使用Spring Data MongodB更新嵌入式mongodb文档中的数组字段?

时间:2016-08-11 11:40:52

标签: mongodb spring-data-mongodb bson mongotemplate

我正在尝试使用Spring Data MongoDB更新mongodb中嵌入文档中的数组字段。

我想在mongodb集合中更新/插入的文档结构如下。

根据部门的每种类型,可以有更多类似的文件,例如"销售","营销"等等。

{
    "timestamp": "2014-09-26T04:00:00.000Z",
    "department": "accounts",
    "employee": [
        {
            "type": "regular",
            "names": [
                "Raj",
                "Kumar",
                "Shankar"
            ]
        },
        {
            "type": "contract",
            "names": [
                "Penny",
                "Sheldon",
                "bob"
            ]
        },
        {
            "type": "temp",
            "names": [
                "jerry",
                "kramer",
                "bubbleboy"
            ]
        }
    ]
}

基本上,我的更新查询如下,

db.getCollection('mytest').update(
   { 
        "timestamp" : "2014-09-26T04:00:00.000Z",
        "department" : "accounts",
        "employee.type" : "regular"
    },
    { $addToSet: { "employee.$.names" : "Jo" } },
    {
        upsert: true
    }
)

我添加了upsert:true,因为如果没有匹配查询的文档,我想将文档插入到mytest集合中。

当我从mongo shell执行相同操作时,我收到以下错误。

   The positional operator did not find the match needed from the query. Unexpanded update: employee.$.names

即使这样有效,我也不确定我们是否有类似的支持在Spring Data mongodb中实现相同的功能。

另外,我的另一个问题是,如果我想为多个部门添加/更新员工,请说" accounts"以及" sales",似乎我必须执行相同的查询,使用不同的值作为我想要更新的部门数(如果不存在插入)。

是否有更好,更高效的选项,如批量/批处理,我可以在单个mongo更新查询中同时更新/插入多个部门的员工。另外,在弹簧数据中是否支持mongodb / mongotemplate。

1 个答案:

答案 0 :(得分:1)

首先,我应该说,由于文档结构具有嵌入式数组,因此需要处理多个场景。如果可能,请尝试重新设计文档结构。

对错误的简短回答: - 如果查询找不到匹配的文档,则会出现位置运算符错误。

这就是为什么在我的下面的解决方案中,我已经处理了catch块中的场景。如果你可以通过单元测试,你应该能够理解。

<强>解决方案: -

public Boolean updateDepartmentCollectionWithoutFind(String name, String timeStamp)
            throws JsonParseException, JsonMappingException, IOException {

        MongoOperations mongoOperations = getMongoConnection();

        Query query = new Query();
        query.addCriteria(Criteria.where("timestamp").is(timeStamp).and("department").is("accounts")
                .and("employee.type").is("regular"));
        Update update = new Update();
        update.addToSet("employee.$.names", name);

        try {

            System.out.println(query.toString());
            System.out.println(update.toString());

            WriteResult writeResult = mongoOperations.upsert(query, update, DepartmentCollection.class);

            if (writeResult != null) {

                System.out.println("111111111111111111 Update with position parameter has been successful :"
                        + writeResult.toString());

            }
        } catch (DataIntegrityViolationException die) {
            System.out.println("Update failed ====>" + die.getMessage());
            System.out.println("Trying to update without position parameters ...");

            Update updateWithoutPositionOperator = new Update();
            updateWithoutPositionOperator.addToSet("employee.names", name);
            WriteResult writeResultUpsert = mongoOperations.upsert(query, updateWithoutPositionOperator,
                    DepartmentCollection.class);

            if (writeResultUpsert != null) {

                System.out.println("2222222222222222222 Update without position parameter has been successful :"
                        + writeResultUpsert.toString());

            }

        }

        return true;

    }

我的连接方法供参考: - 如果您有弹簧上下文并且可以根据您的上下文更改上述代码,那么您不需要这样做。

@SuppressWarnings("resource")
public MongoOperations getMongoConnection() {

    return (MongoOperations) new AnnotationConfigApplicationContext(SpringMongoConfig.class)
            .getBean("mongoTemplate");
}

单元测试: - 我发布了单元测试,因为您需要了解方案和解决方案。请阅读每个测试和方法名称中的注释,以了解在每个方案中执行哪个upsert。

测试3 是一种特殊行为。请仔细看看。

@Test
    public void updateDepartmentCollectionWhenNoDocumentsPresent() throws JsonParseException, JsonMappingException, IOException {

        //Second upsert executed (i.e. without positional parameter)
        Assert.isTrue(queryOperations.updateDepartmentCollectionWithoutFind("Raj", "2014-09-26T04:00:00.000Z"));

    }

    @Test
    public void updateDCWhenMatchingDocumentsPresentButDocumentHasOnlyRegularEmployeeType() throws JsonParseException, JsonMappingException, IOException {

        //Second upsert executed  (i.e. without positional parameter)       
        Assert.isTrue(queryOperations.updateDepartmentCollectionWithoutFind("Jo", "2014-09-26T04:00:00.000Z"));

    }   

    @Test
    public void updateDCWhenMultipleTypesPresentButNoRegular() throws JsonParseException, JsonMappingException, IOException {

        //First upsert executed  (i.e. with positional parameter). However, it creates a new document.      
        Assert.isTrue(queryOperations.updateDepartmentCollectionWithoutFind("Jo", "2014-09-27T04:00:00.000Z"));

    }   

    @Test
    public void updateDCWhenMultipleTypesPresentIncludingRegular() throws JsonParseException, JsonMappingException, IOException {

        //First upsert executed (i.e. with positional parameter) and existing document has been updated.        
        Assert.isTrue(queryOperations.updateDepartmentCollectionWithoutFind("Jo", "2014-09-29T04:00:00.000Z"));

    }