IDEA mapper 报错：Invalid bound statement (not found)

抛开mybatis bing 问题不谈，很有可能是

target 路径下mapper.xml未编译。解决：在pom.xml添加

<resources>
            <!-- maven项目中src源代码下的xml等资源文件编译进classes文件夹，
              注意：如果没有这个，它会自动搜索resources下是否有mapper.xml文件，
              如果没有就会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.pet.mapper.PetMapper.selectByPrimaryKey-->
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>

            <!--将resources目录下的配置文件编译进classes文件  -->
            <resource>
                <directory>src/main/resources</directory>
            </resource>

        </resources>

然后搞定！