集成mybatis-plus,增加JsonResult返回值类型,增加service层

pom.xml

@@ -42,6 +42,11 @@
             <version>2.3.1</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+            <version>3.3.0</version>
+        </dependency>
 
         <dependency>
             <groupId>org.projectlombok</groupId>

src/main/java/com/example/mybatisdemo/controller/UserController.java

@@ -4,6 +4,8 @@ import com.example.mybatisdemo.mapper.UserMapper;
 import com.example.mybatisdemo.pojo.dto.UserDTO;
 import com.example.mybatisdemo.pojo.entity.User;
 import com.example.mybatisdemo.pojo.vo.UserVO;
+import com.example.mybatisdemo.result.JsonResult;
+import com.example.mybatisdemo.service.IUserService;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
@@ -13,42 +15,31 @@ import org.springframework.web.bind.annotation.*;
 public class UserController {
 
     @Autowired
-    private UserMapper userMapper;
+    private IUserService iUserService;
+
 
     @PostMapping("/addUser")
-    public String addUser(@RequestBody UserDTO userDTO){
-        User user = new User();
-        BeanUtils.copyProperties(userDTO,user);
-        int insert = userMapper.insert(user);
-        if (insert!=0){
-            return "添加成功";
-        }
-        return "添加失败";
+    public JsonResult addUser(@RequestBody UserDTO userDTO) {
+        return iUserService.insertUser(userDTO);
     }
 
-    @GetMapping("/selectUser/{id}")
-    public UserVO selectUser(@PathVariable int id){
-        UserVO userVO = userMapper.selectById(id);
-        return userVO;
+    @PostMapping("/updateUser")
+    public JsonResult updateUser(@RequestBody UserDTO userDTO){
+        return iUserService.updateUser(userDTO);
     }
 
-
-    @PostMapping("/update")
-    public String updateUser(@RequestBody UserDTO userDTO){
-        int i = userMapper.updateById(userDTO);
-        if (i!=0){
-            return "修改成功";
-        }
-        return "修改失败";
+    @PostMapping("/deleteUser")
+    public JsonResult deleteUser(@RequestBody UserDTO userDTO){
+        return iUserService.deleteUser(userDTO);
     }
 
+    @PostMapping("/selectById")
+    public JsonResult selectUserById(@RequestBody UserDTO userDTO){
+        return iUserService.selectUserById(userDTO);
+    }
 
-    @GetMapping("delete/{id}")
-    public String deleteUser(@PathVariable int id){
-        int i = userMapper.deleteById(id);
-        if (i!=0){
-            return "删除成功";
-        }
-        return "删除失败";
+    @PostMapping("/selectByName")
+    public JsonResult selectByName(@RequestBody UserDTO userDTO){
+        return iUserService.selectUserByName(userDTO);
     }
 }

src/main/java/com/example/mybatisdemo/mapper/UserMapper.java

@@ -1,14 +1,12 @@
 package com.example.mybatisdemo.mapper;
 
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.example.mybatisdemo.pojo.dto.UserDTO;
 import com.example.mybatisdemo.pojo.entity.User;
 import com.example.mybatisdemo.pojo.vo.UserVO;
+import org.springframework.stereotype.Repository;
 
+@Repository
+public interface UserMapper extends BaseMapper<User> {
 
-public interface UserMapper {
-
-    UserVO selectById(int id);
-    int insert(User user);
-    int updateById(UserDTO userDTO);
-    int deleteById(int id);
 }

src/main/java/com/example/mybatisdemo/pojo/dto/UserDTO.java

@@ -2,8 +2,10 @@ package com.example.mybatisdemo.pojo.dto;
 
 import lombok.Data;
 
+import java.io.Serializable;
+
 @Data
-public class UserDTO {
+public class UserDTO implements Serializable {
     private Integer id;
     private String name;
     private Integer age;

src/main/java/com/example/mybatisdemo/pojo/entity/User.java

@@ -1,10 +1,16 @@
 package com.example.mybatisdemo.pojo.entity;
 
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.Data;
 
+import java.io.Serializable;
 import java.util.Date;
 @Data
-public class User {
+
+public class User implements Serializable {
+    @TableId(type = IdType.AUTO)
     private Integer id;
     private String name;
     private Integer age;

src/main/java/com/example/mybatisdemo/pojo/vo/UserVO.java

@@ -2,8 +2,10 @@ package com.example.mybatisdemo.pojo.vo;
 
 import lombok.Data;
 
