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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2020/01/19 04:20:59 UTC

[GitHub] [incubator-shardingsphere] kimmking commented on issue #4014: Not support JDBC getCatalog

kimmking commented on issue #4014: Not support JDBC getCatalog
URL: https://github.com/apache/incubator-shardingsphere/issues/4014#issuecomment-575965787
 
 
   @shalousun  Actually, mysql&oracle doesn’t support catalog. 
   
   In a abstract Database model, a db instance contains several catalogs, each catalog contains several schema, every schema have many tables/views and other objects.Then we used to use Database in a specified case instead of the two concepts: catalog&schema. In mysql jdbc driver, the method connection.getCatalog will return databaseName string.
   
   We can use null or databaseName(mysql)/userName(oracle) instead of catalog in many methods like your above codes.
   
   Further more, sharding jdbc/proxy can wrap and route a logic database to more than one database, so we can't decide which db name should be returned to caller. So, then you will know as a result, sharding jdbc/proxy can't support the feature till now.

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