Change the path to the connection of my database.

Dear Experts,

I have a programm that has a connection to a Access-database.
I have used the ADOConnection1 and the ADOQuery1-components.
Everything works fine.

This what I have as connection string property:
provider=microsoft.jet.OLEDB.4.0;Data Source=C:\Users\Brandon\Documents\MyProject\test,mdb;Persist Security info=false

and I want it change to this:

provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='+IncludeTrailingPathDelimiter(ExtractFilePath(Application.ExeName))+'Database.pkd;';

But where do i have to put it?

Greetings, Peter Kiers
LVL 1
Peter KiersOperatorAsked:
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Randy Wilson.Net DeveloperCommented:
It would go in the ConnectionString property of your ADOConnection1 object.
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Peter KiersOperatorAuthor Commented:
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?
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rfwoolfCommented:
Assuming your ADOConnection1 is on a DataModule, you would go to your DataModule's oncreate event and say
ADOConnection1.close;
ADOConnection1.ConnectionString := 'provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='+IncludeTrailingPathDelimiter(ExtractFilePath(Application.ExeName))+'Database.pkd;';
ADOConnection1.Open;

When you do a final build of your application, make sure the ADOConnection1 is not connected because as you know this gets set now at runtime
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rfwoolfCommented:
"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';
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rfwoolfCommented:
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;
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FactorBCommented:
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.
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FactorBCommented:
Ups, again something similar was posted during the time I was typing, I should take touch typing classes :)
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Peter KiersOperatorAuthor Commented:
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'
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rfwoolfCommented:
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
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Peter KiersOperatorAuthor Commented:
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
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FactorBCommented:
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 :))
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Randy Wilson.Net DeveloperCommented:
Make it a string and remove a parenthesis

IncludeTrailingPathDelimiter("ITKnowledgeBase.exe")+
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Randy Wilson.Net DeveloperCommented:
Never mind my last, not paying attention...
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Peter KiersOperatorAuthor Commented:
It works. One little question, the connectionstring line is a very long line
where can I break the line. Is this possible?
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rfwoolfCommented:
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'
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FactorBCommented:
procedure TForm1.FormCreate(Sender: TObject);
var
conn_str:string;
begin
conn_str:='provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source=';
conn_str:=conn_str+IncludeTrailingPathDelimiter(ExtractFilePath(ITKnowledgeBase.exe));
conn_str:=conn_str+'test.mdb;';
ADOConnection1.Connected:=False;
ADOConnection1.ConnectionString:=conn_str;
ADOConnection1.Connected:=True;
end;
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FactorBCommented:
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));
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