SQL在玩游戏！框架

Question

我有以下这在SQL软件（HeidiSQL）完美运行SQL

SELECT gl2.documentNumber, gl2.debitAmount, gl2.creditAmount, 
gl2.account, gl2.description FROM GeneralLedger AS gl1 
LEFT JOIN GeneralLedger AS gl2 
ON gl1.documentNumber = gl2.documentNumber 
WHERE gl1.account='911' AND gl2.account <> '911'; 

当将其放置进场！控制器，我用这个：

 String queryPL = "SELECT gl2.documentNumber, gl2.debitAmount, gl2.creditAmount, " 
      + "gl2.account, gl2.description FROM GeneralLedger AS gl1 " 
      + "LEFT JOIN GeneralLedger AS gl2 " 
      + "ON gl1.documentNumber = gl2.documentNumber " 
      + "WHERE gl1.account='911' AND gl2.account <> '911'"; 
    Query query = JPA.em().createQuery(queryPL); 
    List<Object[]> profitAndLoss = query.getResultList(); 

接收的错误：

IllegalArgumentException occured : org.hibernate.hql.ast.QuerySyntaxException: unexpected token: ON near line 1, column 156 [SELECT gl2.documentNumber, gl2.debitAmount, gl2.creditAmount, gl2.account, gl2.description FROM models.GeneralLedger AS gl1 LEFT JOIN GeneralLedger AS gl2 ON gl1.documentNumber = gl2.documentNumber WHERE gl1.account='911' AND gl2.account <> '911']

我修改了HQL到

String queryPL = "SELECT gl2.documentNumber, gl2.debitAmount, gl2.creditAmount, " 
       + "gl2.account, gl2.description FROM models.GeneralLedger AS gl1 " 
       + "LEFT OUTER JOIN models.GeneralLedger AS gl2 " 
       + "WITH gl1.documentNumber = gl2.documentNumber " 
       + "WHERE gl1.account='911' AND gl2.account <> '911'"; 
     Query query = JPA.em().createQuery(queryPL); 
     List<Object[]> profitAndLoss = query.getResultList(); 

，仍然收到错误：

IllegalStateException occured : DOT node with no left-hand-side!

所以我该如何解决这个问题？

Answer 1

为了能够在HQL中的两个实体之间建立连接，您需要在这两个实体之间建立关联。在任何情况下，你都不能在两个不相关的实体之间进行连接，就像你可以在SQL中一样。在Hibernate documentation中详细描述了HQL及其加入功能。

如果您确实需要这种类型的联接，请使用本机查询。