Hibernate Create Criteria两次连接同一张表-尝试了2种方法，但有2个差异错误 [英] Hibernate Create Criteria to join the same table twice - tried 2 approach with 2 difference error

问题描述

我想为以下本地sql创建创建条件.

I would like to create create criteria for the following native sql.

不幸的是，我两次使用createCriteria时遇到重复的关联路径错误. 当我尝试使用Restrictions.sqlRestriction时.它无法提供我想要的SQL.

Unfortunately, I hit error of duplicate associate path when use createCriteria twice. When I try to use Restrictions.sqlRestriction. It unable provide the SQL that I want.

尝试1:创建条件-重复的关联路径

 Criteria criteria = getSession().createCriteria( Company.class );
                 criteria.createAlias( "customerCategories", "c1" );
                 criteria.add( Restrictions.in( "c1.customerCategory.customerCategoryId",
                         company.getBaseCustomerCategoryId() ) );
                 criteria.createAlias( "customerCategories", "c2" );
                 criteria.add( Restrictions.in( "c2.customerCategory.customerCategoryId",
                         company.getPromoCustomerCategoryId() ) );

尝试2:创建SQL限制-ORA-00920:由于位置"而导致的关系运算符无效

  Criteria criteria = getSession().createCriteria( Company.class );
                 criteria.add( Restrictions.sqlRestriction(
                         "INNER JOIN Company_Customercategory a on {alias}.companyId = a.companyId and a.CUSTOMERCATEGORYID = ?",
                         company.getBaseCustomerCategoryId(), LongType.INSTANCE ) );
                 criteria.add( Restrictions.sqlRestriction( 
                         "1=1 INNER JOIN Company_Customercategory b on {alias}.companyId = b.companyId
 and b.CUSTOMERCATEGORYID = ?", 
                         company.getPromoCustomerCategoryId(), LongType.INSTANCE) );

错误的结果

select this_.* from Companies this_ where 
  INNER JOIN Company_Customercategory a 
  on this_.companyId = a.companyId 
  and a.CUSTOMERCATEGORYID = 1
  and 1=1 INNER JOIN Company_Customercategory b 
  on this_.companyId = b.companyId 
  and b.CUSTOMERCATEGORYID = 6

期望的SQL

select * from companies c
  inner join Company_Customercategory a
  on c.companyId = a.companyId
  and a.CUSTOMERCATEGORYID = 1
  inner JOIN Company_Customercategory b
  on a.companyId = b.companyId
  and b.CUSTOMERCATEGORYID = 6

感谢您的帮助. 谢谢.

Appreciate your help. Thanks.

推荐答案

有一个旧的Hibernate错误 HHH-879 关于org.hibernate.QueryException: duplicate association path的问题，该问题在2005年仍在打开...

There is an old Hibernate bug HHH-879 on the problem of org.hibernate.QueryException: duplicate association path opened 2005 and still open...

其他问题已关闭，没有解决方法 HHH-7882

Other issue is closed without solution HHH-7882

所以选项1)不太合适.

So the option 1) is rather not suitable.

但是在上述错误的注释中，使用exists

But in the comments of the above bug an usefull workaround is mentioned using exists

因此，对exists使用两次sqlRestriction，并使用相关的子查询过滤propper类别.您只会获得同时连接到这两个类别的 companies .

So use twice sqlRestriction with exists and a correlated subquery filtering the propper category. You will get only companies connected to both categories.

crit.add( Restrictions.sqlRestriction( 
  "exists (select null from Company_Customercategory a where {alias}.company_Id = a.company_Id and a.CUSTOMERCATEGORYID = ?)",
  1, IntegerType.INSTANCE ) );
crit.add( Restrictions.sqlRestriction( 
  "exists (select null from Company_Customercategory a where {alias}.company_Id = a.company_Id and a.CUSTOMERCATEGORYID = ?)",
  6, IntegerType.INSTANCE ) );

这将导致以下查询提供正确的结果

This leads to the following query which provides the correct result

select this_.COMPANY_ID as COMPANY_ID1_2_0_, this_.COMPANY_NAME as COMPANY_NAME2_2_0_ 
from COMPANIES this_ 
where exists (select null from Company_Customercategory a 
              where this_.company_Id = a.company_Id and a.CUSTOMERCATEGORYID =  ?) and 
      exists (select null from Company_Customercategory a 
              where this_.company_Id = a.company_Id and a.CUSTOMERCATEGORYID = ?)

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