Feature request: PPX support format to include value

[Et7f3]

~~

let a = 4 in
[%pgsql dbh "execute" "something $a"]

~~
I think it work fine but I have tested something="drop table" and something="select" the last one work under MySQL but don't under postgresql. So I shout manually escape and execute ... 😭

this is also in feature request: ```
let b = Printf.sprintf "something '%d'" 5 in
[%pgsql dbh "execute" b]

EDIT: explain why I have strike text.

[chrismamo1]

I'm not sure I understand your first problem. Can you please provide more details?

As for the feature request:

let b = Printf.sprintf "something '%d'" 5 in
[%pgsql dbh "execute" b]

This is impossible, because of how the PPX works. The SQL expression (the string at the end of [% ... ]) is dealt with entirely at compile time, and cannot be made from a runtime value. Please let me know if this is clear enough, or check https://github.com/darioteixeira/pgocaml/blob/master/doc/HOW_IT_WORKS.txt for a better (albeit slightly outdated) explanation.