2024.5.15 Wednesday
目录
- 13.整合MyBatis框架
- 13.1.整合测试
- 13.1.1.新建springboot-05-mybatis项目
- 13.1.2.导入MyBatis需要的依赖
- 13.1.3.配置数据库连接信息
- 13.1.3.1.修改application.properties
- 13.1.3.2.修改Springboot05MybatisApplicationTests.java并测试
- 13.1.4.新建pojo文件夹
- 13.1.4.1.新建User.java
- 13.1.4.2.修改pom.xml
- 13.1.5.新建mapper文件夹
- 13.1.6.新建UserMapper.xml
- 13.1.7.修改application.properties
- 13.1.8.新建controller文件夹
- 13.1.9.重启并运行
- 13.2.作业
- 13.2.1.把springboot-03-web的部分导入真实数据库进行完善
13.整合MyBatis框架
官方文档:http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/
Maven仓库地址:
https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter/2.2.2
我这里选择的是2.2.2版本(要和springboot版本匹配)
13.1.整合测试
13.1.1.新建springboot-05-mybatis项目
添加maven支持(在Project Structure->Modules点击加号添加对应项目),按照惯例修改settings中的maven,jdk和Java版本,Project Structure中的jdk和Java版本。修改pom中的springframework版本到2.7.13,重新加载Maven。
删除多余文件
详见https://download.csdn.net/download/2401_83329143/89303117
13.1.2.导入MyBatis需要的依赖
修改pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.13</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>springboot-05-mybatis</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot-05-mybatis</name><description>springboot-05-mybatis</description><properties><java.version>8</java.version></properties><dependencies><!-- 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><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>
13.1.3.配置数据库连接信息
13.1.3.1.修改application.properties
spring.application.name=springboot-05-mybatis
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
13.1.3.2.修改Springboot05MybatisApplicationTests.java并测试
package com.P33;import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;import javax.sql.DataSource;
import java.sql.SQLException;@SpringBootTest
class Springboot05MybatisApplicationTests {@AutowiredDataSource dataSource;@Testvoid contextLoads() throws SQLException {System.out.println(dataSource.getClass());System.out.println(dataSource.getConnection());}}
13.1.4.新建pojo文件夹
13.1.4.1.新建User.java
package com.P33.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;
}
13.1.4.2.修改pom.xml
在dependencies中添加lombok支持
<!--lombok-->
<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.16.20</version>
</dependency>
13.1.5.新建mapper文件夹
13.1.5.1.新建UserMapper.java
package com.P33.mapper;import com.P33.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;import java.util.List;@Mapper //这个注解表示了这是一个MyBatis的mapper类,或者在Springboot05MybatisApplication中添加@MapperScan("com.P33.mapper")
@Repository //储存库
public interface UserMapper {List<User> queryUserList();User queryUserById(int id);int addUser(User user);int updateUser(User user);int deleteUser(int id);
}
13.1.6.新建UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace=绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.P33.mapper.UserMapper">
<!-- 这里使用的数据库是自定义的 --><!--写<cache></cache>开启缓存--><select id="queryUserList" resultType="User">SELECT * FROM p37jdbc.users;</select><select id="queryUserById" resultType="User">SELECT * FROM p37jdbc.users WHERE id = #{id};</select><insert id="addUser" parameterType="User">INSERT INTO p37jdbc.users (id, NAME, PASSWORD) VALUES (#{id},#{name},#{pwd});</insert><update id="updateUser" parameterType="User">UPDATE p37jdbc.users SET NAME=#{name},PASSWORD = #{pwd} WHERE id = #{id};</update><delete id="deleteUser" parameterType="int">DELETE FROM p37jdbc.users WHERE id = #{id}</delete></mapper>
13.1.7.修改application.properties
配置文件不能写错!很容易因为一些小错误报500错。而且注释的#号只能在新的一行中才生效,不能接在配置行的后面(看颜色变灰了才可以)。
spring.application.name=springboot-05-mybatis
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver#整合MyBatis aliases:别名
mybatis.type-aliases-package=com.P33.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
#classpath表示总的目录,后面加:表示其子文件夹,如果是/则为同级文件夹
13.1.8.新建controller文件夹
新建UserController.java
package com.P33.controller;import com.P33.mapper.UserMapper;
import com.P33.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 {@Autowiredprivate UserMapper userMapper;//查询@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() {userMapper.addUser(new User(7,"ZzzZzz","123456"));return "finish";}//修改一个用户@GetMapping("/updateUser")public String updateUser() {userMapper.updateUser(new User(7,"ZzzZzz","999999"));return "finish";}//删除一个用户@GetMapping("/deleteUser")public String deleteUser() {userMapper.deleteUser(7);return "finish";}
}
13.1.9.重启并运行
http://localhost:8080/queryUserList
http://localhost:8080/addUser
http://localhost:8080/updateUser
http://localhost:8080/deleteUser