PDO

Posted 2020-07-11 翟喵儿

 

 

<?php
//造DSN：驱动名:dbname=数据库名;host=服务器地址
$dsn = "mysql:dbname=mydb;host=localhost";
//造PDO对象
$pdo = new PDO($dsn,"root","123");

//写SQL语句
$sql = "select * from Info";

//执行SQL语句
//$v = $pdo->query($sql);
//返回的对象比较特殊，可以直接用循环遍历
/*foreach($v as $a)
{
    echo $a[0];
}*/

//预处理，先把SQL语句放到服务器上等待我们给他指令去执行
//准备一条SQL语句
$stm = $pdo->prepare($sql);

//执行准备好的SQL语句,成功返回true，失败返回false
if($stm->execute())
{
    //1.逐行取数据
    //var_dump($stm->fetch());
    //2.取所有的
    //var_dump($stm->fetchAll(PDO::FETCH_OBJ));
    //3.取某一列
    //var_dump($stm->fetchColumn(1));
    //4.返回对象
    //var_dump($stm->fetchObject());
    
}
else
{
    echo "执行失败！";
}

?>

<?php

//造对象
$dsn = "mysql:dbname=mydb;host=localhost";
$pdo = new PDO($dsn,"root","123");

//写SQL语句,参数用?来代替
//$sql = "insert into Nation values(?,?)";
$sql = "insert into Nation values(:code,:name)";
//预处理
$stm = $pdo->prepare($sql);

//给参数绑定值
/*$stm->bindParam(1,$code);
$stm->bindParam(2,$name);
$code = "p100";
$name = "回家";*/

/*$stm->bindParam("code",$code,PDO::PARAM_STR);
$stm->bindParam("name",$name,PDO::PARAM_STR);
$code = "p102";
$name = "回家";*/

//造数组
//$attr  = array("p101","很快");
//$attr  = array("code"=>"p103","name"=>"shj");

//执行
if($stm->execute($_POST))
{
    echo "添加成功";
}
else
{
    echo "添加失败";
}

?>