I have two entities as below
Parent {
String parentID;
String parentName;
...
}
-
Child{
String parentID;
String childID;
Integer height;
....
}
Its a one to many relationship between the parent and the child.
My intention is have the below SQL.
SELECT p.parentID, p.parentName, c.childrenHeightRange
FROM
Parent p
INNER JOIN
(
SELECT parentID, (CASE WHEN (min(height) = max(height)) THEN cast(min(height) as varchar) ELSE cast(min(height) as varchar) + ' - ' + cast(max(height) as varchar) END) as childrenHeightRange
FROM Child GROUP BY parentID) as c
ON (p.parentID = c.parentID)
For above query, I used a CaseBuilder for childHeightRange as below
JPASubQuery subQuery = new JPASubQuery().from(child).groupBy(child.parentID);
Expression<String> heightCaseExpression = new CaseBuilder()
.when(child.height.min().eq(child.height.max()))
.then(child.height.min().stringValue())
.otherwise(child.height.min().stringValue() +"-"+child.height.max().stringValue())
.as("childrenHeightRange");
And then comes the big question..
I have
query.from(parent).innerjoin(subquery.list(child.parentID,heightCaseExpression )).on(parent.parentID.eq(child.parentID))
.list(parent.parentID,parent.parentName, ............);
How do i reference childrenHeightRange from the subquery?
Please help.
Thanks
在 Querydsl JPA 中,您只能在 where 部分使用子查询,因此您需要重新构建查询。
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