PHP访问数据库

1.原生mysql方式

<?php	

        //最原生态的访问方式，不过SQL注入是个麻烦事

	$con = mysql_connect("localhost","root","sa123456");

	if($con)

	{

		mysql_select_db("dedecms");

		mysql_query("set names gbk");//设置数据访问编码，防止乱码

		$rs = mysql_query("select * from dede_area",$con);

		#var_dump(mysql_fetch_array($rs)); //同时提供数字索引与文本索引两种访问方式

		

		/*while($row = mysql_fetch_row($rs))

		{

			var_dump($row);

		}*/

		#var_dump( mysql_fetch_($rs) );

		#mysql_fetch_assoc($result)

		while($row = mysql_fetch_assoc($rs))//只提供文本索引访问数据

		{

			#var_dump($row);

			echo $row['name']."<br/>";

		}

	}

	mysql_close($con);

?>

2.优化过的mysql数据库访问方式，mysqli

<?php

        //mysqli的访问方式，更加OO且安全性和性能都有提升，参数的方式可防止SQL注入

	$mysqli = new mysqli("localhost","root","sa123456","phpdb");

	$mysqli->query("set names gbk");

	$sql = "insert into article(title,content,createBy,createTime) values(?,?,?,?)";

	$stmt = $mysqli->prepare($sql);

	$stmt->bind_param("ssss", $title,$content,$createBy,$createTime);

	$title = "hello!!!";

	$content = "这里是新闻的内容";

	$createBy = "admin";

	$createTime = date('Y-m-d H:i:s');

	$stmt->execute();

	$stmt->close();

	$mysqli->close();

?>

3.通用数据库访问方式，pdo

<?php

    try

    { 

        //pdo方式访问数据库，数据访问方式抽象到了更高层次，可支持灵活的切换为不同类型数据库

        $dsn = "mysql:host=localhost;dbname=dedecms";

        $pdo = new PDO($dsn, "root", "sa123456");

    } 

    catch (PDOException $e)

    {

        echo "Failed to get DB handle: " . $e->getMessage() . "\n";

        exit;

      }

      $pdo->query("set names gbk");

      $query = $pdo->prepare("select * FROM dede_area");

      $query->execute();

     

      for($i=0; $row = $query->fetch(); $i++){

        echo $i." - ".$row['name']."<br/>";

      }

      

?>