[SpringBoot+MyBatis] Invalid bound statement (not found) error in the project

1. Note: My mapper.xml is in the static resources resources folder.

2. Reason for error reporting:

1. The location of the Mapper.xml file is not configured correctly in the MyBatis configuration file or the wrong location is configured (My own problem)

Solution: Add mapper-locations in application.yml.

mybatis:
  mapper-locations: classpath:mapper/*.xml

This code is a tag in the MyBatis configuration file, used to specify the location of the Mapper XML file. Among them, mapper-locations is the attribute name, and classpath:mapper/*.xml is the attribute value.

Hereclasspath: means to start searching from the class path, and mapper/*.xml means to search for all the suffix .xml in the mapper directory under the class path. file and use it as a Mapper XML file. Normally, Mapper XML files are placed in a separate directory for management and maintenance.

2. The namespace in mapper.xml is inconsistent with the actual mapper file.

Solution: Right-click UserMapper ——》Copy Path/Prference ——》Copy Prference to copy the namespace path.

 3. The method name in the mapper interface is inconsistent with the id tag in mapper.xml

Solution: Check whether the id tag and method name are the same.

 4. Mapper.xml is not built.

Solution: Check in the target directory to see if the corresponding Mapper.xml file is there. If it is not there, click maven on the right, clean it, and run it again.