TFDQuery.Prepare cannot determine parameter types for INSERT query on MS SQL SERVER

Question

I open a TFDConnection for MS SQL Server with parameters:

DriverID=MSSQL
Password=test
User_Name=test
Server=VS2003-2008
Database=test
Single Co         


        

Answer 1

Set each of your parameters DataType property, and then you can call Prepare ie:

  qry.ParamByName('foo').DataType := TFieldType.ftString;
  qry.ParamByName('bar').DataType := TFieldType.ftInteger;
  qry.Prepare;

The DataType property is of type Data.DB.TFieldType, here is a list of all possible values