🚀 go-pugleaf

On Thu, 24 May 2001 07:52:32 GMT, goble@gtech (David. E. Goble) wrote:
>
Hi All;

I have redHat 6.2 (server install)
I am trying to do some programming.

How that I know how to save the error messages, here is what is
happening;

/*######## Here is the c file I am trying to compile and run #######*/
/*
 * testlibpq.c Test the C version of Libpq, the Postgres frontend
 * library.
 *
 *
 */
#include<stdio.h>
#include "libpq-fe.h"

void exit_nicely(PGconn *conn)
{
    PQfinish(conn);
    exit(1);
}

main()
{
    char       *pghost,
               *pgport,
               *pgoptions,
               *pgtty;
    char       *dbName;
    int         nFields;
    int         i,
                j;

    /* FILE *debug; */

    PGconn     *conn;
    PGresult   *res;

    /*
     * begin, by setting the parameters for a backend connection if
the
     * parameters are null, then the system will try to use reasonable
     * defaults by looking up environment variables or, failing that,
     * using hardwired constants
     */
    pghost = NULL;              /* host name of the backend server */
    pgport = NULL;              /* port of the backend server */
    pgoptions = NULL;           /* special options to start up the
backend
                                 * server */
    pgtty = NULL;               /* debugging tty for the backend
server */
    dbName = "template1";

    /* make a connection to the database */
    conn = PQsetdb(pghost, pgport, pgoptions, pgtty, dbName);

    /*
     * check to see that the backend connection was successfully made
     */
    if (PQstatus(conn) == CONNECTION_BAD)
    	{
        fprintf(stderr, "Connection to database '%s' failed.\n",
dbName);
        fprintf(stderr, "%s", PQerrorMessage(conn));
        exit_nicely(conn);
    	}

    /* debug = fopen("/tmp/trace.out","w"); */
    /* PQtrace(conn, debug);  */

    /* start a transaction block */
    res = PQexec(conn, "BEGIN");
    if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
    	{
        fprintf(stderr, "BEGIN command failed\n");
        PQclear(res);
        exit_nicely(conn);
    	}

    /*
     * should PQclear PGresult whenever it is no longer needed to
avoid
     * memory leaks
     */
    PQclear(res);

    /*
     * fetch instances from the pg_database, the system catalog of
     * databases
     */
    res = PQexec(conn, "DECLARE mycursor CURSOR FOR select * from
pg_database");
    if(!res || PQresultStatus(res) != PGRES_COMMAND_OK)
    	{
        fprintf(stderr, "DECLARE CURSOR command failed\n");
        PQclear(res);
        exit_nicely(conn);
    	}
    PQclear(res);
    res = PQexec(conn, "FETCH ALL in mycursor");
    if(!res || PQresultStatus(res) != PGRES_TUPLES_OK)
    	{
        fprintf(stderr, "FETCH ALL command didn't return tuples
properly\n");
        PQclear(res);
        exit_nicely(conn);
    	}

    /* first, print out the attribute names */
    nFields = PQnfields(res);
    for (i = 0; i<nFields; i++)
        printf("%-15s", PQfname(res, i));
    printf("\n\n");

    /* next, print out the instances */
    for (i = 0; i<PQntuples(res); i++)
    	{
        for (j = 0; j<nFields; j++)
            printf("%-15s", PQgetvalue(res, i, j));
        printf("\n");
    	}
    PQclear(res);

    /* close the cursor */
    res = PQexec(conn, "CLOSE mycursor");
    PQclear(res);

    /* commit the transaction */
    res = PQexec(conn, "COMMIT");
    PQclear(res);

    /* close the connection to the database and cleanup */
    PQfinish(conn);

    /* fclose(debug); */
}

/*
This is how I am trying to do it;

gcc -O3 -o testlibpq testlibpq.c -I/usr/include/pgsql -Llibpq
2>testlibpq.txt

And here are the results

/tmp/cc2HM1Be.o: In function `exit_nicely':
/tmp/cc2HM1Be.o(.text+0x8): undefined reference to `PQfinish'
/tmp/cc2HM1Be.o: In function `main':
/tmp/cc2HM1Be.o(.text+0x66): undefined reference to `PQsetdbLogin'
/tmp/cc2HM1Be.o(.text+0x77): undefined reference to `PQstatus'
/tmp/cc2HM1Be.o(.text+0xa1): undefined reference to `PQerrorMessage'
/tmp/cc2HM1Be.o(.text+0xd4): undefined reference to `PQexec'
/tmp/cc2HM1Be.o(.text+0xeb): undefined reference to `PQresultStatus'
/tmp/cc2HM1Be.o(.text+0x118): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x130): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x141): undefined reference to `PQexec'
/tmp/cc2HM1Be.o(.text+0x158): undefined reference to `PQresultStatus'
/tmp/cc2HM1Be.o(.text+0x180): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x198): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x1a9): undefined reference to `PQexec'
/tmp/cc2HM1Be.o(.text+0x1c0): undefined reference to `PQresultStatus'
/tmp/cc2HM1Be.o(.text+0x1e8): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x200): undefined reference to `PQnfields'
/tmp/cc2HM1Be.o(.text+0x229): undefined reference to `PQfname'
/tmp/cc2HM1Be.o(.text+0x265): undefined reference to `PQntuples'
/tmp/cc2HM1Be.o(.text+0x29d): undefined reference to `PQgetvalue'
/tmp/cc2HM1Be.o(.text+0x2d7): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x2e8): undefined reference to `PQexec'
/tmp/cc2HM1Be.o(.text+0x2f9): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x30a): undefined reference to `PQexec'
/tmp/cc2HM1Be.o(.text+0x31b): undefined reference to `PQclear'
/tmp/cc2HM1Be.o(.text+0x327): undefined reference to `PQfinish'
collect2: ld returned 1 exit status
*/