Springboot整合mybatisplus实战
Springboot整合mybatisplus，纯后端，验证结果是通过postman调用的，记录一下
1、建表语句以及初始化数据脚本
CREATE TABLE `tbl_book` (
`id` int NOT NULL AUTO_INCREMENT,
`type` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
`name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
`description` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=10014 DEFAULT CHARSET=utf8
INSERT INTO `tbl_book` VALUES (10000, '计算机理论', 'Java编程思想（第4版）', 'Java学习经典,殿堂级著作！赢得了全球程序员的广泛赞誉。');
INSERT INTO `tbl_book` VALUES (10001, '计算机理论', '计算机组成原理', '资深的计算机体系结构教育家Alan Clements博士编写，涵盖计算机系统的组成和体系结构的基本概念、指令系统以及处理器实现等涉及计算机组成原理课程的内容。');
INSERT INTO `tbl_book` VALUES (10002, '程序设计', 'C++ Primer Plus 第6版 中文版', 'C++程序设计经典教程，畅销30年的C++大百科全书全新升级，经典C++入门教程十年新版再现\')');
INSERT INTO `tbl_book` VALUES (10003, '程序设计', 'RocketMQ技术内幕：RocketMQ架构设计与实现原理（第2版）', '畅销书升级，RocketMQ创始人高度评价，深入源码分析技术架构和实现原理，打造高性能、高可用、高吞吐量、低延迟RocketMQ');
INSERT INTO `tbl_book` VALUES (10004, '程序设计', ' 深入理解Java虚拟机：JVM高级特性与实践（第3版）', '周志明虚拟机新作，第3版新增内容近50%，5个维度全面剖析JVM，大厂面试知识点全覆盖。与 Java编程思想、Effective Java、Java核心技术 堪称：Java四大名著');
INSERT INTO `tbl_book` VALUES (10005, '历史', '见识城邦·人类简史：从动物到上帝（新版）', '以色列新锐历史学家尤瓦尔·赫拉利代表作，第十届文津图书奖获奖作品');
INSERT INTO `tbl_book` VALUES (10006, '历史', '中国通史', '吕思勉先生写给普通读者的中国通史入门书，用白话文写成的中国通史，把历史从“帝王的家谱”转变为人类的进化史');
INSERT INTO `tbl_book` VALUES (10007, '哲学', '理想国（柏拉图代表作）', '奠定西方哲学史的源流之作。2021新译本，以斯灵斯校勘本为底本，遵照“字对字”的原则，从古希腊原文直译，兼顾准确性和语言通顺性，助你读懂理想国。');
INSERT INTO `tbl_book` VALUES (10008, '哲学', '苏格拉底的申辩', '《柏拉图注疏集:苏格拉底的申辩》记述的是公元前399年，一个叫莫勒图斯的年轻人在雅典状告哲学家苏格拉底，说他不信城邦诸神，引进新的精灵之事，败坏青年。 于是，苏格拉底被传讯，在500人组成的陪审团面前作了著名的申辩。');
INSERT INTO `tbl_book` VALUES (10009, '文学', '鲁迅全集', '大师全集，完整收录，鲁迅毕生之心血尽归于此。\r\n\r\n 鲁迅是中国20世纪的文学家、思想家、革命家，中国近代文学巨匠。他早年留学于日本，后来弃医从文，他用笔耕不辍的文字为新一代青年们指引方向，在国内外思想文化领域有着极高的声誉。');
INSERT INTO `tbl_book` VALUES (10010, '文学', '人间清醒', '茅盾文学奖获得者梁晓声2021全新力作');
INSERT INTO `tbl_book` VALUES (10011, '经济', '八次危机：中国的真实经验1949-2009', '著名“三农”专家温铁军，用经济的独特视角，重新审视中国的1949-2009，历史给我了我们怎样的真实经验？');
2、项目目录
3、pom文件
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.1.RELEASE
com.example
springboot
0.0.1-SNAPSHOT
springboot
Demo project for Spring Boot
8
org.springframework.boot
spring-boot-starter-web
mysql
mysql-connector-java
8.0.20
org.projectlombok
lombok
true
org.springframework.boot
spring-boot-starter-test
test
com.baomidou
mybatis-plus-boot-starter
3.1.1
com.alibaba
druid-spring-boot-starter
1.2.6
org.springframework.boot
spring-boot-maven-plugin
org.projectlombok
lombok
4、application文件
spring:
datasource:
druid:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/myproject?serverTimezone=UTC
username: root
password: root
mybatis-plus:
global-config:
db-config:
table-prefix: tbl_
id-type: auto
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #开启MP运行日志信息
5、PO类以及VO类
package com.example.po;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Book {
private Integer id;
private String type;
private String name;
private String description;
}
package com.example.vo;
/**
* 供页面显示使用的类
*/
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class BookVo {
private String type;
private String name;
private String description;
}
6、Dao层
package com.example.dao;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.po.Book;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Component;
