mybatis-plus-demo

准备工作
UserController
- 自定义Sql

准备工作

实体类User

package com.example.demo.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;

@TableName("user")
public class User {
    @TableId(type = IdType.AUTO)
    private Long id;
    private String name;
    private Integer age;
    private String email;

    // Getters and Setters
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

UserMapper

package com.example.demo.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.demo.entity.User;

public interface UserMapper extends BaseMapper<User> {
}

UserService

package com.example.demo.service;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;
import org.springframework.stereotype.Service;

@Service
public class UserService extends ServiceImpl<UserMapper, User> {
}

UserController

CRUD
Page
自定义SQL

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/users")
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping
    public User createUser(@RequestBody User user) {
        userService.save(user);
        return user;
    }

    @GetMapping("/{id}")
    public User getUser(@PathVariable Long id) {
        return userService.getById(id);
    }

    @PutMapping("/{id}")
    public User updateUser(@PathVariable Long id, @RequestBody User user) {
        user.setId(id);
        userService.updateById(user);
        return user;
    }

    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable Long id) {
        userService.removeById(id);
    }

    @GetMapping
    public List<User> getAllUsers() {
        return userService.list();
    }

    // 分页查询
    @GetMapping("/page")
    public IPage<User> getUsersByPage(@RequestParam int pageNum, @RequestParam int pageSize) {
        Page<User> page = new Page<>(pageNum, pageSize);
        return userService.page(page);
    }
    // 条件查询
    @GetMapping("/search")
    public List<User> searchUsers(@RequestParam String name, @RequestParam Integer age) {
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.like("name", name).eq("age", age);
        return userService.list(queryWrapper);
    }

}

自定义Sql

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserMapper extends BaseMapper<User> {

    @Select("SELECT * FROM user WHERE age > #{age}")
    List<User> selectUsersOlderThan(int age);
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService extends ServiceImpl<UserMapper, User> {

    @Autowired
    private UserMapper userMapper;

    public List<User> getUsersOlderThan(int age) {
        return userMapper.selectUsersOlderThan(age);
    }
}

mybatis-plus-demo

Table of Contents

准备工作

实体类User

UserMapper

UserService

UserController

自定义Sql