PDO operation MySQL Basic tutorial share

the PDO extension in PHP defines a lightweight, consistent interface to the PHP Access database, which provides a data access abstraction layer so that queries and data can be executed through a consistent function, regardless of the database used.

the PHP version supported by PDO is PHP5.1 and higher, and the PDO is turned on by default under PHP5.2,

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

Extension=php_pdo.dll


In order to enable support for a database, you need to open the appropriate extension in the PHP configuration file, for example, to support MySQL, you need to open the following extension

Extension=php_pdo_mysql.dll


here are the basic additions and deletions to MySQL using PDO
Create the test database, and then run the following SQL statement:

DROP TABLE IF EXISTS ' test ';
CREATE TABLE ' test ' (
' id ' int (ten) not NULL DEFAULT ' 0 ',
' user ' char (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= ' root ';
$db _pass= ' admin123 ';
try{
$pdo =new PDO ($DSN, $db _user, $db _pass);
}catch (pdoexception $e) {
Echo ' database connection failed '. $e->getmessage ();
}
//New
$sql = "INSERT INTO Test (Id,user) VALUES (1, ' phpthinking ')";
$res = $pdo->exec ($sql);
echo ' affects number of rows: '. $res;
//Modify
$sql = "Update test set user= ' phpthinking ' where id=1";
$res = $pdo->exec ($sql);
echo ' affects number of rows: '. $res;
//Enquiry
$sql = "SELECT * from Test";
$res = $pdo->query ($sql);
foreach ($res as $row) {
echo $row [' user ']. ' <br/> ';
}
//Delete
$sql = "Delete from test where id=1";
$res = $pdo->exec ($sql);
echo ' affects number of rows: '. $res;

PDO operation MySQL Basic tutorial share