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#include <stdio.h>
#include <stdlib.h>
#include "common.h"
/*
* This test case tests that things still work when you have a lot of
* statements open simultaneously.
*
* As of writing this, there's an internal limit of just below 2^15 stmt
* handles. Also, unixodbc's method of checking if a handle is valid, by
* scanning a linked list of statements, grinds to a halt as you have
* a lot of statements. If you want to test those limits, increase
* NUM_STMT_HANDLES value.
*/
#define NUM_STMT_HANDLES 100
#define MAX_QUERY_SIZE 100
int main(int argc, char **argv)
{
HSTMT hstmt[NUM_STMT_HANDLES];
SQLRETURN rc;
int i, nhandles;
char *sqlbufs[NUM_STMT_HANDLES];
test_connect();
/* Allocate a lot of stmt handles */
for (i = 0; i < NUM_STMT_HANDLES; i++)
{
rc = SQLAllocHandle(SQL_HANDLE_STMT, conn, &hstmt[i]);
if (!SQL_SUCCEEDED(rc))
{
printf("failed to allocate stmt handle %d\n", i + 1);
print_diag(NULL, SQL_HANDLE_DBC, conn);
break;
}
if ((i + 1) % (NUM_STMT_HANDLES / 10) == 0)
{
printf("%d statements allocated...\n", i + 1);
fflush(stdout);
}
/* allocate some space to hold the query */
sqlbufs[i] = malloc(MAX_QUERY_SIZE);
}
nhandles = i;
/* Execute a query using each of them to verify they all work */
for (i = 0; i < nhandles; i++)
{
sprintf(sqlbufs[i], "SELECT 'stmt no %d'", i + 1);
rc = SQLExecDirect(hstmt[i], (SQLCHAR *) sqlbufs[i], SQL_NTS);
if (!SQL_SUCCEEDED(rc))
{
print_diag("SQLExecDirect failed", SQL_HANDLE_STMT, hstmt);
exit(1);
}
if ((i + 1) % (NUM_STMT_HANDLES / 10) == 0)
{
printf("%d statements executed...\n", i + 1);
fflush(stdout);
}
}
for (i = 0; i < nhandles; i += (NUM_STMT_HANDLES / 10))
{
print_result(hstmt[i]);
fflush(stdout);
}
for (i = 0; i < nhandles; i++)
{
rc = SQLFreeStmt(hstmt[i], SQL_CLOSE);
CHECK_STMT_RESULT(rc, "SQLFreeStmt failed", hstmt[i]);
}
/* Try SQLPrepare/SQLExecute on multiple statements. */
printf("\nTesting interleaving operations on multiple prepared statements\n");
for (i = 0; i < 5; i++)
{
SQLSMALLINT colcount;
int j;
char *sqlbuf = sqlbufs[i];
sprintf(sqlbuf, "SELECT 'stmt no %d'", i);
for (j = 0; j < i; j++)
{
sprintf(&sqlbuf[strlen(sqlbuf)], ", 'col %d'", j);
}
strcat(sqlbuf, " FROM generate_series(1, 3)");
rc = SQLPrepare(hstmt[i], (SQLCHAR *) sqlbuf, SQL_NTS);
CHECK_STMT_RESULT(rc, "SQLPrepare failed", hstmt[i]);
/* Test SQLNumResultCols, called before SQLExecute() */
rc = SQLNumResultCols(hstmt[i], &colcount);
CHECK_STMT_RESULT(rc, "SQLNumResultCols failed", hstmt);
printf("# of result cols: %d\n", colcount);
}
for (i = 0; i < 5; i++)
{
rc = SQLExecute(hstmt[i]);
CHECK_STMT_RESULT(rc, "SQLExecute failed", hstmt[i]);
print_result(hstmt[i]);
}
test_disconnect();
/* free the buffers, to keep Valgrind from complaining about the leaks */
for (i = 0; i < NUM_STMT_HANDLES; i++)
free(sqlbufs[i]);
return 0;
}
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