Change the path to the connection of my database.

i did or it doesn't work or the syntax is not right.

provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='+IncludeTrailingPathDelimiter(ExtractFilePath(ITKnowLedgeBase))+'test.mdb

is this line correct?

"is this line correct?"

Normally I do just fine without "includingtrailingpathdelimiter"
So try this:


ADOConnection1 := 'provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=' + ExtractFilePath(Application.ExeName) + 'test.mdb';

I left out "ConnectionString".
Now I forget whether you need to put the \ slash in it or not.
Do yourself a favour and debug this one yourself (because it's fun).
Put a showmessage:

ADOConnection1.ConnectionString := 'provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=' + ExtractFilePath(Application.ExeName) + 'test.mdb';
Showmessage(ADOCinnection1.ConnectionString);

If it shows C:\Users\Brandon\Documents\MyProjecttest.mdb
then you know you need to add a '\' to 'test.mdb;

For example on form create, note that you can not change connection string on AdoConnection1 that is already connected, so you need to disconnect, change and reconnect this way, then later you can execute queries or open tables that are associated with AdoConnection1 (or use the name of your connection)

procedure TForm1.FormCreate(Sender: TObject);
begin
ADOConnection1.Connected:=False;
ADOConnection1.ConnectionString:='provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='+IncludeTrailingPathDelimiter(ExtractFilePath(Application.ExeName))+'Database.pkd;';
ADOConnection1.Connected:=True;
end;

Regards,
B.

Ups, again something similar was posted during the time I was typing, I should take touch typing classes :)

I have this:

procedure TForm1.FormCreate(Sender: TObject);
begin
ADOConnection1.Connected:=False;
ADOConnection1.ConnectionString:='provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='+IncludeTrailingPathDelimiter(ITKnowledgeBase.exe))+'test.mdb;';
ADOConnection1.Connected:=True;
end;

In the (Application.ExeName))-part I have put:
ITKnowledgeBase.EXE

But i get undeclared identifier: 'ITKnowledgeBase'

No no no, where it says 'Application.Exename' don't replace it with your application's exename, leave it exactly as it is
By the way, ExtractFilePath uses SysUtils, just in case you didn't add it to your uses list

I forgot something to put in the OnCreate -event:

procedure TForm1.FormCreate(Sender: TObject);
begin
ADOConnection1.Connected:=False;
ADOConnection1.ConnectionString:='provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='+IncludeTrailingPathDelimiter(ExtractFilePath(ITKnowledgeBase.exe))+'test.mdb;';
ADOConnection1.Connected:=True;
end;

Greetings, PK

Application.exename is actually a full application path+name, it shouldn't be changed...proper format is:

IncludeTrailingPathDelimiter(ExtractFilePath(Application.ExeName))

Or translated into ordinary language extract the file path [ExtractFilePath] of my application [Application.ExeName] and use the backslash on the end [IncludeTrailingPathDelimiter].

(Or at least I think that is the meaning :))

Make it a string and remove a parenthesis

IncludeTrailingPathDelimiter("ITKnowledgeBase.exe")+

Never mind my last, not paying attention...

It works. One little question, the connectionstring line is a very long line
where can I break the line. Is this possible?

It is not possible because it needs one single string. However, you can always put line breaks in your source code like this:
ADOConnection1.ConnectionString := 'This is an example' +
  ' of multiple lines ' +
 'of text';

..which will add up to 'This is an example of multiple lines of text'

I modified your solution and I haven't noticed that I copied ITKnowledgeBase.exe instead of application.exename

Please change

conn_str:=conn_str+IncludeTrailingPathDelimiter(ExtractFilePath(ITKnowledgeBase.exe));

with

conn_str:=conn_str+IncludeTrailingPathDelimiter(ExtractFilePath(Application.Exename));