(re)scanning Mybatis mappers from the filesystem

Question

The Mybatis (3.2) manual describes three ways to configure Mappers as follows: http://mybatis.github.io/spring/mappers.html

Is there any way to extend any of these three procedures so that:

1. Mapper XML files can be read from outside the classpath (i.e. from a filesystem location)
2. Mapper XML files can be 'rescanned' for changes that have been made to defined queries since the Application started

Thank you for any advice

Answer 1

It looks like (1) can be achieved along the lines of:

 @Bean   
    public SqlSessionFactory sqlSessionFactory() throws Exception 
    {     
        SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setMapperLocations(new Resource[]{resource1, resource2});
        sessionFactory.setDataSource(getDataSource());    
        return sessionFactory.getObject();   
    } 

In terms of (2), it seems like this is a much-wanted but unavailable feature in Mybatis. One work-around however is to completely re-create the SqlSession and replace the old one - this effectively picks up any changes made to XML Mappers.

 SqlSession sqlSession = applicationConfiguration.createSqlSessionFactory().openSession();
 sqlSession.selectList(...)

Hope this helps someone.