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在我的项目中,我使用 Hibernate 3.6.4.Final 和自定义 sql 方言:
public class ServiceAppMySQL5InnoDBDialect extends MySQL5InnoDBDialect {
public ServiceAppMySQL5InnoDBDialect() {
super();
registerFunction("bitwise_and", new SQLFunctionTemplate(StandardBasicTypes.INTEGER, "(?1 & ?2)"));
registerFunction("hasflags", new SQLFunctionTemplate(StandardBasicTypes.BOOLEAN, "?1 & ?2 = ?2"));
}
}
使用hasflags
HQL 查询中的方法失败。
这是查询:
Query q = em
.createQuery(
"SELECT o FROM "
+ entityClass.getName()
+ " o WHERE hasflags(o.status, :status) AND o.email = :email")
.setParameter("email", username)
.setParameter("status", status.getBitmask());
错误:
Caused by: org.hibernate.hql.ast.QuerySyntaxException: unexpected AST node: ( near line 1, column 50 [SELECT o FROM tv.px.domain.Owner o WHERE hasflags(o.status, :status) AND o.email = :email]
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:82)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:261)
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:124)
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:1770)
at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:272)
因此,该函数似乎未正确注册。我已经用较旧的 Hibernate 版本做过几次这样的操作,并且一直都是这样工作的。
以防万一有人问这个:是的,我将 Hibernate 配置为使用方言:
<persistence-unit name="persistenceUnit"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<property name="hibernate.dialect" value="tv.px.persistence.hibernate.ServiceAppMySQL5InnoDBDialect" />
<!-- and so on -->
</properties>
</persistence-unit>
编辑:在 SELECT 子句中我可以毫无问题地使用注册函数,但不能在 WHERE 子句中使用。