Error SQL0519N occurs on call to ExecuteReader() when connected to DB2 7VR3

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Title	Error SQL0519N occurs on call to ExecuteReader() when connected to DB2 7VR3

URL Name	error-sql0519n-occurs-on-call-to-executereader-when-connected-to-db2-7vr3

Article Number	000120965

Environment	Product: Connect for ADO.Net DB2 Provider Version: 4.2 O/S: Windows Database: DB2 Application: N/A

Question/Problem Description

Error SQL0519N occurs on call to ExecuteReader() when connected to DB2 7VR3

Steps to Reproduce

Clarifying Information

Occurs when running the following code :

try
{
while (true)
{
using (DB2Connection connection = new DDTek.DB2.DB2Connection("Database Name=dbname;Host=localhost;Password=***;Persist Security Info=True;User ID=user; Pooling=true;port=9999"))
{

connection.Open();

DB2Command cmd = new DB2Command("SELECT * FROM TABLE.INDEX2", connection);

cmd.Transaction = connection.BeginTransaction();
DB2DataReader reader = cmd.ExecuteReader();
}
}
}
catch (Exception ex)
{
throw ex;
}

Error Message	SQL0519N

Defect Number	77900

Enhancement Number

Cause

When a reader server is executed, it returns a result-set schema, but it is believed that the DB2 Server does not open the actual result-set cursor at this point.

It appears that only when a reader.Read() operation is performed, the cursor is opened on the server side. So, when an application closes the Reader the driver only sets the CloseQuery request to the server; only if the driver has processed the data in the result-set using Reader.Read().

So far, with versions of DB2 prior to DB2v7R3, this was working as server was still able to close the result-set. However, with DB2v7R3, it appears there has been a change in this behavior.

Resolution

Planned to be addressed in version 4.3 since DB2 version 7VR3 is not supported with version 4.2 of the provider

Workaround

try
{
while (true)
{
using (DB2Connection connection = new DDTek.DB2.DB2Connection("Database=<Database Name>;Host=<Host Name>;User ID=<User Id>;Password=<Password>;Port=<Port>;Pooling=true;"))
{
connection.Open();
DB2Command cmd = new DB2Command("SELECT * FROM SYSVIEWDEP", connection);

DB2DataReader reader = cmd.ExecuteReader();

// Add the line below to avoid SQL0519N error
while (reader.Read()) { }
}
}
}
catch (Exception ex)
{
throw ex;
}

Notes

Last Modified Date	9/26/2017 8:17 PM

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Error SQL0519N occurs on call to ExecuteReader() when connected to DB2 7VR3

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