SpringBoot整合Mybatis(SpringBoot3)

依赖pom.xml：

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>3.2.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>demo</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</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>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>3.0.3</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

resource包下的Application.yml:

Application.yml

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/work     #自己数据库名
    username: root
    password: 123456

mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.demo.pojo
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

pojo包下实体类User：

User

package com.demo.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString

public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

mapper包下的接口UserMapper：

UserMapper

package com.demo.mapper;

import com.demo.pojo.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {
    List<User> getAll();

    int insert(User user);

    int delete(Long id);

    int update(User user);

}

resource包下mapper映射UserMapper：

UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.demo.mapper.UserMapper">

    <select id="getAll" resultType = "User">
        select * from t_user
    </select>
    
    <insert id="insert">
        insert into t_user(id,name,age,email)
        values(#{id}, #{name}, #{age}, #{email})
    </insert>
    
    <delete id="delete">
        delete from t_user where id=#{id}
    </delete>

    <update id="update">
        update t_user set
            id=#{id},
            name=#{name},
            age=#{age},
            email=#{email}
        where id=#{id}
    </update>

</mapper>

主启动类DemoApplication：

DemoApplication

package com.demo;

import org.apache.ibatis.annotations.Mapper;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.demo.mapper") // 注意自己路径
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

测试DemoApplicationTest：

DemoApplicationTest

package com.demo;

import com.demo.mapper.UserMapper;
import com.demo.pojo.User;
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;
import java.sql.SQLOutput;
import java.util.List;

@SpringBootTest
class DemoApplicationTests {
    @Autowired
    private UserMapper userMapper;

    @Autowired
    private DataSource dataSource;
    private int count;

    @Test
    void dataSource() throws SQLException{
        System.out.println(dataSource.getConnection());
    }

    @Test
    void testGetAll() {
        List<User> list = userMapper.getAll();
        System.out.println(list);
    }

    @Test
    void testInsert(){
        User user = new User(666L, "qimiao", 22, "8712@qq.com");
        int count = userMapper.insert(user);
        System.out.println((count == 1 ? "插入成功" : "插入失败"));
    }

    @Test
    void deleteTest() {
        int count = userMapper.delete(345L);
        System.out.println((count == 1 ? "删除成功" : "删除失败"));
    }

    @Test
    void updateTest() {
        User user = new User(666L, "kuazhang", 53, "5555@qq.com");
        int count = userMapper.update(user);
        System.out.println((count == 1 ? "更新成功" : "更新失败"));
    }

}

测试结果：

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