PDO：： 数据访问抽象层 ？ ：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<?php
//定义数据源
$dsn="mysql:dbname=test2;host=localhost";
//$dsn="sqlsrv:dbname";
//造pdo对象
$pdo=new PDO($dsn,"root","123");
//写SQL语句
$sql="select * from Info";
//准备执行语句
$st=$pdo->prepare($sql);
//执行预处理语句
$st->execute();// 条件判断 返回true 或 false
if ($st->execute()) {
print_r($st->fetch()); //一次调用一条
}
else{
echo "执行失败！";
}
//从结果集中取所有数据，返回二维数组
//print_r($st->fetchAll(PDO::FETCH_NUM));
//从结果集中取一条数据中的某一列，返回字符串
//var_dump($st->fetchColumn(1));
//从结果集中取一条数据，返回一个实体类的对象
//var_dump($st->fetchObject());
?>
</body>
</html>
② ？？？？？ prepare($sql) bindParam(1,$XX) $XX="ss" exectue() 方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<?php
//造PDO对象
$pdo=new PDO("mysql:dbname=test2;host=localhost","root","123");
//写SQl语句
$sql="insert into Info values(?,?,?,?,?)";
//准备SQL语句
$st=$pdo->prepare($sql);
//给SQL语句分配变量
$st->bindParam(1,$code);
$st->bindParam(2,$name);
$st->bindParam(3,$sex);
$st->bindParam(4,$nation);
$st->bindParam(5,$birthday);
//给变量赋值
$code="p120";
$name="回家";
$sex=true;
$nation="n002";
$birthday="1988-9-6";
//执行SQL语句
$st->execute();
?>
</body>
</html>
？？？？？ prepare($sql) exectue(array("ss")) 方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<?php
//造PDO对象
$pdo=new PDO("mysql:dbname=test2;host=localhost","root","123");
//写SQl语句
$sql="insert into Info values(?,?,?,?,?)";
//准备SQL语句
$st=$pdo->prepare($sql);
$st->execute(array('p0030','克隆',true,'n001','1989-2-3'));//把分配变量和赋值干掉，只用这句。
?>
</body>
</html>
③：：：：： prepare($sql) bindParam("",$XX,PDO::PARAM_STR); $XX="" exectue() 方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<?php
//造PDO对象
$pdo=new PDO("mysql:dbname=test2;host=localhost","root","123");
//写SQl语句
$sql="insert into info values(:c,:n,:s,:na,:b)";
//准备SQL语句
$st=$pdo->prepare($sql);
//绑定参数
$st->bindParam("c",$code,PDO::PARAM_STR);
$st->bindParam("n",$name,PDO::PARAM_STR);
$st->bindParam("s",$sex,PDO::PARAM_STR);
$st->bindParam("na",$nation,PDO::PARAM_STR);
$st->bindParam("b",$birthday,PDO::PARAM_STR);
//参数赋值
$code="p181";
$name="纳";
$sex=true;
$nation="n002";
$birthday="1988-2-3";
//执行
$st->execute();
?>
</body>
</html>
：：：：： prepare($sql) execute(); 方式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<?php
//造PDO对象
$pdo=new PDO("mysql:dbname=test2;host=localhost","root","123");
//写SQl语句
$sql="insert into info values(:c,:n,:s,:na,:b)";
//准备SQL语句
$st=$pdo->prepare($sql);
$st->execute(array('c'=>'p190','n'=>'水果','s'=>true,'na'=>'n002','b'=>'1990-2-3'));
?>
</body>
</html>
