以下内容来自 beginning linux programming一书
c连接mysql两步骤
1. 初始化一个连接句柄结构
2. 实际进行连接
#include <stdlib.h>
#include <stdio.h>
#include "mysql.h"
int main(char arc,char *argv[])
{
MYSQL *conn_ptr;
conn_ptr = mysql_init(NULL);
conn_ptr = mysql_real_connect(conn_ptr,"localhost","rick","123456",
"foo",0,NULL,0);
if(conn_ptr)
printf("connection success\n");
mysql_close(conn_ptr);
}
exit(EXIT_SUCCESS);
//错误处理
#include <stdlib.h>
#include <stdio.h>
#include "mysql.h"
int main(char arc,char *argv[])
{
MYSQL my_connection;
mysql_init(&my_connection);
if(mysql_real_connect(&my_connection,"localhost","rick","i don't know",
"foo",0,NULL,0))
{
printf("connection success\n");
mysql_close(&my_connection);
}
else
{
fprintf(stderr,"connection failed\n");
if(mysql_errno(&my_connection))
fprintf(stderr,"connection error %d:%s\n",mysql_errno(&my_connection),mysql_error(&my_connection));
if(mysql_errno(&my_connection))
fprintf(stderr,"connection error %d:%s\n",mysql_errno(&my_connection),mysql_error(&my_connection));
}
exit(EXIT_SUCCESS);
}
说明:mysql_real_connect其中一个参数”i don't know‘对应不正确的密码,所以连接失败。
输出:connection failed
connection error 1045:Access denied for user 'rick'@'localhost' (using password: YES)
编译指令:gcc 源文件名 -I/usr/include/mysql -L/sur/lib/mysql -lmysqlclient -o 目的文件名

本文通过两个示例演示了如何使用C语言连接到MySQL数据库。首先介绍了连接的基本步骤,包括初始化连接句柄结构和实际连接过程。接着展示了如何处理连接失败的情况,并提供了具体的错误输出示例。

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