Question

我正在尝试使用Yii＆＃39; queryBuilder＆＃39;构建复杂的SQL查询 - 现有查询如下所示：

    $cmd->select('SUM(redeemedCodes.school_points) AS reportingTotalPoints, redeemedCodes.date_redeemed, redeemedCodes.inactive, redeemedCodes.subject_id);
    $cmd->from('redeemed_codes redeemedCodes');

任何人都可以解释如何修改SELECT以包含IF元素，如下所示： IF（orderProduct.subject_message_link = 1 AND orderProduct.message！=＆＃39;＆＃39;，CONCAT（subject.subject_name，＆＃39;＆＃39;，orderProduct.message），subject.subject_name）AS reportingSubjectName＆＃39 ;）

甚至可以使用Yii中的createCommand（）吗？

我正在尝试构建类似下面的查询：

SELECT redeemedCodes.user_id AS user_id, SUM(redeemedCodes.school_points) AS reportingTotalPoints, 
IF(orderProduct.subject_message_link = 1 AND orderProduct.message != '', CONCAT(subject.subject_name, ' ', orderProduct.message), subject.subject_name) AS reportingSubjectName 
FROM `redeemed_codes` `redeemedCodes`

Answer 1

未经测试：

我认为CDbExpression可能很方便。

$exp = new CDbExpression("IF(orderProduct.subject_message_link = 1 AND orderProduct.message != '', CONCAT(subject.subject_name, ' ', orderProduct.message), subject.subject_name)");

并在需要的地方使用$ exp来放置字符串。 e.g。

$sql = "Select *, " . $exp . " as ReportingSubjectName FROM ....";

Answer 2

你可以尝试这样的事情：

$sql = "SELECT redeemedCodes.user_id AS user_id, SUM(redeemedCodes.school_points) AS reportingTotalPoints,         redeemedCodes.date_redeemed, redeemedCodes.inactive, redeemedCodes.subject_id, IF(orderProduct.subject_message_link = 1 AND orderProduct.message != '', CONCAT(subject.subject_name, ' ', orderProduct.message), subject.subject_name) AS reportingSubjectName FROM `redeemed_codes` `redeemedCodes`";

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

Yii - 使用createCommand（）＆amp;的复杂查询如果（）

2 个答案: