HQL CASE语句用法

Question

我正在使用HQL并拥有此查询

<query name="rule.myRule.query.by.name">
    <![CDATA[
        FROM rule.myRule as cr
        WHERE cr.name LIKE :name
        AND cr.type = 'myType'
        CASE 
            WHEN COUNT(cr.childRules) > 0
        THEN 
            cr.childRules LIKE :name
    ]]>
</query>

我需要一些帮助才能使此查询正确无误。我想要的是条件cr.childeRule LIKE：name只在cr.childRules＆gt; 0的计数时执行。

我哪里错了？

Answer 1

FROM rule.myRule as cr
left join cr.childRules childRule
WHERE cr.name LIKE :name
AND cr.type = 'myType'
and childRule.id is null or childRule.name = :name

应该做你想做的事。