第二章 C语言实例 —— Mysql控制

经常用到C语言去控制MYSQL，以下是个人写的

 

我的mysql目录(从网上下载之后直接解包后的目录),最近的Mysql不用进行安装

[www@zhoubc mysql]$ ls /home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/lib/
libmysqlclient.a    libmysqlclient_r.so     libmysqlclient_r.so.18.0.0  libmysqlclient.so.18      libmysqld.a        libmysqlservices.a      plugin
libmysqlclient_r.a  libmysqlclient_r.so.18  libmysqlclient.so           libmysqlclient.so.18.0.0  libmysqld-debug.a  libtcmalloc_minimal.so

[www@zhoubc mysql]$ ls /home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/include/
decimal.h   m_string.h      my_config.h  my_global.h   mysql            mysql_embed.h    my_sys.h           plugin.h       sslopt-longopts.h
errmsg.h    my_alloc.h      my_dbug.h    my_list.h     mysql_com.h      mysql.h          my_xml.h           sql_common.h   sslopt-vars.h
keycache.h  my_attribute.h  my_dir.h     my_net.h      mysqld_ername.h  mysql_time.h     plugin_audit.h     sql_state.h    typelib.h
m_ctype.h   my_compiler.h   my_getopt.h  my_pthread.h  mysqld_error.h   mysql_version.h  plugin_ftparser.h  sslopt-case.h

 

 

1.编写main.c

 

#include <stdio.h>
#include <stdlib.h>

#include <mysql.h>

int main(int argc, char *argv[]){
    const char *host = "localhost";
    const char *user = "root";
    const char *password = ""; 
    const char *db = "mysql";

    MYSQL conn;

    printf("Start Mysql init=====================================\n");
    mysql_init(&conn); /* 初始化 */
    if (!mysql_real_connect(&conn, host, user, password, db, 0, NULL, 0)){
        printf("Open the %s connect is failure!", mysql_error(&conn));
        return -1; 
    }   

    printf("Start Mysql query=====================================\n");
    /* 查询 */
    char *sql = "select * from user";
    if (mysql_query(&conn, sql) != 0){ 
        printf("%s \n", mysql_errno(&conn), mysql_error(&conn));
    }   

    MYSQL_RES *rs = mysql_store_result(&conn); /* 获取结果 */
    MYSQL_ROW row;
    while(row = mysql_fetch_row(rs)){ /* 一行一行的记录 */
        printf("%s===============%s\n",row[0],row[1]);
    }   

    mysql_free_result(rs);
    mysql_close(&conn);

    return 0;
}

 

2.编写Makefile

CC=gcc

1:
    $(CC) main.c  -L/home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/lib -lmysqlclient -I/home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/include -Wl,-rpath,/home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/lib -o mysql

3.编译

[www@zhoubc mysql]$ make
gcc main.c  -L/home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/lib -lmysqlclient -I/home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/include -Wl,-rpath,/home/zhoubaochuan/mysql-5.5.11-linux2.6-i686/lib -o mysql

 

 

 

4.执行代码

[www@zhoubc mysql]$ ./mysql 
Open the Can't connect to local MySQL server through socket '/tmp/mysql.sock' (111) connect is failure!

    错误:MYSQL SERVER未启动

 

5.启动MYSQL SERVER

 

[root@zhoubc mysql-5.5.11-linux2.6-i686]# /etc/init.d/mysql.server start
Starting MySQL                                             [确定]

 

6.再次执行

[www@zhoubc mysql]$ ./mysql 
Start Mysql init=====================================
Start Mysql query=====================================
localhost===============root
zhoubc===============root
127.0.0.1===============root
::1===============root
localhost===============
zhoubc===============