* Replace connection handle method check_connection() with is_connected() and ping_server()
* When a connections is fetched from a pool perform a validity check which can be one of none, passive or ping.
* Add the methods is_connected() and ping_server() to the connection template class.
* Remove unused #include and add mising #include.
* Add tests for the connection methods is_connected() and ping_server().
* Use a non-UTC timezone when testing the PostgreSQL timezone support.
* Fix serialization of time of day values for PostgreSQL
* Fix serialization of PostgreSQL values for "timestamp with time zone" and "time with time zone" fields.
Add support for connection pooling
* Add support for connection pooling to the core code.
* Add support for PostgreSQL connection pooling with tests.
* Add support for SQLite3 connection pooling with tests.
* Add support for MySQL connection pooling with tests.
- The postgres connection does not change the connection_config thus passing it as const.
- Implies 'thread safety' when using the same config for multiple connections
Co-authored-by: Carel Combrink <carel.combrink@vastech.co.za>
* When inserting values into "timestamp with time zone" fields treat the value as being in the UTC time zone.
* Simplify parsing of PostgreSQL date/time responses by using regular expressions. Always convert response times with time zone to UTC.
* Add tests which check if timestamp and date fields are treated as having a UTC time zone.
* Clarify the test comments.
Add Connector Cmake logic
* Also install date when used with fetch content
* Install everything always
* Update documentation
* Add option to control dependency searching
* Adjust travis
Removed timezone handling in the process (needs to be documented).
Note: on_conflict does not check for constraints (needs to be documented).
Note: some of the constraints tests seem to be aiming for a different static_assert.
