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Mybatis逆向生成使用扩展类的实例代码详解

2019-05-27 11:36 453 查看

1.背景介绍

用的mybatis自动生成的插件，然而每次更改数据库的时候重新生成需要替换原有的mapper.xml文件，都要把之前业务相关的sql重新写一遍，感觉十分麻烦，就想着把自动生成的作为一个基础文件，然后业务相关的写在扩展文件里面，这样更改数据库后只需要把所有基础文件替换掉就可以了

2.代码

2.1 BaseMapper.java

把自动生成的方法都抽到一个base类，然后可以写一些公共的方法

/**
* @author 吕梁山
* @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

自动生成的mapper文件，里面基本都是空的了

public interface UserMapper extends BaseMapper<User> { }

2.3 ExtUserMapper.java

mapper的扩展类，业务相关的

/**
* @author 吕梁山
* @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

自动生成的mapper.xml文件，没有改动，不同的生成器生成的可能不同

注意namespace要写正确

<?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

业务相关的sql,这里用不了自动生成mapper.xml里面的BaseResultMap这些东西

<?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层调用的时候直接调用扩展的mapper

/**
* @author 吕梁山
* @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不在同一个目录，需要在application.yml将所有mapper.xml文件都添加到扫描中

mybatis:
#扫描sql.xml文件
mapper-locations: classpath:mapping/**/*.xml
#自动扫描实体类
type-aliases-package: com.pikaqiu.barber.entity

至此，每次更改数据库结构后，直接重新生成文件对base文件进行替换即可，不需要再去将业务代码复制重新粘贴

总结

以上所述是小编给大家介绍的Mybatis逆向生成使用扩展类的实例代码详解,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！

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