
res_id = NIL;
res_id_index = 0;
}
elog(ERROR, "dblink_tok: function called with invalid resource id");
}
PG_RETURN_OID(PQoidValue(results->res));
}
/*
* dblink_build_sql_insert
*
* Used to generate an SQL insert statement
* based on an existing tuple in a local relation.
* This is useful for selectively replicating data
* to another server via dblink.
*
* API:
* <relname> - name of local table of interest
* <pkattnums> - an int2vector of attnums which will be used
* to identify the local tuple of interest
* <pknumatts> - number of attnums in pkattnums
* <src_pkattvals_arry> - text array of key values which will be used
* to identify the local tuple of interest
* <tgt_pkattvals_arry> - text array of key values which will be used
* to build the string for execution remotely. These are substituted
* for their counterparts in src_pkattvals_arry
*/
PG_FUNCTION_INFO_V1(dblink_build_sql_insert);
Datum
dblink_build_sql_insert(PG_FUNCTION_ARGS)
{
Oid relid;
text *relname_text;
int16 *pkattnums;
int16 pknumatts;
char **src_pkattvals;
char **tgt_pkattvals;
ArrayType *src_pkattvals_arry;
ArrayType *tgt_pkattvals_arry;
int src_ndim;
int *src_dim;
int src_nitems;
int tgt_ndim;
int *tgt_dim;
int tgt_nitems;
int i;
char *ptr;
char *sql;
text *sql_text;
int16 typlen;
bool typbyval;
char typalign;
relname_text = PG_GETARG_TEXT_P(0);
/*
* Convert relname to rel OID.
*/
relid = get_relid_from_relname(relname_text);
if (!OidIsValid(relid))
elog(ERROR, "dblink_build_sql_insert: relation does not exist");
pkattnums = (int16 *) PG_GETARG_POINTER(1);
pknumatts = PG_GETARG_INT16(2);
/*
* There should be at least one key attribute
*/
if (pknumatts == 0)
elog(ERROR, "dblink_build_sql_insert: number of key attributes must be > 0.");
src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
/*
* Source array is made up of key values that will be used to locate
* the tuple of interest from the local system.
*/
src_ndim = ARR_NDIM(src_pkattvals_arry);
src_dim = ARR_DIMS(src_pkattvals_arry);
src_nitems = ArrayGetNItems(src_ndim, src_dim);
/*
* There should be one source array key value for each key attnum
*/
if (src_nitems != pknumatts)
elog(ERROR, "dblink_build_sql_insert: source key array length does not match number of key attributes.");
/*
* get array of pointers to c-strings from the input source array
*/
Assert(ARR_ELEMTYPE(src_pkattvals_arry) == TEXTOID);
get_typlenbyvalalign(ARR_ELEMTYPE(src_pkattvals_arry),
&typlen, &typbyval, &typalign);
src_pkattvals = (char **) palloc(src_nitems * sizeof(char *));
ptr = ARR_DATA_PTR(src_pkattvals_arry);
for (i = 0; i < src_nitems; i++)
{
src_pkattvals[i] = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(ptr)));
ptr = att_addlength(ptr, typlen, PointerGetDatum(ptr));
ptr = (char *) att_align(ptr, typalign);
}
/*
* Target array is made up of key values that will be used to build
* the SQL string for use on the remote system.
*/
tgt_ndim = ARR_NDIM(tgt_pkattvals_arry);
tgt_dim = ARR_DIMS(tgt_pkattvals_arry);
tgt_nitems = ArrayGetNItems(tgt_ndim, tgt_dim);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
elog(ERROR, "dblink_build_sql_insert: target key array length does not match number of key attributes.");
/*
* get array of pointers to c-strings from the input target array
*/
Assert(ARR_ELEMTYPE(tgt_pkattvals_arry) == TEXTOID);
get_typlenbyvalalign(ARR_ELEMTYPE(tgt_pkattvals_arry),
&typlen, &typbyval, &typalign);
tgt_pkattvals = (char **) palloc(tgt_nitems * sizeof(char *));
ptr = ARR_DATA_PTR(tgt_pkattvals_arry);
for (i = 0; i < tgt_nitems; i++)
{
tgt_pkattvals[i] = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(ptr)));
ptr = att_addlength(ptr, typlen, PointerGetDatum(ptr));
ptr = (char *) att_align(ptr, typalign);
}
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_insert(relid, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
/*
* Make it into TEXT for return to the client
*/
sql_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(sql)));
/*
* And send it
*/
PG_RETURN_TEXT_P(sql_text);
}
/*
* dblink_build_sql_delete
*
* Used to generate an SQL delete statement.
* This is useful for selectively replicating a
* delete to another server via dblink.
*
* API:
* <relname> - name of remote table of interest
* <pkattnums> - an int2vector of attnums which will be used
* to identify the remote tuple of interest
* <pknumatts> - number of attnums in pkattnums
* <tgt_pkattvals_arry> - text array of key values which will be used
* to build the string for execution remotely.
*/
PG_FUNCTION_INFO_V1(dblink_build_sql_delete);
Datum
dblink_build_sql_delete(PG_FUNCTION_ARGS)
{
Oid relid;
text *relname_text;
int16 *pkattnums;
int16 pknumatts;
char **tgt_pkattvals;
ArrayType *tgt_pkattvals_arry;
int tgt_ndim;
int *tgt_dim;
int tgt_nitems;
int i;
char *ptr;
char *sql;
text *sql_text;
int16 typlen;
bool typbyval;
char typalign;
relname_text = PG_GETARG_TEXT_P(0);
/*
* Convert relname to rel OID.
*/
relid = get_relid_from_relname(relname_text);
if (!OidIsValid(relid))
elog(ERROR, "dblink_build_sql_delete: relation does not exist");
pkattnums = (int16 *) PG_GETARG_POINTER(1);
pknumatts = PG_GETARG_INT16(2);
/*
* There should be at least one key attribute
*/
if (pknumatts == 0)
elog(ERROR, "dblink_build_sql_insert: number of key attributes must be > 0.");
tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
/*
* Target array is made up of key values that will be used to build
* the SQL string for use on the remote system.
*/
tgt_ndim = ARR_NDIM(tgt_pkattvals_arry);
tgt_dim = ARR_DIMS(tgt_pkattvals_arry);
tgt_nitems = ArrayGetNItems(tgt_ndim, tgt_dim);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
elog(ERROR, "dblink_build_sql_insert: target key array length does not match number of key attributes.");
/*
* get array of pointers to c-strings from the input target array
*/
Assert(ARR_ELEMTYPE(tgt_pkattvals_arry) == TEXTOID);
get_typlenbyvalalign(ARR_ELEMTYPE(tgt_pkattvals_arry),
&typlen, &typbyval, &typalign);
tgt_pkattvals = (char **) palloc(tgt_nitems * sizeof(char *));
ptr = ARR_DATA_PTR(tgt_pkattvals_arry);
for (i = 0; i < tgt_nitems; i++)
{
tgt_pkattvals[i] = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(ptr)));
ptr = att_addlength(ptr, typlen, PointerGetDatum(ptr));
ptr = (char *) att_align(ptr, typalign);
}
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_delete(relid, pkattnums, pknumatts, tgt_pkattvals);
/*
* Make it into TEXT for return to the client
*/
sql_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(sql)));
/*
* And send it
*/
PG_RETURN_TEXT_P(sql_text);
}
/*
* dblink_build_sql_update
*
* Used to generate an SQL update statement
* based on an existing tuple in a local relation.
* This is useful for selectively replicating data
* to another server via dblink.
