查詢和使用嗎啡數據存儲

Question

我有類如下MongoDB中更新：

@Entity("Collection_IAGlobals") 
public class MoDBIAGlobals { 
    @Id 
    @Indexed 
    String id; 

    @Embedded 
    Map<EnumChannelType, MoDBChannel> data = new HashMap<EnumChannelType, MoDBChannel>(); 
} 

其中，MoDBChannel類是：

@Entity("Collection_IAGlobals") 
@Embedded 
public class MoDBChannel extends MoDBTopic { 
    @Indexed 
    private String channelId; 

    @Embedded 
    private Map<String, MoDBTopic> data = new HashMap<String, MoDBTopic>(); 
} 

和MoDBTopic類是：

@Entity("Collection_IAGlobals") 
@Embedded 
public class MoDBTopic { 
    private String topic; 
    private Double score1 = 0.0; 
    private Double score2 = 0.0; 
} 

和MoDBIA_DAO等級：

public class MoDBIA_DAO extends BasicDAO<MoDBIAGlobals, String> { 
    public MoDBIA_DAO(Mongo mongo, Morphia morphia, String dbName) { 
     super(mongo, morphia, dbName); 
    } 
} 

我MoDBIAGlobals類的對象保存爲：

dataStore.save(globals) 

其中全局的JSON如下：

{"id":"usr1234", 
"data":{"FACEBOOK":{"channelId":"FB1234", 
        "data":{"NO_TOPIC":{"topic":"NO_TOPIC", 
             "score1":1.0, 
             "score2":0.0}}, 
        "score1":0.0, 
        "score2":0.0}}} 

現在我想查詢以獲得MoDBIAGlobals類的對象，其中"id"=="usr1234"和"channelId"=="FB1234"。我如何創建這個查詢？

我試圖像下面，但我無法得到任何結果：

MoDBIA_DAO dao = new MoDBIA_DAO(mongo, morphia, DB_Name); 
Datastore dataStore = morphia.createDatastore(mongo, DB_Name); 
Query<MoDBIAGlobals> query = dataStore.createQuery(MoDBIAGlobals.class).disableValidation(); 

query.field("data.channelId").equal("FB1234"); 
query.field("data.data.topic").equal("NO_TOPIC"); 
QueryResults<MoDBIAGlobals> results = dao.find(query); 
System.out.println("results: " + results); 
System.out.println("results.count: " + results.countAll()); 

它的打印結果爲：

results: { "data.channelId" : "FB1234" , "data.data.topic" : "NO_TOPIC"} 
results.count: 0 

難道我做錯了什麼？

Answer 1

，如果你想通過id和channelId找到MoDBIAGlobals我不明白你爲什麼查詢data.channelId和data.data.topic。而且你的數據建模也很混亂。無論如何，似乎你的查詢不符合你的文檔結構。字段data.data.topic和data.channelId不存在。嘗試修復與代碼波紋管代替：

MoDBIA_DAO dao = new MoDBIA_DAO(mongo, morphia, DB_Name); 
Datastore dataStore = morphia.createDatastore(mongo, DB_Name); 
Query<MoDBIAGlobals> query = dataStore.createQuery(MoDBIAGlobals.class).disableValidation(); 

query.field("data.FACEBOOK.channelId").equal("FB1234"); 
query.field("data.FACEBOOK.data.topic.NO_TOPIC").equal("NO_TOPIC"); 
QueryResults<MoDBIAGlobals> results = dao.find(query); 
System.out.println("results: " + results); 
System.out.println("results.count: " + results.countAll()); 

現在，如果你想通過id和channelId查詢，試試這個：

MoDBIA_DAO dao = new MoDBIA_DAO(mongo, morphia, DB_Name); 
Datastore dataStore = morphia.createDatastore(mongo, DB_Name); 
Query<MoDBIAGlobals> query = dataStore.createQuery(MoDBIAGlobals.class).disableValidation(); 

query.field("data.FACEBOOK.channelId").equal("FB1234"); 
query.field("id").equal("user1234"); 

QueryResults<MoDBIAGlobals> results = dao.find(query); 
System.out.println("results: " + results); 
System.out.println("results.count: " + results.countAll());