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Mybatis的sql注释
//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();
}
}
}
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