新建一个Spring boot 项目。
1.引入依赖
<!-- 需要去仓库搜索添加 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 实体类这注解简写工具 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
- 配置数据库
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# 这里使用的是MySql 8.0.15 数据库,需要加时区，保证自己的数据库db_jdbc 存在。
spring.datasource.url=jdbc:mysql://localhost:3306/db_mybatis?\
useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=666666
# 整合Mybatis
# 检查mybatis 配置文件是否存在
mybatis.check-config-location=true
# 配置别名
mybatis.type-aliases-package=com.zdy.springboot.pojo
# 配置文件位置
# mybatis.config-location=classpath:mybatis/mybatis-config.xml
#配置mybatis 映射文件位置
mybatis.mapper-locations=classpath:mybatis/mapper/*Mapper.xml
数据库sql
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_name` varchar(255) NOT NULL,
`user_password` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'zhangsan', '322');
INSERT INTO `user` VALUES ('2', 'lisi', '353534');
测试数据库配置
@SpringBootTest
class Springboot03MybatisApplicationTests {
@Autowired
private DataSource dataSource;
@Test
void contextLoads() throws SQLException {
System.out.println(dataSource.getClass());
System.out.println(dataSource.getConnection());
}
}
- 创建实体类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private int id;
private String user_name;
private String user_password;
}
- 创建Usermapper接口
package com.zdy.springboot.mapper;
import com.zdy.springboot.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* @author deyou
* @create 2020-03-29 10:29 AM
*/
//这个注解表示了这是一个mybatis 的注解类
@Mapper
@Repository
public interface UserMapper {
User findUserByname(String username);
//参数绑定问题参数名要和map
void updateUserByName( String user_name, String user_password);
void deleteUserByName(String username);
void saveUser(User user);
List<User> getUserList();
/*基于注解的2个方法*/
//查询所用用户信息
@Select("select * from user")
List<User> findAllUser();
@Select("select * from user where id=#{myId}")
User findUserById(@Param("myId") int id);
}
- 创建映射文件UserMapper.xml
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zdy.springboot.mapper.UserMapper">
<select id="findUserByname" resultType="User">
select * from user where user_name = #{username}
</select>
<!--springboot 里配置了-->
<select id="getUserList" resultType="User" >
select * from user
</select>
<!--名字要和user_password和user_name要和User类属性名一致，接口也是-->
<update id="updateUserByName" parameterType="User">
update user set user_password=#{user_password} where user_name=#{user_name}
</update>
<insert id="saveUser" parameterType="User">
insert into user (user_name,user_password) values (#{user_name},#{user_password})
</insert>
<delete id="deleteUserByName" parameterType="String">
delete from user where user_name=#{1}
</delete>
</mapper>
- 创建Usercontroller类
package com.zdy.springboot.controller;
import com.zdy.springboot.pojo.User;
import com.zdy.springboot.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
/**
* @author deyou
* @create 2020-03-29 10:45 AM
*/
@RestController
public class UserController {
/**
*
*/
@Autowired
private UserMapper userMapper;
//也可是使用restful 风格，这里就不使用了
//查询所有用户
//http://localhost:8080/findAllUserList
@GetMapping("findAllUserList")
public List<User> findAllUserList(){
List<User> userList = userMapper.getUserList();
//控制台数据
userList.forEach(user -> System.out.println(user));
return userList;
}
//通过名字查询用户
//http://localhost:8080/findUserByName?username=zhangsan
@GetMapping("findUserByName")
public User findUserByName(String username){
User user = userMapper.findUserByname(username);
return user;
}
//通过名字修改用户密码
//http://localhost:8080/updateUserByName?username=zhangsan&password=56666
@GetMapping("updateUserByName")
public String updateUserByName(String username,String password){
System.out.println(username);
System.out.println(password);
userMapper.updateUserByName(username,password);
return "update method success";
}
//添加用户
//http://localhost:8080/addUser?username=zhangsan&password=56666
@GetMapping("addUser")
public String addUser(String username,String password){
User user = new User(username, password);
System.out.println(username);
System.out.println(password);
userMapper.saveUser(user);
return "update method success";
}
//通过名字删除用户
//http://localhost:8080/deleteUserByName?username=zhangsan&password=56666
@GetMapping("deleteUserByName")
public String deleteUserByName(String username){
userMapper.deleteUserByName(username);
return "delete method success";
}
//http://localhost:8080/findAllUser
@GetMapping("findAllUser")
public List<User> findAllUser() {
return userMapper.findAllUser();
}
//http://localhost:8080/findUserById?id=2
@GetMapping("findUserById")
public User findUserById(int id) {
return userMapper.findUserById(id);
}
}
最后： 启动项目，在浏览器中输出Controller 方法上对应网址检测结果。
项目目录：
