i have an access 2003 db :
username password
mmm 123
aaaa 321
....
i want to compare a username if it exist in the database by a for loop
i use dbgrid to show the DB
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
>i want to compare a username if it exist in the database
best would be a select for this
like
select * from your table where username = :YourUserName
but as you want
for iteration with a loop
Dataset.First;
while (not(Dataset.Eof) and (DataSet.FieldByName('User
if not(Dataset.Eof) then //found
hope this helkps
meikl ;-)
if you want a loop ro read each row & each field of that row then:
Table1.First;
while not Table1.EOF do
begin
for I:= 0 to Table1.FieldsCount - 1 do
if Table1.Fields[I].asString = ? then
//do something here
Table1.Next;
end;
if you want a loop to read each row & check a particular field for a value (Example: UserName)
Table1.First;
while not Table1.EOF do
begin
if Table1.FieldByName('UserNa
//do something here
Table1.Next;
end;
Business Accounts
Answer for Membership
by: Ivanov_GPosted on 2004-05-12 at 06:17:40ID: 11049555
var found : Boolean;
begin
found := DBGrid1.DataSource.DataSet
if found then
ShowMessage('username MMM exists')
else
ShowMessage(user MMM does not exist);
end;