@Mapper
@Component
public interface BookDao extends BaseMapper {
}
7、service以及实现类
package com.example.service;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.po.Book;
/**
* 基于 mybatisplus 实现CRUD快速开发
*/
public interface IBookService extends IService {
IPage getPage(Integer currentPage,Integer pageSize);
IPage getPage(Integer currentPage,Integer pageSize,Book book);
}
package com.example.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.dao.BookDao;
import com.example.po.Book;
import com.example.service.IBookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
@Service
public class IBookServiceImpl extends ServiceImpl implements IBookService {
@Autowired
private BookDao bookDao;
@Override
public IPage getPage(Integer currentPage, Integer pageSize) {
Page page = new Page<>(currentPage,pageSize);
bookDao.selectPage(page,null);
return page;
}
@Override
public IPage getPage(Integer currentPage, Integer pageSize, Book book) {
LambdaQueryWrapper queryWrapper = new LambdaQueryWrapper();
queryWrapper.like(!StringUtils.isEmpty(book.getType()),Book::getType,book.getType());
queryWrapper.like(!StringUtils.isEmpty(book.getName()),Book::getName,book.getName());
queryWrapper.like(!StringUtils.isEmpty(book.getDescription()),Book::getDescription,book.getDescription());
Page page = new Page<>(currentPage,pageSize);
bookDao.selectPage(page,queryWrapper);
return page;
}
}
8、controller层
package com.example.controller;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.example.global.PlatErrorCodeEnum;
import com.example.po.Book;
import com.example.global.Response;
import com.example.global.ResponseBuilder;
import com.example.service.IBookService;
import com.example.vo.BookVo;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
import java.util.stream.Collectors;
@RestController
@RequestMapping("/books")
public class BookController {
@Autowired
private IBookService bookService;
//查询所有数据
@GetMapping
public Response> getBooks(){
List bookList = bookService.list().stream().map(po -> {
BookVo vo = new BookVo();
//将两个字段相同的对象进行属性值的复制
BeanUtils.copyProperties(po, vo);
return vo;
}).collect(Collectors.toList());
return ResponseBuilder.buildNormalResponse(bookList);
}
//添加数据
@PostMapping("/save")
public Response saveBook(@RequestBody Book book){
Boolean flag = bookService.save(book);
return flag == true ? ResponseBuilder.buildNormalResponse() : ResponseBuilder.buildErrorResponse(PlatErrorCodeEnum.ADD_DATA_FAILED);
}
@PutMapping("/update")
public Response updateBook(@RequestBody Book book){
boolean flag = bookService.updateById(book);
return flag == true ? ResponseBuilder.buildNormalResponse() : ResponseBuilder.buildErrorResponse(PlatErrorCodeEnum.UPDATE_DATA_FAILED);
}
//查询单个数据
@GetMapping("{id}")
public Response getBookById(@PathVariable Integer id){
Book book = bookService.getById(id);
BookVo vo = new BookVo();
BeanUtils.copyProperties(book,vo);
return ResponseBuilder.buildNormalResponse(vo);
}
//删除单个数据
@DeleteMapping("{id}")
public Response deleteBook(@PathVariable Integer id){
boolean flag = bookService.removeById(id);
return flag == true ? ResponseBuilder.buildNormalResponse() : ResponseBuilder.buildErrorResponse(PlatErrorCodeEnum.DELETE_DATA_FAILED);
