Springboot集成mybatis通用Mapper

文件结构如下

导入的依赖

<dependencies>

        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.1.5</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

配置

spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
  type-aliases-package: com.duofan.mybatis.persistence.beans
  mapper-locations: classpath:/mybatis/*.xml

StudentMapper

package com.duofan.mybatis.persistence.mapper;

import com.duofan.mybatis.persistence.beans.Student;
import org.springframework.stereotype.Repository;
import tk.mybatis.mapper.common.Mapper;

import java.util.List;

/**
 * @author duofan  [email protected]
 */
@Repository
public interface StudentMapper extends Mapper<Student> {
    /**
     * 获取所有学生
     * @return
     */
    List<Student> getAllStudent();
}

StudentMapper.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.duofan.mybatis.persistence.mapper.StudentMapper">
    <resultMap id="rm" type="com.duofan.mybatis.persistence.beans.Student">
        <result property="id" jdbcType="BIGINT" column="id"/>
        <result property="name" jdbcType="VARCHAR" column="name"/>
        <result property="sex" jdbcType="VARCHAR" column="sex"/>
        <result property="age" jdbcType="BIGINT" column="age"/>
    </resultMap>

    <select id="getAllStudent" resultType="com.duofan.mybatis.persistence.beans.Student">
        SELECT * FROM STUDENT
    </select>

</mapper>

测试代码

package com.duofan.mybatis;

import com.duofan.mybatis.persistence.beans.Student;
import com.duofan.mybatis.persistence.mapper.StudentMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import tk.mybatis.spring.annotation.MapperScan;

import java.util.List;

@SpringBootTest
// MapperScan 必须是tk.mybaits 下的mapperscan
@MapperScan("com.duofan.mybatis.persistence.mapper")
class MybatisApplicationTests {

    @Autowired
    private StudentMapper studentMapper;
    @Test
    void contextLoads() {
        System.out.println("Mapper 查询");
        List<Student> students = studentMapper.selectAll();
        students.forEach(student -> System.out.println(student));

        System.out.println("mybatis xml查询");
        List<Student> allStudent = studentMapper.getAllStudent();
        allStudent.forEach(student -> System.out.println(student));
    }

}

输出结果