PHP5.2中PDO的简单使用方法,php5.2pdo使用方法
PHP5.2中PDO的简单使用方法,php5.2pdo使用方法
本文实例讲述了PHP5.2中PDO的简单使用方法。分享给大家供大家参考,具体如下:
一、PDO配置
1、确保PHP版本为5.2.5以上
2、在php.ini中找到Dynamic Extensions扩展部分,去掉extension=php_pdo.dll前面的分号
3、去掉相应数据库PDO扩展前面的分号,如:extension=php_pdo_mysql.dll
二、范例中数据库
CREATE TABLE tablename ( id mediumint(8) UNSIGNED NOT NULL AUTO_INCREMENT, str varchar(50) NOT NULL DEFAULT '''', PRIMARY KEY (id) );
三、程序范例
<?php $dsn = "mysql:host=localhost;dbname=test"; $user = ''root''; $passwd = ''123456''; try{ $db = new PDO($dsn, $user, $passwd); }catch (PDOException $e) { echo "链接数据库失败!"; print "异常信息: ". $e->getMessage() . "<br/>"; print "异常文件: " . $e->getFile() . "<br/>"; print "异常行号: " . $e->getLine() . "<br/>"; exit(); } //$sql = "INSERT INTO tablename SET str = ''Hello''"; //$count = $db->exec($sql); //返回值为影响的行数 //$sql = "DELETE FROM tablename WHERE str = ''Hello'' LIMIT 1"; //$count = $db->exec($sql); //返回值为影响的行数 //预处理需要查询的SQL语句 //$db->setAttribute(PDO::ATTR_CASE, PDO::CASE_NATURAL); //列名按照原始的方式(字段) $sql = "SELECT * FROM tablename WHERE id < :id AND str = :string"; //sql语句(参数绑定方式) $query = $db->prepare($sql); //预处理 //用一组绑定参数执行一遍查询 $query->execute(array('':id''=>1, '':string''=>''Hello'')); //处理语句(参数绑定方式) //$query->setFetchMode(PDO::FETCH_ASSOC); 关联数组形式(只通过字段名下标访问数组内容) while($item = $query->fetch(PDO::FETCH_ASSOC)) //循环获取数据 { echo $item[''id''].":".$item[''str'']."<br/>"; //print_r ($item); } //用另一组绑定参数,再执行一遍查询 $query->execute(array('':id''<=10, '':string''=>''HelloWorld'')); //处理语句(参数绑定方式) //$query->setFetchMode(PDO::FETCH_ASSOC); 关联数组形式(只通过字段名下标访问数组内容) while($item = $query->fetch(PDO::FETCH_ASSOC)) //循环获取数据 { echo $item[''id''].":".$item[''str'']."<br/>"; //print_r ($item); } $db = null; //释放数据库链接 ?>
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希望本文所述对大家PHP程序设计有所帮助。
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