php实现基于PDO的预处理示例

$servername="localhost";$username="root";$password="admin";//$dbname为我的test数据库$dbname="test";try{  $conn=new PDO("mysql:host=$servername;dbname=$dbname",$username,$password);  //设置pdo错误异常处理  $conn->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);  //预处理SQL并绑定参数  $stmt=$conn->prepare("INSERT INTO user(user_first,user_last,age)VALUES(:user_first,:user_last,:age)");  $stmt->bindParam(":user_first",$user_first);  $stmt->bindParam(":user_last", $user_last);  $stmt->bindParam(":age",$age);  //要执行的插入记录  $user_first="xiao";  $user_last="liang";  $age=15;  $stmt->execute();  //要执行的插入记录  $user_first="xiao";  $user_last="cheng";  $age=23;  $stmt->execute();  echo "News record created successfully!";}catch(PDOException $e){  echo "Error:".$e->getMessage();}$conn=null;