How PDO operates MySQL

The PDO extension in PHP defines a lightweight, consistent interface for PHP to access the database. It provides a data access abstraction layer so that no matter what database is used, queries and retrieve data.

The PHP version supported by PDO is PHP5.1 and higher, and under PHP5.2 PDO is enabled by default.

The following is the configuration of PDO in php.ini:

extension=php_pdo.dll

In order to enable support for a certain database, you need to open the corresponding extension in the php configuration file. For example, to support MySQL, you need to open the following extension

extension=php_pdo_mysql.dll

The following is the use of PDO mysql performs basic add, delete, modify and query operations

Create a test database, and then run the following SQL statement:

DROP TABLE IF EXISTS `test`;
CREATE TABLE `test` (
`id` int(10) NOT NULL DEFAULT '0',
`user` char(20) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `idx_age` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Program code:

<?php
header("content-type:text/html;charset=utf-8");
$dsn="mysql:dbname=test;host=localhost";
$db_user=&#39;root&#39;;
$db_pass=&#39;admin123&#39;;
try{
$pdo=new PDO($dsn,$db_user,$db_pass);
}catch(PDOException $e){
echo &#39;数据库连接失败&#39;.$e->getMessage();
}
//新增
$sql="insert into test (id,user) values (1,'phpthinking')";
$res=$pdo->exec($sql);
echo '影响行数：'.$res;
//修改
$sql="update test set user='phpthinking' where id=1";
$res=$pdo->exec($sql);
echo '影响行数：'.$res;
//查询
$sql="select * from test";
$res=$pdo->query($sql);
foreach($res as $row){
echo $row['user'].'<br/>';
}
//删除
$sql="delete from test where id=1";
$res=$pdo->exec($sql);
echo '影响行数：'.$res;

Related recommendations:

PHP operation method of BLOB field in MySQL

PHP operation MySQL method guidance for PDO operation

PHP operation MySQL database

The above is the detailed content of How PDO operates MySQL. For more information, please follow other related articles on the PHP Chinese website!