项目目录:
1.安装依赖包,非springboot官方
<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.2</version>
</dependency>
2.配置数据库连接
位置:src/main/resources/application.properties
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:MysqL://localhost:3306/springboot_db?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
spring.datasource.driver-class-name=com.MysqL.cj.jdbc.Driver
3.测试数据库是否连接成功
位置:src/test/java/com/harlen/TestMybatisApplicationTests.java
@SpringBoottest
class TestMybatisApplicationTests {
@Autowired
DataSource dataSource;
@Test
void contextLoads() throws sqlException {
System.out.println(dataSource.getClass());
System.out.println(dataSource.getConnection());
}
}
4.pojo(Plain Ordinary Java Object)简单的java对象:
Lombok项目是一个java库,它可以自动插入到编辑器和构建工具中,增强java的性能。不需要再写getter、setter或equals方法,只要有一个注解,你的类就有一个功能齐全的构建器、自动记录变量等等
位置:src/main/java/com/harlen/pojo/User.java
package com.harlen.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private int id;
private String name;
private String pwd;
}
5.定义接口类:
位置:src/main/java/com/harlen/mapper/UserMapper.java
/*UserMapper*/
package com.harlen.mapper;
import com.harlen.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
//这个注解表示这是mybatis的mapper(接口)类
@Mapper
@Repository
public interface UserMapper {
List<User> queryUserList();
User queryUserById(int id);
int addUser(User user);
int updateUser(User user);
int deleteUser(int id);
}
6.基于 XML 的映射语句(用来实现接口类UserMapper) :
位置:src/main/resources/mybatis/mapper/UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.harlen.mapper.UserMapper">
<select id="queryUserList" resultType="User">
select * from user
</select>
<select id="queryUserById" resultType="User">
select * from user where id=#{id}
</select>
<insert id="addUser" parameterType="User">
insert into user (id,name,pwd) values (#{id},#{name},#{pwd})
</insert>
<update id="updateUser" parameterType="User">
update user set name=#{name},pwd=#{pwd} where id=#{id}
</update>
<delete id="deleteUser" parameterType="int">
delete from user where id=#{id}
</delete>
</mapper>
7.mybatis的整合
位置:src/main/resources/application.properties
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:MysqL://localhost:3306/springboot_db?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
spring.datasource.driver-class-name=com.MysqL.cj.jdbc.Driver
#整合mybatis
mybatis.type-aliases-package=com.harlen.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
8.接口的使用
位置:src/main/java/com/harlen/controller/UserController.java
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
@GetMapping("/queryUserList")
public List<User> queryUserList(){
List<User> userList= userMapper.queryUserList();
for(User user :userList){
System.out.println(user);
}
return userList;
}
@GetMapping("/queryUserById/{id}")
public User queryUserById(@PathVariable("id") int id){
User user=userMapper.queryUserById(id);
return user;
}
}
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