1、连接数据库方法：
<?php//方法1$mysqli = new mysqli("localhost", "root", "root", "easyadmin");if (!$mysqli) { echo "database error";} else { echo "php env successful";}$mysqli->close();
//方法2try { $dbh = new PDO(‘mysql:host=localhost;dbname=easyadmin‘, ‘root‘, ‘root‘, array(PDO::ATTR_PERSISTENT => true)); //持久性连接 $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $dbh->exec(‘SET CHARACTER SET utf8‘); echo "连接成功"; echo "<br/>"; /* 1.断开连接*/ //$dbh = null; $name = ‘kevin2%‘; /* 2.查询：sql语句中user与name不能是单引号‘’,是左上角的波浪线~,sql语句以外的可以是单引号，否则查询语句会报错*/ $sql = "select * from `user` where `name` like :name"; $stmt = $dbh->prepare($sql); $stmt->execute(array(‘:name‘ => $name)); while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { print_r($row); echo("<br/>"); }// /*3.添加*/// $sql = "INSERT INTO `user` (`name` ,`password`)VALUES (:name, :password)";// $stmt = $dbh->prepare($sql);// $stmt->execute(array(‘:name‘ => ‘kevin2‘, ‘:password‘ => ‘123459‘));// echo $dbh->lastInsertId();
/*4.删除*/ $name = "zj"; $sql = "delete from `user` where `name` like :name"; $stmt = $dbh->prepare($sql); $stmt->execute(array(‘:name‘ => $name)); echo $stmt->rowCount();
/*5.修改*/ $id = 3; $sql = "update `user` set `password`=:password where `id`=:id "; $stmt = $dbh->prepare($sql); $stmt->execute(array(‘:id‘ => $id, ‘:password‘ => ‘testabc‘)); echo "Update：" . $stmt->rowCount();
} catch (PDOException $ex) { print"Error!:" . $ex->getMessage() . "<br/>"; die();}
?>
2.参数绑定举例： $stmt = $dbh->prepare($sql); $stmt->bindParam(‘:country‘, $country, PDO::PARAM_STR); $stmt->execute();
3.事务
try {
$dbh = new PDO(‘mysql:host=localhost;dbname=test‘, ‘root‘, ‘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();
}
4.foreach语句
<?php
$dbh->query($sql); 当$sql 中变量可以用$dbh->quote($params); //转义字符串的数据
$sql = ‘Select * from city where CountryCode =‘.$dbh->quote($country); //引用
foreach ($dbh->query($sql) as $row) {
print $row[‘Name‘] . "/t";
print $row[‘CountryCode‘] . "/t";
print $row[‘Population‘] . "/n";
}
?>