JPA @Query动态添加参数查询(超级详细，附代码)

1：新建实体类

@Data
@Entity
@Table(name = "student")
@DynamicUpdate
@DynamicInsert
public class Student {

	@Id
	@JsonSerialize(using = ToStringSerializer.class)
	@Column(name = "id")
	private Long id;

	@Column(name = "name")
	private String name;

	@Column(name = "address")
	private String address;

	@Column(name = "create_time")
	@JsonIgnore
	private Date createTime;

	@Column(name = "update_time")
	@JsonIgnore
	private Date updateTime;

	@Version
	@JsonIgnore
	@Column(name = "version")
	private int version;

	@PreUpdate
	protected void onUpdate() {
		updateTime = new Date();
	}

	@PrePersist
	protected void onCreate() {
		createTime = new Date();
		updateTime = new Date();
	}

}

2.Jpa接口

当传递的参数address值为null时，查询的就是全部学生，当address有值时，查询的就是某一地区的所有学生信息

@Repository
public interface StudentRepository extends JpaRepository<Student, Long>, JpaSpecificationExecutor<Student> {
    
    @Query("select student.name, student.address from Student student " +
        "  where (student.name = ?1 or ?1 is null)  ")
    List<TestVo> find(String address);
}

3：编写自定义接收查询结果的TestVo接口

public interface TestVo{
   String getName();
   String getAddress();
}

4：自己编写测试类调用即可