PDO

1 //PDO
2 //1.访问不同的数据库
3 //2.自带事务功能
4 //3.防止SQL注入
5
6 /*//1.造对象
7 $dsn = "mysql:dbname=mydb;host=localhost";
8 $pdo = new PDO($dsn,"root","123");
9
10 //2.写SQL语句
11 $sql = "update nation set name='兽族' where code='n013'";
12
13 //3.执行SQL语句
14 //$r = $pdo->query($sql);
15 $r = $pdo->exec($sql);*/
16
17 //事务功能
18 //造对象
19 $dsn = "mysql:dbname=mydb;host=localhost";
20 $pdo = new PDO($dsn,"root","123");
21
22 //设置异常模式
23 $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
24
25
26 //写SQL语句
27 $sql1 = "insert into nation values('n016','人族')";
28 $sql2 = "insert into nation values('n017','不死族')";
29
30 //执行两条SQL语句
31 try
32 {
33     //启动事务
34     $pdo->beginTransaction();
35
36     $pdo->exec($sql1);
37     $pdo->exec($sql2);
38
39     //提交事务
40     $pdo->commit();
41 }
42 catch(PDOException $e)
43 {
44     //$e->getMessage();
45     //回滚
46     $pdo->rollBack();
47 }

1 //造对象
2 $dsn = "mysql:dbname=mydb;host=localhost";
3 $pdo = new PDO($dsn,"root","123");
4
5 //写SQL语句,预处理语句
6 $sql = "insert into nation values(?,?)";
7
8 //准备SQL语句,返回statement对象
9 $st = $pdo->prepare($sql);
10
11 //绑定参数
12 /*$st->bindParam(1,$code);
13 $st->bindParam(2,$name);
14
15 $code="n022";
16 $name="矮人族";*/
17
18 $attr = array("n023","魔族");
19
20 //提交执行,不用给SQL语句了，已经传过去了
21 var_dump($st->execute($attr));
22
23
24 //预处理语句里面用?占位的，给数组的时候要给索引数组

1 //造对象
2 $dsn = "mysql:dbname=mydb;host=localhost";
3 $pdo = new PDO($dsn,"root","123");
4
5 //写SQL语句,预处理语句，使用name占位
6 $sql = "insert into nation values(:code,:name)";
7
8 //准备执行
9 $st = $pdo->prepare($sql);
10
11 //绑定参数
12 /*$st->bindParam(":code",$code,PDO::PARAM_STR);
13 $st->bindParam(":name",$name,PDO::PARAM_STR);
14
15 $code="n024";
16 $name="狼族";*/
17
18 $attr = array("code"=>"n025","name"=>"虫族");
19
20 //执行
21 $st->execute($attr);

1 //造对象
2 $dsn = "mysql:dbname=mydb;host=localhost";
3 $pdo = new PDO($dsn,"root","123");
4
5 //写SQL语句,预处理语句
6 $sql = "select * from nation";
7
8 //准备执行
9 $st = $pdo->prepare($sql);
10
11 //执行
12 $st->execute();
13
14 //读数据
15 var_dump($st->fetchAll(PDO::FETCH_ASSOC));

1 //写SQL语句,预处理语句，使用name占位
2 $sql = "insert into nation values(:code,:name)";
3
4 //准备执行
5 $st = $pdo->prepare($sql);
6
7 //执行
8 $st->execute($_POST);

转载于:https://www.cnblogs.com/The-second/p/6041578.html

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