/**
* 生成查询条件
*
* @return string
*/
protected function renderWhere()
{
if ($this->where === NULL) {
return '';
}
return 'where ' . $this->where->toString();
}
/**
* 生成文字表达的SQL语句
*
* orObject、andObject有可能共存，or优先，最好不要共存
*/
public function toString()
{
//获取自身对象代表的语句
$method = 'render' . ucfirst($this->type);
$whereString = '(' . $this->{$method}() . ')';
if ($this->andObject) {
if ($this->andHand == self::HAND_RIGHT) {
$whereString = '(' . $whereString . ' ' . self::WHERE_AND . ' ' . $this->andObject->toString() . ')';
} else {
$whereString = '(' . $this->andObject->toString() . ' ' . self::WHERE_AND . ' ' . $whereString . ')';
}
}
if ($this->orObject) {
if ($this->orHand == self::HAND_RIGHT) {
$whereString = '(' . $whereString . ' ' . self::WHERE_OR . ' ' . $this->orObject->toString() . ')';
} else {
$whereString = '(' . $this->orObject->toString() . ' ' . self::WHERE_OR . ' ' . $whereString . ')';
}
}
return $whereString;
}
