如果想封装一个业务组件给其他项目使用,mapper和Controller和service需要是开箱即用的。可以使用start机制将这些组件注册到spring的容器里,传统方式是@MapperScan扫描到mapper路径,但作为一个业务组件来说越少的配置越好,本文探索一种开箱即用的方式来注册mapper
BeanPostProcessor
拦截SqlSessionFactory
注册mapper类似于import com.baomidou.mybatisplus.core.MybatisConfiguration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
/**
* @author wxl 使用SqlSessionFactory 注册mapper
*/
public class SqlSessionFactoryPostProcessor implements BeanPostProcessor {
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof SqlSessionFactory sessionFactory) {
MybatisConfiguration configuration = (MybatisConfiguration) sessionFactory.getConfiguration();
if (!configuration.hasMapper(LogRecordMapper.class)) {
configuration.addMapper(LogRecordMapper.class);
}
}
return BeanPostProcessor.super.postProcessAfterInitialization(bean, beanName);
}
}
@Bean
public SqlSessionFactoryPostProcessor sqlSessionFactoryPost() {
return new SqlSessionFactoryPostProcessor();
}
@Bean
public LogRecordMapper logRecordMapper(SqlSessionTemplate sqlSessionTemplate) {
return sqlSessionTemplate.getMapper(LogRecordMapper.class);
}