本文实例讲述了PHP的简单PDO操作。分享给大家供大家参考,具体如下:
网上关于PDO的资料很多。这里就不累赘了。
这里我将PDO所有操作封装到一个类里方便操作。
类代码如下:
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class DB { //pdo对象 public $con = NULL; function DB() { $this ->con = new PDO( "mysql:host=127.0.0.1;dbname=dbtest" , "root" , "xxx" , array ( PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES `utf8`' , PDO::ATTR_PERSISTENT => TRUE, )); $this ->con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $this ->con->setAttribute(PDO::ATTR_CASE, PDO::CASE_UPPER); } public function query( $sql , $para = NULL) { $sqlType = strtoupper ( substr ( $sql , 0, 6)); $cmd = $this ->con->prepare( $sql ); if ( $para != NULL) { $cmd ->execute( $para ); } else { $cmd ->execute(); } if ( $sqlType == "SELECT" ) { return $cmd ->fetchAll(); } if ( $sqlType == "INSERT" ) { return $this ->con->lastInsertId(); } return $cmd ->rowCount(); } } |
使用方法:
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include "pdo.php" ; $db = new DB(); $subjectList = $db ->query( "SELECT * FROM `table1`" ); $count = $db ->query( "UPDATE `table1` SET `name` = 'test' WHERE `id` = :id" , array ( ':id' => 795)); try { echo $db ->con->beginTransaction(); $count = $db ->con-> exec ( "UPDATE `table1` SET `name` = 'test1' WHERE `id` = 795" ); $count = $db ->con-> exec ( "UPDATE `table1` SET `name1` = 'test22' WHERE `id` = 795" ); $count = $db ->con-> exec ( "UPDATE `table1` SET `name1` = 'test333' WHERE `id` = 795" ); echo $db ->con->commit(); } catch (Exception $e ) { // MYSQL 的表类型 InnoDB(支持事务) MyISAM(不支持事务) echo $db ->con->rollBack(); throw new MyException( "事务测试错误" , $e ); } $db = NULL; |
PDO支持SQL语句以参数方式调用,可有效的防止SQL注入。
希望本文所述对大家PHP程序设计有所帮助。