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/>";
}

?>