Detecting MEDIUMTEXT vs. VARCHAR in a DBGrid

[Susan Leigh]

I'm using Delphi 7, MySQL 5.0, MyODBC connector 3.51 with an ADODataSet component from the ADOnis component suite by Winsoft.

In my program's DBGrid, I want VARCHAR fields to be displayed and edited on the grid, but MEDIUMTEXT fields to be edited in a popup edit window. When connecting to a MS Access or MS SQL database, this was no problem: I could look at TField.DataType and if it was ftMemo, then I knew it was a memo field (the equivalent of MySQL's MEDIUMTEXT) and override the default DBGrid editor with my own popup window. But when connecting to a MySQL database, TField.DataType shows both VARCHAR and MEDIUMTEXT as ftString, so I can't tell the difference. Anyone know how I can distinquish?