Postgres - Interface

[flurfis]

Summary

Implemented a PostgreSQL interface (PGInterface). With the interface, it is possible to connect to polypheny via the PostgreSQL JDBC driver.

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Changes

The interface is mainly isolated from the rest of the code, so apart from the new features, no changes to the existing architecture were done.

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Features

• Ability to create a PGInterface via the UI
• Connect with a PostgreSQL JDBC driver to Polypheny via the PGInterface
• Execute queries through this connection

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Tests

The tests were implemented in the dbms module.

• Integration tests for the PGInterface - tests simulate a client who uses PostgreSQL JDBC
• Some DML, DQL and DDL commands are tested
• Prepared Statements are tested

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ToDo

There are several starting points for future work. Some major points of interest are listed below, and smaller ToDo's are marked in the code.

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)
• Implement SSL - support into Netty (--> enable other authentication methods)
• Support and test more data types
• Support and test more SQL commands (mainly TCL and DCL)
• Improve how incoming messages are categorized
• Improve how information from the incoming messages is gathered
• Support Prepared Statement sent via the JDBC framework