连接错误时，Postgres数据库用C - 使用的libpq-fe.h [英] Error when connecting to Postgres database in C - using libpq-fe.h

问题描述

我尝试使用的Postgres连接到数据库

Hey I am trying to connect to a database using postgres

#include <stdio.h>
#include <stdlib.h>
#include <libpq-fe.h>

int main(int argc, char* argv[])
{
//Start connection
PGconn* connection = PQconnectdb("host=webcourse.cs.nuim.ie dbname=cs621      sslmode=require user=ggales password=1234");

if (PQstatus(connection) ==CONNECTION_BAD)
{
printf("Connection error\n");
PQfinish(connection);
return -1; //Execution of the program will stop here
}
printf("Connection ok\n");
//End connection
PQfinish(connection);
printf("Disconnected\n");


return 0;
}

和我不断收到此编译错误：

And I keep getting this compile error:

main.c: In function ‘main’:
main.c:9:35: warning: missing terminating " character [enabled by default]
main.c:9:2: error: missing terminating " character
main.c:10:2: error: ‘dbname’ undeclared (first use in this function)
main.c:10:2: note: each undeclared identifier is reported only once for each function it      appears in
main.c:10:9: error: ‘cs621’ undeclared (first use in this function)
main.c:10:15: error: expected ‘)’ before ‘sslmode’
main.c:10:56: warning: missing terminating " character [enabled by default]
main.c:10:15: error: missing terminating " character
main.c:16:1: error: expected ‘,’ or ‘;’ before ‘}’ token
main.c:16:1: error: expected declaration or statement at end of input

有人能看到为什么会这样？

Can anyone see why this is happening?

感谢。

推荐答案

您code编译就好了。如果我将其粘贴到 x.c 我可以没有任何问题编译：

Your code compiles just fine. If I paste it into x.c I can compile it with no problems:

gcc -I /usr/pgsql-9.2/include -L /usr/pgsql-9.2/lib x.c -lpq

（路径可能您的系统上有所不同）。

(paths may differ on your system).

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