*
* API:
* <relname> - name of local table of interest
* <pkattnums> - an int2vector of attnums which will be used
* to identify the local tuple of interest
* <pknumatts> - number of attnums in pkattnums
* <src_pkattvals_arry> - text array of key values which will be used
* to identify the local tuple of interest
* <tgt_pkattvals_arry> - text array of key values which will be used
* to build the string for execution remotely. These are substituted
* for their counterparts in src_pkattvals_arry
*/
PG_FUNCTION_INFO_V1(dblink_build_sql_update);
Datum
dblink_build_sql_update(PG_FUNCTION_ARGS)
{
Oid relid;
text *relname_text;
int16 *pkattnums;
int16 pknumatts;
char **src_pkattvals;
char **tgt_pkattvals;
ArrayType *src_pkattvals_arry;
ArrayType *tgt_pkattvals_arry;
int src_ndim;
int *src_dim;
int src_nitems;
int tgt_ndim;
int *tgt_dim;
int tgt_nitems;
int i;
char *ptr;
char *sql;
text *sql_text;
int16 typlen;
bool typbyval;
char typalign;
relname_text = PG_GETARG_TEXT_P(0);
/*
* Convert relname to rel OID.
*/
relid = get_relid_from_relname(relname_text);
if (!OidIsValid(relid))
elog(ERROR, "dblink_build_sql_update: relation does not exist");
pkattnums = (int16 *) PG_GETARG_POINTER(1);
pknumatts = PG_GETARG_INT16(2);
/*
* There should be one source array key values for each key attnum
*/
if (pknumatts == 0)
elog(ERROR, "dblink_build_sql_insert: number of key attributes must be > 0.");
src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
/*
* Source array is made up of key values that will be used to locate
* the tuple of interest from the local system.
*/
src_ndim = ARR_NDIM(src_pkattvals_arry);
src_dim = ARR_DIMS(src_pkattvals_arry);
src_nitems = ArrayGetNItems(src_ndim, src_dim);
/*
* There should be one source array key value for each key attnum
*/
if (src_nitems != pknumatts)
elog(ERROR, "dblink_build_sql_insert: source key array length does not match number of key attributes.");
/*
* get array of pointers to c-strings from the input source array
*/
Assert(ARR_ELEMTYPE(src_pkattvals_arry) == TEXTOID);
get_typlenbyvalalign(ARR_ELEMTYPE(src_pkattvals_arry),
&typlen, &typbyval, &typalign);
src_pkattvals = (char **) palloc(src_nitems * sizeof(char *));
ptr = ARR_DATA_PTR(src_pkattvals_arry);
for (i = 0; i < src_nitems; i++)
{
src_pkattvals[i] = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(ptr)));
ptr = att_addlength(ptr, typlen, PointerGetDatum(ptr));
ptr = (char *) att_align(ptr, typalign);
}
/*
* Target array is made up of key values that will be used to build
* the SQL string for use on the remote system.
*/
tgt_ndim = ARR_NDIM(tgt_pkattvals_arry);
tgt_dim = ARR_DIMS(tgt_pkattvals_arry);
tgt_nitems = ArrayGetNItems(tgt_ndim, tgt_dim);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
elog(ERROR, "dblink_build_sql_insert: target key array length does not match number of key attributes.");
/*
* get array of pointers to c-strings from the input target array
*/
Assert(ARR_ELEMTYPE(tgt_pkattvals_arry) == TEXTOID);
get_typlenbyvalalign(ARR_ELEMTYPE(tgt_pkattvals_arry),
&typlen, &typbyval, &typalign);
tgt_pkattvals = (char **) palloc(tgt_nitems * sizeof(char *));
ptr = ARR_DATA_PTR(tgt_pkattvals_arry);
for (i = 0; i < tgt_nitems; i++)
{
tgt_pkattvals[i] = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(ptr)));
ptr = att_addlength(ptr, typlen, PointerGetDatum(ptr));
ptr = (char *) att_align(ptr, typalign);
}
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_update(relid, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
/*
* Make it into TEXT for return to the client
*/
sql_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(sql)));
/*
* And send it
*/
PG_RETURN_TEXT_P(sql_text);
}
/*
* dblink_current_query
* return the current query string
* to allow its use in (among other things)
* rewrite rules
*/
PG_FUNCTION_INFO_V1(dblink_current_query);
Datum
dblink_current_query(PG_FUNCTION_ARGS)
{
text *result_text;
result_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(debug_query_string)));
PG_RETURN_TEXT_P(result_text);
}
/*************************************************************
* internal functions
*/
/*
* init_dblink_results
* - create an empty dblink_results data structure
*/
static dblink_results *
init_dblink_results(MemoryContext fn_mcxt)
{
MemoryContext oldcontext;
dblink_results *retval;
oldcontext = MemoryContextSwitchTo(fn_mcxt);
retval = (dblink_results *) palloc(sizeof(dblink_results));
MemSet(retval, 0, sizeof(dblink_results));
retval->tup_num = -1;
retval->res_id_index = -1;
retval->res = NULL;
MemoryContextSwitchTo(oldcontext);
return retval;
}
/*
* get_pkey_attnames
*
* Get the primary key attnames for the given relation.
* Return NULL, and set numatts = 0, if no primary key exists.
*/
static char **
get_pkey_attnames(Oid relid, int16 *numatts)
{
Relation indexRelation;
ScanKeyData entry;
HeapScanDesc scan;
HeapTuple indexTuple;
int i;
char **result = NULL;
Relation rel;
TupleDesc tupdesc;
/* open relation using relid, get tupdesc */
rel = relation_open(relid, AccessShareLock);
tupdesc = rel->rd_att;
/* initialize numatts to 0 in case no primary key exists */
*numatts = 0;
/* use relid to get all related indexes */
indexRelation = heap_openr(IndexRelationName, AccessShareLock);
ScanKeyEntryInitialize(&entry, 0, Anum_pg_index_indrelid,
F_OIDEQ, ObjectIdGetDatum(relid));
scan = heap_beginscan(indexRelation, SnapshotNow, 1, &entry);
while ((indexTuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
{
Form_pg_index index = (Form_pg_index) GETSTRUCT(indexTuple);
/* we're only interested if it is the primary key */
if (index->indisprimary == TRUE)
{
i = 0;
while (index->indkey[i++] != 0)
(*numatts)++;
if (*numatts > 0)
{
result = (char **) palloc(*numatts * sizeof(char *));
for (i = 0; i < *numatts; i++)
result[i] = SPI_fname(tupdesc, index->indkey[i]);
}
break;
}
}
heap_endscan(scan);
heap_close(indexRelation, AccessShareLock);
relation_close(rel, AccessShareLock);
return result;
}
static char *
get_sql_insert(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
{
Relation rel;
char *relname;
HeapTuple tuple;
TupleDesc tupdesc;
int natts;
StringInfo str = makeStringInfo();
char *sql;
char *val;
int16 key;
int i;
bool needComma;
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
relname = RelationGetRelationName(rel);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
tuple = get_tuple_of_interest(relid, pkattnums, pknumatts, src_pkattvals);
if (!tuple)
elog(ERROR, "dblink_build_sql_insert: row not found");
appendStringInfo(str, "INSERT INTO %s(", quote_ident_cstr(relname));
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(str, ",");
appendStringInfo(str, "%s",
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
needComma = true;
}
appendStringInfo(str, ") VALUES(");
/*
* remember attvals are 1 based
*/
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(str, ",");
if (tgt_pkattvals != NULL)
key = get_attnum_pk_pos(pkattnums, pknumatts, i + 1);
else
key = -1;
if (key > -1)
val = pstrdup(tgt_pkattvals[key]);
else
val = SPI_getvalue(tuple, tupdesc, i + 1);
if (val != NULL)
{
appendStringInfo(str, "%s", quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(str, "NULL");
needComma = true;
}
appendStringInfo(str, ")");
