Db::parseThinkWhere PHP Method

    protected function parseThinkWhere($key, $val)
    {
        $whereStr = '';
        switch ($key) {
            case '_string':
                // 字符串模式查询条件
                $whereStr = $val;
                break;
            case '_complex':
                // 复合查询条件
                $whereStr = substr($this->parseWhere($val), 6);
                break;
            case '_query':
                // 字符串模式查询条件
                parse_str($val, $where);
                if (array_key_exists('_logic', $where)) {
                    $op = ' ' . strtoupper($where['_logic']) . ' ';
                    unset($where['_logic']);
                } else {
                    $op = ' AND ';
                }
                $array = array();
                foreach ($where as $field => $data) {
                    $array[] = $this->addSpecialChar($field) . ' = ' . $this->parseValue($data);
                }
                $whereStr = implode($op, $array);
                break;
        }
        return $whereStr;
    }