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這篇文章給大家分享的是有關Mybatis如何逆向生成使用擴展類的內容。小編覺得挺實用的，因此分享給大家做個參考，一起跟隨小編過來看看吧。
1.背景介紹
用的mybatis自動生成的插件，然而每次更改數據庫的時候重新生成需要替換原有的mapper.xml文件，都要把之前業務相關的sql重新寫一遍，感覺十分麻煩，就想著把自動生成的作為一個基礎文件，然后業務相關的寫在擴展文件里面，這樣更改數據庫后只需要把所有基礎文件替換掉就可以了
2.代碼
2.1 BaseMapper.java
把自動生成的方法都抽到一個base類，然后可以寫一些公共的方法
/**
* @author 呂梁山
* @date 2019/4/23
*/
public interface BaseMapper<T> {
int deleteByPrimaryKey(Integer id);
int insert(T entity);
int insertSelective(T entity);
int updateByPrimaryKeySelective(T entity);
int updateByPrimaryKey(T entity);
T selectByPrimaryKey(Integer id);
}2.2 UserMapper.java
自動生成的mapper文件，里面基本都是空的了
public interface UserMapper extends BaseMapper<User> { }2.3 ExtUserMapper.java
mapper的擴展類，業務相關的
/**
* @author 呂梁山
* @date 2019/4/25
*/
public interface ExtUserMapper extends UserMapper {
ExtUser selectUserByOpenId(String openId);
int existUserByOpenId(String openId);
int updateByOpenId(User user);
}2.4 UserMapper.xml
自動生成的mapper.xml文件，沒有改動，不同的生成器生成的可能不同
注意namespace要寫正確
<?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.pikaqiu.barber.dao.base.UserMapper">
<resultMap id="BaseResultMap" type="com.pikaqiu.barber.entity.base.User">
<id column="id" property="id" jdbcType="INTEGER"/>
<result column="user_name" property="userName" jdbcType="VARCHAR"/>
<result column="user_img" property="userImg" jdbcType="VARCHAR"/>
<result column="open_id" property="openId" jdbcType="VARCHAR"/>
<result column="phone" property="phone" jdbcType="VARCHAR"/>
<result column="sex" property="sex" jdbcType="INTEGER"/>
<result column="province" property="province" jdbcType="VARCHAR"/>
<result column="country" property="country" jdbcType="VARCHAR"/>
<result column="city" property="city" jdbcType="VARCHAR"/>
<result column="birth_date" property="birthDate" jdbcType="VARCHAR"/>
<result column="subscribe_date" property="subscribeDate" jdbcType="TIMESTAMP"/>
<result column="subscribe_scene" property="subscribeScene" jdbcType="VARCHAR"/>
<result column="create_date" property="createDate" jdbcType="TIMESTAMP"/>
</resultMap>
<sql id="Base_Column_List">
id, user_name, user_img, open_id, phone, sex, province, country, city, birth_date,
subscribe_date, subscribe_scene, create_date
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">
select
<include refid="Base_Column_List"/>
from t_user
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from t_user
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.pikaqiu.barber.entity.base.User">
insert into t_user (id, user_name, user_img,
open_id, phone, sex,
province, country, city,
birth_date, subscribe_date, subscribe_scene,
create_date)
values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{userImg,jdbcType=VARCHAR},
#{openId,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR}, #{sex,jdbcType=INTEGER},
#{province,jdbcType=VARCHAR}, #{country,jdbcType=VARCHAR},
#{city,jdbcType=VARCHAR},
#{birthDate,jdbcType=VARCHAR}, #{subscribeDate,jdbcType=TIMESTAMP},
#{subscribeScene,jdbcType=VARCHAR},
#{createDate,jdbcType=TIMESTAMP})
</insert>
<insert id="insertSelective" parameterType="com.pikaqiu.barber.entity.base.User">
insert into t_user
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="id != null">
id,
</if>
<if test="userName != null">
user_name,
</if>
<if test="userImg != null">
user_img,
</if>
<if test="openId != null">
open_id,
</if>
<if test="phone != null">
phone,
</if>
<if test="sex != null">
sex,
</if>
<if test="province != null">
province,
</if>
<if test="country != null">
country,
</if>
<if test="city != null">
city,
</if>
<if test="birthDate != null">
birth_date,
</if>
<if test="subscribeDate != null">
subscribe_date,
</if>
<if test="subscribeScene != null">
subscribe_scene,
</if>
<if test="createDate != null">
create_date,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
<if test="id != null">
#{id,jdbcType=INTEGER},
</if>
<if test="userName != null">
#{userName,jdbcType=VARCHAR},
</if>
<if test="userImg != null">
#{userImg,jdbcType=VARCHAR},
</if>
<if test="openId != null">
#{openId,jdbcType=VARCHAR},
</if>
<if test="phone != null">
#{phone,jdbcType=VARCHAR},
</if>
<if test="sex != null">
#{sex,jdbcType=INTEGER},
</if>
<if test="province != null">
#{province,jdbcType=VARCHAR},
</if>
<if test="country != null">
#{country,jdbcType=VARCHAR},
</if>
<if test="city != null">
#{city,jdbcType=VARCHAR},
</if>
<if test="birthDate != null">
#{birthDate,jdbcType=VARCHAR},
</if>
<if test="subscribeDate != null">
#{subscribeDate,jdbcType=TIMESTAMP},
</if>
<if test="subscribeScene != null">
#{subscribeScene,jdbcType=VARCHAR},
</if>
<if test="createDate != null">
#{createDate,jdbcType=TIMESTAMP},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.pikaqiu.barber.entity.base.User">
update t_user
<set>
<if test="userName != null">
user_name = #{userName,jdbcType=VARCHAR},
</if>
<if test="userImg != null">
user_img = #{userImg,jdbcType=VARCHAR},
</if>
<if test="openId != null">
open_id = #{openId,jdbcType=VARCHAR},
</if>
<if test="phone != null">
phone = #{phone,jdbcType=VARCHAR},
</if>
<if test="sex != null">
sex = #{sex,jdbcType=INTEGER},
</if>
<if test="province != null">
province = #{province,jdbcType=VARCHAR},
</if>
<if test="country != null">
country = #{country,jdbcType=VARCHAR},
</if>
<if test="city != null">
city = #{city,jdbcType=VARCHAR},
</if>
<if test="birthDate != null">
birth_date = #{birthDate,jdbcType=VARCHAR},
</if>
<if test="subscribeDate != null">
subscribe_date = #{subscribeDate,jdbcType=TIMESTAMP},
</if>
<if test="subscribeScene != null">
subscribe_scene = #{subscribeScene,jdbcType=VARCHAR},
</if>
<if test="createDate != null">
create_date = #{createDate,jdbcType=TIMESTAMP},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.pikaqiu.barber.entity.base.User">
update t_user
set user_name = #{userName,jdbcType=VARCHAR},
user_img = #{userImg,jdbcType=VARCHAR},
open_id = #{openId,jdbcType=VARCHAR},
phone = #{phone,jdbcType=VARCHAR},
sex = #{sex,jdbcType=INTEGER},
province = #{province,jdbcType=VARCHAR},
country = #{country,jdbcType=VARCHAR},
city = #{city,jdbcType=VARCHAR},
birth_date = #{birthDate,jdbcType=VARCHAR},
subscribe_date = #{subscribeDate,jdbcType=TIMESTAMP},
subscribe_scene = #{subscribeScene,jdbcType=VARCHAR},
create_date = #{createDate,jdbcType=TIMESTAMP}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>2.5 ExtUserMapper.xml
業務相關的sql,這里用不了自動生成mapper.xml里面的BaseResultMap這些東西
<?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.pikaqiu.barber.dao.ExtUserMapper">
<resultMap id="BaseResultMap" type="com.pikaqiu.barber.entity.ExtUser">
<id column="id" property="id" jdbcType="INTEGER"/>
<result column="user_name" property="userName" jdbcType="VARCHAR"/>
<result column="user_img" property="userImg" jdbcType="VARCHAR"/>
<result column="open_id" property="openId" jdbcType="VARCHAR"/>
<result column="phone" property="phone" jdbcType="VARCHAR"/>
<result column="sex" property="sex" jdbcType="INTEGER"/>
<result column="province" property="province" jdbcType="VARCHAR"/>
<result column="country" property="country" jdbcType="VARCHAR"/>
<result column="city" property="city" jdbcType="VARCHAR"/>
<result column="birth_date" property="birthDate" jdbcType="VARCHAR"/>
<result column="subscribe_date" property="subscribeDate" jdbcType="TIMESTAMP"/>
<result column="subscribe_scene" property="subscribeScene" jdbcType="VARCHAR"/>
<result column="create_date" property="createDate" jdbcType="TIMESTAMP"/>
</resultMap>
<update id="updateByOpenId" parameterType="com.pikaqiu.barber.entity.base.User" >
update t_user
<set>
<if test="userName != null">
user_name = #{userName,jdbcType=VARCHAR},
</if>
<if test="userImg != null">
user_img = #{userImg,jdbcType=VARCHAR},
</if>
<if test="phone != null">
phone = #{phone,jdbcType=VARCHAR},
</if>
<if test="sex != null">
sex = #{sex,jdbcType=INTEGER},
</if>
<if test="province != null">
province = #{province,jdbcType=VARCHAR},
</if>
<if test="country != null">
country = #{country,jdbcType=VARCHAR},
</if>
<if test="city != null">
city = #{city,jdbcType=VARCHAR},
</if>
<if test="birthDate != null">
birth_date = #{birthDate,jdbcType=VARCHAR},
</if>
<if test="subscribeDate != null">
subscribe_date = #{subscribeDate,jdbcType=TIMESTAMP},
</if>
<if test="subscribeScene != null">
subscribe_scene = #{subscribeScene,jdbcType=VARCHAR},
</if>
<if test="createDate != null">
create_date = #{createDate,jdbcType=TIMESTAMP},
</if>
</set>
where open_id = #{openId,jdbcType=INTEGER}
</update>
<select id="selectUserByOpenId" parameterType="String" resultMap="BaseResultMap">
select *
from t_user
where open_id = #{openId,jdbcType=VARCHAR}
</select>
<select id="existUserByOpenId" parameterType="String" resultType="Integer">
select count(0)
from t_user
where open_id = #{openId,jdbcType=VARCHAR}
</select>
</mapper>2.6 UserServiceImpl.java
service層調用的時候直接調用擴展的mapper
/**
* @author 呂梁山
* @date 2019/4/23
*/
@Service("userService")
public class UserServiceImpl implements UserService {
@Resource
private ExtUserMapper extUserMapper;
@Override
public ExtUser getUserByOpenId(String openId) {
return extUserMapper.selectUserByOpenId(openId);
}
}注：如果生成的mapper.xml和extmapper.xml不在同一個目錄，需要在application.yml將所有mapper.xml文件都添加到掃描中
mybatis: #掃描sql.xml文件 mapper-locations: classpath:mapping/**/*.xml #自動掃描實體類 type-aliases-package: com.pikaqiu.barber.entity
至此，每次更改數據庫結構后，直接重新生成文件對base文件進行替換即可，不需要再去將業務代碼復制重新粘貼
感謝各位的閱讀！關于“Mybatis如何逆向生成使用擴展類”這篇文章就分享到這里了，希望以上內容可以對大家有一定的幫助，讓大家可以學到更多知識，如果覺得文章不錯，可以把它分享出去讓更多的人看到吧！
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