sql = pstrdup(str->data);
pfree(str->data);
pfree(str);
relation_close(rel, AccessShareLock);
return (sql);
}
static char *
get_sql_delete(Oid relid, int16 *pkattnums, int16 pknumatts, char **tgt_pkattvals)
{
Relation rel;
char *relname;
TupleDesc tupdesc;
int natts;
StringInfo str = makeStringInfo();
char *sql;
char *val;
int i;
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
relname = RelationGetRelationName(rel);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
appendStringInfo(str, "DELETE FROM %s WHERE ", quote_ident_cstr(relname));
for (i = 0; i < pknumatts; i++)
{
int16 pkattnum = pkattnums[i];
if (i > 0)
appendStringInfo(str, " AND ");
appendStringInfo(str, "%s",
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
if (tgt_pkattvals != NULL)
val = pstrdup(tgt_pkattvals[i]);
else
{
elog(ERROR, "Target key array must not be NULL");
val = NULL; /* keep compiler quiet */
}
if (val != NULL)
{
appendStringInfo(str, " = %s", quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(str, " IS NULL");
}
sql = pstrdup(str->data);
pfree(str->data);
pfree(str);
relation_close(rel, AccessShareLock);
return (sql);
}
static char *
get_sql_update(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals)
{
Relation rel;
char *relname;
HeapTuple tuple;
TupleDesc tupdesc;
int natts;
StringInfo str = makeStringInfo();
char *sql;
char *val;
int16 key;
int i;
bool needComma;
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
relname = RelationGetRelationName(rel);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
tuple = get_tuple_of_interest(relid, pkattnums, pknumatts, src_pkattvals);
if (!tuple)
elog(ERROR, "dblink_build_sql_update: row not found");
appendStringInfo(str, "UPDATE %s SET ", quote_ident_cstr(relname));
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(str, ", ");
appendStringInfo(str, "%s = ",
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
if (tgt_pkattvals != NULL)
key = get_attnum_pk_pos(pkattnums, pknumatts, i + 1);
else
key = -1;
if (key > -1)
val = pstrdup(tgt_pkattvals[key]);
else
val = SPI_getvalue(tuple, tupdesc, i + 1);
if (val != NULL)
{
appendStringInfo(str, "%s", quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(str, "NULL");
needComma = true;
}
appendStringInfo(str, " WHERE ");
for (i = 0; i < pknumatts; i++)
{
int16 pkattnum = pkattnums[i];
if (i > 0)
appendStringInfo(str, " AND ");
appendStringInfo(str, "%s",
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
if (tgt_pkattvals != NULL)
val = pstrdup(tgt_pkattvals[i]);
else
val = SPI_getvalue(tuple, tupdesc, pkattnum);
if (val != NULL)
{
appendStringInfo(str, " = %s", quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(str, " IS NULL");
}
sql = pstrdup(str->data);
pfree(str->data);
pfree(str);
relation_close(rel, AccessShareLock);
return (sql);
}
/*
* Return a properly quoted literal value.
* Uses quote_literal in quote.c
*/
static char *
quote_literal_cstr(char *rawstr)
{
text *rawstr_text;
text *result_text;
char *result;
rawstr_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(rawstr)));
result_text = DatumGetTextP(DirectFunctionCall1(quote_literal, PointerGetDatum(rawstr_text)));
result = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(result_text)));
return result;
}
/*
* Return a properly quoted identifier.
* Uses quote_ident in quote.c
*/
static char *
quote_ident_cstr(char *rawstr)
{
text *rawstr_text;
text *result_text;
char *result;
rawstr_text = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(rawstr)));
result_text = DatumGetTextP(DirectFunctionCall1(quote_ident, PointerGetDatum(rawstr_text)));
result = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(result_text)));
return result;
}
static int16
get_attnum_pk_pos(int16 *pkattnums, int16 pknumatts, int16 key)
{
int i;
/*
* Not likely a long list anyway, so just scan for the value
*/
for (i = 0; i < pknumatts; i++)
if (key == pkattnums[i])
return i;
return -1;
}
static HeapTuple
get_tuple_of_interest(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals)
{
Relation rel;
char *relname;
TupleDesc tupdesc;
StringInfo str = makeStringInfo();
char *sql = NULL;
int ret;
HeapTuple tuple;
int i;
char *val = NULL;
/*
* Open relation using relid
*/
rel = relation_open(relid, AccessShareLock);
relname = RelationGetRelationName(rel);
tupdesc = CreateTupleDescCopy(rel->rd_att);
relation_close(rel, AccessShareLock);
/*
* Connect to SPI manager
*/
if ((ret = SPI_connect()) < 0)
elog(ERROR, "get_tuple_of_interest: SPI_connect returned %d", ret);
/*
* Build sql statement to look up tuple of interest Use src_pkattvals
* as the criteria.
*/
appendStringInfo(str, "SELECT * FROM %s WHERE ", quote_ident_cstr(relname));
for (i = 0; i < pknumatts; i++)
{
int16 pkattnum = pkattnums[i];
if (i > 0)
appendStringInfo(str, " AND ");
appendStringInfo(str, "%s",
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum - 1]->attname)));
val = pstrdup(src_pkattvals[i]);
if (val != NULL)
{
appendStringInfo(str, " = %s", quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(str, " IS NULL");
}
sql = pstrdup(str->data);
pfree(str->data);
pfree(str);
/*
* Retrieve the desired tuple
*/
ret = SPI_exec(sql, 0);
pfree(sql);
/*
* Only allow one qualifying tuple
*/
if ((ret == SPI_OK_SELECT) && (SPI_processed > 1))
elog(ERROR, "get_tuple_of_interest: Source criteria may not match more than one record.");
else if (ret == SPI_OK_SELECT && SPI_processed == 1)
{
SPITupleTable *tuptable = SPI_tuptable;
tuple = SPI_copytuple(tuptable->vals[0]);
return tuple;
}
else
{
/*
* no qualifying tuples
*/
return NULL;
}
/*
* never reached, but keep compiler quiet
*/
return NULL;
}
static Oid
get_relid_from_relname(text *relname_text)
{
RangeVar *relvar;
Relation rel;
Oid relid;
relvar = makeRangeVarFromNameList(textToQualifiedNameList(relname_text, "get_relid_from_relname"));
rel = heap_openrv(relvar, AccessShareLock);
relid = RelationGetRelid(rel);
relation_close(rel, AccessShareLock);
return relid;
}
static dblink_results *
get_res_ptr(int32 res_id_index)
{
List *ptr;
/*
* short circuit empty list
*/
if (res_id == NIL)
return NULL;
/*
* OK, should be good to go
*/
foreach(ptr, res_id)
{
dblink_results *this_res_id = (dblink_results *) lfirst(ptr);
if (this_res_id->res_id_index == res_id_index)
return this_res_id;
}
return NULL;
}
/*
* Add node to global List res_id
*/
static void
append_res_ptr(dblink_results * results)
{
//res_id = lappend(res_id, results);
res_id = lcons(results,res_id);
}
/*
* Remove node from global List
* using res_id_index
*/
static void
remove_res_ptr(dblink_results * results)
{
res_id = lremove(results, res_id);
if (res_id == NIL)
res_id_index = 0;
}
static TupleDesc
pgresultGetTupleDesc(PGresult *res)
{
int natts;
AttrNumber attnum;
TupleDesc desc;
char *attname;
int32 atttypmod;
int attdim;
bool attisset;
Oid atttypid;
int i;
/*
* allocate a new tuple descriptor
*/
natts = PQnfields(res);
if (natts < 1)
elog(ERROR, "cannot create a description for empty results");
desc = CreateTemplateTupleDesc(natts, false);
attnum = 0;
for (i = 0; i < natts; i++)
{
/*
* for each field, get the name and type information from the
* query result and have TupleDescInitEntry fill in the attribute
* information we need.
