EJB3.0中查询boolean值的方法

我定义了一个类：HibernateBooleanDemo
    只有两个属性：id和enabled，分别是String和boolean类型，分别对应表中的id和isEnabled列。并编写了相应的get和set方法和DAO类。但是如下代码很奇怪：
    String hql = \"from HibernateBooleanDemo where isEnabled=false\";
    Session s = HibernateSessionFactory.getSession();
    Transaction t = s.beginTransaction();
    Query q = s.createQuery(hql);
    List list = q.list();
    System.out.println(list.size());
    System.out.println(((HibernateBooleanDemo)list.get(0)).isEnabled());
    t.commit();
    HibernateSessionFactory.closeSession();
    在上面的查询语句中写列名即isEnabled时可以正常运行。但是写属性enabled时，却抛出异常，大概意思是说不能解析该属性。
    一直不明白是什么原因。请大家指点
    【AmethystWish】:
    若\"from HibernateBooleanDemo where isEnabled=false\";写为\"from HibernateBooleanDemo where enabled=false\";错误如下：
    aused by: com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Unknown column \'enabled\' in \'where clause\'
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
    at com.mysql.jdbc.Connection.execSQL(Connection.java:3124)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1149)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1262)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:139)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1669)
    at org.hibernate.loader.Loader.doQuery(Loader.java:662)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
    at org.hibernate.loader.Loader.doList(Loader.java:2145)
    ... 8 more

    【liandti】:
    from HibernateBooleanDemo h where h.enabled=false
    如果用属性就加别名

    【AmethystWish】:
    查询字符串改为：\"from HibernateBooleanDemo h where h.enabled=false\";之后运行，结果如下：
    Exception in thread \"main\" org.hibernate.QueryException: could not resolve property: enabled of: org.acman.demo.HibernateBooleanDemo [from org.acman.demo.HibernateBooleanDemo h where h.enabled=false]
    at org.hibernate.persister.entity.AbstractPropertyMapping.throwPropertyException(AbstractPropertyMapping.java:43)[Page]
    at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:37)
    at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1265)
    at org.hibernate.hql.ast.tree.FromElementType.getPropertyType(FromElementType.java:279)
    at org.hibernate.hql.ast.tree.FromElement.getPropertyType(FromElement.java:372)
    at org.hibernate.hql.ast.tree.DotNode.getDataType(DotNode.java:539)
    at org.hibernate.hql.ast.tree.DotNode.prepareLhs(DotNode.java:221)
    at org.hibernate.hql.ast.tree.DotNode.resolve(DotNode.java:172)
    at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:94)
    at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:90)
    at org.hibernate.hql.ast.HqlSqlWalker.resolve(HqlSqlWalker.java:725)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1215)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4032)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3518)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:1758)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:776)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:577)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)

    【AmethystWish】:
    如果属性是其它类型的，如字符串类型的，运行就没有问题，如果是bool、boolean类型的就这样，不知道为什么。初学hibernante，应该有不知道的地方

    【AmethystWish】:
    已解决。错误总结：类映射文件中元素的name属性对应类中属性的名字,要以小写字母开头。我使用HibernateSynchronizer工具自动生成类映射文件，name属性全部以大写字母开头。

    但是很奇怪，其它类型的属性没有问题，只有布尔类型的有问题。

 

【责编:Ken】

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