Question

Error trying to connect to advantage database server using ADS dataprovider

Asked by: MCLR

I am trying to integrate alongside an existing application that uses ADS as its database.
When i connect my integration app using the code below it connects fine until i try and run the original application at the same time. It seems to only allow one connection, my application seems to hold the connection and block all others. Yet i can have multiple instances of the original application running conncurrently with no issue. Which leads me to believe that its the way in which i am trying to correct from my c# app. The error im getting when the original app is open and i then try to connect with my integration app is "The Advantage Data Dictionary cannot be opened.  axServerConnect" .

Also i have tried changing the connection string to point to the folder instead of the actual dictionary so instead of c:\Cash4W\data\CashForWindows.Add i was trying to connect to c:\Cash4W\data but then i got the error
Error on connection 1 Error 7200:  AQE Error:  State = HY000;   NativeError = 5159;  [iAnywhere Solutions][Advantage SQL][ASA] Error 5159:  Error encountered when trying to open a database table.  The table is a database table. It cannot be opened as a free table. Table name: call  AdsCommand query execution failed.

Anyone any suggestions ??

AdsConnection connection = new AdsConnection();
AdsCommand cmd = new AdsCommand();
AdsDataAdapter adapter = new AdsDataAdapter();
DataSet dset = new DataSet();
 
Connectionstring = "Data Source=c:\Cash4W\data\CashForWindows.Add;user ID="Adssys";ServerType=ADS_LOCAL_SERVER;TrimTrailingSpaces=True;        
 
connection.ConnectionString = Connectionstring;
connection.Open();
                   
string sql = " SELECT top 1 * from call";
 
cmd.CommandText = sql;
cmd.Connection = connection;
adapter.SelectCommand = cmd;
adapter.Fill(dset);
if (dset.Tables[0].Rows.Count > 0)
{
     success = true;
 
}

                                  
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Asked On
2008-10-17 at 04:20:17ID23823423
Tags

Advantage Database server

,

c#

Topics

Databases Miscellaneous

,

Delphi Database

,

C# Programming Language

Participating Experts
1
Points
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Comments
6

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Answers

 

by: LacutahPosted on 2008-10-17 at 07:27:08ID: 22741136

Two possible solutions - both addressing the problem that your code doesn't close the connection:
1.  The default .net data adapters will automatically open and close the connection for you - do not manually open the connection, and it will be open / closed automatically by the adapter.

2.  Call connection.Close() after you call adapter.Fill(dset)

 

by: MCLRPosted on 2008-10-17 at 07:31:36ID: 22741199

sorry i forgot to put that line in i had  connection.Close(); in the finally part of a try statement

I tried removing the manual connection open though as in your suggestion 1 but the same issue was happening , any other ideas ?
Thanks

 

by: LacutahPosted on 2008-10-17 at 07:58:34ID: 22741555

Does the AdsConnection expose a Dispose method that you should be calling after Close?

 

by: MCLRPosted on 2008-10-17 at 08:03:23ID: 22741628

It does have a dispose method but Its not opening the connection for me in the first place when i have the original app open. so while i can open multiple instances of the original app i cant open my new app unless i close the original app and vice versa.

So i guess i need to be connecting to the database a different way ??
I tried changing around the additional connection string settings SecurityMode=ADS_IGNORERIGHTS;LockMode=ADS_COMPATIBLE_LOCKING but this made no difference either

 

by: LacutahPosted on 2008-10-17 at 08:15:00ID: 22741784

I'm sorry, I was misunderstanding - "my application seems to hold the connection and block all others"

Looks like you may need to follow up with iAnywhere Solutions - I'm out of my realm now.

 

by: MCLRPosted on 2008-10-22 at 06:54:46ID: 22776579


It turns out that i needed to change the servertype to remote instead of local and then i had the incorrect version of the advantage data provider so i had to download version 8.1 instead of 9.

Then the issue was resolved

Connectionstring = "Data Source=c:\test.Add;user ID="Adssys";ServerType=remote;TrimTrailingSpaces=True;        
 
                                              
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