Guns framework multi data source configuration without modifying the configuration file

Project requirements , Configure multiple data sources , I also found a lot on the Internet , But there are many configuration items , and Guns It comes with multiple data source facets AOP, Didn't use it . I interrupted and looked at the configuration , Found a solution ：

1. stay database_info Insert information about the new data source into the table
   
2. Annotate the methods that need to switch data sources @DataSource(name = “dataSourceBiz”)

@Override
@DataSource(name = "dataSourceBiz")
public List<SysAlarm> getAll() {
    
System.out.println(DataSourceContextHolder.getDataSourceType());
    return this.baseMapper.selectList(null);
}

name The value of is written in the database db_name field value

3. result
   Query results of the master data source ：
   
   Query results of the second data source ：
   
   The output is DataSourceContextHolder.getDataSourceType(), That's the data source

Guns The framework has written the switching of multiple data sources , So we don't have to write our own configuration , The configuration of the framework itself is as follows ：

1. DataSourceConfig class

The project will start with DataSourceConfig Class , Configure the master data source , Namely application-local.yml or dev.yml Database configured in ,prefix The mapping is yml Inside spring.datasource

then , Create a master database instance

After a series of database operations , Will enter the following ：

The corresponding is MultiSourceExAop class

2. SqlSessionFactoryConfig class

Then go into this class , Create the primary database sqlsessionfactory

Initialize the master data source container and other data sources sqlsessionfactory Containers

Within this method initBaseSqlSessionFactory Method will call all data sources in the database , except yml Master data source configured in , Other data is initialized in this method

3. DataSourceContext class

The initialization container related methods called in the multi data source switching template just mentioned are in this class

4. MultiSourceExAop class

Switch the aspect of the data source , Scanning to @DataSource Triggered on annotation