Hibernate Criteria Query-嵌套条件
我不知道如何使用Hibernate Criteria synthax创建这样的查询
select * from x where x.a = 'abc' and (x.b = 'def' or x.b = 'ghi')
您是否知道该怎么做?
我正在使用Hibernate Restriction静态方法,但不了解如何指定嵌套的“或”条件
回答:
您的特定查询可能是:
crit.add(Restrictions.eq("a", "abc"));crit.add(Restrictions.in("b", new String[] { "def", "ghi" });
如果您想了解一般的AND和OR,请执行以下操作:
// Use disjunction() or conjunction() if you need more than 2 expressionsDisjunction aOrBOrC = Restrictions.disjunction(); // A or B or C
aOrBOrC.add(Restrictions.eq("b", "a"));
aOrBOrC.add(Restrictions.eq("b", "b"));
aOrBOrC.add(Restrictions.eq("b", "c"));
// Use Restrictions.and() / or() if you only have 2 expressions
crit.add(Restrictions.and(Restrictions.eq("a", "abc"), aOrBOrC));
这等效于:
where x.a = 'abc' and (x.b = 'a' or x.b = 'b' or x.b = 'c')
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