3. PDOStatement 对象
2024-05-12 00:33:58
1. quote()方法
login.php
<html>
<head><meta http-equiv="content-type" content="text/html;charset=utf-8"/>
</head><body>
<form action="index.php" method="post">用户名：<input type="text" name="username"><br/>密 码：<input type="password" name="password"/><br/><input type="submit" value="提交"/><input type="reset" value="重置"/>
</form>
</body>
</html>index.php
<?phpheader('content-type:text/html;charset=utf-8');
$username = $_POST['username'];
$password = $_POST['password'];try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "select * from user where username='{$username}' and password='{$password}'";echo $sql,'<br/>';$res = $pdo->quote($sql);echo $res;//var_dump($res);die;$stmt = $pdo->query($sql);echo $stmt->rowCount();} catch (PDOException $e) {echo $e->getMessage();
}
2.预处理占位符
<?phpheader('content-type:text/html;charset=utf-8');
$username = $_POST['username'];
$password = $_POST['password'];try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');/*$sql = "select * from user where username=:username and password=:password";$stmt = $pdo->prepare($sql);$stmt->execute(array(':username'=>$username,':password'=>$password));*/$sql = "select * from user where username=? and password=?";$stmt = $pdo->prepare($sql);$stmt->execute(array($username,$password));echo $stmt->rowCount();} catch (PDOException $e) {echo $e->getMessage();
}3.绑定参数
命名参数占位符：try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "insert into user(username,password,email) values(:username,:password,:email)";$stmt = $pdo->prepare($sql);$stmt->bindParam(':username',$username,PDO::PARAM_STR);$stmt->bindParam(':password',$password,PDO::PARAM_STR);$stmt->bindParam(':email',$email);$username = 'abc123';$password = 'abc123';$email = 'ab123c@qq.com';$stmt->execute();echo $stmt->rowCount();
} catch (PDOException $e) {echo $e->getMessage();
}问号占位符：header('content-type:text/html;charset=utf-8');try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "insert into user(username,password,email) values(?,?,?)";$stmt = $pdo->prepare($sql);$stmt->bindParam(1,$username); //索引从 1 开始$stmt->bindParam(2,$password);$stmt->bindParam(3,$email);$username = 'username1';$password = 'username';$email = 'username';$stmt->execute();echo $stmt->rowCount();
} catch (PDOException $e) {echo $e->getMessage();
}删除：try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "delete from user where id>:id";$stmt = $pdo->prepare($sql);$stmt->bindParam(':id',$id,PDO::PARAM_INT);$id = 3;$stmt->execute();echo $stmt->rowCount();
} catch (PDOException $e) {echo $e->getMessage();
}4.bindValue()
可以让参数一些可变，一些不变：try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "insert into user(username,password,email) values(?,?,?)";$stmt = $pdo->prepare($sql);$username = 'wwoo123';$password = '123456aaa';$stmt->bindValue(1,$username);$stmt->bindValue(2,$password);$stmt->bindValue(3,'imooc@imooc.com');$stmt->execute();echo $stmt->rowCount();} catch (PDOException $e) {echo $e->getMessage();
}try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "insert into user(username,password,email) values(:username,:password,:email)";$stmt = $pdo->prepare($sql);$username = 'wwoo123weee';$password = '123456aaa';$stmt->bindValue(':username',$username);$stmt->bindValue(':password',$password);$stmt->bindValue(':email','imooc@imooc.com');$stmt->execute();echo $stmt->rowCount();} catch (PDOException $e) {echo $e->getMessage();
}5. bindColumn()
try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "select username,password,email from user";$stmt = $pdo->prepare($sql);$stmt->execute();echo '结果集的列数 ： ' . $stmt->columnCount() . '<br/>';var_dump($stmt->getColumnMeta(0));//把列值绑定到指定变量$stmt->bindColumn(1,$username);$stmt->bindColumn(2,$password);$stmt->bindColumn(3,$email);while ($stmt->fetch(PDO::FETCH_BOUND)) {echo '用户名：' . $username . '<br/>';echo '密码：' . $password . '<br/>';echo '邮箱：' . $email . '<br/>';}} catch (PDOException $e) {echo $e->getMessage();
}6. fetchColunm()
try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "select id,username,password,email from user";$stmt = $pdo->query($sql);var_dump($stmt);//得到结果集第一行的第一列echo $stmt->fetchColumn(0);echo '<br/>';//得到结果集第二行的第4列echo $stmt->fetchColumn(3);
} catch (PDOException $e) {echo $e->getMessage();
}7.debugDumpParams
try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "insert into user(username,password,email) valus(?,?,?)";$stmt = $pdo->prepare($sql);$stmt->bindParam(1,$username,PDO::PARAM_STR);$stmt->bindParam(2,$password,PDO::PARAM_STR);$stmt->bindParam(3,$email,PDO::PARAM_STR);$username = 'testParam';$password = 'testParamaaa';$email = 'testParambbb';$stmt->execute();echo '<pre>';$stmt->debugDumpParams();echo '</pre>';
} catch (PDOException $e) {echo $e->getMessage();
}
try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "select * from user where username=:username and password=:password";$stmt = $pdo->prepare($sql);$stmt->bindParam(':username',$username,PDO::PARAM_STR);$stmt->bindParam(':password',$password,PDO::PARAM_STR);$username = 'testParam';$password = 'testParamaaa';$stmt->execute();echo '<pre>';$stmt->debugDumpParams();echo '</pre>';
} catch (PDOException $e) {echo $e->getMessage();
}8. nextRowset()
创建存储过程：create procedure test1()
BEGINselect * from user;select * from qqlogin0;
END
try {$dsn = 'mysql:host=localhost;dbname=test';$pdo = new PDO($dsn,'root','123456');$sql = "call test1()";$stmt = $pdo->query($sql);$rowset = $stmt->fetchAll(PDO::FETCH_ASSOC);var_dump($rowset);echo '<br/>*****************第二个结果集*************<br/>';$stmt->nextRowset();$rowset2 = $stmt->fetchAll(PDO::FETCH_ASSOC);var_dump($rowset2);
} catch (PDOException $e) {echo $e->getMessage();
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