spring boot 2.0.1整合MyBatis

1.导入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf-spring5</artifactId>
</dependency>2.定义数据源
spring.thymeleaf.cache=false
spring.datasource.url=jdbc:mysql://localhost:3306/blogdata?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.type-aliases-package=com.example.bean //模型类包
3.目录结构



4.User.class
package com.example.bean;

public class User {
private int id;
private String email;
private String nickname;
private String password;

public User() {
}

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

public int getId() {
return id;
}
public void setEmail(String email) {
this.email = email;
}

public String getEmail() {
return email;
}

public void setNickname(String nickname) {
this.nickname = nickname;
}

public String getNickname() {
return nickname;
}

public void setPassword(String password) {
this.password = password;
}

public String getPassword() {
return password;
}

// Getter、Setter
}UserMapper.class
package com.example.mapper;

import com.example.bean.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

// @Mapper 这里可以使用@Mapper注解，但是每个mapper都加注解比较麻烦，所以统一配置@MapperScan在扫描路径在application类中
public interface UserMapper {

@Select("SELECT * FROM user_info WHERE id = #{id}")
User getUserById(Integer id);

@Select("SELECT * FROM us
4000
er_info")
public List<User> getUserList();

@Insert("insert into tb_user(username, age, ctm) values(#{username}, #{age}, now())")
public int add(User user);

@Update("UPDATE tb_user SET username = #{user.username} , age = #{user.age} WHERE id = #{id}")
public int update(@Param("id") Integer id, @Param("user") User user);

@Delete("DELETE from tb_user where id = #{id} ")
public int delete(Integer id);
}UserService.class
package com.example.service;

import com.example.bean.User;
import org.springframework.stereotype.Service;

import java.util.List;

/**
* @ClassName cn.saytime.service.UserService
* @Description
*/
public interface UserService {

User getUserById(Integer id);

public List<User> getUserList();

public int add(User user);

public int update(Integer id, User user);

public int delete(Integer id);
}UserServiceimpl.class
package com.example.service.impl;

import com.example.bean.User;
import com.example.mapper.UserMapper;
import com.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
* @ClassName cn.saytime.service.impl.UserServiceImpl
* @Description
*/
@Service
public class UserServiceimpl implements UserService {

@Autowired
private UserMapper userMapper;

@Override
public User getUserById(Integer id) {
return userMapper.getUserById(id);
}

@Override
public List<User> getUserList() {
return userMapper.getUserList();
}

@Override
public int add(User user) {
return userMapper.add(user);
}

@Override
public int update(Integer id, User user) {
return userMapper.update(id, user);
}

@Override
public int delete(Integer id) {
return userMapper.delete(id);
}
}UserController.class
package com.example.web;

import com.example.bean.User;
import com.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {

@Autowired
private UserService userService;

@RequestMapping(value = "/g")
public List<User> ha(){

return userService.getUserList();
}
}PS:入口类一定要放在众包之上。