关于mybatis-plus 和 mybatis-plus-boot-starter 异同点分析

超、凢脫俗 2022-01-28 06:47 1247阅读 0赞

在采用mybatis-plus做代码生成器时，我前面的文章[https://blog.csdn.net/u012329294/article/details/90473681][https_blog.csdn.net_u012329294_article_details_90473681] 讲过，必须把其他的mybatis-plus删掉，只留下mybatis-plus-boot-starter。

但用mybatis-plus-boot-starter生成的代码，放在mybatis-plus依赖环境中，

<dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus</artifactId>
        <version>2.0.6</version>
    </dependency>

总是报错

Whitelabel Error Page
    This application has no explicit mapping for /error, so you are seeing this as a fallback.
    
    Thu May 23 14:54:08 CST 2019
    There was an unexpected error (type=Internal Server Error, status=500).
    Invalid bound statement (not found): com.mrk.dx.system.dao.SkyUserDao.selectList
    org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.mrk.dx.system.dao.SkyUserDao.selectList
    	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:232)
    	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:50)
    	at org.apache.ibatis.binding.MapperProxy.lambda$cachedMapperMethod$0(MapperProxy.java:62)
    	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
    	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:62)
    	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:57)
    	at com.sun.proxy.$Proxy101.selectList(Unknown Source)
    	at com.baomidou.mybatisplus.service.impl.ServiceImpl.selectList(ServiceImpl.java:292)
    	at com.baomidou.mybatisplus.service.impl.ServiceImpl$$FastClassBySpringCGLIB$$3e2398a4.invoke(<generated>)
    	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
    	at com.mrk.dx.system.service.impl.SkyUserServiceImpl$$EnhancerBySpringCGLIB$$d0192f7b.selectList(<generated>)

这个报错很有迷惑性，反复查找名字映射等都不行。

后来经过提醒才发觉，原来mybatis-plus并没有自动生成那些命令。

即其中的selectList方法要自己来实现。

<?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.mrk.dx.system.dao.SkyUserDao">
    
        
        <resultMap id="BaseResultMap" type="com.mrk.dx.system.entity.SkyUser">
            <id column="id" property="id" />
            <result column="name" property="name" />
            <result column="nickname" property="nickname" />
            <result column="sex" property="sex" />
            <result column="phone" property="phone" />
            <result column="identifier" property="identifier" />
            <result column="openid" property="openid" />
            <result column="created_at" property="createdAt" />
            <result column="updated_at" property="updatedAt" />
            <result column="headimgurl" property="headimgurl" />
            <result column="root_organization_ids" property="rootOrganizationIds" />
        </resultMap>
    
        <select id="selectList" resultMap="BaseResultMap"> select * from sky_user </select>
    
    </mapper>
    
    如上图，加上红色那一句后就可以了，这个耽误了将近1天时间。

而在mybatis-plus-boot-starter中不需要写，它已经完全自动实现了。

**因此，mybatis-plus 和 mybatis-plus-boot-starter 的主要异同点就在于：**

**mybatis-plus-boot-starter将xml中basemap中定义的id全部已经实现了，**

**而mybatis-plus这个包还需要自己实现basemap中的定义。**

[https_blog.csdn.net_u012329294_article_details_90473681]: https://blog.csdn.net/u012329294/article/details/90473681