*/
attnum++;
attname = PQfname(res, i);
atttypid = PQftype(res, i);
atttypmod = PQfmod(res, i);
if (PQfsize(res, i) != get_typlen(atttypid))
elog(ERROR, "Size of remote field \"%s\" does not match size "
"of local type \"%s\"",
attname,
format_type_with_typemod(atttypid, atttypmod));
attdim = 0;
attisset = false;
TupleDescInitEntry(desc, attnum, attname, atttypid,
atttypmod, attdim, attisset);
}
return desc;
}
/*
* init_public_connections
*/
static public_pq_connections *
init_public_connections()
{
MemoryContext oldcontext;
public_pq_connections *retval;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
retval = (public_pq_connections *) palloc(sizeof(public_pq_connections));
MemSet(retval, 0, sizeof(public_pq_connections));
retval->conn_id_index = -1;
retval->conn = NULL;
MemoryContextSwitchTo(oldcontext);
return retval;
}
/*
* init_dblink_results
*/
static public_pq_results *
init_public_results()
{
MemoryContext oldcontext;
public_pq_results *retval;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
retval = (public_pq_results *) palloc(sizeof(public_pq_results));
MemSet(retval, 0, sizeof(public_pq_results));
retval->res_id_index = -1;
retval->res = NULL;
MemoryContextSwitchTo(oldcontext);
return retval;
}
/*
* get_public_conn
*/
static public_pq_connections *
get_public_conn(int32 public_conn_id_index)
{
List *ptr;
MemoryContext oldcontext;
public_pq_connections *this_public_conn_id;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
/*
* short circuit empty list
*/
if (public_conn_id== NIL){
MemoryContextSwitchTo(oldcontext);
return NULL;
}
/*
* OK, should be good to go
*/
foreach(ptr, public_conn_id)
{
this_public_conn_id = (public_pq_connections *) lfirst(ptr);
if (this_public_conn_id->conn_id_index == public_conn_id_index){
MemoryContextSwitchTo(oldcontext);
return this_public_conn_id;
}
}
MemoryContextSwitchTo(oldcontext);
return NULL;
}
/*
* get_public_conn
*/
static public_pq_results *
get_public_res(int32 public_res_id_index)
{
List *ptr;
public_pq_results *this_public_res_id;
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
/*
* short circuit empty list
*/
if (public_res_id== NIL){
MemoryContextSwitchTo(oldcontext);
return NULL;
}
/*
* OK, should be good to go
*/
foreach(ptr, public_res_id)
{
this_public_res_id = (public_pq_results *) lfirst(ptr);
if (this_public_res_id->res_id_index == public_res_id_index){
MemoryContextSwitchTo(oldcontext);
return this_public_res_id;
}
}
MemoryContextSwitchTo(oldcontext);
return NULL;
}
/*
* Add node to global List public_conn_id
*/
static void
append_public_conn(public_pq_connections * connections)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
public_conn_id = lappend(public_conn_id, connections);
MemoryContextSwitchTo(oldcontext);
}
/*
* Add node to global List public_res_id
*/
static void
append_public_res(public_pq_results* results)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
public_res_id = lappend(public_res_id, results);
MemoryContextSwitchTo(oldcontext);
}
/*
* Remove node from global List
* using public_conn_id_index
*/
static void
remove_public_conn(public_pq_connections * connections)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
public_conn_id= lremove(connections, public_conn_id);
if (public_conn_id== NIL)
public_conn_id_index = 0;
MemoryContextSwitchTo(oldcontext);
}
/*
* Remove node from global List
* using public_conn_id_index
*/
static void
remove_public_res(public_pq_results * results)
{
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
public_res_id= lremove(results, public_res_id);
if (public_res_id== NIL)
public_res_id_index = 0;
MemoryContextSwitchTo(oldcontext);
}
/*
Check connection id and return PGconn pointer, delete connection from list if removePointer = TRUE
*/
PGconn* getConnPointer(int32 nConnId,bool removePointer){
PGconn* conn;
public_pq_connections* connections;
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
connections = get_public_conn(nConnId);
if (connections == NULL){
MemoryContextSwitchTo(oldcontext);
return NULL;
}
conn = connections->conn;
if (removePointer){
remove_public_conn(connections);
pfree(connections);
}
MemoryContextSwitchTo(oldcontext);
return conn;
}
/*
Check result id and return PGresult pointer, delete result from list if removePointer = TRUE
*/
PGresult* getResultPointer(int32 nResId,bool removePointer){
PGresult* res;
public_pq_results *results;
MemoryContext oldcontext;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
results = get_public_res(nResId);
if (results == NULL){
MemoryContextSwitchTo(oldcontext);
return NULL;
}
res = results->res;
if (removePointer){
remove_public_res(results);
pfree(results);
}
MemoryContextSwitchTo(oldcontext);
return res;
}
/*
PGconn Connectdb(char *ConnectionString);
--Connect to database
*/
PG_FUNCTION_INFO_V1(dblink_pq_Connectdb);
Datum
dblink_pq_Connectdb(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
char *connString = GET_STR(PG_GETARG_TEXT_P(0));
public_pq_connections* connections;
conn = PQconnectdb(connString);
if (PQstatus(conn) != CONNECTION_BAD)
{
public_conn_id_index++;
connections = init_public_connections();
connections->conn_id_index = public_conn_id_index;
connections->conn=conn;
append_public_conn(connections);
PG_RETURN_INT32(public_conn_id_index);
}else{
PG_RETURN_INT32(0);
}
}
/*
PGconn SetdbLogin(char *host,char *port,char *options,char *tty,char *dbName,char *Login,char *Password);
--Connect to database
*/
PG_FUNCTION_INFO_V1(dblink_pq_SetdbLogin);
Datum
dblink_pq_SetdbLogin(PG_FUNCTION_ARGS)
{
PGconn *conn = NULL;
char *pghost;
char *pgport;
char *pgoptions;
char *pgtty;
char *dbName;
char *login;
char *pwd;
public_pq_connections* connections;
pghost = GET_STR(PG_GETARG_TEXT_P(0));
pgport = GET_STR(PG_GETARG_TEXT_P(1));
pgoptions = GET_STR(PG_GETARG_TEXT_P(2));
pgtty = GET_STR(PG_GETARG_TEXT_P(3));
dbName = GET_STR(PG_GETARG_TEXT_P(4));
login = GET_STR(PG_GETARG_TEXT_P(5));
pwd = GET_STR(PG_GETARG_TEXT_P(6));
if (pgport == NULL)
pgport="5432";
conn = PQsetdbLogin(pghost,pgport,pgoptions,pgtty,dbName,login,pwd);
if (PQstatus(conn) != CONNECTION_BAD)
{
public_conn_id_index++;
connections = init_public_connections();
connections->conn_id_index = public_conn_id_index;
connections->conn=conn;
append_public_conn(connections);
PG_RETURN_INT32(public_conn_id_index);
}else{
PG_RETURN_INT32(0);
}
}
/*
int Status(PGconn *Connection);
--Connection status
*/
PG_FUNCTION_INFO_V1(dblink_pq_Status);
Datum
dblink_pq_Status(PG_FUNCTION_ARGS)
{
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Status: function called with invalid connection id");
PG_RETURN_INT32(PQstatus(conn));
}
/*
text StatusStr(PGconn *Connection);
--Connection status
*/
PG_FUNCTION_INFO_V1(dblink_pq_StatusStr);
Datum
dblink_pq_StatusStr(PG_FUNCTION_ARGS)
{
text* ConStat = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_StatusStr: function called with invalid connection id");
switch( PQstatus(conn) ){
case 0 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_OK")));
break;
} case 1 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_BAD")));
break;
} case 2 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_STARTED")));
