关于Mybatis的sql注释问题_Sql Server

关于Mybatis的sql注释问题

2022-09-26 15:20小小白的程序员 Sql Server

这篇文章主要介绍了关于Mybatis的sql注释问题,本文通过示例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下

Mybatis的sql注释

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									//mapper下的sql注释

									package com.msb.mapper;

									import com.msb.pojo.Dept;

									import com.msb.pojo.Emp;

									import org.apache.ibatis.annotations.Delete;

									import org.apache.ibatis.annotations.Insert;

									import org.apache.ibatis.annotations.Select;

									import org.apache.ibatis.annotations.Update;

									import java.awt.*;

									public interface EmpTestMapper {

									    @Select("select * from dept where deptno =#{deptno}")

									    Dept findByDeptno(int deptno);

									    @Update("update dept set dname =#{dname}, loc =#{loc} where deptno =#{deptno}")

									    int updateDept(Dept dept);

									    @Insert("insert into dept values(DEFAULT,#{dname},#{loc})")

									    int addDept(Dept dept);

									    @Delete("delete from dept where deptno =#{deptno}")

									    int removeDept(int deptno);

									}

				?

									<?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.msb.mapper.EmpTestMapper">

									    <!--resultMap是一个映射表，对应的字段会对应数据表的字段-->

									    <!-- List<Emp> findEmp();-->

									</mapper>

				?

									import com.msb.mapper.DeptMapper;

									import com.msb.mapper.EmpMapper;

									import com.msb.mapper.EmpTestMapper;

									import com.msb.pojo.Dept;

									import com.msb.pojo.Emp;

									import com.msb.pojo.Projectrecord;

									import com.msb.pojo.Projects;

									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.After;

									import org.junit.Before;

									import org.junit.Test;

									import java.io.IOException;

									import java.io.InputStream;

									import java.util.Date;

									import java.util.List;

									public class Test1 {

									    SqlSession sqlSession = null;

									    EmpMapper mapper =null;

									   @Before

									   public void test1(){

									       //首先做一个对象SqlSessionFactoryBuilder建立一个绘话

									       SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();

									       //有一个文本输入的io流进行读取操作

									       InputStream stream = null;

									       try {

									           //这里的路径直接会定位到配置文件classes下面；所以这个文件在次目录下--编译和

									           //-图纸；对数据库文件进行读取，获取一个io流，由于配置文件在classes下面，直接写文件名即可

									           stream = Resources.getResourceAsStream("sqlMapConfig.xml");

									       } catch (IOException e) {

									           e.printStackTrace();

									       }

									       //build需要指向一个文件进行读取出来--工厂

									       SqlSessionFactory factory = ssfb.build(stream);

									        //需要用sqlSession去调用增删改查--工人去获取数据，打开这个绘话

									       sqlSession = factory.openSession(true);

									   }

									    @Test

									    public void test4(){

									        EmpTestMapper mapper = sqlSession.getMapper(EmpTestMapper.class);

									        Dept emp = mapper.findByDeptno(20);

									        Dept dept = new Dept();

									        dept.setDeptno(null);

									        dept.setLoc("大格");

									        dept.setDname("水军");

									        int addDept = mapper.addDept(dept);

									        System.out.println(addDept);

									        System.out.println(emp);

									    }

									    @After

									    public void test3(){

									       if (sqlSession!=null){

									           sqlSession.close();

									       }

									    }

									}