Hibernate抛出期待的OPEN,发现'+'

Question

下面有我的hql:

update User set count = count + ?2 where id = ?1

以下是例外情况:

org.hibernate.hql.internal.ast.QuerySyntaxException: expecting OPEN, found '+' near line 1, column 71 [update com.yitaosoft.edm.common.persist.entity.User set count = count + ? where id = ?]
    at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
    at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
    at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:79)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:278)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:182)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:138)

我想更新用户设置count = count + xx,其中id = xx.但得到了语法错误.为什么？是不是在hql中支持？怎么解决这个问题？

Answer 1

问题是fieldname计数; 这是一个保留字,应该引用.
Expected OPEN意味着HQL解析器期望count(<expression>)SQL表达式而不是count = ....唯一的解决方案是别名User并强制点名字段名为:

update User u set u.count = (u.count + ?) where id = ?

Answer 2

Query query = session.createQuery("update User set count = count + :count" +" where id = :Id");
query.setParameter("Id", id);
query.setParameter("count", count);