SpringBoot热部署和整合Mybatis的过程

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student`  (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `sex` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `address` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
 
-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (1, 'LYL', '男', '广州');
INSERT INTO `student` VALUES (2, 'HQX', '女', '揭阳');

package com.example.springbootdemo3.pojo;
public class Student {
    private int id;
    private String name;
    private String sex;
    private String address;
    public Student() {
    }
    public Student(int id, String name, String sex, String address) {
        this.id = id;
        this.name = name;
        this.sex = sex;
        this.address = address;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    @Override
    public String toString() {
        return "Student [" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", address='" + address + '\'' +
                " ]";
    }
}

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.3.0</version>
</dependency>

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

# 配置数据源
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql:///student?serverTimezone=UTC
    username: root
    password: 666666
# mybatis配置
mybatis:
  # 映射文件位置
  mapper-locations: com/example/springbootdemo3/mapper/*Mapper.xml
  # 别名
  type-aliases-package: com.example.springbootdemo3.pojo
#日志格式
logging:
  pattern:
    console: '%d{YYYY-MM-dd HH:mm:ss.SSS} %clr(%-5level) --- [%-15thread]%cyan(%-50logger{50}):%msg%n'

package com.example.springbootdemo3.mapper;
 
import com.example.springbootdemo3.pojo.Student;
import org.apache.ibatis.annotations.Mapper;
 
import java.util.List;
 
@Mapper
public interface StudentMapper {
    List<Student> findAll();
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.springbootdemo3.mapper.StudentMapper">
    <select id="findAll" resultType="com.example.springbootdemo3.pojo.Student">
        select * from student;
    </select>
</mapper>

package com.example.springbootdemo3.mapper;
import com.example.springbootdemo3.pojo.Student;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
@SpringBootTest
public class StudentMapperTest {
    @Autowired
    private StudentMapper studentMapper;
    @Test
    public void testFindAll(){
        List<Student> students = studentMapper.findAll();
        students.forEach(System.out::println);
    }
}