数据库表创建+数据添加
sql
-- 创建学生信息表
CREATE TABLE `student` (
`id` BIGINT PRIMARY KEY NOT NULL AUTO_INCREMENT COMMENT '自增主键ID',
`studNo` VARCHAR(20) NOT NULL COMMENT '学号',
`name` VARCHAR(50) NOT NULL COMMENT '姓名',
`gender` INT DEFAULT 0 COMMENT '性别：0-未知 1-男 2-女',
`phone` VARCHAR(20) COMMENT '联系电话',
`home_address` VARCHAR(255) COMMENT '家庭住址',
`class_name` VARCHAR(50) COMMENT '班级名称',
`status` INT UNSIGNED DEFAULT 1 COMMENT '学籍状态：1-在读 2-休学 3-毕业 4-退学 5-开除'
) COMMENT='学生基本信息表';
INSERT INTO `student_info`
(`studNo`, `name`, `gender`, `phone`, `home_address`, `class_name`, `status`)
VALUES
('202301001', '张明', 1, '13800138001', '浙江省杭州市', '计算机科学与技术2023级1班', 1),
('202301002', '李婷', 2, '13800138002', '辽宁省大连市', '计算机科学与技术2023级1班', 1),
('202302015', '王浩', 1, '13800138003', '北京市', '软件工程2023级2班', 1),
('202201023', '赵晓雨', 2, '13800138004', '上海市', '计算机科学与技术2022级1班', 2),
('202103008', '刘阳', 1, '13800138005', '山东省青岛市', '软件工程2021级3班', 3);Java代码实现
项目结构
mybatis配置文件
java
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="db.properties"/>
<environments default="dev">
<environment id="dev">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="cn/stud/mapper/StudentMapper.xml"/>
</mappers>
</configuration><mapper>中需要写入创建的mapper实现xml路径名，才可以访问到
使用${} 将数据库连接内容（db.properties）编译进去db.properties
这个文件中需要配置自己的数据库信息，数据库名，用户名，密码，我这边用的是MySQL5.1版本，将useSSL=false进行拼接，表示禁用 SSL 加密，低版本一般这样设置
xml
driver=com.mysql.jdbc.Driver
url=jdbc:mysql:///local_data?useSSL=false
username=root
password=123456SqlSession工具类
java
package cn.stud.util;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.InputStream;
public class MybatisConnUtils {
private static SqlSessionFactory ssf;
static {
//获取连接对象
try (InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml")) {
//获取sqlSession会话工厂
ssf = new SqlSessionFactoryBuilder().build(inputStream);
}catch (Exception e){
throw new RuntimeException(e);
}
}
//获取连接
public static SqlSession getConn(){
return ssf.openSession();
}
}Student实体类
java
package cn.stud.domain;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@NoArgsConstructor
@AllArgsConstructor
@Data
public class Student {
//自增主键ID
private long id;
//学号
private String studNo;
//姓名
private String name;
//性别：0-未知 1-男 2-女
private int gender;
//联系电话
private String phone;
//家庭住址
private String home_address;
//班级名称
private String class_name;
//学籍状态：1-在读 2-休学 3-毕业 4-退学 5-开除
private int status;
}DAO接口
java
package cn.stud.dao;
import cn.stud.domain.Student;
import java.util.List;
public interface StudentDAO {
void insert(Student s);
void update(Student s);
void del(long id);
Student getById(long id);
List<Student> getAll();
}DAO实现类
java
package cn.stud.dao.impl;
import cn.stud.dao.StudentDAO;
import cn.stud.domain.Student;
import cn.stud.util.MybatisConnUtils;
import org.apache.ibatis.session.SqlSession;
import java.util.List;
public class StudentDAOImpl implements StudentDAO {
private static SqlSession ss = MybatisConnUtils.getConn();
@Override
public void insert(Student s) {
ss.insert("cn.stud.mapper.StudentMapper.insert",s);
ss.commit();
}
@Override
public void update(Student s) {
ss.update("cn.stud.mapper.StudentMapper.update",s);
ss.commit();
}
@Override
public void del(long id) {
ss.delete("cn.stud.mapper.StudentMapper.del",id);
ss.commit();
}
@Override
public Student getById(long id) {
return ss.selectOne("cn.stud.mapper.StudentMapper.getById",id);
}
@Override
public List<Student> getAll() {
return ss.selectList("cn.stud.mapper.StudentMapper.getAll");
}
}mapper
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="cn.stud.mapper.StudentMapper">
<insert id="insert" useGeneratedKeys="true" keyColumn="id" keyProperty="id">
insert into student(studNo,name,gender,phone,home_address,class_name,status)
values(
#{studNo},
#{name},
#{gender},
#{phone},
#{home_address},
#{class_name},
#{status}
)
</insert>
<update id="update">
update student set
studNo = #{studNo},
name = #{name},
gender = #{gender},
phone = #{phone},
home_address = #{home_address},
class_name = #{class_name},
status = #{status}
where id = #{id}
</update>
<delete id="del">
delete from student where id = #{id}
</delete>
<select id="getById" resultType="cn.stud.domain.Student">
select id,studNo,name,gender,phone,home_address,class_name,status
from student where id = #{id}
</select>
<select id="getAll" resultType="cn.stud.domain.Student">
select id,studNo,name,gender,phone,home_address,class_name,status
from student
</select>
</mapper>测试类
java
package cn.stud.dao.impl;
import cn.stud.dao.StudentDAO;
import cn.stud.domain.Student;
import org.junit.Test;
import static org.junit.Assert.*;
public class StudentDAOImplTest {
private StudentDAO sd = new StudentDAOImpl();
@Test
public void insert() {
Student student = new Student();
student.setStudNo("a1234");
student.setName("张张");
student.setGender(1);
student.setPhone("13321211111");
student.setHome_address("住址");
student.setClass_name("计算机");
student.setStatus(1);
sd.insert(student);
}
@Test
public void update() {
Student student = new Student();
student.setStudNo("a12345");
student.setName("张张1");
student.setGender(0);
student.setPhone("13321211100");
student.setHome_address("住址0");
student.setClass_name("计算机8");
student.setStatus(2);
sd.update(student);
}
@Test
public void del() {
sd.del(6L);
}
@Test
public void getById() {
System.out.println(sd.getById(2L));
}
@Test
public void getAll() {
sd.getAll().forEach(System.out::println);
}
}