ID: 8346
Updated by: derick
Reported By: [EMAIL PROTECTED]
Old-Status: Feedback
Status: Suspended
Bug Type: ODBC related
Operating system:
PHP Version: 4.0.3pl1
Assigned To:
Comments:
No feedback
Previous Comments:
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[2001-06-11 10:14:15] [EMAIL PROTECTED]
this patch is a really bad idea.
hopefully i'll have a better solution for you in the near future... i'm awaiting patch
confirmation from some others before commiting it.
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[2000-12-21 03:09:55] [EMAIL PROTECTED]
The change above have effect of disabling scrolling through lists. However retriving
one record is not a problem.
Here's the script which demonstrates the bug:
<?
$myTable = "xxx";
$myDSN = odbc_connect("xxx", "xxx", "xxx");
for ($i = 0; $i < 100; $i++)
{
for ($j = 0; $j < 10; $j++)
{
$myST = odbc_exec($myDSN, "SELECT * FROM $myTable WHERE 0=1");
$n = odbc_num_fields($myST);
for ($i = 1; $i <= $n; $i++)
odbc_field_name($myST, $i);
odbc_free_result($myST);
}
}
?>
Output as follows:
<after a pause...>
test.php(9) : Warning - SQL error: [IBM][CLI Driver][DB2/6000] SQL0954C Not enough
storage is available in the application h
eap to process the statement. SQLSTATE=57011
, SQL state 57011 in SQLExecDirect
test.php(11) : Warning - Supplied argument is not a valid ODBC result resource
test.php(15) : Warning - Supplied argument is not a valid ODBC result resource
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[2000-12-21 01:48:35] [EMAIL PROTECTED]
When you execute a php script which uses odbc_exec for more than 946 times (milage may
vary), the following error message is returned:
Warning - SQL error: [IBM][CLI Driver][DB2/6000] SQL0954C Not enough storage is
available in the application heap to process the statement. SQLSTATE=57011
The following information is discovered in IBM DB2 CLI manual:
SQL_ATTR_CURSOR_TYPE (DB2 CLI v2)
A 32-bit integer value that specifies the cursor type. The supported values are:
SQL_CURSOR_FORWARD_ONLY = The cursor only scrolls forward.
SQL_CURSOR_STATIC = The data in the result set is static. This is the default.
SQL_CURSOR_KEYSET_DRIVEN = DB2 CLI supports a pure keyset cursor. The SQL_KEYSET_SIZE
statement attribute is ignored. To limit the size of the keyset the application must
limit the size of the result set by setting the SQL_ATTR_MAX_ROWS attribute to a value
other than 0.
This option cannot be specified for an open cursor.
If the specified cursor type is not supported by the data source, CLI substitutes a
different cursor type and returns SQLSTATE 01S02 (Option value changed). For a mixed
or dynamic cursor, CLI substitutes, in order, a keyset-driven or static cursor.
Note: The following value has also been defined by ODBC, but is not supported by DB2
CLI:
SQL_CURSOR_DYNAMIC
If this values is used, DB2 CLI sets the statement attribute to SQL_CURSOR_STATIC
SQL_CURSOR_FORWARD_ONLY and returns SQLSTATE 01S02 (Option value changed). In this
case the application should call SQLGetStmtAttr() to query the actual value.
The quick work around is to edit ext/odbc/php_odbc.c, and disable SQL_CURSOR_DYNAMIC,
and to change all instances of SQL_CURSOR_DYNAMIC to SQL_CURSOR_FORWARD_ONLY. It
appear that DB2/CLI exhibits memory leak when statement type is set to
SQL_CURSOR_DYNAMIC.
The diff follows:
--- php_odbc.c.orig Thu Dec 21 00:44:49 2000
+++ php_odbc.c Thu Dec 21 01:00:30 2000
@@ -354,7 +354,9 @@
REGISTER_LONG_CONSTANT("SQL_CURSOR_TYPE", SQL_CURSOR_TYPE, CONST_PERSISTENT |
CONST_CS);
REGISTER_LONG_CONSTANT("SQL_CURSOR_FORWARD_ONLY", SQL_CURSOR_FORWARD_ONLY,
CONST_PERSISTENT | CO
NST_CS);
REGISTER_LONG_CONSTANT("SQL_CURSOR_KEYSET_DRIVEN", SQL_CURSOR_KEYSET_DRIVEN,
CONST_PERSISTENT |
CONST_CS);
+#ifndef HAVE_IBMDB2
REGISTER_LONG_CONSTANT("SQL_CURSOR_DYNAMIC", SQL_CURSOR_DYNAMIC,
CONST_PERSISTENT | CONST_CS);
+#endif
REGISTER_LONG_CONSTANT("SQL_CURSOR_STATIC", SQL_CURSOR_STATIC,
CONST_PERSISTENT | CONST_CS);
REGISTER_LONG_CONSTANT("SQL_KEYSET_SIZE", SQL_KEYSET_SIZE, CONST_PERSISTENT |
CONST_CS);
@@ -758,7 +760,11 @@
/* Try to set CURSOR_TYPE to dynamic. Driver will replace this
with other
type if not possible.
*/
+#ifdef HAVE_IBMDB2
+ if (SQLSetStmtOption(result->stmt, SQL_CURSOR_TYPE,
+SQL_CURSOR_FORWARD_ONLY)
+#else
if (SQLSetStmtOption(result->stmt, SQL_CURSOR_TYPE,
SQL_CURSOR_DYNAMIC)
+#endif
== SQL_ERROR) {
odbc_sql_error(conn->henv, conn->hdbc, result->stmt, "
SQLSetStmtOption"
);
SQLFreeStmt(result->stmt, SQL_DROP);
@@ -1085,7 +1091,11 @@
/* Try to set CURSOR_TYPE to dynamic. Driver will replace this
with other
type if not possible.
*/
+#ifdef HAVE_IBMDB2
+ if (SQLSetStmtOption(result->stmt, SQL_CURSOR_TYPE,
+SQL_CURSOR_FORWARD_ONLY)
+#else
if (SQLSetStmtOption(result->stmt, SQL_CURSOR_TYPE,
SQL_CURSOR_DYNAMIC)
+#endif
== SQL_ERROR) {
odbc_sql_error(conn->henv, conn->hdbc, result->stmt, "
SQLSetStmtOption"
);
SQLFreeStmt(result->stmt, SQL_DROP);
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