DAO接口：

package com.sunxl.dao;import com.sunxl.pojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.SelectKey;
import org.apache.ibatis.annotations.Update;import java.util.List;public interface UserDao {@Select("select * from users")List findAll();@Insert("insert into users (name,age) values(#{name},#{age})")@SelectKey(statement = "select last_insert_id()", keyProperty = "id", keyColumn = "id", resultType = int.class ,before = false)int saveUser(User user);@Update("update users set name = #{name},age = #{age} where id = #{id}")int updateUser(User user);
//
//    int deleteUser(Integer id);
//
//    User findById(Integer id);
//
//    List findByName(String name);
//
//    int findTotal();
//
//    int saveInsertUser(User user);}

测试执行：

import com.sunxl.dao.UserDao;
import com.sunxl.pojo.User;
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.IOException;
import java.io.InputStream;
import java.util.List;public class MybatisTest {public static void main(String[] args) throws IOException {//        InputStream config = Resources.getResourceAsStream("mybatis-config.xml");
//
//        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
//        SqlSessionFactory factory = builder.build(config);
//        SqlSession ss = factory.openSession();
//        UserDao userdao = ss.getMapper(UserDao.class);
//
//
//        List users = userdao.findAll();
//
//        for (User user: users){
//            System.out.println(user);
//        }
//
//
//        ss.commit();
//        ss.close();
//        config.close();InputStream config = Resources.getResourceAsStream("mybatis-config.xml");SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();SqlSessionFactory factory = builder.build(config);SqlSession ss = factory.openSession();UserDao userdao = ss.getMapper(UserDao.class);User as = new User();as.setName("mei_guo");as.setAge(1005);as.setId(1005);int a = userdao.updateUser(as);System.out.println(a);System.out.println(as.toString());ss.commit();ss.close();config.close();}
}