linux通过c语言编程访问远程mysql

首先开启远程mysql访问允许
mysql -u root -p
mysql>use mysql;
mysql>select 'host' from user where user='root';
mysql>update user set host = '%' where user ='root';
mysql>flush privileges;
mysql>select 'host'   from user where user='root';

到mysql的官网下载 Connector/C (libmysql) A client library for C development.

把下载的文件解压
tar xvzf mysql-connector-c-6.0.2-linux-glibc2.3-x86-32bit.tar.gz

把解压以后的include文件夹里的文件拷贝到/usr/include/mysql文件夹下
mkdir /usr/include/mysql
cp -rf include/* /usr/include/mysql

把解压以后的lib文件夹里的文件放到/usr/lib文件夹下
cp lib/* /usr/lib/

编写测试程序

#include <stdio.h>
#include <stdlib.h>
#include "mysql/mysql.h"  

int main(void)
{
    const char *host = "59.71.72.133";
    const char *user = "root";
    const char *pass = "";
    const char *db   = "mysql";
    /* 定义mysql变量 */
    MYSQL mysql;
    MYSQL_RES *rs;
    MYSQL_ROW row;
    mysql_init(&mysql); /* 初始化 */
    /* 连接数据库 */
    if (!mysql_real_connect(&mysql, host, user, pass, db, 0, NULL, 0))
    {
        printf("数据库连接失败： %s\n", mysql_error(&mysql));
    } else {
        printf("数据库连接成功！\n");
    }
    char *sql = "select host,user from user order by rand()";
    if (mysql_query(&mysql, sql)!=0)
    { /* 查询 */
        printf( "%s", mysql_errno(&mysql), mysql_error(&mysql));
    }
    rs = mysql_store_result(&mysql); /* 获取查询结果 */
    while ((row = mysql_fetch_row(rs)))
    {    /* 获取每一行记录 */
        printf( "%s---%s", row[0], row[1]);
    }
    mysql_free_result(rs); /* 释放结果集 */
    mysql_close(&mysql); /* 关闭连接 */
    return 1;
}

用以下命令使用 GCC 编译 这个 C源文件.
gcc -o mysqltest -g mysqltest.c -lmysqlclient

./mysqltest