SpringBoot-2整合MyBatis以及基本的使用方法
目录
1.引入依赖
2.数据库表的创建
3.数据源的配置
4.编写pojo类
5.编写controller类
6.编写接口
7.编写接口的实现类
8.编写mapper
1.引入依赖
在pom.xml引入依赖
<!-- mysql-->
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
</dependency>
<!--mybaits-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>3.0.3</version>
</dependency>
<!-- lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>2.数据库表的创建
create database SpringbootDB;
use SpringbootDB;
CREATE TABLE users (
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(50) NOT NULL UNIQUE,
password VARCHAR(255) NOT NULL,
phone VARCHAR(15) NOT NULL UNIQUE,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
INSERT INTO users (username, password, phone) VALUES
('张三', 'hashed_abc123', '13800138000'),
('李四', 'hashed_def456', '13800138001');3.数据源的配置
在yml文件配置
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/springbootdb
username: root
password: 12344.编写pojo类
package com.leo.springboothd.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data // Lombok annotation to generate all the boilerplate that is normally associated with simple POJOs (Plain Old Java Objects), including getters, setters, equals, hash, and toString methods.
@NoArgsConstructor // Lombok annotation to create an empty constructor.
@AllArgsConstructor // Lombok annotation to create a constructor with all properties as arguments.
public class User {
private String username; // 用户名
private String password; // 密码
private String phone; // 电话号码
// 注意：这里没有包含'id'和'created_at'字段，因为它们在原始请求中被省略了。
// 如果需要与数据库中的表进行映射，请确保这些字段的存在与否符合你的需求。
}package com.leo.springboothd.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result {
private Integer code;//响应码，1 代表成功; 0 代表失败
private String msg; //响应信息 描述字符串
private Object data; //返回的数据
//增删改 成功响应
public static Result success(){
return new Result(0,"success",null);
}
//查询 成功响应
public static Result success(Object data){
return new Result(0,"success",data);
}
//失败响应
public static Result error(String msg){
return new Result(1,msg,null);
}
}
5.编写controller类
package com.leo.springboothd.Controller;
import com.leo.springboothd.pojo.Result;
import com.leo.springboothd.pojo.User;
import com.leo.springboothd.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@Slf4j
@RestController
public class UserController {
@Autowired
private UserService userService;
@PostMapping("/register")
public Result add(@RequestBody User user) {
log.info("注册信息{}",user);
userService.add(user);
System.out.println("用户新增成功"+user);
return Result.success();
}
@PostMapping("/login")
public Result login(@RequestBody User user) {
log.info("登录信息{}",user);
User userResult=userService.login(user);
if(userResult==null){
System.out.println("没有此用户");
return Result.error("没有此用户");
}
else{
System.out.println("用户登录成功"+user);
return Result.success("登录成功");
}
}
@GetMapping("/getall")
public Result getall() {
log.info("执行查询所有的Users操作");
List<User> users= userService.getall();
return Result.success(users);
}
}
6.编写接口
package com.leo.springboothd.service.impl;
import com.leo.springboothd.mapper.UserMapper;
import com.leo.springboothd.pojo.User;
import com.leo.springboothd.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl1 implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public void add(User user) {
userMapper.add(user);
}
@Override
public List<User> getall() {
return userMapper.getall();
}
@Override
public User login(User user) {
return userMapper.login(user);
}
}
7.编写接口的实现类
package com.leo.springboothd.service.impl;
import com.leo.springboothd.mapper.UserMapper;
import com.leo.springboothd.pojo.User;
import com.leo.springboothd.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl1 implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public void add(User user) {
userMapper.add(user);
}
@Override
public List<User> getall() {
return userMapper.getall();
}
@Override
public User login(User user) {
return userMapper.login(user);
}
}
8.编写mapper
package com.leo.springboothd.mapper;
import com.leo.springboothd.pojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import java.util.List;
@Mapper
public interface UserMapper {
@Insert("insert into users (username, password, phone) values (#{username}, #{password}, #{phone})")
void add(User user);
@Select("select * from users")
List<User> getall();
@Select("select * from users where username=#{username} and password=#{password}")
User login(User user);
}