Question

我在使用Criteria params和table别名时遇到问题。我需要得到这个查询：

SELECT x.* FROM stl_election x
JOIN (SELECT agent_id, economy_id, MAX(outcome) max_outcome FROM stl_election WHERE economy_id = 92 AND agent_id = 6203 GROUP BY stl_election.economy_id) y
ON y.max_outcome-3 <= x.outcome
AND y.economy_id = x.economy_id
AND y.agent_id = x.agent_id

我已经做到了：

$election = StlElection::model();
    $criteria = new CDbCriteria;
        $criteria->select = "agent_id, economy_id, MAX(outcome) max_outcome";
        $criteria->condition = 'agent_id=:agent_id AND economy_id=:economy_id';
        $criteria->params = array(
            ':agent_id' => $agent->id,
            ':economy_id' => $this->economy->id
        );
        $criteria->group = 'stl_election.economy_id';


        $bestChoiceSql = $election->getCommandBuilder()->createFindCommand($election->getTableSchema(), $criteria)->getText();

        $criteria2 = new CDbCriteria;

        $criteria2->join = '(' . $bestChoiceSql . ') y ON y.max_outcome-3 <= x.outcome
    AND y.economy_id = x.economy_id
AND y.agent_id = x.agent_id';
$criteria2->alias = 'x';

        $considerChoices = StlElection::model()->findAll($criteria2);

输出结果为：

Invalid parameter number: no parameters were bound. The SQL statement executed was: SELECT `t`.`agent_id`, `t`.`party_id`, `t`.`economy_id`, `t`.`outcome` FROM `stl_election` `t` (SELECT agent_id, economy_id, MAX(outcome) max_outcome FROM `stl_election` `t` WHERE agent_id=:agent_id AND economy_id=:economy_id GROUP BY stl_election.economy_id) y ON y.max_outcome-3 <= x.outcome
AND y.economy_id = x.economy_id
AND y.agent_id = x.agent_id

Answer 1

在我看来，你是从SQL的角度来看这个，而不是Yii的观点。我建议你学习模型关系和CDbCriteria的功能。

注意，对于CDbCriteria，如果您打算使用 - ＆gt; with（）函数，那么一定要包括 - ＆gt; together = true;

Yii CDbCriteria Class Reference

您的简单答案可能只是执行SQL查询，请尝试：

$query = "SELECT x.* FROM stl_election x
JOIN (SELECT agent_id, economy_id, MAX(outcome) max_outcome FROM stl_election WHERE economy_id = 92 AND agent_id = 6203 GROUP BY stl_election.economy_id) y
ON y.max_outcome-3 <= x.outcome
AND y.economy_id = x.economy_id
AND y.agent_id = x.agent_id";

$result = Yii::app()->db->createCommand($sql)->queryAll();

Answer 2

如果有人有兴趣回答：

$election = StlElection::model();
    $criteria = new CDbCriteria;
        $criteria->select = "agent_id, economy_id, MAX(outcome) max_outcome";
        $criteria->condition = 'agent_id=:agent_id AND economy_id=:economy_id';
        $criteria->params = array(
            ':agent_id' => $agent->id,
            ':economy_id' => $this->economy->id
        );
        $criteria->group = 'stl_election.economy_id';


        $bestChoiceSql = $election->getCommandBuilder()->createFindCommand($election->getTableSchema(), $criteria)->getText();

        $criteria2 = new CDbCriteria;

        $criteria2->join = 'JOIN (' . $bestChoiceSql . ') y ON y.max_outcome-3 <= x.outcome
    AND y.economy_id = x.economy_id
AND y.agent_id = x.agent_id';
$criteria2->alias = 'x';

        $considerChoices = StlElection::model()->findAll($criteria2);

我错过了'加入' - ＆gt;加入：/

Yii加入子查询，如何添加参数？

2 个答案: