我正在尝试使用 ecpg 程序连接到 PostgreSQL 数据库，但出现以下错误。
cc testecpg.c
/tmp/ccSzqgA7.o: In function `main':
testecpg.c:(.text+0x5d): undefined reference to `ECPGconnect'
testecpg.c:(.text+0x62): undefined reference to `ECPGget_sqlca'
testecpg.c:(.text+0x70): undefined reference to `sqlprint'
collect2: error: ld returned 1 exit status
执行 ecpg testecpg.pgc 后生成的 testecpg.c 文件
/* Processed by ecpg (4.11.0) */
/* These include files are added by the preprocessor */
#include "/opt/rh/rh-postgresql95/root/usr/include/ecpglib.h"
#include "/opt/rh/rh-postgresql95/root/usr/include/ecpgerrno.h"
#include "/opt/rh/rh-postgresql95/root/usr/include/sqlca.h"
/* End of automatic include section */
#line 1 "testecpg.pgc"
#include <stdio.h>
#include "/opt/rh/rh-postgresql95/root/usr/include/libpq-fe.h"
int main(void)
{
/* exec sql begin declare section */
#line 6 "testecpg.pgc"
char * dbname = "dbname" ;
#line 7 "testecpg.pgc"
char * db = "dbname@hostname:5432" ;
#line 8 "testecpg.pgc"
char * user = "user" ;
#line 9 "testecpg.pgc"
char * passwd = "password" ;
#line 10 "testecpg.pgc"
const char * target = "dbname@hostname:5432" ;
/* exec sql end declare section */
#line 11 "testecpg.pgc"
/* exec sql whenever sqlerror sqlprint ; */
#line 12 "testecpg.pgc"
{ ECPGconnect(0, 0, target , user , passwd , NULL, 0);
#line 13 "testecpg.pgc"
if (sqlca.sqlcode < 0) sqlprint();}
#line 13 "testecpg.pgc"
printf("connection succssfull");
}
有没有要包含的库或我错过的任何步骤？