PDO

//PDO
//1.访问不同的数据库
//2.自带事务功能
//3.防止SQL注入

/*//1.造对象
$dsn = "mysql:dbname=mydb;host=localhost";
$pdo = new PDO($dsn,"root","123");

//2.写SQL语句
$sql = "update nation set name='兽族' where code='n013'";

//3.执行SQL语句
//$r = $pdo->query($sql);
$r = $pdo->exec($sql);*/

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

//设置异常模式
$pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);


//写SQL语句
$sql1 = "insert into nation values('n016','人族')";
$sql2 = "insert into nation values('n017','不死族')";

//执行两条SQL语句
try
{
    //启动事务
    $pdo->beginTransaction();
    
    $pdo->exec($sql1);
    $pdo->exec($sql2);
    
    //提交事务
    $pdo->commit();
}
catch(PDOException $e)
{
    //$e->getMessage();
    //回滚
    $pdo->rollBack();
}

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

//写SQL语句,预处理语句
$sql = "insert into nation values(?,?)";

//准备SQL语句,返回statement对象
$st = $pdo->prepare($sql);

//绑定参数
/*$st->bindParam(1,$code);
$st->bindParam(2,$name);

$code="n022";
$name="矮人族";*/

$attr = array("n023","魔族");

//提交执行,不用给SQL语句了，已经传过去了
var_dump($st->execute($attr));


//预处理语句里面用?占位的，给数组的时候要给索引数组

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

//写SQL语句,预处理语句，使用name占位
$sql = "insert into nation values(:code,:name)";

//准备执行
$st = $pdo->prepare($sql);

//绑定参数
/*$st->bindParam(":code",$code,PDO::PARAM_STR);
$st->bindParam(":name",$name,PDO::PARAM_STR);

$code="n024";
$name="狼族";*/

$attr = array("code"=>"n025","name"=>"虫族");

//执行
$st->execute($attr);

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

//写SQL语句,预处理语句
$sql = "select * from nation";

//准备执行
$st = $pdo->prepare($sql);

//执行
$st->execute();

//读数据
var_dump($st->fetchAll(PDO::FETCH_ASSOC));

//写SQL语句,预处理语句，使用name占位
$sql = "insert into nation values(:code,:name)";

//准备执行
$st = $pdo->prepare($sql);

//执行
$st->execute($_POST);