+import java.io.Serializable;
+
 @Data
-public class UserVO {
+public class UserVO implements Serializable {
     private String name;
     private Integer age;
 

src/main/java/com/example/mybatisdemo/repository/IUserRepository.java

@@ -0,0 +1,14 @@
+package com.example.mybatisdemo.repository;
+
+import com.example.mybatisdemo.pojo.entity.User;
+import com.example.mybatisdemo.pojo.vo.UserVO;
+
+import java.util.List;
+
+public interface IUserRepository {
+    int addUser(User user);
+    int deleteUserById(int id);
+    int updateUser(User user);
+    User selectById(int id);
+    List<User> selectByName(String name);
+}

src/main/java/com/example/mybatisdemo/repository/UserRepository.java

@@ -0,0 +1,46 @@
+package com.example.mybatisdemo.repository;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.example.mybatisdemo.mapper.UserMapper;
+import com.example.mybatisdemo.pojo.entity.User;
+import com.example.mybatisdemo.pojo.vo.UserVO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public class UserRepository implements IUserRepository{
+
+    @Autowired
+    private UserMapper userMapper;
+
+    @Override
+    public int addUser(User user) {
+        return userMapper.insert(user);
+    }
+
+    @Override
+    public int deleteUserById(int id) {
+        return userMapper.deleteById(id);
+    }
+
+    @Override
+    public int updateUser(User user) {
+        return userMapper.updateById(user);
+    }
+
+    @Override
+    public User selectById(int id) {
+        return userMapper.selectById(id);
+    }
+
+
+    @Override
+    public List<User> selectByName(String name) {
+        QueryWrapper<User> wrapper = new QueryWrapper<>();
+        wrapper.eq("name", name);
+        return userMapper.selectList(wrapper);
+    }
+
+}

src/main/java/com/example/mybatisdemo/result/JsonResult.java

@@ -0,0 +1,30 @@
+package com.example.mybatisdemo.result;
+
+import lombok.Data;
+
+@Data
+public class JsonResult {
+
+
+    private String message;
+    private Object data;
+
+    public static JsonResult ok(){
+        return JsonResult.ok(null);
+    }
+
+
+    public static JsonResult ok(Object data) {
+        JsonResult jsonResult = new JsonResult();
+        jsonResult.message = "操作成功";
+        jsonResult.data = data;
+        return jsonResult;
+    }
+
+
+    public static JsonResult fail(){
+        JsonResult jsonResult = new JsonResult();
+        jsonResult.message = "操作失败";
+        return jsonResult;
+    }
+}

src/main/java/com/example/mybatisdemo/service/IUserService.java

@@ -0,0 +1,12 @@
+package com.example.mybatisdemo.service;
+
+import com.example.mybatisdemo.pojo.dto.UserDTO;
+import com.example.mybatisdemo.result.JsonResult;
+
+public interface IUserService {
+    JsonResult insertUser(UserDTO userDTO);
+    JsonResult deleteUser(UserDTO userDTO);
+    JsonResult updateUser(UserDTO userDTO);
+    JsonResult selectUserById(UserDTO userDTO);
+    JsonResult selectUserByName(UserDTO userDTO);
+}

src/main/java/com/example/mybatisdemo/service/UserService.java

@@ -0,0 +1,54 @@
+package com.example.mybatisdemo.service;
+
+import com.example.mybatisdemo.pojo.dto.UserDTO;
+import com.example.mybatisdemo.pojo.entity.User;
+import com.example.mybatisdemo.repository.IUserRepository;
+import com.example.mybatisdemo.result.JsonResult;
+import org.springframework.beans.BeanUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class UserService implements IUserService{
+    @Autowired
+    private IUserRepository iUserRepository;
+
+
+    @Override
+    public JsonResult insertUser(UserDTO userDTO) {
+        User user = new User();
+        BeanUtils.copyProperties(userDTO,user);
+        int count = iUserRepository.addUser(user);
+        return (count!=0)?JsonResult.ok():JsonResult.fail();
+    }
+
+    @Override
+    public JsonResult deleteUser(UserDTO userDTO) {
+        int count = iUserRepository.deleteUserById(userDTO.getId());
+        return (count!=0)?JsonResult.ok():JsonResult.fail();
+    }
+
+    @Override
+    public JsonResult updateUser(UserDTO userDTO) {
+        User user = new User();
+        BeanUtils.copyProperties(userDTO,user);
+        int count = iUserRepository.updateUser(user);
+        return (count!=0)?JsonResult.ok():JsonResult.fail();
+    }
+
+    @Override
+    public JsonResult selectUserById(UserDTO userDTO) {
+        User user = iUserRepository.selectById(userDTO.getId());
+        return (user!=null)?JsonResult.ok(user):JsonResult.fail();
+    }
+
+    @Override
+    public JsonResult selectUserByName(UserDTO userDTO) {
+        List<User> users = iUserRepository.selectByName(userDTO.getName());
+        return (users!=null)?JsonResult.ok(users):JsonResult.fail();
+    }
+
+
+}

