Q263914: PRB: CREATEOFFLINE() Can Result in No Records

Article: Q263914
Product(s): Microsoft FoxPro
Version(s): WINDOWS:5.0,5.0a,6.0
Operating System(s): 
Keyword(s): KbClientServer kbDatabase kbSQL kbvfp500 kbvfp500a KbDBFDBC kbGrpDSFox kbDSupport kbCod
Last Modified: 27-JUL-2001

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 5.0, 5.0a, 6.0 
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SYMPTOMS
========

After performing a CREATEOFFLINE() function on a remote view, the resulting
table (.dbf) file record count is zero (0) while its file size indicates that it
should contain data.

RESOLUTION
==========

As a workaround, use the file size to calculate the number of expected records
and modify the table header through low-level file input/output (I/O) to reflect
that number. For additional information on this workaround, see the "References"
section later in this article.

MORE INFORMATION
================

This problem occurs when the data that is pulled by the remote view is in excess
of 50 Megabytes in size and the offline view is created on a less capable
computer than is needed.

NOTE: This problem may not be immediately reproducible.

Environment Specifics for Reproduction
--------------------------------------

- Pentium processor, 120 MHz clock speed

- 64 Megabytes of RAM

Steps to Reproduce Behavior
---------------------------

1. Create a new folder to contain this reproduction. For this example, call it
  C:\OFFLINE.

2. Open the customer.dbf file that ships with Visual FoxPro, and copy it to the
  reproduction folder as follows:

  COPY TO c:\offline\customer

3. Place the following code into a program in your reproduction folder called
  c:\offline\testprog.prg:

  *!* Beginning of TESTPROG.PRG
  USE CUSTOMER EXCLUSIVE
  ALTER TABLE customer ADD COLUMN field1 c(10) NULL ;
  	ADD COLUMN field2 c(10) NULL ;
  	ADD COLUMN field3 c(10) NULL
  lcRepString = "XXXXXXXXXX"
  REPLACE ALL field1 WITH lcRepString, ;
  	field2 WITH lcRepString, ;
  	field3 WITH lcRepString
  SET SAFETY OFF
  COPY TO tempcust
  FOR iCopy = 1 TO 2288
  	APPEND FROM tempcust
  ENDFOR
  SET SAFETY ON
  ERASE tempcust.dbf
  *!* Based on an initial record count of 92, the
  *!* resulting table will contain 210,588 records
  *!* and the file size will be 65,072,501 bytes.

4. Set your Visual FoxPro default folder to your reproduction folder as follows:

  CD c:\offline

5. Run the testprog.prg as follows:

  DO testprog

Once the preceding test program (or similar) is established, perform the
following:

6. Place the following code into a program in your reproduction folder called
  c:\offline\testconn.prg:

  *!*Beginning of TESTCONN.PRG
  CLEAR ALL
  CLOSE ALL
  RELEASE ALL
  CLOSE DATA ALL
  CREATE DATABASE testoffline
  CREATE CONNECTION connect1 CONNSTRING ;
     'DRIVER={Microsoft Visual FoxPro Driver};' + ;
     'Exclusive=Yes;SourceType=DBF;SourceDB='c:\offline\'
  CREATE SQL VIEW remote_customer ;
        AS SELECT * ;
        FROM customer
  =CREATEOFFLINE('remote_customer')
  CLOSE DATA ALL
  DIR remote_customer.dbf

7. Run the testconn.prg by using the following code:

  DO testconn

8. If this process reproduces the problem, note that a file size of 65,072,501
  bytes and 0 records appears.

REFERENCES
==========

For additional information, click the article number below to view the article
in the Microsoft Knowledge Base:

  Q263902 Table/dbf File Record Count Incorrect Based on File Size

Additional query words:

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Keywords          : KbClientServer kbDatabase kbSQL kbvfp500 kbvfp500a KbDBFDBC kbGrpDSFox kbDSupport kbCodeSnippet kbSQLProg 
Technology        : kbVFPsearch kbAudDeveloper kbVFP500 kbVFP600 kbVFP500a
Version           : WINDOWS:5.0,5.0a,6.0
Issue type        : kbprb

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