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안녕하세요~
소스는...
#include <stdio.h>
#include "/usr/include/pgsql/libpq/fe.h"
// 이상한데 깔려있어서리.. //;
void exit_nicely(PGconn *conn)
{
PQfinish(conn);
exit(1);
}
int main()
{
char *pghost,
*pgport,
*pgoptions,
*pgtty;
char *dbName, *login, *pwd;
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 = "imsi";
login = "imsi";
pwd = NULL;
/* make a connection to the database */
conn = PQsetdbLogin(pghost, pgport, pgoptions, pgtty, dbName, login, pwd);
/*
* 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, "select * from imsi;");
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
fprintf(stderr, "select command failed\n");
PQclear(res);
exit_nicely(conn);
}
/*
* should PQclear PGresult whenever it is no longer needed to avoid
* memory leaks
*/
PQclear(res);
/* 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 connection to the database and cleanup */
PQfinish(conn);
/* fclose(debug); */
return 0;
}
에러메시지는..
cc imsi.c
/tmp/ccbd6W2N.o: In function `exit_nicely':
/tmp/ccbd6W2N.o(.text+0x8): undefined reference to `PQfinish'
/tmp/ccbd6W2N.o: In function `main':
/tmp/ccbd6W2N.o(.text+0x78): undefined reference to `PQsetdbLogin'
/tmp/ccbd6W2N.o(.text+0x89): undefined reference to `PQstatus'
/tmp/ccbd6W2N.o(.text+0xb3): undefined reference to `PQerrorMessage'
/tmp/ccbd6W2N.o(.text+0xe6): undefined reference to `PQexec'
/tmp/ccbd6W2N.o(.text+0xfd): undefined reference to `PQresultStatus'
/tmp/ccbd6W2N.o(.text+0x128): undefined reference to `PQclear'
/tmp/ccbd6W2N.o(.text+0x140): undefined reference to `PQclear'
/tmp/ccbd6W2N.o(.text+0x14c): undefined reference to `PQnfields'
/tmp/ccbd6W2N.o(.text+0x179): undefined reference to `PQfname'
/tmp/ccbd6W2N.o(.text+0x1b5): undefined reference to `PQntuples'
/tmp/ccbd6W2N.o(.text+0x1ed): undefined reference to `PQgetvalue'
/tmp/ccbd6W2N.o(.text+0x227): undefined reference to `PQclear'
/tmp/ccbd6W2N.o(.text+0x233): undefined reference to `PQfinish'
collect2: ld returned 1 exit status
이렇게 나와요.
libpq.so 이 파일은 /usr/lib에 깔려있답니다. 기본으로 /etc/ld.so.conf에 있는 폴더.. 예전엔 이렇지 않았던것 같은데.. 역시 다른 사람의 컴퓨터는 정말.....
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