src/main/resources/application.properties

@@ -1,5 +1,4 @@
 spring.datasource.url=jdbc:mysql://192.168.0.188:55306/bakljy
 spring.datasource.username=root
 spring.datasource.password=!QAZ1qaz
-
-mybatis.mapper-locations=classpath:mappers/*.xml
+mybatis-plus.mapper-locations=classpath:mappers/*.xml

src/main/resources/mappers/UserMapper.xml

@@ -3,25 +3,5 @@
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace= "com.example.mybatisdemo.mapper.UserMapper">
-    <select id="selectById" resultType="com.example.mybatisdemo.pojo.vo.UserVO">
-        SELECT name,age
-        FROM user
-        WHERE id=#{id};
-    </select>
 
-    <insert id="insert">
-        INSERT INTO user(id, name, age)
-        VALUES (NULL,#{name},#{age})
-    </insert>
-
-    <update id="updateById">
-        UPDATE user SET
-            name = #{name},
-            age = #{age}
-        WHERE id = #{id}
-    </update>
-
-    <delete id="deleteById">
-        DELETE FROM user WHERE id = #{id}
-    </delete>
 </mapper>

src/test/java/com/example/mybatisdemo/MybatisDemoApplicationTests.java

@@ -1,5 +1,6 @@
 package com.example.mybatisdemo;
 
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.example.mybatisdemo.mapper.UserMapper;
 import com.example.mybatisdemo.pojo.dto.UserDTO;
 import com.example.mybatisdemo.pojo.entity.User;
@@ -9,6 +10,8 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.test.context.SpringBootTest;
 
+import java.util.List;
+
 @SpringBootTest
 class MybatisDemoApplicationTests {
 
@@ -16,34 +19,42 @@ class MybatisDemoApplicationTests {
     private UserMapper userMapper;
 
     @Test
-    void selectByIdTest() {
-        UserVO userVO = userMapper.selectById(1);
-        System.out.println(userVO);
+    void insert(){
+        User user = new User();
+        user.setName("hanrenchun");
+        user.setAge(100);
+        int insert = userMapper.insert(user);
+        System.out.println("添加了"+insert+"条数据");
     }
 
     @Test
-    void insert(){
+    void update(){
         User user = new User();
+        user.setId(27);
         user.setName("hrc");
-        user.setAge(23);
-        int count = userMapper.insert(user);
-        System.out.println("添加了"+count+"条数据");
+        user.setAge(123);
+        int i = userMapper.updateById(user);
+        System.out.println("修改了"+i+"条数据");
     }
 
     @Test
-    void update(){
-        UserDTO userDTO = new UserDTO();
-        userDTO.setAge(18);
-        userDTO.setName("hanrenchun");
-        userDTO.setId(19);
-        int count = userMapper.updateById(userDTO);
-        System.out.println("修改了"+count+"条数据");
+    void select(){
+        User user = userMapper.selectById(27);
+        System.out.println(user);
     }
 
     @Test
     void delete(){
-        int count = userMapper.deleteById(19);
-        System.out.println("删除了"+count+"条数据");
+        int i = userMapper.deleteById(28);
+        System.out.println("删除了"+i+"条数据");
+    }
+
+    @Test
+    void selectList(){
+        QueryWrapper<User> wrapper = new QueryWrapper<>();
+        wrapper.eq("name", "yu");
+        List<User> users = userMapper.selectList(wrapper);
+        System.out.println(users);
     }
 
 }