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php入门之php操作mysql数据库实例代码

Jun 13, 2016 am 10:14 AM
mysql php code getting Started and Example operate data database data query of Simple

这是一篇简单的php和mysql数据查询数据的简单入门篇,我们讲到了最重要的几个函数详细的介绍了一下,有需要的同学可以看看。

 代码如下 复制代码

//链接数据库

$conn = @mysql_connect("localhost","root","88888888") or die ("链接错误");

/*
mysql_connect() 函数打开非持久的 MySQL 连接。

语法
mysql_connect(server,user,pwd,newlink,clientflag)参数 描述
server 可选。规定要连接的服务器。

可以包括端口号,例如 "hostname:port",或者到本地套接字的路径,例如对于 localhost 的 ":/path/to/socket"。

如果 PHP 指令 mysql.default_host 未定义(默认情况),则默认值是 'localhost:3306'。
 
user 可选。用户名。默认值是服务器进程所有者的用户名。
pwd 可选。密码。默认值是空密码。

*/

 代码如下 复制代码

 //解决中文乱码

mysql_query("set names 'GBK'"); 

//打开数据库
mysql_select_db("wordpress",$conn) or die("打开失败");
$sql = "select * from wp_posts";

mysql_select_db() 函数设置活动的 MySQL 数据库。

如果成功,则该函数返回 true。如果失败,则返回 false。

语法
mysql_select_db(database,connection)参数 描述
database 必需。规定要选择的数据库。
connection 可选。规定 MySQL 连接。如果未指定,则使用上一个连接。

 

 代码如下 复制代码

//执行sql语句
$result = mysql_query($sql,$conn);

//循环打印所需参数
while($row = mysql_fetch_array($result))
{
    echo $row[4]."
";//测验多次,$row[4]中只能为索引,不能为列名,郁闷中ing
}

mysql_fetch_array() 函数从结果集中取得一行作为关联数组,或数字数组,或二者兼有

返回根据从结果集取得的行生成的数组,如果没有更多行则返回 false。

语法
mysql_fetch_array(data,array_type)参数 描述
data 可选。规定规定要使用的数据指针。该数据指针是 mysql_query() 函数产生的结果。
array_type 可选。规定返回哪种结果。可能的值:

MYSQL_ASSOC - 关联数组
MYSQL_NUM - 数字数组
MYSQL_BOTH - 默认。同时产生关联和数字数组

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