新建一個包,里面放入一些常用的配置類

引入mybatis-plus包與插件

引入包

前往官網(wǎng)查看

https://baomidou.com/pages/226c21/#%E5%88%9D%E5%A7%8B%E5%8C%96%E5%B7%A5%E7%A8%8B

<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.3.4</version> </dependency>

MybatisPlusConfig----MybatisPlus配置文件

import com.baomidou.mybatisplus.annotation.DbType; import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor; import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor; import org.mybatis.spring.annotation.MapperScan; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;@Configuration @MapperScan("com.example.demo.mapper") public class MybatisPlusConfig {/*** mybatis-plus.分頁插件* @return*/@Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor() {MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.H2));return interceptor;} }

配置result包裝返回與前臺交互數(shù)據(jù)對象

code 代表成功或者失敗;
msg即返回的信息

package com.example.demo.common; //T是范型 public class Result<T> {private String code;private String msg;private T data;public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public T getData() {return data;}public void setData(T data) {this.data = data;}public Result(){}public Result(T data){this.data = data;}public static Result success(){Result result = new Result<>();result.setCode("0");result.setMsg("成功");return result;}//返回一個數(shù)據(jù)public static <T> Result<T> success(T data) {Result<T> result = new Result<>(data);result.setCode("0");result.setMsg("成功");return result;}//錯誤返回public static Result error(String code,String msg){Result result = new Result();result.setCode(code);result.setMsg(msg);return result;} }

編寫用戶接口

新建一個包entity實體類

建一個java對象與數(shù)據(jù)庫進行一 一對應

package com.example.demo.entity;import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableId; import com.baomidou.mybatisplus.annotation.TableName; import lombok.Data;//與數(shù)據(jù)庫的表名一一對應 @TableName("user") //使用lombok插件簡化快速寫代碼 @Data public class User {//定義自增@TableId(type = IdType.AUTO)private Integer id;private String username;private Integer age;private String sex;private String address;private String password;}

編寫用戶接口UserControlller

新建一個包Controller

package com.example.demo.controller;import com.example.demo.common.Result; import com.example.demo.entity.User; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;//定義返回json數(shù)據(jù) @RestController //定義路由 @RequestMapping("/user") public class UserController {//定義post接口@PostMapping//前端網(wǎng)頁的新增用戶接口,@RequestBody作用是使前臺傳來的json格式的代碼轉化為java對象public Result save(@RequestBody User user) {}}

拿到user數(shù)據(jù)之后就可以把它插入到數(shù)據(jù)庫當中,編寫mapper部分

創(chuàng)建一個UserMapper接口類

前往mybatis-plus官網(wǎng)參考

https://baomidou.com/pages/49cc81/#mapper-crud-%E6%8E%A5%E5%8F%A3

繼承BaseMapper 就可以實現(xiàn)一些數(shù)據(jù)庫單表的增刪改查

package com.example.demo.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.example.demo.entity.User;public interface UserMapper extends BaseMapper<User> { }

最后完善一下UserConler接口

package com.example.demo.controller;import com.example.demo.common.Result; import com.example.demo.entity.User; import com.example.demo.mapper.UserMapper; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;//定義返回json數(shù)據(jù) @RestController //定義路由 @RequestMapping("/user") public class UserController {//將mapper引入@ResourceUserMapper userMapper;//定義post接口@PostMapping//前端網(wǎng)頁的新增用戶接口,@RequestBody作用是使前臺傳來的json格式的代碼轉化為java對象//<?>泛型表示任何一種類型public Result<?> save(@RequestBody User user) {userMapper.insert(user);return Result.success();}}

總結

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