Along with the sortprds code and database I sent out previously this now works.
gcc -g -o main main.c -DSQLITE_ENABLE_LOAD_EXTENSION sqlite3.c -lpthread -ldl
./main test.db "select id,sortprds(prdtype) from a order by sortprds(prdtype)"
ID = 2
sortprds(prdtype) = 3| 10| 15| 27
ID = 2
sortprds(prdtype) = 6| 8| 22
ID = 1
sortprds(prdtype) = 15
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sqlite3.h"
static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
int i;
for(i=0; i<argc; i++) {
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
return 0;
}
int main(int argc, char **argv) {
sqlite3 *db;
char *zErrMsg = 0;
int rc;
if( argc!=3 ) {
fprintf(stderr, "Usage: %s DATABASE SQL-STATEMENT\n", argv[0]);
return(1);
}
rc = sqlite3_open(argv[1], &db);
if( rc ) {
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
return(1);
}
rc = sqlite3_exec(db, "select load_extension('./sortprds.sqlext')", NULL, 0,
&zErrMsg);
if( rc!=SQLITE_OK ) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
rc = sqlite3_exec(db, argv[2], callback, 0, &zErrMsg);
if( rc!=SQLITE_OK ) {
fprintf(stderr, "SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
}
sqlite3_close(db);
return 0;
}
Michael D. Black
Senior Scientist
Advanced Analytics Directorate
Advanced GEOINT Solutions Operating Unit
Northrop Grumman Information Systems
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