Hibernate HQL中带有嵌套select的Case语句
我无法为此SQL(Oracle)创建HQL语句 HQL看起来更像是相同的。问题在于案例中的嵌套选择 错误:Hibernate HQL中带有嵌套select的Case语句,hibernate,hql,Hibernate,Hql,我无法为此SQL(Oracle)创建HQL语句 HQL看起来更像是相同的。问题在于案例中的嵌套选择 错误: java.lang.NullPointerException at org.hibernate.hql.ast.tree.CaseNode.getDataType(CaseNode.java:40) at org.hibernate.hql.ast.tree.SelectClause.initializeExplicitSelectClause(SelectClause.j
java.lang.NullPointerException
at org.hibernate.hql.ast.tree.CaseNode.getDataType(CaseNode.java:40)
at org.hibernate.hql.ast.tree.SelectClause.initializeExplicitSelectClause(SelectClause.java:165)
at org.hibernate.hql.ast.HqlSqlWalker.useSelectClause(HqlSqlWalker.java:831)
at org.hibernate.hql.ast.HqlSqlWalker.processQuery(HqlSqlWalker.java:619)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:672)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:288)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:231)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1651)
java.lang.NullPointerException
位于org.hibernate.hql.ast.tree.CaseNode.getDataType(CaseNode.java:40)
在org.hibernate.hql.ast.tree.SelectClause.initializeExplicitSelectClause(SelectClause.java:165)上
位于org.hibernate.hql.ast.HqlSqlWalker.useSelectClause(HqlSqlWalker.java:831)
位于org.hibernate.hql.ast.hqlslwalker.processQuery(hqlslwalker.java:619)
在org.hibernate.hql.antlr.HqlSqlBaseWalker.query(hqlsqlberwalker.java:672)
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:288)
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:231)
位于org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:254)
位于org.hibernate.hql.ast.QueryTranslatorImpl.docomfile(QueryTranslatorImpl.java:185)
位于org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
在org.hibernate.engine.query.HQLQueryPlan.(HQLQueryPlan.java:101)
在org.hibernate.engine.query.HQLQueryPlan.(HQLQueryPlan.java:80)
位于org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
位于org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
位于org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
位于org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1651)
对于99%,表1和表2映射位于上下文中
任何建议都将不胜感激。表1是否只有一条记录?如果否,则在案例中从中选择将不起作用,请尝试在表1和表2之间联接,如下所示:
SELECT
CASE WHEN Column1 = 'VALUE1' THEN (
COL2
) ELSE
Column3
END AS CASE1
FROM TABLE2 , Table1
WHERE Columnx = 'something that is unique'
如果需要连接表2、表3,那么不要忘记这样做,如果不这样做,这里将发生笛卡尔连接。我们可以看到HQL吗?您能否将表2作为查询的一部分连接到表1,并在hql中说:从表2中选择(当'VALUE1'时为case column1,然后是table1.col2 else column3 end)将Table2.table1连接为table1或类似内容?
SELECT
CASE WHEN Column1 = 'VALUE1' THEN (
COL2
) ELSE
Column3
END AS CASE1
FROM TABLE2 , Table1
WHERE Columnx = 'something that is unique'