java Hibernate 分离查询作为标准查询的一部分
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Hibernate detached queries as a part of the criteria query
提问by user199471
java experts can you please help me write detached queries as a part of the criteria query for the following SQL statement.
Java 专家能否请您帮我编写分离的查询，作为以下 SQL 语句的标准查询的一部分。
select A.*
FROM AETABLE A
where not exists
(
select entryid
FROM AETABLE B
where B.classpk = A.classpk
and B.userid = A.userid
and B.modifiedDate > A.modifiedDate
)
and userid = 10146
回答by ChssPly76
You need to write a correlated subquery. Assuming property / class names match column / table names above:
您需要编写一个相关的子查询。假设属性/类名称匹配上面的列/表名称：
DetachedCriteria subquery = DetachedCriteria.forClass(AETable.class, "b")
.add(Property.forName("b.classpk").eqProperty("a.classpk"))
.add(Property.forName("b.userid").eqProperty("a.userid"))
.add(Property.forName("b.modifiedDate").gtProperty("a.modifiedDate"));
Criteria criteria = session.createCriteria(AETable.class, "a")
.add(Property.forName("userid").eq(new Integer(10146)))
.add(Subqueries.notExists(subquery);
回答by Moody
Just one addition to the above query. If the entryid is not the primary key, then you'll need to add projection.
只是对上述查询的一个补充。如果 entryid 不是主键，那么您需要添加投影。
DetachedCriteria subquery = DetachedCriteria.forClass(AETable.class, "b")
.add(Property.forName("b.classpk").eqProperty("a.classpk"))
.add(Property.forName("b.userid").eqProperty("a.userid"))
.add(Property.forName("b.modifiedDate").gtProperty("a.modifiedDate"))
.add(setProjection(Projections.property("entryId")); // Additional projection property
Criteria criteria = session.createCriteria(AETable.class, "a")
.add(Property.forName("userid").eq(new Integer(10146)))
.add(Subqueries.notExists(subquery);
