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/*
* testlibpq.c
*
* Test the C version of libpq, the PostgreSQL frontend library.
*/
#include <stdio.h>
#include <stdlib.h>
#include "libpq-fe.h"
static void
exit_nicely(PGconn *conn)
{
PQfinish(conn);
exit(1);
}
PGresult* FetchFirst(PGconn * conn){
PGresult* res = PQexec(conn, "FETCH FIRST in myportal");
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
fprintf(stderr, "FETCH failed: %s", PQerrorMessage(conn));
PQclear(res);
exit_nicely(conn);
}
return res;
}
int
main(int argc, char **argv)
{
PGconn *conn;
PGresult *res;
int nFields;
int i,
j;
const char *paramValues[1];
conn = PQsetdbLogin("localhost", NULL, NULL,NULL, "dbu", "root","ouvretoi");
if (PQstatus(conn) != CONNECTION_OK)
{
fprintf(stderr, "Connection to database failed: %s",
PQerrorMessage(conn));
exit_nicely(conn);
}
res = PQexec(conn, "BEGIN");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "BEGIN command failed: %s", PQerrorMessage(conn));
PQclear(res);
exit_nicely(conn);
}
PQclear(res);
res = PQprepare (conn,
"my_cursor",
"DECLARE myportal CURSOR FOR select * from tab_3 WHERE COL_3 = $1",
1, /* one param */
NULL);
PQclear(res);
paramValues[0]= "zzze";
res = PQexecPrepared(conn,
"my_cursor",
1,
paramValues,
NULL,
NULL,
1);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "DECLARE CURSOR failed: %s", PQerrorMessage(conn));
PQclear(res);
exit_nicely(conn);
}
PQclear(res);
res = FetchFirst(conn);
nFields = PQnfields(res);
for (i = 0; i < nFields; i++)
printf("%-15s", PQfname(res, i));
printf("\n\n");
while(PQresultStatus(res) == PGRES_TUPLES_OK && PQntuples(res) == 1)
{
for (j = 0; j < nFields; j++)
printf("%-15s", PQgetvalue(res, 0, j));
printf("\n");
PQclear(res);
res = PQexec(conn, "FETCH NEXT in myportal");
}
PQclear(res);
paramValues[0]= "ee";
res = PQexecPrepared(conn,
"my_cursor",
1,
paramValues,
NULL,
NULL,
1);
fprintf(stderr, " %s", PQerrorMessage(conn));
res = FetchFirst(conn);
/* first, print out the attribute names */
nFields = PQnfields(res);
for (i = 0; i < nFields; i++)
printf("%-15s", PQfname(res, i));
printf("\n\n");
while(PQresultStatus(res) == PGRES_TUPLES_OK && PQntuples(res) == 1)
{
for (j = 0; j < nFields; j++)
printf("%-15s", PQgetvalue(res, 0, j));
printf("\n");
PQclear(res);
res = PQexec(conn, "FETCH NEXT in myportal");
}
PQclear(res);
res = PQexec(conn, "CLOSE myportal");
PQclear(res);
/* end the transaction */
res = PQexec(conn, "END");
PQclear(res);
/* close the connection to the database and cleanup */
PQfinish(conn);
return 0;
} |
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