package com.mybatis.dao;

import com.mybatis.bean.Employee;

public interface EmployeeMapper {

    public void addEmp(Employee employee);

}

<?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.mybatis.dao.EmployeeMapper">

    <!-- parameterType：参数类型，可以省略，

	获取自增主键的值：

		mysql支持自增主键，自增主键值的获取，mybatis也是利用statement.getGenreatedKeys()；

		useGeneratedKeys="true"；使用自增主键获取主键值策略

		keyProperty；指定对应的主键属性，也就是mybatis获取到主键值以后，将这个值封装给javaBean的哪个属性

	-->

    <insert id="addEmp" parameterType="com.mybatis.bean.Employee" useGeneratedKeys="true" keyProperty="id">

        insert into tbl_employee(last_name, gender, email)

        values (#{lastName},#{gender},#{email})

    </insert>

</mapper>

package com.mybatis.demo;

import java.io.IOException;

import java.io.InputStream;

import com.mybatis.bean.Employee;

import com.mybatis.dao.EmployeeMapper;

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;

public class MyTest {

    public SqlSessionFactory getSqlSessionFactory() throws IOException {

        String resource = "mybatis-config.xml";

        InputStream inputStream = Resources.getResourceAsStream(resource);

        return new SqlSessionFactoryBuilder().build(inputStream);

    }

    @Test

    public void testAdd() throws IOException {

        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();

        SqlSession openSession = sqlSessionFactory.openSession(true);

        try {

            EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);

            Employee employee = new Employee("jetty", "jetty@126.com", 1);

            mapper.addEmp(employee);

            System.out.println(employee.getId());

        } finally {

            openSession.close();

        }

    }

}