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04.01.2008 at 02:07PM PDT, ID: 23287293
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How to map Btrieve variable length field to SQL LONGVARCHAR field type

Tags: Pervasive, Btrieve, SQL, C++, Pervasive SQL
I have several Btrieve files used by C++ applications in transactional mode. Now I need to access the same Btrieve files using Pervasive SQL. I have created the appropriate tables using IN DICTIONARY option which means that only dictionary specifications are created and data left as it is. Now I can access the same data using transactional and relational database engines.

Hovewer, a problem has occured with variable length fields. Btrieve (ver 9) allows one variable length field at the end of the record. The manual says variable fields should be mapped to SQL as LONGVARCHAR type. When I used this method I got a corrupted view of the data. Any SQL access returns error 103 (The chunk offset is too big) or (ODBC) Currency not on record, etc.

The documentation also says that a new type was introduced recently - CLOB - and it maps good with LONGVARCHAR. But  my Btrieve files are older and are not using it. Should I modify them? I prefer not to, since there are many programs involved that are now accessing them.

I would appreciate your help, thank you.
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Question Stats
Zone: Database
Question Asked By: igams
Solution Provided By: BillBach
Participating Experts: 1
Solution Grade: A
Views: 20
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04.01.2008 at 03:22PM PDT, ID: 21258663

Rank: Master

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04.03.2008 at 01:05PM PDT, ID: 21276405

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04.01.2008 at 03:22PM PDT, ID: 21258663

Rank: Master

You are probably using the older NOTE style of fields, which worked perfectly well in PSQL7 and earlier, but for which the newer SQL engine (starting with PSQL2000i) has been sorely lacking support.

What EXACT version of the engine are you using today?  If you have v9.52.025 or newer, then you can leverage a new function to do this:

Pervasive has recently updated the SQL engine and added support for the legacy datatypes.  This functionality is intended to be used to correct/modify existing table definitions for legacy Btrieve files, it is not designed to create new tables with legacy types.   To use this, you must first SET TRUENULLCREATE = OFF.  So, for example, you can execute the following:
      set truenullcreate = off#
      create table tu in dictionary using 'tu.mkd' ( c1 lstring(10), c2 zstring(10), c3 note(200) )#

The types LSTRING, ZSTRING, LVAR, NOTE, LOGICAL, LOGICAL2 (two-byte) are all supported.  The IN DICTIONARY clause is required on any CREATE or ALTER TABLE statement using these types.

If you do not have v9.5 yet, then first get the PSQLv9.5 Service Pack.  Then, apply the "Update 1" update, which should get you to 9.52.053 or higher, which will be able to use this new feature.
Accepted Solution
 
04.03.2008 at 01:05PM PDT, ID: 21276405
Thanks for your response, BillBach.

You are right, I upgraded to current version 9.52.056 and it really works!

It also works in version 10. But it still remains an undocumented feature - the reserved word 'NOTE' is not marked as such in Pervasive Control Centre as others are, and the documentation explicitely says:
"This feature does not affect existing tables or available column data types. All tables are created using Pervasive PSQL data types. For example, old data types such as NOTE or LVAR are not available for
use regardless of which type of NULL support is selected. (SQL Engine Reference, page 3-259.)"

Thanks again!

 
 
04.03.2008 at 01:21PM PDT, ID: 21276558
A lot of people don't need this type of feature, but I do hope they document it eventually.
 
 
 
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