FEATURE: Database - Postgres support in data/repo - Part 1

[kishorereddy]

Overview

Support for Postgres in the data/entities components ( PostgresDialect and Repo<TId, T> )

1. Changes: Actual code changes are fairly isolated/limited
2. Unit-Tests: Majority of the files changed are actually cleanup/restructuring of unit-tests

Ticket(s)

#370

Links(s)

1. https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
2. https://www.postgresql.org/docs/current/datatype.html
3. https://www.baeldung.com/java-postgresql-store-date-time

Dependencies

1. Postgres: 14.7
2. Driver: 42.3.3
3. JDBC: org.postgresql.Driver

Setup

implementation "org.postgresql:postgresql:42.3.3"

Design

1. Docker: Updated docker-compose to include mysql and postgres
2. Install: Updated mysql and postgres install scripts for docker init
3. Table: Added sample table for tests install/db/mysql/3.x/00-setup-01-unittests.sql
4. Vendor: Added new enum for Postgres as a vendor
5. Connection: Fixed connection string loading ( still needs improvement - future )
6. Dialect: Added new PostGresDialect just like MySqlDialect
7. Schema: Updated code to support Postgres schema ( Select/Insert/Update/Delete) statements
8. Tests: Lots of unit-tests reorganized and cleaned up.

Notes

1. Also added postgres to Docker compose
2. Some types need to be mapped / named differently ( See below )

bigint          = bigserial ( primary key only )
nvarchar        = varchar
double          = float8
local datetime  = timestamp
zoned datetime  = timestamptz

Pending

1. Connection: The connection string loading still needs to be further improved in a future PR.
2. Unit-tests: Some unit-tests still need improvement ( next pr )
3. Setup: The setup of new model/entity should be simpler ( maybe compatible with Java JPA ).

Tests

Unit-tests have been significantly changed for this PR (but mostly moved and/or renamed )

1. Package : Tests are now mostly in the data package
2. SubFolders Tests are further organized into sub-packages under data for db, mapper, query, repo, stmt
3. Reusable: Tests are reused from base classes, for running same tests against mysql and postgres