Question

如何在grails中调用联接。这是我的Domain类：

package com.org.domain

class CoverageList {
    Integer id
    Integer pub_cat_id
    Integer brand_id
    Integer brand_set_no
    String cov_list_desc
    Date edit_date
    Date part_edit_date
    Integer category_id


    static constraints = {
    }

    static mapping = {
        table 'coverage_list'
        version false
        id column : 'COV_LIST_ID'
        pub_cat_id column : 'PUB_CATEGORY_ID'
        brand_id column : 'BRAND_ID'
        brand_set_no column : 'BRAND_SET_NO'
        cov_list_desc column : 'COV_LIST_DESC'
        edit_date column : 'EDIT_DATE'
        part_edit_date column : 'PART_EDIT_DATE'
        category_id column : 'CATEGORY_ID'
    }
}

package com.org.domain

class AssocCovList {
    Integer id
    Integer association_id
    Integer cov_list_id
    String assoc_line_code
    Date edit_date
    Date add_date

    static constraints = {
    }

    static mapping = {
        table 'assoc_cov_list'
        version false
        id column : 'ASSOC_COV_LIST_ID'
        association_id column : 'ASSOCIATION_ID'
        cov_list_id column : 'COV_LIST_ID'
        assoc_line_code column : 'ASSOC_LINE_COD'
        edit_date column : 'EDIT_DATE'
        add_date column : 'ADD_DATE'
    }
}

class Brand {
    Integer id
    String brand_name
    String aaia_brand_id
    String brand_owner_name
    String parent_company_name
    String site_link_code
    Date edit_date

    static hasMany = [cov_lists : CoverageList]

    static constraints = {
    }

    static mapping = {
        table 'brand'
        version false
        id column : 'BRAND_ID'
        brand_name column : 'BRAND_NAM'
        aaia_brand_id column : 'AAIA_BRAND_ID'
        brand_owner_name column : 'BRAND_OWNER_NAME'
        parent_company_name column : 'PARENT_COMPANY_NAME'
        site_link_code column : 'SITE_LINK_COD'
        edit_date column : 'EDIT_DATE'
    }
}

def cov_list = CoverageList.executeQuery
    ("SELECT c.id, c.cov_list_desc, b.brand_name, a.id, a.association_id, a.cov_list_id FROM CoverageList c LEFT JOIN AssocCovList a ON (c.id = a.cov_list_id AND a.association_id = 1) JOIN Brand b ON b.id= c.brand_id ORDER BY b.brand_name, c.cov_list_desc")

但是我得到这样的错误：

{ERROR} portal-web.docroot.html.portal.render_portlet.jsp org.hibernate.hql.ast.QuerySyntaxException: 
    unexpected token: ON near line 1, column 187 [SELECT c.id, c.cov_list_desc, b.brand_name, a.id, a.association_id, a.cov_list_id, a.assoc_line_code, a.edit_date, a.add_date FROM com.org.domain.CoverageList c LEFT JOIN AssocCovList a ON (c.id = a.cov_list_id AND a.association_id = 1) JOIN Brand b ON b.id= c.brand_id ORDER BY b.brand_name, c.cov_list_desc]

我出错了，请任何人帮助我。

感谢

Answer 1

您不能将LEFT JOIN用于2列。按以下方式重写您的查询： ... CoverageList c LEFT JOIN AssocCovList a ON（c.id = a.cov_list_id）WHERE a.association_id = 1

Answer 2

你最后的JOIN不应该是WHERE吗？我会在FROM子句中添加“Brand b”，并用“WHERE b.id = c.brand_id”替换最新的JOIN。

我没有测试......这只是一个想法...

Answer 3

您的代码看起来像Oracle SQL，但Grails使用Hibernate进行ORM。 Hibernate使用的Hibernate查询语言（HQL）似乎不支持连接后跟和ON子句。 HQL: The Hibernate Query Language

离开加入Grails

3 个答案: