03、mybatis插入数据，返回自增ID

注意：实现这此功能前，你需要会mybatis环境搭建！！

1. 创建User类

/**
 * @author boat
 */
public class User implements Serializable{

    private Integer id;
    private String username;
    private Date birthday;
    private String sex;
    private String address;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username=‘" + username + ‘\‘‘ +
                ", birthday=" + birthday +
                ", sex=‘" + sex + ‘\‘‘ +
                ", address=‘" + address + ‘\‘‘ +
                ‘}‘;
    }
}

2. 创建dao接口

/**
 * @author boat
 */
public interface IUserDao {

    /**
     * 保存
     * @param user
     * @return
     */
    Integer addUser(User user);

}

3. 创建IUserDao.xml文件

<?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.boat.dao.IUserDao">

    <!--
        order="AFTER" 添加之后操作
        keyProperty="id" 对象id
        keyColumn="id" 数据记录id
        resultType="Integer" 返回的类型
        
        select last_insert_id(); 查询自增id，这属于mysql函数
        
    -->
    <insert id="addUser" parameterType="com.boat.pojo.User">
        <selectKey order="AFTER" keyProperty="id" keyColumn="id" resultType="Integer">
            select last_insert_id();
        </selectKey>
        insert into user(username,birthday,sex,address)
        values(#{username},#{birthday},#{sex},#{address});
    </insert>
</mapper>

4. 编写测试类

/**
 * @author boat
 */
public class MybatisTest {

    @Test
    public void testInsert() throws IOException {
        //1.读取配置文件
        InputStream in = Resources.getResourceAsStream("mybatis.xml");
        //2.创建SqlSessionFactory工厂
        SqlSessionFactoryBuilder factory = new SqlSessionFactoryBuilder();
        //3.使用工厂生产SqlSession对象
        SqlSessionFactory build = factory.build(in);
        
        //4.使用SqlSession创建Dao接口的代理对象
        SqlSession sqlSession = build.openSession();
        
        IUserDao mapper = sqlSession.getMapper(IUserDao.class);

        User user = new User();
        user.setUsername("boat");
        user.setBirthday(new Date());
        user.setSex("男");
        user.setAddress("北京");

        Integer integer = mapper.addUser(user);

        sqlSession.commit();

        if(integer > 0){
            System.out.println("保存成功");
        }

        System.out.println(user);

        //关闭资源
        sqlSession.close();
        in.close();
    }

}

03、mybatis插入数据，返回自增ID

原文：https://www.cnblogs.com/M87-A/p/14769345.html