PDOStatement::bindParam 、bindValue、bindColumn实例比较

PDOStatement::bindParam — 》绑定一个参数到指定的变量名。

bindParam问号占位符

<?php

header("content-type:text/html;charset=utf-8");
try{
    $pdo=new PDO('mysql:host=localhost;dbname=test','root','root');
    $sql="insert into user(username,password,email) values (?,?,?)";
    $stmt=$pdo->prepare($sql);

    $stmt->bindParam(1,$username);//参数索引位置，从一开始
    $stmt->bindParam(2,$password);
    $stmt->bindParam(3,$email);
    $username='imooc1';
    $password='imooc1';
    $email='[email protected]';
    $stmt->execute();

}catch(PDOException $e){
    echo $e->getMessage();
}
?>

bindParam命名占位符

<?php
header("content-type:text/html;charset=utf-8");
try{
    $pdo=new PDO('mysql:host=localhost;dbname=test','root','root');
    $sql="insert into user(username,password,email) values (:username,:password,:email)";
    $stmt=$pdo->prepare($sql);

    $stmt->bindParam(':username',$username,PDO::PARAM_STR);
    $stmt->bindParam(':password',$password,PDO::PARAM_STR);
    $stmt->bindParam(':email',$email,PDO::PARAM_STR);
    $username='imooc2';
    $password='imooc2';
    $email='[email protected]';
    $stmt->execute();

}catch(PDOException $e){
    echo $e->getMessage();
}
?>

PDOStatement:: bindValue —》把一个值绑定到一个参数。

bindValue问号占位符

<?php
try{
    $pdo=new PDO('mysql:host=localhost;dbname=test','root','root');
    $sql="insert into user(username,password,email) values(?,?,?)";
    $stmt=$pdo->prepare($sql);

    $stmt->bindValue(1,'imooc3');
    $stmt->bindValue(2,'imooc3');
    $stmt->bindValue(3,'[email protected]');
    $stmt->execute();

    $username='imooc4';
    $password='imooc4';
    $stmt->bindValue(1,$username);
    $stmt->bindValue(2,$password);
                 //对于email一样，可以一次绑定，多次使用
    $stmt->execute();
}catch(PDOException $e){
    echo $e->getMessage();
}
?>

bindValue命名占位符

<?php
try{
    $pdo=new PDO('mysql:host=localhost;dbname=test','root','root');
    $sql="insert into user(username,password,email) values(:username,:password,:email)";
    $stmt=$pdo->prepare($sql);

    $stmt->bindValue(':username','imooc33');
    $stmt->bindValue(':password','imooc33');
    $stmt->bindValue('email','[email protected]');
    $stmt->execute();

    $username='imooc44';
    $password='imooc44';
    $stmt->bindValue(':username',$username);
    $stmt->bindValue(':password',$password);
    //对于email一样，可以一次绑定，多次使用
    $stmt->execute();
}catch(PDOException $e){
    echo $e->getMessage();
}
?>

PDOStatement:: bindColumn —》绑定一列到php变量

<?php

header("content-type:text/html;charset=utf-8");
try{
    $pdo=new PDO('mysql:host=localhost;dbname=test','root','root');
     $sql='select username,password,email from  user';
     $stmt=$pdo->prepare($sql);
     $stmt->execute();
     echo '结果集中的列数有'.$stmt->columnCount().'列'.'<br>';
     $stmt->bindColumn(1,$username);
     $stmt->bindColumn(2,$password);
     $stmt->bindColumn(3,$email);

     while($stmt->fetch(PDO::FETCH_BOUND)){
         echo '用户名：'.$username.'密码：'.$password.'邮件：'.$email;
         echo "<br>";
     }
}catch(PDOException $e){
    echo $e->getMessage();
}
?>

PDOStatement::bindParam 、bindValue、bindColumn实例比较

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