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我試圖在querydsl和spring-data中找到我的mongodb數據庫中的結果，當我在類MyDocument中使用MyInterfaceImpl類型時，我得到了一些結果。如果我使用MyInterface， 我沒有得到任何結果。使用MongoRepository，我也可以使用MyInterface獲得結果。 QueryDSL和Java中的接口有什麼特別之處嗎？ 我錯過了什麼嗎？Querydsl和Java與Mongodb的接口
我發現下面的職位，但仍然有或沒有@QuerySupertype上MyInterface的得到相同的結果：
How queryDSL works with interface?
package com.myapp.bean.subfolder;
...
@Document
public class MyDocument implements Comparable<MyDocument>, IMyDocument{
private MyInterface myInterface;
@Id
private String id;
@CreatedDate
private Date createdDate;
public void setCreatedDate(Date createdDate) {
this.createdDate = createdDate;
}
public Date getCreatedDate() {
return createdDate;
}
public void setMyInterface(MyInterface myInterface) {
this.myInterface = myInterface;
}
public MyInterface getMyInterface() {
return myInterface;
}
...
}
MyInterface的：
package com.myapp.bean;
@QuerySupertype
public interface MyInterface {
public MyInterfaceImplBase getMyInterfaceImplBase();
public void setMyInterfaceImplBase(MyInterfaceImplBase myInterfaceImplBase);
public String getIdExterne();
public void setIdExterne(String idExterne);
}
MyInterfaceImpl：
package com.myapp.bean.subfolder;
...
@Document
public class MyInterfaceImpl implements MyInterface{
private MyInterfaceImplBase myInterfaceImplBase;
@Id
private String idExterne;
public MyInterfaceImplBase getMyInterfaceImplBase() {
return myInterfaceImplBase;
}
public void setMyInterfaceImplBase(MyInterfaceImplBase myInterfaceImplBase) {
this.myInterfaceImplBase = myInterfaceImplBase;
}
public String getIdExterne() {
return idExterne;
}
public void setIdExterne(String idExterne) {
this.idExterne = idExterne;
}
}
MyInterfaceImplBase.java：
package com.myapp.bean;
...
@Document
public class MyInterfaceImplBase {
@Id
private String internalId;
public String getInternalId() {
return internalId;
}
public void setInternalId(String internalId) {
this.internalId = internalId;
}
}
MyDocumentRepository.java：
package com.myapp.repository;
...
public interface MyDocumentRepository extends MongoRepository<MyDocument, String>, QueryDslPredicateExecutor<MyDocument> {
Collection<MyDocument> findByMyInterface(MyInterface myInterface);
}
MyService.java：
package com.myapp.service;
---
@Service
public class MyService {
@Autowired
MyDocumentRepository myDocumentRepository;
public Iterable<MyDocument> findById(String id){
BooleanExpression booleanExpression = QMyDocument.myDocument.myInterface.externalId.eq("1");
return myDocumentRepository.findAll(booleanExpression);
}
}
MyServiceTest.java：
package com.myapp.service;
...
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes={MongoConfig.class, ServiceConfig.class, BeanConfig.class, FactoryConfig.class})
public class MyServiceTest {
@Autowired
MyService myService;
@Before
public void setup() {
}
@Test
public void findByObjectIdInDB(){
String id = 1;
Iterable<MyDocument> iterableResult = myService.findById(id);
assertEquals(1,Lists.newArrayList(iterableResult).size());
}
}
MongoDB中的數據：
{ "_id" : ObjectId("58b09c55a7986c0ce0407a76"), "_class" : "com.myapp.bean.subfolder.MyDocument", "myInterface" : { "_class" : "com.myapp.bean.subfolder.MyInterfaceImpl", "_id" : "1", "myInterfaceImplBase" : { "_id" : "2" }}, "createdDate" : ISODate("2017-02-24T20:49:25.891Z") }
當我運行MyServiceTest.java：booleanExpression = 「myDocument.myInterface.idExterne = 1」
下面是從我的pom.xml的相關信息：
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-mongodb</artifactId>
<version>1.9.4.RELEASE</version>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-jpa</artifactId>
<version>4.1.4</version>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-core</artifactId>
<version>4.1.4</version>
</dependency>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-mongodb</artifactId>
<version>4.1.4</version>
</dependency>
<plugin>
<groupId>com.mysema.maven</groupId>
<artifactId>apt-maven-plugin</artifactId>
<version>1.1.3</version>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<configuration>
<outputDirectory>target/generated-sources/apt</outputDirectory>
<processor>org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor</processor>
</configuration>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-apt</artifactId>
<version>4.1.4</version>
</dependency>
</dependencies>
</plugin>