break;
} case 3 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_MADE")));
break;
} case 4 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_AWAITING_RESPONSE")));
break;
}case 5 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_AUTH_OK")));
break;
}case 6 : {
ConStat = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum("CONNECTION_SETENV")));
break;
}
}
PG_RETURN_TEXT_P(ConStat);
}
/*
int Finish(PGconn *Connection);
--Finish the connection
*/
PG_FUNCTION_INFO_V1(dblink_pq_Finish);
Datum
dblink_pq_Finish(PG_FUNCTION_ARGS)
{
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),TRUE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Finish: function called with invalid connection id");
PQfinish(conn);
PG_RETURN_INT32(0);
}
/*
int Reset(PGconn *Connection);
--Reset the connection
*/
PG_FUNCTION_INFO_V1(dblink_pq_Reset);
Datum
dblink_pq_Reset(PG_FUNCTION_ARGS)
{
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Reset: function called with invalid connection id");
PQreset(conn);
PG_RETURN_INT32(0);
}
/*
text Db(PGconn *Connection);
--Returns database name
*/
PG_FUNCTION_INFO_V1(dblink_pq_Db);
Datum
dblink_pq_Db(PG_FUNCTION_ARGS)
{
text* DbName = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Db: function called with invalid connection id");
DbName = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQdb(conn))));
PG_RETURN_TEXT_P(DbName);
}
/*
text User(PGconn *Connection);
--Returns user name
*/
PG_FUNCTION_INFO_V1(dblink_pq_User);
Datum
dblink_pq_User(PG_FUNCTION_ARGS)
{
text* User = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_User: function called with invalid connection id");
User = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQuser(conn))));
PG_RETURN_TEXT_P(User);
}
/*
text Password(PGconn *Connection);
--Returns password
*/
PG_FUNCTION_INFO_V1(dblink_pq_Password);
Datum
dblink_pq_Password(PG_FUNCTION_ARGS)
{
text* Password = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Password: function called with invalid connection id");
Password = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQpass(conn))));
PG_RETURN_TEXT_P(Password);
}
/*
text Host(PGconn *Connection);
--Returns host name
*/
PG_FUNCTION_INFO_V1(dblink_pq_Host);
Datum
dblink_pq_Host(PG_FUNCTION_ARGS)
{
text *Host = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Host: function called with invalid connection id");
Host = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQhost(conn))));
PG_RETURN_TEXT_P(Host);
}
/*
text Port(PGconn *Connection);
--Returns port
*/
PG_FUNCTION_INFO_V1(dblink_pq_Port);
Datum
dblink_pq_Port(PG_FUNCTION_ARGS)
{
text* Port = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Port: function called with invalid connection id");
Port = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQport(conn))));
PG_RETURN_TEXT_P(Port);
}
/*
text Tty(PGconn *Connection);
--Returns tty
*/
PG_FUNCTION_INFO_V1(dblink_pq_Tty);
Datum
dblink_pq_Tty(PG_FUNCTION_ARGS)
{
text* Tty = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Tty: function called with invalid connection id");
Tty = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQtty(conn))));
PG_RETURN_TEXT_P(Tty);
}
/*
text ErrorMessage(PGconn *Connection);
--Returns connection error message
*/
PG_FUNCTION_INFO_V1(dblink_pq_ErrorMessage);
Datum
dblink_pq_ErrorMessage(PG_FUNCTION_ARGS)
{
text* ErrorMsg = NULL;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_ErrorMessage: function called with invalid connection id");
ErrorMsg = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQerrorMessage(conn))));
PG_RETURN_TEXT_P(ErrorMsg);
}
/*
int BackendPID(PGconn *Connection);
--Returns backend PID of host server process
*/
PG_FUNCTION_INFO_V1(dblink_pq_BackendPID);
Datum
dblink_pq_BackendPID(PG_FUNCTION_ARGS)
{
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_BackendPID: function called with invalid connection id");
PG_RETURN_INT32(PQbackendPID(conn));
}
/*
PGresult Exec(PGconn *Connection, char *SqlExecString);
--Execute query and return pointer to PGresult
*/
PG_FUNCTION_INFO_V1(dblink_pq_Exec);
Datum
dblink_pq_Exec(PG_FUNCTION_ARGS)
{
public_pq_results* results;
PGresult* res = NULL;
char* SqlExecStr;
PGconn* conn;
conn = getConnPointer(PG_GETARG_INT32(0),FALSE);
if (conn==NULL)
elog(ERROR, "dblink_pq_Exec: function called with invalid connection id");
SqlExecStr = GET_STR(PG_GETARG_TEXT_P(1));
res= PQexec(conn,SqlExecStr);
public_res_id_index++;
results = init_public_results();
results->res_id_index = public_res_id_index;
results->res=res;
append_public_res(results);
PG_RETURN_INT32(public_res_id_index);
}
/*
int ResultStatus(PGresult *Res);
--Status of PGresult
*/
PG_FUNCTION_INFO_V1(dblink_pq_ResultStatus);
Datum
dblink_pq_ResultStatus(PG_FUNCTION_ARGS)
{
PGresult* res;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_ResultStatus: function called with invalid resource id");
PG_RETURN_INT32(PQresultStatus(res));
}
/*
text ResStatus(PGresult *Res);
--Status of PGresult as string (PGRES_COMMAND_OK for example)
*/
PG_FUNCTION_INFO_V1(dblink_pq_ResStatus);
Datum
dblink_pq_ResStatus(PG_FUNCTION_ARGS)
{
int statusFlag;
text *StatMsg;
statusFlag = PG_GETARG_INT32(0);
if (statusFlag < 0)
elog(ERROR, "dblink_pq_ResStatus: invalid status value");
StatMsg = DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQresStatus(statusFlag))));
PG_RETURN_TEXT_P(StatMsg);
}
/*
text ResultErrorMessage(PGresult *Res);
--Return PGresult error message
*/
PG_FUNCTION_INFO_V1(dblink_pq_ResultErrorMessage);
Datum
dblink_pq_ResultErrorMessage(PG_FUNCTION_ARGS)
{
text *ErrMsg;
PGresult* res;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_ResultErrorMessage: function called with invalid resource id");
ErrMsg=DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(PQresultErrorMessage(res))));
PG_RETURN_TEXT_P(ErrMsg);
}
/*
int Clear(PGresult *Res);
--Clear the PGresult
*/
PG_FUNCTION_INFO_V1(dblink_pq_Clear);
Datum
dblink_pq_Clear(PG_FUNCTION_ARGS)
{
PGresult* res;
res = getResultPointer(PG_GETARG_INT32(0),TRUE);
if (res==NULL)
elog(ERROR, "dblink_pq_ResultErrorMessage: function called with invalid resource id");
PQclear(res);
PG_RETURN_INT32(0);
}
/*
text EscapeString(char *EscapeStr);
--Escape the query string
*/
PG_FUNCTION_INFO_V1(dblink_pq_EscapeString);
Datum
dblink_pq_EscapeString(PG_FUNCTION_ARGS)
{
char* InputStr;
char* OutputStr;
size_t InputLen;
size_t OutputLen;
InputStr = GET_STR(PG_GETARG_TEXT_P(0));
InputLen=strlen(InputStr);
if(InputStr==NULL){
PG_RETURN_NULL();
}
OutputStr=(char*)palloc((2*InputLen)+1);
OutputLen=PQescapeString (OutputStr, InputStr, InputLen);
PG_RETURN_TEXT_P( DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(OutputStr))) );
}
/*
int Ntuples(PGresult *Res);
--Return number of tuples in PGresult
*/
PG_FUNCTION_INFO_V1(dblink_pq_Ntuples);
Datum
dblink_pq_Ntuples(PG_FUNCTION_ARGS)
{
PGresult* res;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Ntuples: function called with invalid resource id");
PG_RETURN_INT32(PQntuples(res));
}
/*
int Nfields(PGresult *Res);
--Return number of fields(columns) in PGresult
*/
PG_FUNCTION_INFO_V1(dblink_pq_Nfields);
Datum
dblink_pq_Nfields(PG_FUNCTION_ARGS)
