sqlite3_bind_parameter_count —
Number Of SQL Parameters
int
sqlite3_bind_parameter_count(sqlite3_stmt*);
This routine can be used to find the number of SQL parameters in a prepared
  statement. SQL parameters are tokens of the form "?",
  "?NNN", ":AAA", "$AAA", or "@AAA" that
  serve as placeholders for values that are bound to the parameters at a later
  time.
This routine actually returns the index of the largest (rightmost)
    parameter. For all forms except ?NNN, this will correspond to the number of
    unique parameters. If parameters of the ?NNN form are used, there may be
    gaps in the list.