php mysql PDO 查詢操作的實例詳解
<?php
$dbh = new PDO('mysql:host=localhost;dbname=access_control', 'root', '');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$dbh->exec('set names utf8');
/*添加*/
//$sql = "INSERT INTO `user` SET `login`=:login AND `password`=:password";
$sql = "INSERT INTO `user` (`login` ,`password`)VALUES (:login, :password)"; $stmt = $dbh->prepare($sql); $stmt->execute(array(':login'=>'kevin2',':password'=>''));
echo $dbh->lastinsertid();
/*修改*/
$sql = "UPDATE `user` SET `password`=:password WHERE `user_id`=:userId";
$stmt = $dbh->prepare($sql);
$stmt->execute(array(':userId'=>'7', ':password'=>'4607e782c4d86fd5364d7e4508bb10d9'));
echo $stmt->rowCount();
/*刪除*/
$sql = "DELETE FROM `user` WHERE `login` LIKE 'kevin_'"; //kevin%
$stmt = $dbh->prepare($sql);
$stmt->execute();
echo $stmt->rowCount();
/*查詢*/
$login = 'kevin%';
$sql = "SELECT * FROM `user` WHERE `login` LIKE :login";
$stmt = $dbh->prepare($sql);
$stmt->execute(array(':login'=>$login));
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
print_r($row);
}
print_r( $stmt->fetchAll(PDO::FETCH_ASSOC));
?>
1 建立連接
<?php
$dbh=newPDO('mysql:host=localhost;port=3306; dbname=test',$user,$pass,array(
PDO::ATTR_PERSISTENT=>true
));
?>
持久性鏈接PDO::ATTR_PERSISTENT=>true
2. 捕捉錯誤
<?php
try{
$dbh=newPDO('mysql:host=localhost;dbname=test',$user,$pass);
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$dbh->exec("SET CHARACTER SET utf8");
$dbh=null; //斷開連接
}catch(PDOException$e){
print"Error!:".$e->getMessage()."<br/>";
die();
}
?>
3. 事務的
<?php
try{
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$dbh->beginTransaction();//開啟事務
$dbh->exec("insertintostaff(id,first,last)values(23,'Joe','Bloggs')");
$dbh->exec("insertintosalarychange(id,amount,changedate)
values(23,50000,NOW())");
$dbh->commit();//提交事務
}catch(Exception$e){
$dbh->rollBack();//錯誤回滾
echo"Failed:".$e->getMessage();
}
?>
4. 錯誤處理
a. 靜默模式(默認模式)
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_SILENT); //不顯示錯誤 $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);//顯示警告錯誤，并繼續執行 $dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);//產生致命錯誤，PDOException
<?php
try{
$dbh = new PDO($dsn, $user, $password);
$sql = 'Select * from city where CountryCode =:country';
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
$stmt = $dbh->prepare($sql);
$stmt->bindParam(':country', $country, PDO::PARAM_STR);
$stmt->execute();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
print $row['Name'] . "/t";
}
} // if there is a problem we can handle it here
catch (PDOException $e) {
echo 'PDO Exception Caught. ';
echo 'Error with the database: <br />';
echo 'SQL Query: ', $sql;
echo 'Error: ' . $e->getMessage();
}
?>
1. 使用 query()
<?php
$dbh->query($sql); 當$sql 中變量可以用$dbh->quote($params); //轉義字符串的數據
$sql = 'Select * from city where CountryCode ='.$dbh->quote($country);
foreach ($dbh->query($sql) as $row) {
print $row['Name'] . "/t";
print $row['CountryCode'] . "/t";
print $row['Population'] . "/n";
}
?>
2. 使用 prepare, bindParam和 execute [建議用,同時可以用添加、修改、刪除]
<?php $dbh->prepare($sql); 產生了個PDOStatement對象 PDOStatement->bindParam() PDOStatement->execute();//可以在這里放綁定的相應變量 ?>
3. 事物
<?php
try {
$dbh = new PDO('mysql:host=localhost;dbname=test', 'root', '');
$dbh->query('set names utf8;');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$dbh->beginTransaction();
$dbh->exec("Insert INTO `test`.`table` (`name` ,`age`)VALUES ('mick', 22);");
$dbh->exec("Insert INTO `test`.`table` (`name` ,`age`)VALUES ('lily', 29);");
$dbh->exec("Insert INTO `test`.`table` (`name` ,`age`)VALUES ('susan', 21);");
$dbh->commit();
} catch (Exception $e) {
$dbh->rollBack();
echo "Failed: " . $e->getMessage();
}
?>
PDO常用方法：
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