CentOS下的C连接Mysql数据库-优快云博客

1、修改密码

因为默认是没有密码的为了安全先修改密码，方法是：

先停止mysql

/etc/init.d/mysql stop

--  安全模式启动
[root@mysql var]#mysqld_safe --skip-grant-tables &
[1] 10912
[root@mysql var]# 110407 17:39:28 mysqld_safe Logging to '/usr/local/mysql/var//mysql.chinascopefinanical.com.err'.
110407 17:39:29 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var/

[root@mysql var]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or /g.
Your MySQL connection id is 48
Server version: 5.1.41-log Source distribution

Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.

mysql> use mysql;
Database changed

mysql> update user set password=password("yourpasswd) where user='root' and host='localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> quit
Bye

完成上面的操作之后，/etc/init.d/mysqld restart重启mysql

完成上面的操作之后密码就设定好了。

2、安装支持库

root

键入yum search mysql

出现

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

 * base: mirrors.ta139.com

 * extras: mirrors.ta139.com

 * updates: mirrors.ta139.com

================================ Matched: mysql ================================

mod_auth_mysql.i386 : 使用 MySQL 数据库的 Apache 万维网服务器的基础验证。

qt-MySQL.i386 : 用于 Qt 的 SQL 类别的 MySQL 驱动程序。

MySQL-python.i386 : 一个到 MySQL 的界面

apr-util-mysql.i386 : APR utility library MySQL DBD driver

bytefx-data-mysql.i386 : MySQL database connectivity for Mono

freeradius-mysql.i386 : freeradius 的 MySQL 绑定

freeradius2-mysql.i386 : MySQL support for freeradius

libdbi-dbd-mysql.i386 : libdbi 的 MySQL 插件

mysql.i386 : MySQL client programs and shared libraries

mysql-bench.i386 : MySQL benchmark scripts and data

mysql-connector-odbc.i386 : MySQL 的 ODBC 驱动程序。

mysql-devel.i386 : Files for development of MySQL applications


mysql-server.i386 : The MySQL server and related files

mysql-test.i386 : The test suite distributed with MySQL

pdns-backend-mysql.i386 : MySQL backend for pdns

perl-DBD-MySQL.i386 : perl 的 MySQL 接口

perl-DBD-Pg.i386 : Perl 的 PostgresSQL 界面

php-mysql.i386 : 一个用于使用 MySQL 数据库的 PHP 程序的模块。

php-pdo.i386 : A database access abstraction module for PHP applications

php-pear-MDB2-Driver-mysql.noarch : MySQL MDB2 driver

php53-mysql.i386 : A module for PHP applications that use MySQL databases

php53-pdo.i386 : A database access abstraction module for PHP applications

qt4-mysql.i386 : MySQL drivers for Qt's SQL classes

rsyslog.i386 : Enhanced system logging and kernel message trapping daemon

rsyslog-mysql.i386 : MySQL support for rsyslog





unixODBC.i386 : 一个用于 Linux 的完整的 ODBC 驱动程序管理器。



红色部分就是我们要的：

yum install mysql-devel-i386 开始安装



3、编写程序mysql.c

#include <stdlib.h>

#include <stdio.h>

#include <mysql/mysql.h>

MYSQL *conn_ptr;



int main(void){

	

	conn_ptr = mysql_init(NULL);

	if (!conn_ptr)

	{

		fprintf(stderr,"mysql_init failed!/n");

		return (-1);

	}

	

	conn_ptr = mysql_real_connect(conn_ptr,"127.0.0.1","root","","mysql",3306,0,NULL);

	if (conn_ptr)

	{

		printf ("connection succeed!/n");

	}

	else{

		printf ("connection failed!/n");

		return (-2);

	}

	

	mysql_close(conn_ptr);

	printf ("connection close!/n");

	

	return 0;



}



4、编译程序

gcc -o mydbcon -I /usr/include/mysql/ -L /usr/lib/mysql -lmysqlclient mysql.c



5、执行程序

./mydbcon



connection succeed!

connection close!