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September 16, 2013

Connecting to Databases through X++ PART -III

Connecting to Databases through X++ PART -III

      OLEDB Connection:

OLEDB is a set of APIs designed by Microsoft and used for accessing different types of data stored in a uniform manner. Dynamics AX as such doesn’t have any specific classes built for this purpose. But one can make use of .Net Framework’s System.Data.OleDb namespace through AX’s COM Interoperability feature and use it in AX.
Below is an example code that depicts this scenario:
static void dbOLEDBConnection(Args _args)
{
    System.Exception                    e;
    System.Data.OleDb.OleDbConnection   objConn;
    System.Data.OleDb.OleDbCommand      cmdSelect;
    System.Data.OleDb.OleDbDataReader   reader;
    InteropPermission                   perm;
    str connectStr = "Provider=SQLNCLI.1;Integrated Security=SSPI;"+
                     "Persist Security Info=False;Initial Catalog=AX2009;Data Source= theAxapta ";
    str exceptionStr;
    ;
    try
    {
        perm = new InteropPermission(InteropKind::ClrInterop);
        if (perm == null)
        {
            throw error("Error with file permissions");
        }
        perm.assert();
        objConn = new System.Data.OleDb.OleDbConnection(connectStr);
        objConn.Open();
        cmdSelect   = objConn.CreateCommand();
        cmdSelect.set_CommandText("SELECT * FROM CustTable where DATAAREAID = ‘CEU’");
        reader      = cmdSelect.ExecuteReader();
        while (reader.Read())
        {
            info(reader.GetString(0));
        }
    }
    catch(Exception::CLRError)
    {
        CodeAccessPermission::revertAssert();
        perm = new InteropPermission(InteropKind::ClrInterop);
        if (perm == null)
        {
            return;
        }
        perm.assert();
        e = ClrInterop::getLastException();
        CodeAccessPermission::revertAssert();
        while( e )
        {
            exceptionStr += e.get_Message();
            e = e.get_InnerException();
        }
        info(exceptionStr);
    }
    catch
    {
        error("An Exception has occurred");
    }
    if(objConn)
        objConn.Close();
}


Other related posts:



-Harry

2 comments:

  1. Hi, I have this code in a method to connect to a database and it works fine. But I have another method with the same code and it get's me an error, I'm desperate!!!! I can't do it!!!!!

    ReplyDelete
    Replies
    1. can you please some more details about your issue, where you are using bith codes?

      Delete

Thanks