<?php
// +----------------------------------------------------------------------
// | TOPThink [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2011 http://topthink.com All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace Traits\Think\Model;

trait Query {

    /**
     * 启动事务
     * @access public
     * @return void
     */
    public function startTrans() {
        $this->commit();
        $this->db->startTrans();
        return ;
    }

    /**
     * 提交事务
     * @access public
     * @return boolean
     */
    public function commit() {
        return $this->db->commit();
    }

    /**
     * 事务回滚
     * @access public
     * @return boolean
     */
    public function rollback() {
        return $this->db->rollback();
    }

    /**
     * SQL查询
     * @access public
     * @param string $sql  SQL指令
     * @param mixed $parse  是否需要解析SQL
     * @return mixed
     */
    public function query($sql,$parse=false) {
        if(!is_bool($parse) && !is_array($parse)) {
            $parse = func_get_args();
            array_shift($parse);
        }
        $sql  =   $this->parseSql($sql,$parse);
        return $this->db->query($sql);
    }

    /**
     * 执行SQL语句
     * @access public
     * @param string $sql  SQL指令
     * @param mixed $parse  是否需要解析SQL
     * @return false | integer
     */
    public function execute($sql,$parse=false) {
        if(!is_bool($parse) && !is_array($parse)) {
            $parse = func_get_args();
            array_shift($parse);
        }
        $sql  =   $this->parseSql($sql,$parse);
        return $this->db->execute($sql);
    }

    /**
     * 解析SQL语句
     * @access public
     * @param string $sql  SQL指令
     * @param boolean $parse  是否需要解析SQL
     * @return string
     */
    protected function parseSql($sql,$parse) {
        // 分析表达式
        if(true === $parse) {
            $options =  $this->_parseOptions();
            $sql  =   $this->db->parseSql($sql,$options);
        }elseif(is_array($parse)){ // SQL预处理
            $sql  = vsprintf($sql,$parse);
        }else{
            $sql    =   strtr($sql,['__TABLE__'=>$this->getTableName(),'__PREFIX__'=>$this->tablePrefix]);
        }
        return $sql;
    }

    /**
     * 批处理执行SQL语句
     * 批处理的指令都认为是execute操作
     * @access public
     * @param array $sql  SQL批处理指令
     * @return boolean
     */
    public function patchQuery($sql=[]) {
        if(!is_array($sql)) return false;
        // 自动启动事务支持
        $this->startTrans();
        try{
            foreach ($sql as $_sql){
                $result   =  $this->execute($_sql);
                if(false === $result) {
                    // 发生错误自动回滚事务
                    $this->rollback();
                    return false;
                }
            }
            // 提交事务
            $this->commit();
        } catch (\Think\Exception $e) {
            $this->rollback();
        }
        return true;
    }    
}