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Q169825: FIX: Upsizing Multiple Memo Fields to Oracle May Cause Data Loss

Article: Q169825
Product(s): Microsoft FoxPro
Version(s): 5.0 5.0a
Operating System(s): 
Keyword(s): kbvfp kbvfp600fix
Last Modified: 24-MAR-2000

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The information in this article applies to:

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

After upsizing a table with multiple memo fields to an Oracle server, the
upsized data may be invalid or corrupt.

RESOLUTION
==========

To prevent this problem, in Step 3 of the Upsizing wizard, leave one of the memo
fields as type Long.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This has been corrected in Visual FoxPro 6.0.

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

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

There are three parts in setting up this example: Part 1 is to create a small
table with multiple memo fields to be used in the Upsizing wizard. Part 2 is to
upsize the data to an Oracle server. Part 3 is to create a remote view of the
Oracle data to observe the results.

Part 1: Create a Table with Empty General Field Records
-------------------------------------------------------

Save the following code to a file called Creatabl.prg:

     *** Begin code ***
     CLOSE ALL
     CREATE DATABASE test
     CREATE TABLE mymemos (mfield1 M, mfield2 M)
     INSERT INTO mymemos (mfield1,mfield2) VALUES ('mf1data1','mf2data1')
     INSERT INTO mymemos (mfield1,mfield2) VALUES ('mf1data2','mf2data2')
     INSERT INTO mymemos (mfield1,mfield2) VALUES ('mf1data3','mf2data3')
     *** End code ***

Part 2: Upsize the Data to an Oracle Server
-------------------------------------------

1. From the Visual FoxPro Tools menu, select Wizards and click Upsizing.

2. In the Wizard Selection dialog box, click the Oracle Upsizing Wizard, and
  click OK.

3. In Step 1, select the Test database, and click Next.

4. In Step 2, select the Oracle data source to upsize to, and click Next.

  NOTE: At this point, a login screen may come up. Login to the Oracle data
  source to continue.

5. In Step 3, move the Mymemos table to the Selected Tables pane, and click
  Next.

  NOTE: At this point, a message box appears stating that the table has more
  than one memo or general field. Furthermore, these fields will be mapped to a
  fixed-length data type.

6. In Step 4, change the Server Type of Mfield1 from Long to varchar2, and click
  Next to continue.

7. In Step 5, select the Oracle tablespace to upsize the data to (this could be
  an existing or new tablespace). Then, click Next.

8. In Step 6, set the appropriate tablespace file, and click Next.

9. In Step 7, specify the cluster information, and click OK.

  NOTE: In Steps 8 and 9 the Specify Cluster tables and Specify Cluster Key
  field, respectively, may or may not be skipped depending on specific
  configuration.

10. In Step 8, set the upsizing options. In this test, all of the check boxes
  can be cleared. Then, click Next.

11. In Step 11, click Finish to upsize the data to the Oracle server.

Part 3: Create a Remote View of the Upsized-Oracle Data
-------------------------------------------------------

1. Open the Test database if it's not already open by entering the following
  command in the Visual FoxPro Command window:

        OPEN DATABASE test

2. From the Visual FoxPro File menu, select New, and click Remote View. Click
  the New File button.

3. In the Select Connection or Data Source dialog box, select the appropriate
  datasource and click OK.

  NOTE: At this point, a login screen may come up. Login into the SQL data
  source to continue.

4. In the Open dialog box, select the upsized table to open, and click Add.

5. In the View Designer dialog box, move both memo fields to the Selected Fields
  pane.

6. Run the query to bring up a Browse window.

NOTE: When viewing the data in any of the records, the original data will be
replaced by zeros or other incorrect data.

Additional query words:

======================================================================
Keywords          : kbvfp kbvfp600fix 
Technology        : kbVFPsearch kbAudDeveloper kbVFP500 kbVFP500a
Version           : 5.0 5.0a
Issue type        : kbbug kbprb
Solution Type     : kbfix

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