On Fri, Dec 14, 2018 at 02:47:12PM +0300, Dmitry Igrishin wrote: > пт, 14 дек. 2018 г. в 14:33, Oleg <lego12239@xxxxxxxxx>: > > > > Hi, all. > > > > Do we really need a numeric value placeholders like $1 in command string? > It's a syntax defined at the backend side. > (https://www.postgresql.org/docs/current/sql-prepare.html) I know this, but i can't understand why this approach is used. > > Construction of such string for complex non-static queries is very annoying. > That's why there are libraries like Pgfe > (https://github.com/dmitigr/pgfe) or libpqtypes This is C++ :-(. > (http://libpqtypes.esilo.com/) This is great! PQexecf() is what i need. Why this api is not the part of libpq? Thank you for the link! > > Why do we can't simply use $$ placeholder, which take the next value from an > > array of values? > Because $$ means a dollar-quoted opening tag > (https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-DOLLAR-QUOTING) Ok. We can use any other placeholder string for such purpose. But not numeric placeholders - these are not convenient. -- Олег Неманов (Oleg Nemanov)
