Well, to start off - template is simple code substitution. You can't just
return a "proc" from a template if you didn't actually made a proc. Second of
all - if you want a template to generate a proc, it needs to have a name.
I really think that you can achieve what you want the simpler way - by using
static[string], like here:
import db_sqlite
proc checkDoubleEdge(db: DbConn, table: static[string], s, t: int): bool =
const query = "SELECT source FROM " & table & " WHERE source=? AND
target=?;"
result = (db.getValue(sql(query), s, t)).len == 0
var db = open(":memory:","","","")
echo db.checkDoubleEdge("myedge", 1, 2)
Run
By marking an argument in a proc as `static`, you tell to the compiler that
this argument should only accept arguments known at compile-time (like string
literals)
