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DB2 - Problem description

Problem IC69553 Status: Closed

STORED PROCEDURE PARAMETERS CORRUPTED DURING PREPARE USING
EXECUTEREADER METHOD OF ODBC INTERFACE AND C# PROGRAM

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
Problem Abstract: 
The parameters of a stored procedure call get corrupted during 
the prepare phase when using the ODBC Interface to execute the 
SQL with the ExecuteReader method. 
 
Client: Windows 2003 64 Bit, DB2 V9.1 FP6a 64 Bit 
Server: remote zOS based DB2 8.1.5 database stored procedure 
 
How easy is problem to reproduce? Easy 
 
Problem Desc: 
The ExecuteReader() method will produce unexpected results 
depending on how the stored procedure uses the corrupted stored 
procedure parameters. 
 
Here is a c# program that uses ODBC interface that can reproduce 
this defect: 
using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Data.Odbc; 
using System.Data.OleDb; 
 
namespace testDB 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            string cmdstr = ""; 
            if (args.Length > 0) 
            { 
                cmdstr = args[0]; 
            } 
            TestODBCDB2(cmdstr); 
        } 
 
        static void TestODBCDB2(String cmdstr) 
        { 
            // create and open a new connection 
            try 
            { 
                // open the connection 
                Console.WriteLine("Openning connection...."); 
                String connStr = 
"DSN=SAMPLE;UID=UserID;PWD=password;DATABASE=SAMPLE;WSID=serv 
erName"; 
                OdbcConnection Conn = new 
                OdbcConnection(connStr); 
                Conn.Open(); 
                OdbcCommand command = new OdbcCommand("call 
TEST_STORED_PROC ('Param1',0);"); 
                command.Connection = Conn; 
                OdbcDataReader reader = 
command.ExecuteReader(System.Data.CommandBehavior.SequentialAcce 
ss); 
                Console.WriteLine("printing result"); 
                while (reader.Read()) 
                { 
                    for (int i = 0; i < reader.FieldCount; i++) 
                    { 
                        Console.Write(reader.GetValue(i)); 
                        Console.Write("\t"); 
                    } 
                    Console.WriteLine(""); 
                } 
                command.Dispose(); 
                Console.WriteLine("done"); 
            } 
 
            catch (Exception e) 
            { 
                Console.WriteLine(e.ToString()); 
                Console.WriteLine(e.StackTrace); 
            } 
        } 
    } 
}
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* Problem Abstract:                                            * 
*                                                              * 
* The parameters of a stored procedure call get corrupted      * 
* during                                                       * 
* the prepare phase when using the ODBC Interface to execute   * 
* the                                                          * 
* SQL with the ExecuteReader method.                           * 
*                                                              * 
*                                                              * 
*                                                              * 
* Client: Windows 2003 64 Bit, DB2 V9.1 FP6a 64 Bit            * 
*                                                              * 
* Server: remote zOS based DB2 8.1.5 database stored procedure * 
*                                                              * 
*                                                              * 
*                                                              * 
* How easy is problem to reproduce? Easy                       * 
*                                                              * 
*                                                              * 
*                                                              * 
* Problem Desc:                                                * 
*                                                              * 
* The ExecuteReader() method will produce unexpected results   * 
*                                                              * 
* depending on how the stored procedure uses the corrupted     * 
* stored                                                       * 
* procedure parameters.                                        * 
*                                                              * 
*                                                              * 
*                                                              * 
* Here is a c# program that uses ODBC interface that can       * 
* reproduce                                                    * 
* this defect:                                                 * 
*                                                              * 
* using System;                                                * 
*                                                              * 
* using System.Collections.Generic;                            * 
*                                                              * 
* using System.Text;                                           * 
*                                                              * 
* using System.Data.Odbc;                                      * 
*                                                              * 
* using System.Data.OleDb;                                     * 
*                                                              * 
*                                                              * 
*                                                              * 
* namespace testDB                                             * 
*                                                              * 
* {                                                            * 
*                                                              * 
* class Program                                                * 
*                                                              * 
* {                                                            * 
*                                                              * 
* static void Main(string[] args)                              * 
*                                                              * 
* {                                                            * 
*                                                              * 
* string cmdstr = "";                                          * 
*                                                              * 
* if (args.Length > 0)                                         * 
*                                                              * 
* {                                                            * 
*                                                              * 
* cmdstr = args[0];                                            * 
*                                                              * 
* }                                                            * 
*                                                              * 
* TestODBCDB2(cmdstr);                                         * 
*                                                              * 
* }                                                            * 
*                                                              * 
*                                                              * 
*                                                              * 
* static void TestODBCDB2(String cmdstr)                       * 
*                                                              * 
* {                                                            * 
*                                                              * 
* // create and open a new connection                          * 
*                                                              * 
* try                                                          * 
*                                                              * 
* {                                                            * 
*                                                              * 
* // open the connection                                       * 
*                                                              * 
* Console.WriteLine("Openning                                  * 
* connection....");                                            * 
* String connStr =                                             * 
*                                                              * 
* "DSN=SAMPLE;UID=UserID;PWD=password;DATABASE=SAMPLE;WSID=serv 
*                                                              * 
* erName";                                                     * 
*                                                              * 
* OdbcConnection Conn = new                                    * 
*                                                              * 
* OdbcConnection(connStr);                                     * 
*                                                              * 
* Conn.Open();                                                 * 
*                                                              * 
* OdbcCommand command = new OdbcCommand("call                  * 
*                                                              * 
* TEST_STORED_PROC ('Param1',0);");                            * 
*                                                              * 
* command.Connection = Conn;                                   * 
*                                                              * 
* OdbcDataReader reader =                                      * 
*                                                              * 
* command.ExecuteReader(System.Data.CommandBehavior.SequentialAc 
* ss);                                                         * 
*                                                              * 
* Console.WriteLine("printing result");                        * 
*                                                              * 
* while (reader.Read())                                        * 
*                                                              * 
* {                                                            * 
*                                                              * 
* for (int i = 0; i < reader.FieldCount;                       * 
* i++)                                                         * 
* {                                                            * 
*                                                              * 
* Console.Write(reader.GetValue(i));                           * 
*                                                              * 
* Console.Write("\t");                                         * 
*                                                              * 
* }                                                            * 
*                                                              * 
* Console.WriteLine("");                                       * 
*                                                              * 
* }                                                            * 
*                                                              * 
* command.Dispose();                                           * 
*                                                              * 
* Console.WriteLine("done");                                   * 
*                                                              * 
* }                                                            * 
*                                                              * 
*                                                              * 
*                                                              * 
* catch (Exception e)                                          * 
*                                                              * 
* {                                                            * 
*                                                              * 
* Console.WriteLine(e.ToString());                             * 
*                                                              * 
* Console.WriteLine(e.StackTrace);                             * 
*                                                              * 
* }                                                            * 
*                                                              * 
* }                                                            * 
*                                                              * 
* }                                                            * 
*                                                              * 
* }                                                            * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 V9.5 Fix Pack 7 or follow the suggested       * 
* circumvention                                                * 
****************************************************************
Local Fix:
Do not use the Executereader method.  Prepare and execute the 
SQL statement that calls a stored procedure separately.
available fix packs:
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem was first fixed in Version 9.5 Fix Pack 7
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
29.06.2010
19.10.2010
19.10.2010
Problem solved at the following versions (IBM BugInfos)
9.5.FP7
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.7 FixList
9.5.0.7 FixList
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