Question

I’m trying to connect to my postgresql database using Lazarus pascal. I get this error towards the end of compilation (F9).

mainform.pas(112,35) Error: Wrong number of parameters specified for
call to “Create”

Here’s my code:

  dbConn:= TSQLConnection.Create(nil);    
  dbConn.HostName := '<IP goes here>';    
  dbConn.DatabaseName:= 'dbMydb';    
  dbconn.UserName:='me';    
  dbConn.Password:='pas';    
  dbConn.Open;

  //Bind the Transaction AND Query components to the DB connection

  dbQuery_Menu := TSQLQuery.Create; //This is the line with the error    
  dbQuery_Menu.Database := dbConn;    
  dbQuery_Menu.Transaction := dbTrans ;

I’m really exhausted trying to figure this out… Any help please…

The above code was adapted from here.

Answer 1

It seems which the documentation is outdated, the TSQLQuery descends from the TCustomSQLQuery class where the constructor is defined like

 constructor Create(AOwner : TComponent); override; 

So you need to modify your code like this

dbQuery_Menu :=TSQLQuery.Create(nil);