104 lines
1.8 KiB
PHP
104 lines
1.8 KiB
PHP
<?php
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class Db
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{
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/**
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* 数据查询实例
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* @var null
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*/
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public static $Db = null;
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private static function _init()
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{
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if(!self::$Db)
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self::$Db = new BaseMethod();
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}
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/**
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* 查询方法，返回单条数据
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* @param $sql
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* @param array $arr
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* @return mixed
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* @throws \Exception
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*/
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public static function query($sql, $arr = [])
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{
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self::_init();
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$result = self::$Db->PDO_Request($sql, $arr);
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if(!self::$Db->PDO_IsDone())
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throw new Exception(self::$Db->GetErrorInfo(), 101);
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if(isset($result[0]))
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return $result[0];
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return false;
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}
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/**
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* 查询方法，返回多条数据
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* @param $sql
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* @param $arr
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* @return array
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* @throws \Exception
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*/
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public static function queryAll($sql, $arr = [])
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{
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self::_init();
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$result = self::$Db->PDO_Request($sql, $arr);
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if(!self::$Db->PDO_IsDone())
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throw new Exception(self::$Db->GetErrorInfo(), 102);
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return $result;
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}
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/**
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* 只执行sql语句，不反回结果
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* @param $sql
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* @param array $arr
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* @return bool
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* @throws \Exception
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*/
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public static function execute($sql, $arr = [])
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{
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self::_init();
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$ret = self::$Db->PDO_Execute($sql, $arr);
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if(!$ret || !self::$Db->PDO_IsDone())
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throw new \Exception(self::$Db->GetErrorInfo(), 103);
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return true;
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}
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/**
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* 开启事务
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*/
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public static function beginTransaction()
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{
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self::_init();
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self::$Db->PDO_BeginTransaction();
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}
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/**
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* 提交一个事务
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*/
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public static function commit()
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{
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self::$Db->PDO_Commit();
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}
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/**
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* 回滚一个事务
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*/
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public static function rollBack()
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{
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self::$Db->PDO_Rollback();
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}
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} |