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一开始从网上找的generatorConfig.xml内容如下：

<!-- 配置生成器 -->
<generatorConfiguration>
    <!--执行generator插件生成文件的命令： call mvn mybatis-generator:generate -e -->
    <!-- 引入配置文件 -->
    <properties resource="mybatis-generator/mybatisGeneratorInit.properties"/>
<span class="token comment">&lt;!-- 一个数据库一个context --&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>context</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>MysqlTables<span class="token punctuation">"</span></span> <span class="token attr-name">targetRuntime</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>MyBatis3Simple<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token comment">&lt;!-- 自动识别数据库关键字，默认false，如果设置为true，根据SqlReservedWords中定义的关键字列表；
    一般保留默认值，遇到数据库关键字（Java关键字），使用columnOverride覆盖 --&gt;</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>autoDelimitKeywords<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>true<span class="token punctuation">"</span></span> <span class="token punctuation">/&gt;</span></span>
    <span class="token comment">&lt;!-- 生成的Java文件的编码 --&gt;</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>javaFileEncoding<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span> <span class="token punctuation">/&gt;</span></span>
    <span class="token comment">&lt;!-- beginningDelimiter和endingDelimiter：指明数据库的用于标记数据库对象名的符号，比如ORACLE就是双引号，MYSQL默认是`反引号； --&gt;</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>beginningDelimiter<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>`<span class="token punctuation">"</span></span> <span class="token punctuation">/&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>property</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>endingDelimiter<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>`<span class="token punctuation">"</span></span> <span class="token punctuation">/&gt;</span></span>
...
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>context</span><span class="token punctuation">&gt;</span></span>
...

</generatorConfiguration>

   
   

发现运行生成代码的maven插件后，Mapper.java和Mapper.xml中都没有Selective结尾的方法(insertSelective、updateByPrimaryKeySelective)。

后来发现是context标签的targetRuntime属性的原因，将其设置为MyBatis3即可。

更详细的Mybatis-generator插件配置请参考：
1.https://www.jianshu.com/p/e09d2370b796
2.https://github.com/zouzg/mybatis-generator-gui

原文地址:https://blog.csdn.net/lzufeng/article/details/86716095