第一次在 Spring 上使用 QueryDSL 进行 MongoDB

问题描述 投票：0回答：2

我正在尝试使用 QueryDSL 进行简单的 MongoDB 查询。我现在只是使用 Spring Data 访问 MongoDB。无论我尝试什么，我都无法创建 Q 类。

这是我到目前为止所尝试过的。

问题.java

@QueryEntity
@Document(collection = "issues")
public class Issue {

    private @Id long id;

    private String body;
    private long prodId;
    private long timestamp;
    public Issue() {}
    ...

IssueRepository.java

@RepositoryRestResource(collectionResourceRel = "issues", path = "issues")
public interface IssueRepository extends MongoRepository<IssueModel, String>,
QueryDslPredicateExecutor<IssueModel>{

    public List<IssueModel> findByBody(String body);
    public List<IssueModel> findByProdId(long prodId);

}

Pom.xml

<dependencies>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk</artifactId>
            <version>1.10.12</version>
            <exclusions>
                <exclusion>
                    <artifactId>jackson-core</artifactId>
                    <groupId>com.fasterxml.jackson.core</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>jackson-databind</artifactId>
                    <groupId>com.fasterxml.jackson.core</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>jackson-annotations</artifactId>
                    <groupId>com.fasterxml.jackson.core</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j</artifactId> 
            </dependency> -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-remote-shell</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <exclusions>
                <exclusion>
                    <artifactId>tools</artifactId>
                    <groupId>com.sun</groupId>
                </exclusion>
            </exclusions>
            <groupId>com.basho.riak</groupId>
            <artifactId>riak-client</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.plexus</groupId>
            <artifactId>plexus-utils</artifactId>
            <version>3.0.15</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>com.googlecode.json-simple</groupId>
            <artifactId>json-simple</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
        <dependency>
            <groupId>net.kencochrane.raven</groupId>
            <artifactId>raven-logback</artifactId>
            <version>6.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-neo4j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>com.mysema.querydsl</groupId>
            <artifactId>querydsl-apt</artifactId>
            <version>3.6.8</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.mysema.querydsl</groupId>
            <artifactId>querydsl-mongodb</artifactId>
            <version>3.6.8</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>com.mysema.maven</groupId>
                <artifactId>apt-maven-plugin</artifactId>
                <version>1.1.3</version>
                <executions>
                    <execution>
                    <phase>generate-sources</phase>
                        <goals>
                            <goal>process</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>target/gen-sources/java</outputDirectory>
                            <processor>com.mysema.query.apt.QuerydslAnnotationProcessor</processor>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

当我运行时

maven build-sources
什么也没有发生。当我将 POM.xml 更改为使用 
com.mysema.query.apt.morphia.MorphiaAnnotationProcessor
时，我收到 
Entity
的 classnotfound 异常。

我在互联网上找不到关于此的简单教程。

java spring mongodb spring-mvc querydsl
2个回答
6
投票

将插件处理器更改为 

org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor

Spring Data Mongo 提供了一个自定义 APT 处理器来生成 元模型而不是 QueryDSL 中提供的元模型，它将扫描 Spring 特定的 @Document，而不是 Morphia 特定的注释。

然后运行 

mvn compile
在您指定的 outputDirectory 中生成元模型。

您还可以删除 

@QueryEntity
注释。

0
投票

您可以添加这个小库 https://github.com/rahimalizada/spring-data-mongodb-querydsl-processor我专门创建了使用 maven-compiler-plugin 来启用自动注释处理。在执行 IDE (IntelliJ) 构建时它也可以正常工作。

使用示例：

 <build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.11.0</version>
      <configuration>
        <annotationProcessorPaths>
          <path>
            <groupId>com.jyvee</groupId>
            <artifactId>spring-data-mongodb-querydsl-processor</artifactId>
            <version>1.0.0</version>
          </path>
          <path>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-apt</artifactId>
            <version>5.0.0</version>
            <classifier>general</classifier>
          </path>
          <path>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
            <version>4.1.4</version>
          </path>
        </annotationProcessorPaths>
      </configuration>
    </plugin>
  </plugins>
</build>
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