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php第十八节课

2016-05-14 11:24 585 查看

[b]PDO[/b]

对不同的数据库连接使用

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<?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！";
}

?>
</body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<?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";
}

?>
</body>
</html>

自己打的配置工具

<?php
class pdoa
{
public $host = "localhost"; //数据库地址
public $uid = "root"; //数据库用户名、
public $pwd = ""; //数据库密码

//执行SQL语句,返回相应的结果的方法
//参数：$sql代表要执行的SQL语句，$type是SQL语句类型0代表查询1代表其他，$db代表要操作的数据库
public function Prepare($sql,$db="bcs")
{
$dsn = "mysql:dbname=$db;host=$this->host";
$pdo = new PDO($dsn,$this->uid,$this->pwd);

//3.执行SQL语句
$stm = $pdo->prepare($sql);

if($stm->execute())
{
return $stm->fetchAll();
}
else
{
echo "连接失败";
}

}
}

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