[fpc-pascal]SQLite and NULL Strings...
prologic at daisy.ods.org
Mon Jul 14 15:06:06 CEST 2003
On Mon, Jul 14, 2003 at 09:59:17AM +0200, Michael Van Canneyt wrote:
> On Mon, 14 Jul 2003, James Mills wrote:
> > Hi,
> > This is a very weird behaviour I've found of either SQLite, or the Unit.
> > I'm not sure... I have been discussing this same problem on the SQLite
> > mailing list but without success there, so perhaps someone here might
> > know...
> > I have attached a test database, which contains 1 database entry, null
> > strings are inserted using NULL... Check the database schema yourself.
> > The problem therein lies in the fact that test3.pas returns "" for the
> > query: SELECT channelNotice FROM channels WHERE channel LIKE '#ProLogiTech';
> > It should return a null string as it does in test2.pas and in the sqlite
> > shell program.
> The problem is that an implicity conversion from Nil to empty string is
> done. You cannot solve this as long as stringlists are used to contain
> the data. (ok, you could set 'Null' as the string, but that is sloppy)
> You'd need to have (as a minimum) an array of TField records:
> TField = Record
> IsNull : Boolean;
> Value : String;
> But this will require major changes, so I suggest trying to find or
> implement a TDataset descendent for SQLIte, this will solve most of
> your problems at once.
Where might I find such a descendent that using SQLite ? I'm not quite
sure what I'm looking for here... An initial search on google provides
some delphi units that are probably not what I'm looking for.
> fpc-pascal maillist - fpc-pascal at lists.freepascal.org
- James Mills
Zero Defect Software Engineers Group - ZDSEG
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