Prepared_Statement :(

[eduardsapotski@gmail.com]

Trying insert data into PostgreSql:

   function Insert_Trade(Trade : Trade_Type) return Boolean is 
      
      Conn   : Database_Connection := Build_Database_Connection;
      PS     : Prepared_Statement  := Prepare(Query => "INSERT INTO exmo.trades(trade_id, pair, type, price, quantity, amount, date) VALUES (?, ?, ?, ?, ?, ?, ?)");             
      Params : SQL_Parameters(1..7);
      FC     : Forward_Cursor;
      
      Result : Boolean := False;
         
   begin

      Params(1) := "+"(Trade.Trade_ID);
      Params(2) := "+"(Trade.Pair);
      Params(3) := "+"(Trade.Direction);
      Params(4) := "+"(Trade.Price'Img);
      Params(5) := "+"(Trade.Quantity'Img);
      Params(6) := "+"(Trade.Amount'Img);
      Params(7) := "+"(Trade.Date);
    
      Execute (Conn, PS, Params);
        
      Commit_Or_Rollback(Conn);
      
      Put_Line(Conn.Last_Error_Message);
      
      return Result;
      
   end;

Result:

ERROR:  syntax error at or near ","
LINE 1: ...ir, type, price, quantity, amount, date) VALUES (?, ?, ?, ?,...
                                                             ^

What's wrong? :( 
Can anyone have a working example?