JPA查詢過於複雜，使用queryDSL配合JPA能夠更靈活的使用查詢功能。

1.pom配置如下：

2.使用maven的apt-maven-plugin實現查詢模版的自動生成

<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/annotations</outputDirectory>
                    <processor>
 
com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
                </configuration>
            </execution>
        </executions>
    </plugin>
</plugins>

maven編譯後，自動生成查詢模版

public class QStudent extends EntityPathBase<Student> {
private static final long 
 
serialVersionUID = 2136978263L;
public static final QStudent student = new QStudent("student");
public final StringPath age = createString("age");
public final NumberPath<Integer> host = createNumber("host", Integer.class);
public final NumberPath<Long> id = createNumber("id", Long.class);
public final StringPath name = createString("name");
public final StringPath sex = createString("sex");
public final DateTimePath<java.util.Date> startDate = createDateTime("startDate", java.util.Date.class);
public QStudent(String variable) {
super(Student.class, forVariable(variable));
    }
public QStudent(Path<? extends Student> path) {
super(path.getType(), path.getMetadata());
    }
public QStudent(PathMetadata metadata) {
super(Student.class, metadata);
    }

3.JPA持久層整合QueryDslPredicteExecutor藉口

import com.five.fiveeducation.entity.Student;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.querydsl.QueryDslPredicateExecutor;
public interface EducationDao extends JpaRepository<Student,Long>,QueryDslPredicateExecutor<Student> {
}

完成JPA整合queryDSL的初步配置