}
//分页查询数据
@GetMapping("{currentPage}/{pageSize}")
public Response> getBooksByPage(@PathVariable Integer currentPage,@PathVariable Integer pageSize){
IPage page = bookService.getPage(currentPage,pageSize);
//避免查出来所有的数据，增加一个vo类，只展示需要的字段
List bookVos = page.getRecords().stream().map(po -> {
BookVo vo = new BookVo();
//将两个字段相同的对象进行属性值的复制
BeanUtils.copyProperties(po, vo);
return vo;
}).collect(Collectors.toList());
return ResponseBuilder.buildNormalResponse(bookVos);
}
}
9、为了给前端返回统一的值，再加一些优化
package com.example.global;
public enum PlatErrorCodeEnum {
ADD_DATA_FAILED("10000", "添加数据失败"),
UPDATE_DATA_FAILED("10001", "更新数据失败"),
DELETE_DATA_FAILED("10001", "删除数据失败"),
;
public static final String ERROR_CODE="000";
private String code;
private String message;
PlatErrorCodeEnum(String code, String message) {
this.code = code;
this.message = message;
}
public String getCode() {
return code;
}
public String getMessage() {
return message;
}
}package com.example.global;
import lombok.Data;
import lombok.ToString;
import java.io.Serializable;
@Data
@ToString(callSuper = true)
public class Response implements Serializable {
private static final long serialVersionUID = -2644259941898334897L;
private String returnCode;
private String returnMsg;
private T returnData;
public Response(){
}
public Response(String returnCode){
this.returnCode = returnCode;
}
public Response(String returnCode, String returnMsg){
this.returnCode = returnCode;
this.returnMsg = returnMsg;
}
public Response(String returnCode, String returnMsg, T returnData){
this.returnCode = returnCode;
this.returnMsg = returnMsg;
this.returnData = returnData;
}
public T getReturnData() {
return returnData;
}
public Response setReturnData(T returnData) {
this.returnData = returnData;
return this;
}
}
package com.example.global;
/**
* 构造响应结果
*/
public final class ResponseBuilder {
/**
* 返回成功.
*/
public static final String RESPONSE_OK = "0000";
public static final String RESPONSE_MESSAGE = "响应成功";
/**
* 构造一个失败响应
*/
public static Response buildErrorResponse(PlatErrorCodeEnum enums) {
Response entity = new Response<>();
entity.setReturnCode(String.valueOf(enums.getCode()));
entity.setReturnMsg(enums.getMessage());
return entity;
}
/**
* 构造一个失败响应
*/
public static Response buildErrorResponse(String error, String message) {
Response entity = new Response<>();
entity.setReturnCode(error);
entity.setReturnMsg(message);
return entity;
}
/**
* 构造一个正常的没有返回数据的响应
*/
public static Response buildNormalResponse() {
return new Response(RESPONSE_OK, RESPONSE_MESSAGE);
}
/**
* 构造一个正常的有返回数据的响应
* @param returnData
* @param
* @return
*/
public static Response buildNormalResponse(T returnData) {
Response entity = buildNormalResponse();
entity.setReturnData(returnData);
return entity;
}
}
10、mybatisplus分页插件配置
package com.example.config;
/**
* 配置mybatisplus分页插件
*/
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@MapperScan("com.example.dao")
public class MyBatisPlusConf {
@Bean
public PaginationInterceptor mybatisPlusInterceptor(){
//创建拦截器 SpringBoot 低版本用 PaginationInterceptor 高版本用 MybatisPlusInterceptor
PaginationInterceptor interceptor = new PaginationInterceptor();
return interceptor;
}
}