Question

我们如何构建Spring JPA查询并检索嵌套的Couchbase文档值的数据？我试图避免编写本机查询，而是使用JPA方法基于嵌套2个级别的键来检索数据。

Couchbase文档值是类型 Company 员工是一个列表，而任务是员工下的一个属性，员工是一个以详细信息为对象的列表

我想查询多个文档并按categoryId检索匹配的记录。

将存储库接口扩展到传递Company和文档ID的CouchbaseRepository。我已经尝试过

// finding by Employees-->Tasks-->Details-->CategoryId 
findByEmployeesTasksDetailsCategoryId(Integer id); // Does not work

但不起作用

"company": "Xyc",
"employees": {
   "name": "John Smith",
   "age": 24,
   "tasks": [
       {
            "id": 231,
            "date": "05-13-2019"
            "details": {
                    "categoryName": "Software",
                    "categoryId": 12,     
                    "description": "Buy Software"
                    "location": "Plano, Texas"
                    "zip": 75024
                }
            }
        },
       {
            "id": 789,
            "date": "05-14-2019"
            "details": {
                    "categoryName": "Hardware",
                    "categoryId": 17,     
                    "description": "Buy hardware"
                    "location": "Irving, Texas"
                    "zip": 75038
                }
            }
        },
        {
              "id": 456,
              "date": "05-15-2019"
               "details": {
                    "categoryName": "Hardware",
                    "categoryId": 17,     
                    "description": "Buy hardware"
                    "location": "Plano, Texas"
                    "zip": 75024
                 }
        }
    ]
}

我正在寻找JPA方法，在这里我可以通过categoryId获得详细信息任务或详细信息。

categoryId 17的预期输出

[
   {
      "categoryName": "Hardware",
      "categoryId": 17,     
      "description": "Buy keyboard and mouse"
      "location": "Irving, Texas"
      "zip": 75038
   },
   {
      "categoryName": "Hardware",
      "categoryId": 17,     
      "description": "Buy monitor"
      "location": "Plano, Texas"
      "zip": 75024
   }

]

Answer 1

您不能使用Spring Data查询嵌套实体，因为它不是原始Spring Data规范的一部分。但是，您只需使用 @Query 批注

编写N1QL查询

例如：

    @Query("#{#n1ql.selectEntity} where #{#n1ql.filter} and companyId = $1 and " +
        " removed = $2 and lower(name) like $3 order by lower(name) asc LIMIT $4 OFFSET  $5 ")
    List<FamilyResource> listFamilies(String companyId, boolean removed, String name, int limit, int offset);

您可以使用UNNEST https://docs.couchbase.com/server/6.0/n1ql/n1ql-language-reference/unnest.html

如何将Spring JPA用于Couchbase嵌套文档值

1 个答案: