SpringBoot使用mybatis SpringBoot使用mybatis步骤总结
冷血～多好 人气:0想了解SpringBoot使用mybatis步骤总结的相关内容吗，冷血～多好在本文为您仔细讲解SpringBoot使用mybatis的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：SpringBoot使用mybatis,SpringBoot整合mybatis，下面大家一起来学习吧。
SpringBoot使用mybatis
1.导入 MyBatis 所需要的依赖
<!--mybatis-spring-boot-starter:整合-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
2.配置数据库连接信息(application.properties)
spring.datasource.username=root spring.datasource.password=123 spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8 spring.datasource.driver-class-name=com.mysql.jdbc.Driver
测试：
@SpringBootTest
class Springboot05MybatisApplicationTests {
@Autowired
DataSource dataSource;
@Test
void contextLoads() throws SQLException {
System.out.println(dataSource.getClass());
System.out.println(dataSource.getConnection());
}
}
打印出：class com.zaxxer.hikari.HikariDataSource
HikariProxyConnection@1172943149 wrapping com.mysql.jdbc.JDBC4Connection@3dc95b8b
说明配置完成
3.然后进行crud操作：
先编写一个实体类：（注意这里使用了lombok插件)
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private int id;
private String name;
private String pwd;
}
创建mapper目录以及对应的 Mapper 接口
import com.chen.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
//这个注解表示了这时一个mybatis的mapper类：Dao
@Mapper
@Repository
public interface UserMapper {
List<User> queryUserList();
User queryUserById(int id);
int addUSer(User user);
int updateUser(User user);
int deleteUser(int id);
}
对应的Mapper映射文件
<?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.chen.mapper.UserMapper">
<!--select查询语句-->
<!--id为方法名,resultType为结果返回类型-->
<select id="queryUserList" resultType="User">
select * from mybatis.user;
</select>
<!--通过id进行select查询语句，parameterType为传参类型，resultType为结果返回类型-->
<select id="queryUserById" parameterType="int" resultType="User">
select *from mybatis.user where id=#{id};
</select>
<!--插入语句，对象中的属性，可以直接取出来-->
<insert id="addUSer" parameterType="User" >
insert into mybatis.user(name,pwd) values (#{name},#{pwd});
</insert>
<!--更改用户语句-->
<insert id="updateUser" parameterType="User" >
update mybatis.user set name =#{name},pwd=#{pwd} where id=#{id};
</insert>
<!--删除用户-->
<delete id="deleteUser" parameterType="int">
delete from mybatis.user where id=#{id};
</delete>
</mapper>
编写用户的UserController 进行测试！
import com.chen.mapper.UserMapper;
import com.chen.pojo.User;
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;
@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;
}
//添加一个用户
@GetMapping("/addUser")
public String addUser(){
int n=userMapper.addUSer(new User(5,"阿毛","4566977"));
return String.valueOf(n);
}
//修改一个用户
@GetMapping("/updateUser")
public String updateUser(){
int n=userMapper.updateUser(new User(5,"阿毛","4566977"));
return String.valueOf(n);
}
//删除一个用户
@GetMapping("/deleteUser")
public String deleteUser(){
int n=userMapper.deleteUser(18);
return String.valueOf(n);
}
}
最后创建该实体类数据库：mybatis
DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(25) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL, `pwd` varchar(25) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 18 CHARACTER SET = gbk COLLATE = gbk_chinese_ci ROW_FORMAT = Compact; -- ---------------------------- -- Records of user -- ---------------------------- INSERT INTO `user` VALUES (3, '小黑', '789'); INSERT INTO `user` VALUES (4, '可可2', '151'); INSERT INTO `user` VALUES (5, '阿毛', '4566977'); INSERT INTO `user` VALUES (6, '小明', 'cafa1414f'); INSERT INTO `user` VALUES (7, '嘻嘻3', '101112'); INSERT INTO `user` VALUES (8, '很爱很爱你', '101112'); INSERT INTO `user` VALUES (9, '小霞', '159'); INSERT INTO `user` VALUES (10, '嘻嘻5', '101112'); INSERT INTO `user` VALUES (11, '陈锦贤', 'dad45'); INSERT INTO `user` VALUES (12, '陈锦贤2', 'd2ad45'); INSERT INTO `user` VALUES (13, '小明', '123456'); INSERT INTO `user` VALUES (14, '小明2', '456'); INSERT INTO `user` VALUES (17, '阿毛', '4566977'); SET FOREIGN_KEY_CHECKS = 1;
然后就可以启动项目进行测试了：
浏览器打开：
http://localhost:8080/queryUserList
其它的删除，添加，修改也是如此！
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