/**
* [_query 组合SQL语句 并调用query方法执行 query方法需要被实现]
* @param [type] $method [方法类型]
* @param string $id [主键ID 可选]
* @return [type] [array]
*/
protected function _query($method, $id = '', $use_mem = true)
{
if (is_int($id)) {
if (empty($this->db_sql['where'])) {
$this->db_sql['where'] = ' WHERE ' . $this->pk . '=' . $id;
} else {
$this->db_sql['where'] .= ' AND ' . $this->pk . '=' . $id;
}
} elseif (!empty($id)) {
$this->exception('该参数可选，但只能是整数！');
}
$sql = $method . ' ' . ($method == 'select' ? $this->db_sql['field'] : '') . ' FROM ' . $this->db_table . $this->parseSql();
/* 是否使用memcache */
if ($method == 'select' && defined('MEMCACHE') && MEMCACHE === true && $use_mem) {
$mem = new MemcacheModel();
if ($mem->check_connect()) {
$data = $mem->getCache($sql);
if ($data) {
return $data;
} else {
$result = $this->query($sql, $method);
$expire = defined('MEM_EXPIRE') ? MEM_EXPIRE : 180;
$mem->addCache($sql, $result, $expire);
return $result;
}
}
}
return $this->query($sql, $method);
}
