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解决mybatis generator无法覆盖XML

今天发现 mybatis generator maven plugin 在重复生成的时候 xml 文件只会 merge，不会覆盖。

明明在 pom.xml 中配置了如下：

<configuration>
    <configurationFile>src/main/resources/mybatis/generatorConfig.xml</configurationFile>
    <verbose>true</verbose>
    <overwrite>true</overwrite>
</configuration>

去github上查找与 overwrite 相关的 issue，找到了这个提交。

上面的意思是：当你取消了所有注释，你在重复运行 generator 时在 mapper.xml 中会出现重复的元素。并且这个 plugin 可以解决这个问题，版本是 1.3.7

去查看 generatorConfiguration，确实配置了取消生成注释。

<!-- 配置生成器 -->
<generatorConfiguration>

&lt;properties resource=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mybatis/jdbc.properties</span><span style="color: rgba(128, 0, 0, 1)">"</span>/&gt;

&lt;context id=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">MyBatis</span><span style="color: rgba(128, 0, 0, 1)">"</span> targetRuntime=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">MyBatis3</span><span style="color: rgba(128, 0, 0, 1)">"</span>  defaultModelType=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">flat</span><span style="color: rgba(128, 0, 0, 1)">"</span>&gt;

    &lt;!-- 不生成注释 --&gt;
    &lt;commentGenerator&gt;
        &lt;property name=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">suppressAllComments</span><span style="color: rgba(128, 0, 0, 1)">"</span> value=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">true</span><span style="color: rgba(128, 0, 0, 1)">"</span>/&gt;
    &lt;/commentGenerator&gt;<span style="color: rgba(0, 0, 0, 1)">
    
... ...



<generatorConfiguration>

那怎么既想取消注释又想覆盖 XML 文件生成呢？答案就是上面说的使用UnmergeableXmlMappersPlugin

在 <context> 下增加一个 <plugin>

<!-- 配置生成器 -->
<generatorConfiguration>

&lt;properties resource=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">mybatis/jdbc.properties</span><span style="color: rgba(128, 0, 0, 1)">"</span>/&gt;

&lt;context id=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">MyBatis</span><span style="color: rgba(128, 0, 0, 1)">"</span> targetRuntime=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">MyBatis3</span><span style="color: rgba(128, 0, 0, 1)">"</span>  defaultModelType=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">flat</span><span style="color: rgba(128, 0, 0, 1)">"</span>&gt;

    &lt;!--覆盖生成XML文件--&gt;
    &lt;plugin type=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">org.mybatis.generator.plugins.UnmergeableXmlMappersPlugin</span><span style="color: rgba(128, 0, 0, 1)">"</span> /&gt;
    
    &lt;!-- 不生成注释 --&gt;
    &lt;commentGenerator&gt;
        &lt;property name=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">suppressAllComments</span><span style="color: rgba(128, 0, 0, 1)">"</span> value=<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">true</span><span style="color: rgba(128, 0, 0, 1)">"</span>/&gt;
    &lt;/commentGenerator&gt;<span style="color: rgba(0, 0, 0, 1)">

... ...



<generatorConfiguration>

 

GitHub 地址：https://github.com/syoukaihou/sbsm