IDEA+mybatis实现增删改查(CURD)
作者：互联网
原文链接：这里
0.前言
操作mybaits和mysql进行增删改查是必备的一步，今天写一篇文章简单记录一下mybatis的增删改查操作。
1.具体操作
studnetsMapper文件
package com.cat.dao; import com.cat.pojo.Students; import java.util.List; public interface StudentsMapper { //所有学生 List<Students> listAllStudents(); //删除一名学生信息 int deleteStudent(int id); //新增一名学生 int addStudent(Students students); //修改一名学生信息 int updateStudentById(Students students); }StudentsMapper.xml文件
<?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.cat.dao.StudentsMapper"> <!--展示所有学生--> <select id="listAllStudents" resultType="com.cat.pojo.Students"> select * from students; </select> <!--删除一条学生信息--> <delete id="deleteStudent" parameterType="int"> delete from students where id = #{id} </delete> <!--增加一名学生信息--> <insert id="addStudent" parameterType="com.cat.pojo.Students"> insert into students(stu_name,stu_sex,class_id,age) values (#{stu_name},#{stu_sex},#{class_id},#{age}) </insert> <!--更新一名学生的信息--> <update id="updateStudentById" parameterType="com.cat.pojo.Students"> update students set stu_name= #{stu_name}, stu_sex= #{stu_sex}, class_id =#{class_id}, age=#{age} where id =#{id} </update> </mapper>Test文件
package com.cat.test; import com.cat.dao.StudentsMapper; import com.cat.pojo.Students; 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 org.junit.Test; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.List; import java.util.Map; public class MyBatisTest { //输出所有学生信息 @Test public void test() throws IOException{ //获得核心配置文件 InputStream in = Resources.getResourceAsStream("MyBatisConfig.xml"); //获得session工厂对象 SqlSessionFactoryBuilder builder =new SqlSessionFactoryBuilder(); SqlSessionFactory factory=builder.build(in); SqlSession session =factory.openSession(); //获得会话对象 List<Students> students =session.selectList("listAllStudents"); System.out.println(students); session.close(); //关闭 } //测试删除一名学生信息 @Test public void deleteStudent() throws IOException{ //获得核心配置文件 InputStream in = Resources.getResourceAsStream("MyBatisConfig.xml"); //获得session工厂对象 SqlSessionFactoryBuilder builder =new SqlSessionFactoryBuilder(); SqlSessionFactory factory=builder.build(in); SqlSession session =factory.openSession(); //获得会话对象 StudentsMapper studentsMapper = session.getMapper(StudentsMapper.class); studentsMapper.deleteStudent(1000); //调用deleteStudent方法，删除id是1000的这个学生 session.close(); //关闭 } //新增一名学生信息 @Test public void addStudent() throws IOException{ //获得核心配置文件 InputStream in = Resources.getResourceAsStream("MyBatisConfig.xml"); //获得session工厂对象 SqlSessionFactoryBuilder builder =new SqlSessionFactoryBuilder(); SqlSessionFactory factory=builder.build(in); SqlSession session =factory.openSession(); //获得会话对象 StudentsMapper studentsMapper = session.getMapper(StudentsMapper.class); //构造一个新的学生 Students s =new Students(); s.setStu_name("呵呵"); s.setClass_id(1042); s.setAge(16); s.setStu_sex("男"); int res = studentsMapper.addStudent(s); //调用 session.commit(); //增删改必须提交事务 session.close(); //关闭 } //修改一名学生信息 @Test public void updateStudent() throws IOException{ //获得核心配置文件 InputStream in = Resources.getResourceAsStream("MyBatisConfig.xml"); //获得session工厂对象 SqlSessionFactoryBuilder builder =new SqlSessionFactoryBuilder(); SqlSessionFactory factory=builder.build(in); SqlSession session =factory.openSession(); //获得会话对象 StudentsMapper studentsMapper = session.getMapper(StudentsMapper.class); //把原来的学生信息修改 Students s= new Students(); s.setId(1001); //定向修改id是1001的学生 s.setStu_name("李十三"); //这个人的名字改成李十三 s.setStu_sex("男"); //性别改为男 s.setAge(24); //年龄修改为24 s.setClass_id(3002); int res = studentsMapper.updateStudentById(s); //调用 session.commit(); //增删改必须提交事务 session.close(); //关闭 } }标签：StudentsMapper,builder,改查,IDEA,CURD,session,import,SqlSessionFactoryBuilder,id 来源： https://www.cnblogs.com/longkui-site/p/15858494.html