Microsoft KB Archive/922674

Knowledge Base

FIX: The OracleDataReader.GetChars method may return the incorrect data in the .NET Framework 2.0

Article ID: 922674

Article Last Modified on 12/3/2007

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APPLIES TO

• Microsoft .NET Framework 2.0

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SYMPTOMS

In the Microsoft .NET Framework 2.0, the OracleDataReader.GetChars method may return the incorrect data the second time that you read data from the OracleDataReader object. After the second time that you call the OracleDataReader.Read method, the OracleDataReader.GetChars method may return the data from the first row.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next .NET Framework 2.0 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

File name	File version	File size	Date	Time
Mscordacwks.dll	2.0.50727.178	801,280	08-Jul-2006	11:28
Mscorlib.dll	2.0.50727.178	4,317,184	08-Jul-2006	11:28
Mscorwks.dll	2.0.50727.178	5,624,320	08-Jul-2006	11:27
Normalization.dll	2.0.50727.178	15,360	08-Jul-2006	11:28
Normidna.nlp	Not Applicable	59,342	08-Jul-2006	11:28
Normnfc.nlp	Not Applicable	45,794	08-Jul-2006	11:28
Normnfd.nlp	Not Applicable	39,284	08-Jul-2006	11:28
Normnfkc.nlp	Not Applicable	66,384	08-Jul-2006	11:28
Normnfkd.nlp	Not Applicable	60,294	08-Jul-2006	11:28
Sos.dll	2.0.50727.178	377,344	08-Jul-2006	11:28
System.data.dll	2.0.50727.178	2,893,824	08-Jul-2006	11:28
System.data.oracleclient.dll	2.0.50727.178	482,304	08-Jul-2006	11:28

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information about the OracleDataReader.GetChars method, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn2.microsoft.com/en-us/library/system.data.oracleclient.oracledatareader.getchars(VS.80).aspx

Steps to reproduce the problem

1. Start Microsoft Visual Studio 2005.
2. On the File menu, click New, and then click Project.
3. Click Visual C#, click Console Application, type ConsoleApplication1 in the Name box, and then click OK.

4. In the Program.cs file, replace the existing code by using the following code.

   using System;
   using System.Text;
   using System.Data;
   using System.Data.OracleClient;
   
   namespace ConsoleApplication1
   {
       class Program
       {
           private static void Main()
           {
               OracleConnection cn = new OracleConnection("Data Source=<DataSourceName>;uid=<UserName>;pwd=<Password>;");
               cn.Open();
   
               DropTable(cn);
               CreateTable(cn);
   
               OracleCommand command = cn.CreateCommand();
               command.CommandText = "SELECT DATA FROM TEST_GETCHARS ORDER BY DATA DESC";
               OracleDataReader reader = command.ExecuteReader();
               while (reader.Read())
               {
                   string getStringText = reader.GetString(0);
                   char[] chs = new char[40];
                   long count = reader.GetChars(0, 0, chs, 0, 40);
                   String s = new String(chs);
                   Console.WriteLine("String from GetString: {2}, String from GetChars: {0}, Character count: {1}", s, count.ToString(), getStringText);
               }
   
               cn.Close();
               cn = null;
           }
   
           private static void CreateTable(IDbConnection connection)
           {
               IDbCommand command = connection.CreateCommand();
               command.CommandText = "CREATE TABLE TEST_GETCHARS (DATA varchar(40))";
               command.ExecuteNonQuery();
   
               command.CommandText = "INSERT INTO TEST_GETCHARS (DATA) VALUES('yes')";
               command.ExecuteNonQuery();
   
               command.CommandText = "INSERT INTO TEST_GETCHARS (DATA) VALUES('no')";
               for (int i = 0; i < 2000; i++)
               command.ExecuteNonQuery();
   
           }
   
           private static void DropTable(IDbConnection connection)
           {
               try
               {
                   IDbCommand command = connection.CreateCommand();
                   command.CommandText = "DROP TABLE TEST_GETCHARS";
                   command.ExecuteNonQuery();
               }
               catch (Exception)
               {
               }
           }
       }
   }

5. In Solution Explorer, right-click References, and then click Add Reference.
6. Click the .NET tab, click System.Data.OracleClient, and then click OK.
7. On the Debug menu, click Start Debugging.

Additional query words: OracleDataReader GetChars

Keywords: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver KB922674

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