mrh-jpa-spring-boot-autoconfigure

针对单表动态条件查询，基于 jpa specification、java8 lambda、cglib 进行扩展

示例实体

@Getter
@Setter
@Entity(name="t_hello")
public class HelloEntity {

    @Id
    @Column(name="id", length=36, nullable=false)
    private String id;

    @Column(name="username", length=50, nullable=false)
    private String username;

    @Column(name="gender", length=11, nullable=false)
    private Integer gender;

}

public interface HelloRepository extends JpaExampleRepository<HelloEntity, String> {}

示例代码

简单and条件查询：

    JpaExample<HelloEntity> example = JpaExample.from(HelloEntity.class);
    example.where()
        .equal(HelloEntity::getUsername, "张三")
        .equal(HelloEntity::getGender, 1);
    List<HelloEntity> entities = helloRepo.findAll(example);

    select * from t_hello where username='张三' and gender=1

简单or条件查询：

    JpaExample<HelloEntity> example = JpaExample.from(HelloEntity.class);
    example.whereOr()
        .equal(HelloEntity::getUsername, "张三")
        .equal(HelloEntity::getUsername, "李四");
    List<HelloEntity> entities = helloRepo.findAll(example);

    select * from t_hello where username='张三' or username='李四'

条件过滤查询：

    JpaExample<HelloEntity> example = JpaExample.from(HelloEntity.class);
    example.where()
        .equalIgnoreBlank(HelloEntity::getUsername, " ")
        .rightLikeIgnoreBlank(HelloEntity::getUsername, "李四")
        .equal(HelloEntity::getGender, 0);
    List<HelloEntity> entities = helloRepo.findAll(example);

    select * from t_hello where username='李四' and gender=0

and/or条件嵌套查询(可以无限嵌套)：

    JpaExample<HelloEntity> example = JpaExample.from(HelloEntity.class);
    JpaAndPredicates<HelloEntity> predicates = example.where();
    predicates.or()
        .equal(HelloEntity::getUsername, "张三")
        .equal(HelloEntity::getUsername, "李四")
    predicates.or()
        .equal(HelloEntity::getGender, 0)
        .equal(HelloEntity::getGender, 1);
    List<HelloEntity> entities = helloRepo.findAll(example);

    select * from t_hello where ( username='张三' or username='李四' ) and ( gender=0 or gender=1 )

单个排序查询：

    JpaExample<HelloEntity> example = JpaExample.from(HelloEntity.class);
    example.where()
        .equal(HelloEntity::getUsername, "测试1")
        .equal(HelloEntity::getGender, 1);
    example.asc(HelloEntity::getId);
    List<HelloEntity> entities = helloRepo.findAll(example);

    select * from table_hello where user_name=? and gender=? order by id asc

多个排序查询：

    JpaExample<HelloEntity> example = JpaExample.from(HelloEntity.class);
    example.where()
        .equal(HelloEntity::getUsername, "测试1")
        .equal(HelloEntity::getGender, 1);
    example.asc(HelloEntity::getId);
    example.desc(HelloEntity::getGender);
    List<HelloEntity> entities = helloRepo.findAll(example);

    select * from table_hello where user_name=? and gender=? order by id asc, gender desc