1、 Mybatisplus only configures mapper in YML, and the path scanning is not enough

mapper-locations: classpath:com/jack/shale_porosity/mapper/xml/*.xml

In this way, only the basemapper provided by mybatis can be used. The mapper file is not loaded in the target file.

2、 Configure the mapper file scanning path again in the pom.xml file

 <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>

In this way, you can successfully use custom SQL and SQL in basemapper.