mysqL中tinyint, tinyint unsigned,bigint,datetime,分别对应java中什么数据类型
时间: 2023-12-20 13:43:55 浏览: 95
在Java中,可以将MySQL中的数据类型映射为以下数据类型:
- tinyint:byte或者Short(如果是无符号的tinyint则使用Short)
- bigint:long
- datetime:java.util.Date或者java.time.LocalDateTime
需要注意的是,MySQL的tinyint数据类型默认为有符号的,如果定义了无符号的tinyint,则需要使用Short作为Java数据类型。另外,如果需要将MySQL的datetime数据类型映射为Java 8之前的版本,可以使用java.util.Date,而如果使用Java 8及以上版本,则建议使用java.time.LocalDateTime。
相关问题
举例相应程序,使用Java编程语言和Springboot框架来实现实现对奖品表的管理功能 其中包括文件上传功能CREATE TABLE t_prize_info ( id bigint(20) NOT NULL AUTO_INCREMENT COMMENT '奖品id', name varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '奖品名称', photo_url varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '奖品图片', instruction varchar(500) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '奖品介绍', remark varchar(500) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '备注', status tinyint(4) NOT NULL COMMENT '状态 0:正常 ', is_del tinyint(3) UNSIGNED NOT NULL DEFAULT 0 COMMENT '删除标识(0:正常 1:删除)', create_user_id bigint(20) NULL DEFAULT NULL COMMENT '创建用户id', create_time datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', update_user_id bigint(20) NULL DEFAULT NULL COMMENT '更新用户id', update_time datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '更新时间', PRIMARY KEY (id) USING BTREE )
好的,以下是一个简单的使用Java编程语言和Springboot框架来实现奖品管理功能的示例程序:
```java
@RestController
@RequestMapping("/prize")
public class PrizeController {
@Autowired
private PrizeService prizeService;
@PostMapping("/upload")
public String upload(@RequestParam("file") MultipartFile file) {
// 处理上传文件
String photoUrl = prizeService.uploadFile(file);
return photoUrl;
}
@PostMapping("/add")
public void addPrize(@RequestBody Prize prize) {
// 添加奖品信息
prizeService.addPrize(prize);
}
@GetMapping("/list")
public List<Prize> listPrize() {
// 查询奖品列表
List<Prize> prizeList = prizeService.listPrize();
return prizeList;
}
@DeleteMapping("/{id}")
public void deletePrize(@PathVariable("id") Long id) {
// 删除奖品
prizeService.deletePrize(id);
}
}
@Service
public class PrizeService {
@Autowired
private PrizeMapper prizeMapper;
public String uploadFile(MultipartFile file) {
// 处理上传文件
// 返回文件上传后的路径
}
public void addPrize(Prize prize) {
// 添加奖品信息到数据库
prizeMapper.addPrize(prize);
}
public List<Prize> listPrize() {
// 查询奖品列表
List<Prize> prizeList = prizeMapper.listPrize();
return prizeList;
}
public void deletePrize(Long id) {
// 删除奖品信息
prizeMapper.deletePrize(id);
}
}
@Repository
public interface PrizeMapper {
void addPrize(Prize prize);
List<Prize> listPrize();
void deletePrize(Long id);
}
public class Prize {
private Long id;
private String name;
private String photoUrl;
private String instruction;
private String remark;
private Integer status;
private Integer isDel;
private Long createUserId;
private Date createTime;
private Long updateUserId;
private Date updateTime;
// getter和setter方法
}
```
在这个程序中,我们使用了Springboot框架来实现奖品管理功能。包括文件上传、添加奖品、查询奖品列表、删除奖品等操作。同时,我们也使用了Mybatis框架来操作数据库。
CREATE TABLE `orders_invoiced_record` ( `id` bigint unsigned NOT NULL AUTO_INCREMENT, `created_at` datetime(3) DEFAULT NULL, `updated_at` datetime(3) DEFAULT NULL, `order_id` bigint unsigned DEFAULT NULL COMMENT '订单ID', `before_invoiced` tinyint(1) DEFAULT '0' COMMENT '修改前开票状态:0未开票,1已开票', `after_invoiced` tinyint(1) DEFAULT '0' COMMENT '修改后开票状态:0未开票,1已开票', `operation` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '操作人', `approval_no` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '审批单号', `remark` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '备注', PRIMARY KEY (`id`) USING BTREE, KEY `idx_order_id` (`order_id`) USING BTREE ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci ROW_FORMAT=DYNAMIC COMMENT '订单开票状态修改记录';根据表结构生成java的实体类,持久层,业务层,同时添加注释
好的,以下是根据该表结构生成的Java实体类、持久层和业务层的代码,以及注释。
1. Java实体类
```java
package com.example.demo.entity;
import lombok.Data;
import javax.persistence.*;
import java.util.Date;
/**
* 订单开票状态修改记录实体类
*/
@Entity
@Table(name = "orders_invoiced_record")
@Data
public class OrdersInvoicedRecord {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "created_at")
@Temporal(TemporalType.TIMESTAMP)
private Date createdAt;
@Column(name = "updated_at")
@Temporal(TemporalType.TIMESTAMP)
private Date updatedAt;
@Column(name = "order_id")
private Long orderId;
@Column(name = "before_invoiced")
private Boolean beforeInvoiced;
@Column(name = "after_invoiced")
private Boolean afterInvoiced;
@Column(name = "operation", nullable = false, length = 50)
private String operation;
@Column(name = "approval_no", nullable = false, length = 50)
private String approvalNo;
@Column(name = "remark", nullable = false, length = 255)
private String remark;
}
```
2. 持久层
```java
package com.example.demo.repository;
import com.example.demo.entity.OrdersInvoicedRecord;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* 订单开票状态修改记录持久层
*/
public interface OrdersInvoicedRecordRepository extends JpaRepository<OrdersInvoicedRecord, Long> {
}
```
3. 业务层
```java
package com.example.demo.service;
import com.example.demo.entity.OrdersInvoicedRecord;
import com.example.demo.repository.OrdersInvoicedRecordRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
/**
* 订单开票状态修改记录业务层
*/
@Service
@Transactional(rollbackFor = Exception.class)
public class OrdersInvoicedRecordService {
@Autowired
private OrdersInvoicedRecordRepository ordersInvoicedRecordRepository;
/**
* 创建订单开票状态修改记录
*
* @param ordersInvoicedRecord 订单开票状态修改记录
* @return 创建的订单开票状态修改记录
*/
public OrdersInvoicedRecord createOrdersInvoicedRecord(OrdersInvoicedRecord ordersInvoicedRecord) {
return ordersInvoicedRecordRepository.save(ordersInvoicedRecord);
}
}
```
注释已经添加在代码中了,如果您有其他问题或需要进一步的帮助,请随时提出。
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