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Parameter settings for BDE

Posted on 2003-11-19
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Last Modified: 2013-11-23
Writing in Delphi on Windows 2000
Using BDE to access a MS/SQL database
I am still confused of which value setting is really used : the one defined in the BDE settings (BDE administrator) or the one via the Params property (Values[...]) of the TDatabase object which is used ?
Putting TIMEOUT to 20 in the BDE admin setting and the same to 5 at execution time shows that the one which is taken into account is through the BDE (I just issued a very long query in my exe and it failed on time out, but after 20 seconds, not 5).
My real problem is that I want to have it setup at run time !
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Question by:LeTay
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LVL 27

Expert Comment

by:kretzschmar
ID: 9780001
you must close and reopen the tdatabase to get the effect

meikl ;-)
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Author Comment

by:LeTay
ID: 9785548
This is was I do, indeed.
My application is a command line exe which accepts a parameter /t:n which means to put a time out of n seconds on the query. If error at execution due to the time out, I display an error message saying 'time out on query'
Now step by step
1. BDE Administrator -> timeout 10 -> save -> exit
2. From a prompt : myapp.exe /t:2 (the app runs a query that takes at least 15 seconds to answer)
3. I get Time out on query after +/- less 10 seconds
4. BDE Administrator -> timeout 2 -> save -> exit
5. From a prompt : myapp.exe /t:10
6. I get Time out on query after +/- less 2 seconds
This proves that the BDE takes the setting into account according the the BDE setup, not my program...
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LVL 27

Expert Comment

by:kretzschmar
ID: 9785642
which components do you use?

your tquery must be linked to your tdatabase and not to the alias,
whereas your tdatabase may linked to the alias, but
the alias-parameters are then overwritten with the TDatabase-parameters

meikl ;-)
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Author Comment

by:LeTay
ID: 9786858
Here is part of the coding that shows you what is used (no alias etc...).
I setup a lot of these Params.Values and these are taken into account (user name, password etc...)
ps : there is maybe a monitoring tool to see what happens ?

.../...
 DB1:TDatabase;
 SP:TStoredProc;
.../...
 with DB1 do
  begin
   DatabaseName   := 'MyDataBase';
   AliasName      := '';
   DriverName     := 'MSSQL';
   KeepConnection := True;
   LoginPrompt    := False;
   SessionName    := SessionName;
   with Params do
    begin
     Values['DATABASE NAME']      := 'MyDataBase';
     Values['APPLICATION NAME']   := 'Duplicates';
     Values['SERVER NAME']        := 'MyServer';
.../...
     Values['TIMEOUT']            := TimeOut;
    end;
.../...
 with SP do
  begin
   DatabaseName   := DB1.DatabaseName;
   StoredProcName := 'MyStoredProcedure';
   Params.Clear;
.../...
  end;


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LVL 27

Expert Comment

by:kretzschmar
ID: 9787027
hmm,
looks all correct

i did a bit recherche:
---- from delphi helpfile
property Params: TStrings;

Description

Use Params to examine or specify database connection parameters, such as path name, server name, schema-caching size, language driver, user name, and password. Actual parameters in Params differ depending on the current BDE alias and driver for the database component.

Params is a list of string items, each representing a different database connection parameter. If the AliasName property specifies a valid BDE alias, then Params automatically contains the parameters defined for that alias. If, instead of providing an alias, an application uses the DriverName property to provide a local alias, the application must provide Params values directly.

Note:      Applications can use Params to override the default settings supplied by a BDE alias.
Tip:      At design time double-click a TDatabase component to invoke the Database editor and set Params.
--------
i followed the tip, and in this dialog is a "Defaults"-Button
which lists this
list of default-parameters from the MSSQL-Driver
-------
DATABASE NAME=
SERVER NAME=MSS_SERVER
USER NAME=MYNAME
OPEN MODE=READ/WRITE
SCHEMA CACHE SIZE=8
BLOB EDIT LOGGING=
LANGDRIVER=
SQLQRYMODE=
SQLPASSTHRU MODE=SHARED AUTOCOMMIT
DATE MODE=0
SCHEMA CACHE TIME=-1
MAX QUERY TIME=300
MAX ROWS=-1
BATCH COUNT=200
ENABLE SCHEMA CACHE=FALSE
SCHEMA CACHE DIR=
HOST NAME=
APPLICATION NAME=
NATIONAL LANG NAME=
ENABLE BCD=FALSE
TDS PACKET SIZE=4096
BLOBS TO CACHE=64
BLOB SIZE=32
PASSWORD=
----------------
timeout is not in the list,
so i guess this parameter cannot overloaded with TDatabase-Params

serching on the net now

meikl ;-)
0
 

Author Comment

by:LeTay
ID: 9787245
Looks like you are right.
I did another test with te CONNECT TIMEOUT.
Same result, and like TIMEOUT, not in this list.
If it appears to be not modifiable, this is really a pitty.
But whatever the final real solution/reason is, I think you will get the points...
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LVL 27

Expert Comment

by:kretzschmar
ID: 9787434
there may be a chance to set the driver-parameter with the bde-api,
trying it now, be patient, this may take some time
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LVL 27

Accepted Solution

by:
kretzschmar earned 750 total points
ID: 9788017
hi,
bad news,
i can retrieve the value, but i can't set it :-(
(the api has no method for this)

meikl ;-)
0
 

Author Comment

by:LeTay
ID: 9795636
Well, shall be abandon ?
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9795659
let us wait, until weekend is finished
(will do at weekend a new try)
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LVL 27

Expert Comment

by:kretzschmar
ID: 10776382
oops, sorry,
missed the feedback :-))

but found no way, sorry

meikl ;-)
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