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();
}
}
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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;
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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。