From: http://www.bubuko.com/infodetail-777418.html
1、数据库配置Applications/XXX/Config/Db.php
<?php
namespace Config;
/**
* mysql配置
* @author walkor
*/
class Db
{
/**
* 数据库的一个实例配置,则使用时像下面这样使用
* $user_array = Db::instance(‘user‘)->select(‘name,age‘)->from(‘users‘)->where(‘age>12‘)->query();
* 等价于
* $user_array = Db::instance(‘user‘)->query(‘SELECT `name`,`age` FROM `users` WHERE `age`>12‘);
* @var array
*/
public static $user = array(
‘host‘ => ‘127.0.0.1‘,
‘port‘ => 3306,
‘user‘ => ‘your_user_name‘,
‘password‘ => ‘your_password‘,
‘dbname‘ => ‘user‘,
‘charset‘ => ‘utf8‘,
);
}
2、Applications/XXX/Event.php
<?php
use \GatewayWorker\Lib\Gateway;
use \GatewayWorker\Lib\Db;
/**
* 数据库示例,假设有个user库,里面有个user表
*/
class Event
{
/**
* 有消息时触发该方法,根据发来的命令打印2个用户信息
* @param int $client_id 发消息的client_id
* @param string $message 消息
* @return void
*/
public static function onMessage($client_id, $message)
{
// 发来的消息
$commend = trim($message);
if($commend !== ‘get_user_list‘)
{
Gateway::sendToClient($client_id, "unknown commend\n");
return;
}
// 获取用户列表(这里是临时的一个测试数据库)
$ret = Db::instance(‘user‘)->select(‘*‘)->from(‘users‘)->where(‘uid>3‘)->offset(5)->limit(2)->query();
// 打印结果
return Gateway::sendToClient($client_id, var_export($ret, true));
}
}
数据库类使用的一些示例
配置
在Config/Db.php中配置数据库信息,如果有多个数据库,可以在Db.php中配置多个实例 例如下面配置了两个数据库实例
<?php
namespace Config;
class Db
{
// 数据库实例1
public static $db1 = array(
‘host‘ => ‘127.0.0.1‘,
‘port‘ => 3306,
‘user‘ => ‘mysql_user‘,
‘password‘ => ‘mysql_password‘,
‘dbname‘ => ‘db1‘,
‘charset‘ => ‘utf8‘,
);
// 数据库实例2
public static $db2 = array(
‘host‘ => ‘127.0.0.1‘,
‘port‘ => 3306,
‘user‘ => ‘mysql_user‘,
‘password‘ => ‘mysql_password‘,
‘dbname‘ => ‘db2‘,
‘charset‘ => ‘utf8‘,
);
}
使用方法
use \GatewayWorker\Lib\Db;
$db1 = Db::instance(‘db1‘);
$db2 = Db::instance(‘db2‘);
// 获取所有数据
$db1->select(‘ID,Sex‘)->from(‘Persons‘)->where(‘sex= :sex‘)->bindValues(array(‘sex‘=>‘M‘))->query();
//等价于
$db1->select(‘ID,Sex‘)->from(‘Persons‘)->where("sex= ‘F‘ ")->query();
//等价于
$db1->query("SELECT ID,Sex FROM `Persons` WHERE sex=‘M’");
// 获取一行数据
$db1->select(‘ID,Sex‘)->from(‘Persons‘)->where(‘sex= :sex‘)->bindValues(array(‘sex‘=>‘M‘))->row();
//等价于
$db1->select(‘ID,Sex‘)->from(‘Persons‘)->where("sex= ‘F‘ ")->row();
//等价于
$db1->row("SELECT ID,Sex FROM `Persons` WHERE sex=‘M’");
// 获取一列数据
$db1->select(‘ID‘)->from(‘Persons‘)->where(‘sex= :sex‘)->bindValues(array(‘sex‘=>‘M‘))->column();
//等价于
$db1->select(‘ID‘)->from(‘Persons‘)->where("sex= ‘F‘ ")->column();
//等价于
$db1->column("SELECT `ID` FROM `Persons` WHERE sex=‘M’");
// 获取单个值
$db1->select(‘ID,Sex‘)->from(‘Persons‘)->where(‘sex= :sex‘)->bindValues(array(‘sex‘=>‘M‘))->single();
//等价于
$db1->select(‘ID,Sex‘)->from(‘Persons‘)->where("sex= ‘F‘ ")->single();
//等价于
$db1->single("SELECT ID,Sex FROM `Persons` WHERE sex=‘M‘");
// 复杂查询
$db1->select(‘*‘)->from(‘table1‘)->innerJoin(‘table2‘,‘table1.uid = table2.uid‘)->where(‘age > :age‘)->groupBy(array(‘aid‘))->having(‘foo="foo"‘)->orderBy(array(‘did‘))->limit(10)->offset(20)->bindValues(arra
y(‘age‘ => 13));
// 等价于
$db1->query(SELECT * FROM `table1` INNER JOIN `table2` ON `table1`.`uid` = `table2`.`uid` WHERE age > 13 GROUP BY aid HAVING foo="foo" ORDER BY did LIMIT 10 OFFSET 20“);
// 插入
$insert_id = $db1->insert(‘Persons‘)->cols(array(‘Firstname‘=>‘abc‘, ‘Lastname‘=>‘efg‘, ‘Sex‘=>‘M‘, ‘Age‘=>13))->query();
等价于
$insert_id = $db1->query("INSERT INTO `Persons` ( `Firstname`,`Lastname`,`Sex`,`Age`) VALUES ( ‘abc‘, ‘efg‘, ‘M‘, 13)");
// 更新
$row_count = $db1->update(‘Persons‘)->cols(array(‘sex‘))->where(‘ID=1‘)->bindValue(‘sex‘, ‘F‘)->query();
// 等价于
$row_count = $db1->update(‘Persons‘)->cols(array(‘sex‘=>‘F‘))->where(‘ID=1‘)->query();
// 等价于
$row_count = $db1->query("UPDATE `Persons` SET `sex` = ‘F‘ WHERE ID=1");
// 删除
$row_count = $db1->delete(‘Persons‘)->where(‘ID=9‘)->query();
// 等价于
$row_count = $db1->query("DELETE FROM `Persons` WHERE ID=9");