{
PGresult* res;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Nfields: function called with invalid resource id");
PG_RETURN_INT32(PQnfields(res));
}
/*
text Fname(PGresult *Res, int FieldNumber);
--Return field(column) name for given column index
*/
PG_FUNCTION_INFO_V1(dblink_pq_Fname);
Datum
dblink_pq_Fname(PG_FUNCTION_ARGS)
{
int FieldNumber;
char *FieldName;
PGresult* res;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Fname: function called with invalid resource id");
FieldNumber = PG_GETARG_INT32(1);
if (FieldNumber > (PQnfields(res) - 1))
PG_RETURN_NULL();
FieldName=PQfname(res,FieldNumber);
PG_RETURN_TEXT_P( DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(FieldName))) );
}
/*
text Fnumber(PGresult *Res, char *FieldName);
--Return field(column) number for given column name
*/
PG_FUNCTION_INFO_V1(dblink_pq_Fnumber);
Datum
dblink_pq_Fnumber(PG_FUNCTION_ARGS)
{
char *FieldName;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Fnumber: function called with invalid resource id");
FieldName = DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(PG_GETARG_TEXT_P(1))));
PG_RETURN_INT32(PQfnumber(res,FieldName));
}
/*
oid Ftype(PGresult *Res, int FieldNumber);
--Return oid of data type for given field(column) number
*/
PG_FUNCTION_INFO_V1(dblink_pq_Ftype);
Datum
dblink_pq_Ftype(PG_FUNCTION_ARGS)
{
int FieldNumber;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Ftype: function called with invalid resource id");
FieldNumber = PG_GETARG_INT32(1);
if (FieldNumber > (PQnfields(res) - 1))
PG_RETURN_NULL();
PG_RETURN_OID(PQftype(res,FieldNumber));
}
/*
int Fmod(PGresult *Res, int FieldNumber);
--Return type-specific modificaton data for given field(column) number
*/
PG_FUNCTION_INFO_V1(dblink_pq_Fmod);
Datum
dblink_pq_Fmod(PG_FUNCTION_ARGS)
{
int FieldNumber;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Fmod: function called with invalid resource id");
FieldNumber = PG_GETARG_INT32(1);
if (FieldNumber > (PQnfields(res) - 1))
PG_RETURN_NULL();
PG_RETURN_INT32(PQfmod(res,FieldNumber));
}
/*
int Fsize(PGresult *Res, int FieldNumber);
--Return the size in bytes of the field
*/
PG_FUNCTION_INFO_V1(dblink_pq_Fsize);
Datum
dblink_pq_Fsize(PG_FUNCTION_ARGS)
{
int FieldNumber;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Fsize: function called with invalid resource id");
FieldNumber = PG_GETARG_INT32(1);
if (FieldNumber > (PQnfields(res) - 1))
PG_RETURN_NULL();
PG_RETURN_INT32(PQfsize(res,FieldNumber));
}
/*
int BinaryTuples(PGresult *Res);
--Return 1 if PGresult have binary tuples, 0 if not
*/
PG_FUNCTION_INFO_V1(dblink_pq_BinaryTuples);
Datum
dblink_pq_BinaryTuples(PG_FUNCTION_ARGS)
{
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_BinaryTuples: function called with invalid resource id");
PG_RETURN_INT32(PQbinaryTuples(res));
}
/*
text GetValue(PGresult *Res, int TupleNumber, int FieldNumber);
--Return value of field
*/
PG_FUNCTION_INFO_V1(dblink_pq_GetValue);
Datum
dblink_pq_GetValue(PG_FUNCTION_ARGS)
{
int TupleNumber=0;
int FieldNumber=0;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_GetValue: function called with invalid resource id");
TupleNumber = PG_GETARG_INT32(1);
if ( (TupleNumber<0) || (FieldNumber > (PQntuples(res) - 1)) )
elog(ERROR, "PlPq: invalid tuple number: %i",TupleNumber);
FieldNumber = PG_GETARG_INT32(2);
if (FieldNumber > (PQnfields(res) - 1))
elog(ERROR, "PlPq: invalid field number: %i",FieldNumber);
if (PQgetisnull(res,TupleNumber,FieldNumber)==1){
/*Return NULL*/
PG_RETURN_NULL();
}else{
/*Return text*/
PG_RETURN_TEXT_P( DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum( PQgetvalue(res,TupleNumber,FieldNumber) ))) );
}
}
/*
int Getisnull(PGresult *Res, int TupleNumber, int FieldNumber);
--Return 1 if field has no value(NULL), 0 if not
*/
PG_FUNCTION_INFO_V1(dblink_pq_Getisnull);
Datum
dblink_pq_Getisnull(PG_FUNCTION_ARGS)
{
int TupleNumber=0;
int FieldNumber=0;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Getisnull: function called with invalid resource id");
TupleNumber = PG_GETARG_INT32(1);
if ( (TupleNumber<0) || (FieldNumber > (PQntuples(res) - 1)) )
elog(ERROR, "PlPq: invalid tuple number: %i",TupleNumber);
FieldNumber = PG_GETARG_INT32(2);
if (FieldNumber > (PQnfields(res) - 1))
elog(ERROR, "PlPq: invalid field number: %i",FieldNumber);
PG_RETURN_INT32(PQgetisnull(res,TupleNumber,FieldNumber));
}
/*
int Getlength(PGresult *Res, int TupleNumber, int FieldNumber);
--Return actual size of field
*/
PG_FUNCTION_INFO_V1(dblink_pq_Getlength);
Datum
dblink_pq_Getlength(PG_FUNCTION_ARGS)
{
int TupleNumber=0;
int FieldNumber=0;
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_Getlength: function called with invalid resource id");
TupleNumber = PG_GETARG_INT32(1);
if ( (TupleNumber<0) || (FieldNumber > (PQntuples(res) - 1)) )
elog(ERROR, "PlPq: invalid tuple number: %i",TupleNumber);
FieldNumber = PG_GETARG_INT32(2);
if (FieldNumber > (PQnfields(res) - 1))
elog(ERROR, "PlPq: invalid field number: %i",FieldNumber);
PG_RETURN_INT32(PQgetlength(res,TupleNumber,FieldNumber));
}
/*
text CmdStatus(PGresult *Res);
--Return command status string from PGresult
*/
PG_FUNCTION_INFO_V1(dblink_pq_CmdStatus);
Datum
dblink_pq_CmdStatus(PG_FUNCTION_ARGS)
{
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_CmdStatus: function called with invalid resource id");
PG_RETURN_TEXT_P( DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum( PQcmdStatus(res) ))) );
}
/*
int CmdTuples(PGresult *Res);
--Return number of rows affected by the SQL command
*/
PG_FUNCTION_INFO_V1(dblink_pq_CmdTuples);
Datum
dblink_pq_CmdTuples(PG_FUNCTION_ARGS)
{
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_CmdTuples: function called with invalid resource id");
PG_RETURN_INT32(atoi(PQcmdTuples(res)));
}
/*
oid OidValue(PGresult *Res);
--Return last inserted OID
*/
PG_FUNCTION_INFO_V1(dblink_pq_OidValue);
Datum
dblink_pq_OidValue(PG_FUNCTION_ARGS)
{
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_OidValue: function called with invalid resource id");
PG_RETURN_OID(PQoidValue(res));
}
/*
text OidStatus(PGresult *Res);
--Return OID status as string
*/
PG_FUNCTION_INFO_V1(dblink_pq_OidStatus);
Datum
dblink_pq_OidStatus(PG_FUNCTION_ARGS)
{
PGresult *res = NULL;
res = getResultPointer(PG_GETARG_INT32(0),FALSE);
if (res==NULL)
elog(ERROR, "dblink_pq_OidStatus: function called with invalid resource id");
PG_RETURN_TEXT_P( DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum( PQoidStatus(res) ))) );
}
--QUERY:
----------------------------------------------------------------------------------
--Add connection (id 1)
SELECT PQConnectdb('host=lisa.finteh.hr dbname=template1 user=finteh');
--Add connection (id 2)
SELECT PQsetdbLogin('lisa.finteh.hr','5432', '', '','template1','finteh','');
--Try to add invalid connection - must return 0
SELECT PQsetdbLogin('lisa.finteh.hr','5432', '', '','template11','finteh','');
--Status of connections 1 i 2
SELECT PQStatus(1);
SELECT PQStatus(2);
SELECT PQStatusStr(1);
SELECT PQStatusStr(2);
--Status of invalid connection id must result with an error
SELECT PQStatusStr(10000);
--Reset the connection 2 and check if ok
