add more type support.

[dushibaiyu]

add Mysql and PGsql.
get value ib before and store in Variant

[cruisercoder]

Thanks. Will review this week.

[dushibaiyu]

I will do more fine.

[dushibaiyu]

I only test postgresql , mysql and sqlite.
Others is not test.
and Others need to make perfect.

[dushibaiyu]

add dbType().
let users through dbType() and rawData() to resolve by himself.

[cruisercoder]

can you tell me what fmt style you used (which dfmt parameters)?