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FIX: REPAIR_DB Option May Remove Encryption from Access 2000 Database


View products that this article applies to.

This article was previously published under Q298145

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Symptoms

If you use the SQLConfigDataSource ODBC API call with the REPAIR_DB option on an encrypted Microsoft Access database file, the database is properly repaired, but the encryption is removed.

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Cause

This is a problem in the Microsoft Jet ODBC Drivers (Odbcjt32.dll) that ship with Microsoft Data Access Components (MDAC) 2.5 Service Pack 2 and earlier.

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Resolution

To resolve this problem, obtain the latest service pack for Microsoft MDAC 2.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
293312� INFO: How to Obtain the Latest MDAC 2.5 Service Pack
The English version of this fix should have the following file attributes or later:
   Date        Version      Size            File name      Platform
   ----------------------------------------------------------------
   12/04/2001  4.0.7412.0   270,608 bytes   Odbcjt32.dll   x86
				

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Workaround

To work around this problem, use the CDaoWorkspace::RepairDatabase function to repair the database.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft MDAC 2.5 Service Pack 3.

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More information

The following code reproduces the problem:
void Repair(BOOL bEncrypt)
{
	CString strDBQ = "d:\\NWind.mdb", strSystemDB = "d:\\System.mdw";
	CString strAttributes;
	strAttributes += "REPAIR_DB=";
	strAttributes += strDBQ;
	if (bEncrypt)
		strAttributes += " ENCRYPT";  // This additional keyword is an optimistic try and has no effect!!
	strAttributes += "|";
	strAttributes += "SYSTEMDB=";
	strAttributes += strSystemDB;
	strAttributes += "|";
	strAttributes += "EXCLUSIVE=TRUE";
	strAttributes += "|";
	strAttributes += "|";

	// Exchange pipes against nulls so the command is interpreted correctly.
	for (int i = 0; i < strAttributes.GetLength(); i++)
	{
		if (strAttributes[i] == '|')
			strAttributes.SetAt(i, char(0));
	}

	BOOL b = SQLConfigDataSource(NULL, ODBC_CONFIG_SYS_DSN, "Microsoft Access Driver (*.mdb)",
		(LPCSTR) strAttributes);
	if (!b)
	{
		CString strErrorMsg;
		for (int i = 1; i <= 8; i++)
		{
			WORD cbErrorMsg;
			DWORD dwErrorCode;
			RETCODE r = SQLInstallerError(i, &dwErrorCode, strErrorMsg.GetBuffer(100), 100, &cbErrorMsg);
			if (r == SQL_NO_DATA)
				break;
			strErrorMsg.ReleaseBuffer(cbErrorMsg);
			TRACE("Rec: %d: %d, %x (%s)\n", i, r, dwErrorCode, (const char *) strErrorMsg);
		}

		AfxMessageBox("Repair failed!");
	}
	else
		AfxMessageBox("Repair succeeded!");
}
				

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Keywords: kbhotfixserver, kbqfe, kbmdac250sp3fix, kbjet, kbmdacnosweep, kbprb, KB298145

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Article Info
Article ID : 298145
Revision : 5
Created on : 9/26/2005
Published on : 9/26/2005
Exists online : False
Views : 160