PHP之PDO的使用
pdo方式连接数据库try{
$db = new PDO('mysql:host=127.0.0.1;dbname=test;port=3306;charset=utf8','root','123456');
}catch(PDOException $e){
echo 'mysql error: '.$e->getMessage();
}
1.excu()方式增删改，不推荐
$sql = "insert into test (username,password) values ('liming',123456)";
$res = $db->excu($sql);
echo $res //返回受影响的行数 1
2.PDOStatement类，增删改(推荐用这种方式，速度快，可以防止sql注入)
方式1-推荐
$sql = "insert into test (username,password) values (:name,:password)";
$data = [':name'=>'liming',':password'=>123456];
$stmt = $db->prepare($sql);
$res= $stmt->execute($data);
echo $res //返回受影响的行数 1
方式2,增删改一样
$name='maoxiaoming';//要插入的数据一定要先用变量定义，不然会报错
$password= md5(123456);
$sql = $sql = "insert into test (username,password) values (:name,:password)";
$stmt = $db->prepare($sql);
$stmt->bindParam(':name',$name);
$stmt->bindParam(':password',$password);
$res = $stmt->execute();
echo $res //返回受影响的行数 1
3.PDOStatement类查询所有数据
$sql= "select * from user";
$stmt = $db->prepare($sql);
$stmt->execute();
$res = $stmt->fetchAll(PDO::FATCH_ASSOC);
http://i2.运维网.com/images/blog/201807/31/647a96ecee0b8a5bab560d9df4da5f59.png
//查询一条
$sql = "select * from user where id=:id";
$data = [':id'=>3];
$stmt = $db->prepare($sql);
$stmt->execute($data);
echo '';
print_r($stmt->fetch(PDO::FETCH_ASSOC));
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