关于insert返回值

package com.imooc.mybatis;


import com.imooc.dto.GoodsDTO;
import com.imooc.entity.Goods;
import com.imooc.entity.Student;
import com.imooc.mybatis.utils.MyBatisUtils;
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 javax.xml.ws.RequestWrapper;
import java.io.IOException;
import java.io.Reader;
import java.sql.Connection;
import java.util.*;

public class MyBatisTestor {
    private Object Goods;

    @Test
    public void testSqlSessionFactory() throws IOException {
        //利用Reader加载classpath下的mybatis-config.xml核心配置文件
        Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
        //初始化SqlSessionFactory对象,同时解析mybatis-config.xml文件
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        System.out.println("SessionFactory加载成功");

    }

    @Test
    public void testMyBatisUtils(){
        SqlSession sqlSession = null;
        try{
        sqlSession=MyBatisUtils.openSession();
        Connection connection=sqlSession.getConnection();
        System.out.println(connection);

        }catch(Exception e){
            e.printStackTrace();
        }finally{
            MyBatisUtils.closeSession(sqlSession);
        }
    }
    @Test
    public void testSelectAll(){
        SqlSession session=null;
        try{
            session=MyBatisUtils.openSession();
            List<Goods> list=session.selectList("goods.selectAll");
            for (Goods g:list
            ) {
                System.out.println(g);
            }

        }catch(Exception e){
            e.printStackTrace();
        }finally{
            MyBatisUtils.closeSession(session);
        }

    }

    @Test
    public void testSelectAllStudent(){
        SqlSession session=null;
        try{
            session=MyBatisUtils.openSession();
            List<Student> list=session.selectList("student.selectAll");
            for (Student s:list
            ) {
                System.out.println(s);
            }

        }catch(Exception e){
            e.printStackTrace();
        }finally{
            MyBatisUtils.closeSession(session);
        }

    }

    @Test
   public void testSelectById(){
        SqlSession session=null;
        try{

            session = MyBatisUtils.openSession();
            Goods = session.selectOne("goods.selectById", 1602);
            System.out.println(Goods);
        }catch(
                Exception e){
            e.printStackTrace();
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void selectGoodsMap(){
        SqlSession session=null;
        try{

            session = MyBatisUtils.openSession();
            List<Map> list = session.selectList("goods.selectGoodsMap");
            for (Map map : list
            ) {
                System.out.println(map);
            }
//            System.out.println(Goods);
        }catch(Exception e){
            e.printStackTrace();
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void selectGoodsDTO(){
        SqlSession session=null;
        try{

            session = MyBatisUtils.openSession();
            List<GoodsDTO> list = session.selectList("goods.selectGoodsDTO");
            for (GoodsDTO g : list
            ) {
                 System.out.println(g);
            }
//            System.out.println(Goods);
        }catch(Exception e){
            e.printStackTrace();
        }finally {

            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void insert(){
        SqlSession session=null;
        try{

            session = MyBatisUtils.openSession();
            Goods goods = new Goods();
            goods.setTitle("test");
            goods.setSubTitle("test123");
            goods.setOriginalCost(200f);
            goods.setCurrentPrice(100f);
            goods.setDiscount(0.5f);
            goods.setIsFreeDelivery(1);
            goods.setCategoryId(43);
            int num=session.insert("goods.insert",goods);
            System.out.println(num);
            System.out.println(goods.getGoodsId());
            session.commit();

        }catch(Exception e){
            e.printStackTrace();
            if(session!=null){
                session.rollback();
            }
        }finally {

            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void insertStudent(){
        SqlSession session = null;
        try {

            session=MyBatisUtils.openSession();
            Student student = new Student();
            student.setName("楠楠");
            student.setRegNo(20171208);
            student.setAge(26);
            student.setGrade("2013");
            student.setMajor("哲学系");
            student.setSex("男");
            int num = session.insert("goods.insertstudent", student);
            System.out.println(num);
           session.commit();
            
        } catch (Exception e) {
            e.printStackTrace();
            if (session != null) {
                session.rollback();
            }
        }finally {
            session.close();
        }
    }
}

int num = session.insert("goods.insertstudent", student);

我想问一下怎么判断除了在数据表里面查看，还有什么方法可以知道是否插入成功，上面这个方法的返回值1可以证明插入成功吗，如果可以的话，不是要运行session.commit()才提交吗？