SELECT PQReset(2);
SELECT PQStatusStr(2);
--Finish connection 2 - it must be closed and any call with this id must result with
an error
SELECT PQFinish(2);
SELECT PQStatusStr(2);
--Some information about connection 1
SELECT PQdb (1);
SELECT PQuser (1);
SELECT PQpass (1);
SELECT PQhost (1);
SELECT PQport (1);
SELECT PQtty (1);
SELECT PQerrorMessage(1);
SELECT PQbackendPID (1);
--Create result id 1 and id 2
SELECT PQExec(1,'SELECT * FROM pg_database;');
SELECT PQExec(1,'SELECT * FROM pg_class;');
--Status of result id 1 and id 2
SELECT PQresStatus(PQresultStatus(1));
SELECT PQresStatus(PQresultStatus(2));
SELECT PQresultErrorMessage(1);
--Create bogus result (try to get error information)
SELECT PQExec(1,'SELECT * FROM pg_classXXX;');
SELECT PQresStatus(PQresultStatus(3));
SELECT PQresultErrorMessage(3);
--Now try to clear result 3, and get error information - must raise an error
SELECT PQClear(3);
SELECT PQresultErrorMessage(3);
--Escape string test
SELECT '\\' as original;
SELECT PQescapeString('\\') as escaped;
--Now try to get information about result id 1
SELECT PQntuples(1);
SELECT PQnfields(1);
SELECT PQfname(1,0);
SELECT PQfname(1,1);
SELECT PQfnumber(1,'datdba');
SELECT PQfnumber(1,'datname');
SELECT PQftype(1,0);
SELECT PQfsize(1,0);
SELECT PQfmod(1,0);
SELECT PQBinaryTuples(1);
SELECT PQgetvalue(1,0,0);
SELECT PQgetvalue(1,0,1);
SELECT PQgetisnull(1,0,0);
SELECt PQgetlength(1,0,0);
SELECT PQcmdStatus(1);
SELECT PQcmdTuples(1);
SELECT PQoidValue(1);
SELECT PQoidStatus(1);
--Now try to get information about invalid result
SELECT PQntuples(3);
SELECT PQnfields(3);
SELECT PQfname(3,0);
SELECT PQfname(3,1);
SELECT PQfnumber(3,'datdba');
SELECT PQfnumber(3,'datname');
SELECT PQftype(3,0);
SELECT PQfsize(3,0);
SELECT PQfmod(3,0);
SELECT PQBinaryTuples(3);
SELECT PQgetvalue(3,0,0);
SELECT PQgetvalue(3,0,1);
SELECT PQgetisnull(3,0,0);
SELECt PQgetlength(3,0,0);
SELECT PQcmdStatus(3);
SELECT PQcmdTuples(3);
SELECT PQoidValue(3);
SELECT PQoidStatus(3);
--RESULTS:
----------------------------------------------------------------------------------
pqconnectdb
-------------
1
(1 row)
pqsetdblogin
--------------
2
(1 row)
pqsetdblogin
--------------
0
(1 row)
pqstatus
----------
0
(1 row)
pqstatus
----------
0
(1 row)
pqstatusstr
---------------
CONNECTION_OK
(1 row)
pqstatusstr
---------------
CONNECTION_OK
(1 row)
psql:/tmp/200210232134410:15: ERROR: dblink_pq_StatusStr: function called with
invalid connection id
pqreset
---------
0
(1 row)
pqstatusstr
---------------
CONNECTION_OK
(1 row)
pqfinish
----------
0
(1 row)
pqdb
-----------
template1
(1 row)
pquser
--------
finteh
(1 row)
pqpass
--------
(1 row)
psql:/tmp/200210232134410:23: ERROR: dblink_pq_StatusStr: function called with
invalid connection id
pqhost
----------------
lisa.finteh.hr
(1 row)
pqport
--------
5432
(1 row)
pqtty
-------
(1 row)
pqerrormessage
----------------
(1 row)
pqbackendpid
--------------
10976
(1 row)
pqexec
--------
1
(1 row)
pqexec
--------
2
(1 row)
pqresstatus
-----------------
PGRES_TUPLES_OK
(1 row)
pqresstatus
-----------------
PGRES_TUPLES_OK
(1 row)
pqresulterrormessage
----------------------
(1 row)
pqexec
--------
3
(1 row)
pqresstatus
-------------------
PGRES_FATAL_ERROR
(1 row)
pqresulterrormessage
------------------------------------------------
ERROR: Relation "pg_classxxx" does not exist
(1 row)
pqclear
---------
0
(1 row)
psql:/tmp/200210232134410:50: ERROR: dblink_pq_ResultErrorMessage: function called
with invalid resource id
original
----------
\
(1 row)
escaped
---------
\\
(1 row)
pqntuples
-----------
6
(1 row)
pqnfields
-----------
11
(1 row)
pqfname
---------
datname
(1 row)
pqfname
---------
datdba
(1 row)
pqfnumber
-----------
1
(1 row)
pqfnumber
-----------
0
(1 row)
pqftype
---------
19
(1 row)
pqfsize
---------
64
(1 row)
pqfmod
--------
-1
(1 row)
pqbinarytuples
----------------
0
(1 row)
pqgetvalue
-------------
app_setings
(1 row)
pqgetvalue
------------
100
(1 row)
pqgetisnull
-------------
0
(1 row)
pqgetlength
-------------
11
(1 row)
pqcmdstatus
-------------
SELECT
(1 row)
pqcmdtuples
-------------
0
(1 row)
pqoidvalue
------------
0
(1 row)
pqoidstatus
-------------
(1 row)
psql:/tmp/200210232134410:77: ERROR: dblink_pq_Ntuples: function called with invalid
resource id
psql:/tmp/200210232134410:78: ERROR: dblink_pq_Nfields: function called with invalid
resource id
psql:/tmp/200210232134410:79: ERROR: dblink_pq_Fname: function called with invalid
resource id
psql:/tmp/200210232134410:80: ERROR: dblink_pq_Fname: function called with invalid
resource id
psql:/tmp/200210232134410:81: ERROR: dblink_pq_Fnumber: function called with invalid
resource id
psql:/tmp/200210232134410:82: ERROR: dblink_pq_Fnumber: function called with invalid
resource id
psql:/tmp/200210232134410:83: ERROR: dblink_pq_Ftype: function called with invalid
resource id
psql:/tmp/200210232134410:84: ERROR: dblink_pq_Fsize: function called with invalid
resource id
psql:/tmp/200210232134410:85: ERROR: dblink_pq_Fmod: function called with invalid
resource id
psql:/tmp/200210232134410:86: ERROR: dblink_pq_BinaryTuples: function called with
invalid resource id
psql:/tmp/200210232134410:87: ERROR: dblink_pq_GetValue: function called with invalid
resource id
psql:/tmp/200210232134410:88: ERROR: dblink_pq_GetValue: function called with invalid
resource id
psql:/tmp/200210232134410:89: ERROR: dblink_pq_Getisnull: function called with
invalid resource id
psql:/tmp/200210232134410:90: ERROR: dblink_pq_Getlength: function called with
invalid resource id
psql:/tmp/200210232134410:91: ERROR: dblink_pq_CmdStatus: function called with
invalid resource id
psql:/tmp/200210232134410:92: ERROR: dblink_pq_CmdTuples: function called with
invalid resource id
psql:/tmp/200210232134410:93: ERROR: dblink_pq_OidValue: function called with invalid
resource id
psql:/tmp/200210232134410:94: ERROR: dblink_pq_OidStatus: function called with
invalid resource id
-- Uncomment the following 9 lines to use original DEPRECATED functions
--CREATE OR REPLACE FUNCTION dblink (text,text) RETURNS setof int
-- AS 'MODULE_PATHNAME','dblink' LANGUAGE 'c'
-- WITH (isstrict);
--CREATE OR REPLACE FUNCTION dblink_tok (int,int) RETURNS text
-- AS 'MODULE_PATHNAME','dblink_tok' LANGUAGE 'c'
-- WITH (isstrict);
--CREATE OR REPLACE FUNCTION dblink_last_oid (int) RETURNS oid
-- AS 'MODULE_PATHNAME','dblink_last_oid' LANGUAGE 'c'
-- WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_connect (text) RETURNS text
AS 'MODULE_PATHNAME','dblink_connect' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_disconnect () RETURNS text
AS 'MODULE_PATHNAME','dblink_disconnect' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_open (text,text) RETURNS text
AS 'MODULE_PATHNAME','dblink_open' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_fetch (text,int) RETURNS setof record
AS 'MODULE_PATHNAME','dblink_fetch' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_close (text) RETURNS text
AS 'MODULE_PATHNAME','dblink_close' LANGUAGE 'c'
WITH (isstrict);
-- Note: if this is a first time install of dblink, the following DROP
-- FUNCTION line is expected to fail.
