解决 MyBatis 'Invalid bound statement (not found)' 错误

The exception 'Invalid bound statement (not found): com.haiwei.mapper.EmpMapper.list' is thrown by the MyBatis framework.

This exception occurs when MyBatis cannot find a mapped statement with the specified ID in the XML mapper file. In this case, the exception is thrown when trying to execute the 'list' method in the 'EmpMapper' class.

To resolve this issue, you need to check the following:

1. Ensure that the XML mapper file (e.g., 'EmpMapper.xml') exists in the correct location and is properly configured. It should contain a mapped statement with the ID 'list'.

2. Verify that the namespace declared in the XML mapper file matches the package and class name of the 'EmpMapper' interface. For example, if the interface is in the package 'com.haiwei.mapper', the namespace in the XML file should be 'com.haiwei.mapper.EmpMapper'.

3. Ensure that the method name in the interface ('EmpMapper') matches the ID of the mapped statement in the XML mapper file. For example, if the method in the interface is named 'list', the ID in the XML file should be 'list'.

4. Check if the XML mapper file is properly configured in the MyBatis configuration file (e.g., 'mybatis-config.xml'). Make sure the mapper file is included and referenced correctly.

By addressing these points, you should be able to resolve the 'Invalid bound statement (not found)' exception in your application.