Class: pgSQL Abstract

This is a wrapper class to simplify PostgreSQL queries. This is the PostgreSQL version of another previously submitted here to access MySQL for the same purpose.

It features:

- Connect to a PosgreSQL server reusing connections previously opened to the same server
- Insert or update rows using arrays of fields and values
- Delete rows that satisfy a given condition
- Retrieve the next unused field id
- Select single field values providing a default value in case no row is returned

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