-- Comment out the following 4 lines if the DEPRECATED functions are used.
DROP FUNCTION dblink (text,text);
CREATE OR REPLACE FUNCTION dblink (text,text) RETURNS setof record
AS 'MODULE_PATHNAME','dblink_record' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink (text) RETURNS setof record
AS 'MODULE_PATHNAME','dblink_record' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_exec (text,text) RETURNS text
AS 'MODULE_PATHNAME','dblink_exec' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_exec (text) RETURNS text
AS 'MODULE_PATHNAME','dblink_exec' LANGUAGE 'c'
WITH (isstrict);
CREATE TYPE dblink_pkey_results AS (position int4, colname text);
CREATE OR REPLACE FUNCTION dblink_get_pkey (text) RETURNS setof dblink_pkey_results
AS 'MODULE_PATHNAME','dblink_get_pkey' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_build_sql_insert (text, int2vector, int2, _text,
_text) RETURNS text
AS 'MODULE_PATHNAME','dblink_build_sql_insert' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_build_sql_delete (text, int2vector, int2, _text)
RETURNS text
AS 'MODULE_PATHNAME','dblink_build_sql_delete' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_build_sql_update (text, int2vector, int2, _text,
_text) RETURNS text
AS 'MODULE_PATHNAME','dblink_build_sql_update' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION dblink_current_query () RETURNS text
AS 'MODULE_PATHNAME','dblink_current_query' LANGUAGE 'c';
-- ******************************************************************************
CREATE OR REPLACE FUNCTION PQconnectdb (text) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Connectdb' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQsetdbLogin (text,text,text,text,text,text,text) RETURNS
int
AS 'MODULE_PATHNAME','dblink_pq_SetdbLogin' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQfinish (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Finish' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQreset (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Reset' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQstatus (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Status' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQstatusStr (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_StatusStr' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQdb (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_Db' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQuser (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_User' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQpass (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_Password' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQhost (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_Host' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQport (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_Port' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQtty (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_Tty' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQerrorMessage (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_ErrorMessage' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQbackendPID (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_BackendPID' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQexec (int,text) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Exec' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQresultStatus (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_ResultStatus' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQresStatus (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_ResStatus' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQresultErrorMessage (int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_ResultErrorMessage' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQclear (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Clear' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQescapeString (text) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_EscapeString' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQntuples (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Ntuples' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQnfields (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Nfields' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQfname (int,int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_Fname' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQfnumber (int,text) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Fnumber' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQftype (int,int) RETURNS oid
AS 'MODULE_PATHNAME','dblink_pq_Ftype' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQfmod (int,int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Fmod' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQfsize (int,int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Fsize' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQBinaryTuples (int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_BinaryTuples' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQgetvalue(int,int,int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_GetValue' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQgetisnull(int,int,int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Getisnull' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQgetlength(int,int,int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_Getlength' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQcmdStatus(int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_CmdStatus' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQcmdTuples(int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_CmdTuples' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQoidValue(int) RETURNS int
AS 'MODULE_PATHNAME','dblink_pq_OidValue' LANGUAGE 'c'
WITH (isstrict);
CREATE OR REPLACE FUNCTION PQoidStatus(int) RETURNS text
AS 'MODULE_PATHNAME','dblink_pq_OidStatus' LANGUAGE 'c'
WITH (isstrict);
/*
* dblink.h
*
* Functions returning results from a remote database
*
* Joe Conway <[EMAIL PROTECTED]>
*
* Copyright (c) 2001, 2002 by PostgreSQL Global Development Group
* ALL RIGHTS RESERVED;
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written agreement
* is hereby granted, provided that the above copyright notice and this
* paragraph and the following two paragraphs appear in all copies.
*
* IN NO EVENT SHALL THE AUTHOR OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
* DOCUMENTATION, EVEN IF THE AUTHOR OR DISTRIBUTORS HAVE BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHOR AND DISTRIBUTORS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE AUTHOR AND DISTRIBUTORS HAS NO OBLIGATIONS TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
*/
#ifndef DBLINK_H
#define DBLINK_H
/*
* This struct holds the results of the remote query.
* Use fn_extra to hold a pointer to it across calls
*/
typedef struct
{
/*
* last tuple number accessed
*/
int tup_num;
/*
* resource index number for this context
*/
int res_id_index;
/*
* the actual query results
*/
PGresult *res;
} dblink_results;
/*
* This struct information about public connections
*/
typedef struct
{
/*
* resource index number for this context
*/
int conn_id_index;
/*
* the actual connection pointer
*/
PGconn *conn;
} public_pq_connections;
typedef struct
{
/*
* resource index number for this context
*/
int res_id_index;
/*
* the actual query results
*/
PGresult *res;
} public_pq_results;
/*
* External declarations
*/
/* deprecated */
extern Datum dblink(PG_FUNCTION_ARGS);
extern Datum dblink_tok(PG_FUNCTION_ARGS);
/* supported */
extern Datum dblink_connect(PG_FUNCTION_ARGS);
extern Datum dblink_disconnect(PG_FUNCTION_ARGS);
extern Datum dblink_open(PG_FUNCTION_ARGS);
extern Datum dblink_close(PG_FUNCTION_ARGS);
extern Datum dblink_fetch(PG_FUNCTION_ARGS);
extern Datum dblink_record(PG_FUNCTION_ARGS);
extern Datum dblink_exec(PG_FUNCTION_ARGS);
extern Datum dblink_get_pkey(PG_FUNCTION_ARGS);
extern Datum dblink_last_oid(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_insert(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_delete(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_update(PG_FUNCTION_ARGS);
extern Datum dblink_current_query(PG_FUNCTION_ARGS);
extern char *debug_query_string;
extern Datum dblink_pq_Connectdb(PG_FUNCTION_ARGS);
extern Datum dblink_pq_SetdbLogin(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Status(PG_FUNCTION_ARGS);
extern Datum dblink_pq_StatusStr(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Finish(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Reset(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Db(PG_FUNCTION_ARGS);
extern Datum dblink_pq_User(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Password(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Host(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Port(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Tty(PG_FUNCTION_ARGS);
extern Datum dblink_pq_ErrorMessage(PG_FUNCTION_ARGS);
extern Datum dblink_pq_BackendPID(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Exec(PG_FUNCTION_ARGS);
extern Datum dblink_pq_ResultStatus(PG_FUNCTION_ARGS);
extern Datum dblink_pq_ResStatus(PG_FUNCTION_ARGS);
extern Datum dblink_pq_ResultErrorMessage(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Clear(PG_FUNCTION_ARGS);
extern Datum dblink_pq_EscapeString(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Ntuples(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Nfields(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Fname(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Fnumber(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Ftype(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Fmod(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Fsize(PG_FUNCTION_ARGS);
extern Datum dblink_pq_BinaryTuples(PG_FUNCTION_ARGS);
extern Datum dblink_pq_GetValue(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Getisnull(PG_FUNCTION_ARGS);
extern Datum dblink_pq_Getlength(PG_FUNCTION_ARGS);
extern Datum dblink_pq_CmdStatus(PG_FUNCTION_ARGS);
extern Datum dblink_pq_CmdTuples(PG_FUNCTION_ARGS);
extern Datum dblink_pq_OidValue(PG_FUNCTION_ARGS);
extern Datum dblink_pq_OidStatus(PG_FUNCTION_ARGS);
#endif /* DBLINK_H */
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