asked on

Changing Strings to Char in a DataBase

I'm new to Delphi so any input will be a help. The problem is that I have to access some Fields from an Access Database, then I need to put the fields into a ListBox. The fields I'm interested in are Servers and Drives. I can put all the fields in the Listbox but I only want the Fields that have a drive letter in the " drives " field. The data base is rather large so changing it is not an option.

What I want is something to look like this

Servername
C
Servername
D
NextServer
C
Any servers without Drive letters I want to skip.

Here is some of the code.

procedure TForm1.ServersClick(Sender: TObject);
var
S : string;
D : string;
L : string;
begin
While not Table1.Eof do begin
S := Table1.FieldByName ('ServerName').AsString + ', ';
D := Table1.FieldByName ('drives').AsString;
L := S + D;
ListBox1.Items.Add(S);
ListBox1.Items.Add(D);
Table1.Next
end;

kretzschmar

hi msmouse,

this change should do it

procedure TForm1.ServersClick(Sender: TObject);
var
S : string;
D : string;
L : string;
begin
While not Table1.Eof do
begin
if Table1.FieldByName ('drives').AsString <> '' then
begin
S := Table1.FieldByName ('ServerName').AsString + ', ';
D := Table1.FieldByName ('drives').AsString;
L := S + D;
ListBox1.Items.Add(S);
ListBox1.Items.Add(D);
end;
Table1.Next
end;
end;

you can also use a tquery instead of a ttable
the sql statement is then like
select servername,drives from Tablename where drives is not null

meikl

msmouse

ASKER

Thanks for the input. Now How can I get one Drive letter at a time.

msmouse

ASKER

Sorry I didn't make myself clear, in the database the drives field may have multiple drive letters.

ie cdefg

DrDelphi

if you mean, how to prevent the drive from being added more than once, then this will work:
procedure TForm1.ServersClick(Sender: TObject);
var
S : string;
D : string;
L : string;
begin
While not Table1.Eof do
begin
if Table1.FieldByName ('drives').AsString <> '' then
begin
S := Table1.FieldByName ('ServerName').AsString + ', ';
D := Table1.FieldByName ('drives').AsString;
L := S + D;
ListBox1.Items.Add(S);
if Listbx1.IndexOf(d)=-1 then ListBox1.Items.Add(D);
end;
Table1.Next
end;
end;

kretzschmar

?

procedure TForm1.ServersClick(Sender: TObject);
var
S : string;
D : string;
L : string;
begin
While not Table1.Eof do
begin
if Table1.FieldByName ('drives').AsString <> '' then
begin
S := Table1.FieldByName ('ServerName').AsString + ', ';
D := Table1.FieldByName ('drives').AsString[1]; //Cuts only the first letter
L := S + D;
ListBox1.Items.Add(S);
ListBox1.Items.Add(D);
end;
Table1.Next
end;
end;

meikl

ASKER CERTIFIED SOLUTION

lgmm

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Begli

Listening

kretzschmar

? did lgmm answer really helped you by your problem ?

msmouse

ASKER

It helped somewhat but I couldn't get in to grade your answer. I'm new here so I haven't figured out everything yet. Is there a way to go back and accept an earlier answer? Your advice helped the most. Thanks.

kretzschmar

hi msmouse,

no, there is no way back :-(
(maybe, the ex-ex customer-service can do something)
but that doesn't matter.

next time, if you've a similar situation, just reject the given (not wanted) answer, then you've the chance to grade and accept the comment as answer which helped you mostly.

for now, you've nothing to do,
i'm glad that it helped you a bit

good luck again

meikl ;-)