[BUG] Oracle DB data integration not working about mage-ai

[AlekHed]

I have the same problem. Oracle DB integration has some weak points:

1. It uses "SELECT name FROM v$database" query for testing connection. User need to have "GRANT SELECT ANY DICTIONARY TO user" for this query to work. Better solution imo is to use something like "select sys_context( 'userenv', 'current_schema' ) from dual" query.

2. Its possible to define schema for connection if you redefine property table_prefix in OracleDB class. I set it to read schema from self.config['schema'] if it exists in my local version. It could solve 90% problems with schemas. But most correct solution of course is to use schema from table definition.

3. For Oracle versions prior to 12 _limit_query_string makes incorrect query string. Feels like connector need parameter to support old version recipe. But its complex modification. Need more hooks to query at sql base class.

[amukhsimov]

Hello!

I think I found the problem. In mage_integrations/mage_integrations/sources/oracledb/init.py when mage discovers the schema it doesn't consider table owner (schema) (screenshot 1).

Then in mage_integrations/mage_integrations/sources/sql/base.py discover function, it passes stream_id as tap_stream_id to __fetch_rows function (whereas stream_id is only a TABLE_NAME).

__fetch_rows uses build_table_name function, which returns f'{self.table_prefix}{table_name}', whereas self.table_prefix returns '' (empty string)

Can we add the schema to the Oracle source (data integration)?