SpringBoot Jpa企业开发示例详细讲解

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Spring Data JPA 依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
 <!-- mysql驱动 依赖 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

@Table(name="db_dictionary")
@Data
@Entity
public class DbDictionary implements Serializable {
    @Id
    @GenericGenerator(name = "faceset_generator", strategy = "uuid")
    @GeneratedValue(generator = "faceset_generator")
    @Column
    private String id;
    /**
     * 类型名称
     */
    @Size(max = 50)
    @Column
    @NotNull
    private String type;
    /**
     * 中文
     */
    @Column
    @NotNull
    private String name;
    /**
     * 代码
     */
    @Column
    @NotNull
    private String code;
    /**
     * 顺序
     */
    private Integer sort;
    /**
     * 描述信息
     */
    @Column
    private String remark;
    private static final long serialVersionUID = 1L;
}

@Repository
public interface DictionaryDao extends JpaRepository<DbDictionary, String> {
}

/**
 * 实体继承映射类基础 ，保存实体的通用属性
 */
@Data
@Accessors(chain = true)
@MappedSuperclass   //实体继承映射
public abstract class BaseEntity implements Serializable {
    /**
     * 创建者
     */
    @Basic
    @Column(length = 50)
    private String creator;
    /**
     * 修改者
     */
    @Basic
    @Column(length = 50)
    private String modifier;
    /**
     * 创建时间
     */
    @Basic
    @Column(name = "create_time")
    @CreatedDate
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date createTime;
    /**
     * 修改时间
     */
    @Basic
    @Column(name = "update_time")
    @LastModifiedDate
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private Date updateTime;
}

// 根据名称和性别查询用户
User findByNameAndSex(String name, String sex);

@Query(nativeQuery = true, value = "select * from user where name = :name and sex = :sex")
User findByNameAndSex(@Param("name") String name, @Param("sex") String sex);

List<T> findAll(Sort sort);
//按创建时间倒序排列
Sort.by("createTime").descending()

Page<T> findAll(Pageable pageable);
/*获取分页参数*/
public PageRequest getPageRequest() {
    return getPageRequest(Sort.unsorted());
}
/*获取分页和排序参数*/
public PageRequest getPageRequest(Sort sort) {
    ServletRequestAttributes attributes = getServletRequestAttributes();
    if (StringUtils.hasText(attributes.getRequest().getParameter("page")) && StringUtils.hasText(attributes.getRequest().getParameter("size"))) {
        int page = Integer.parseInt(attributes.getRequest().getParameter("page"));
        int size = Integer.parseInt(attributes.getRequest().getParameter("size"));
        return PageRequest.of(page, size, sort);
    }
    return PageRequest.of(Constants.zero, Constants.ten);
}

List<T> findAll(@Nullable Specification<T> spec);
Specification<ProjectionInfo> spec = (Specification<ProjectionInfo>) (root, query, cb) -> {
    List<Predicate> predicateList = new ArrayList<>();
    // 时间
    if (null != startTime && null != endTime) {
        predicateList.add(cb.between(root.get("createTime"), startTime, endTime));
    }
    // 数字
    if (searchDto.getCloud() != null) {
        predicateList.add(cb.le(root.<Integer>get("cloudPercent"), searchDto.getCloud()));
    }
    // 字符串
    if (searchDto.getName() != null) {
        predicateList.add(cb.equal(root.get("name"), searchDto.getName()));
    }
    // 列表
    if (StrUtil.isNotEmpty(searchDto.getSatellite())) {
        String[] satellites = searchDto.getSatellite().split(",");
        Expression<String> exp = root.<String>get("satellite");
        predicateList.add(exp.in(Arrays.asList(satellites)));
    }
    Predicate[] pre = new Predicate[predicateList.size()];
    pre = predicateList.toArray(pre);
    return query.where(pre).getRestriction();
};

@Query(nativeQuery = true, value = "SELECT satellite, count(id), COALESCE(sum(file_size), 0) FROM t_mas_orbit_info" +
            " WHERE create_time BETWEEN :startTime AND :endTime " +
            " GROUP BY satellite")
List<Object[]> satelliteDataIncreased(@Param("startTime") Date startTime,
                                      @Param("endTime") Date endTime);

@Query(value = "SELECT new cn.piesat.dispatch.model.vo.FileDataVO(p.id, p.fileName,p.stationCode,p.fileSize, p.fileDate, p.createTime, p.state, p.filePath,p.forwardTime) " +
            " FROM DbZxjProductInfoDTO p ")
List<FileDataVO> getFileList();

@Query(nativeQuery = true, value = "UPDATE db_order_info SET download_count = (SELECT download_count + 1) WHERE id = :orderId ")
@Modifying
@Transactional
int updateDownloadTimes(String orderId);

@Modifying
@Transactional
void deleteByName(String name);