So I need DDFs other than the INDEX, FILE and FIELD ones?
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How to open .BTR format tables with Pervasive.SQL 2000i
I am completely new to databases beyond Microsoft Access. Learning how to use SQL is still a project for when I have time in the future. :|
I have a database, containing quite a few tables, all in .BTR format. I can get Pervasive.SQL 2000i to access the database, and the FIELD, File and INDEX .DDF's show up fine, but no tables.
Looking at DEMODATA, the tables are all in .MKD format. Will Pervasive.SQL 2000i open .BTR files?
I’ve tried to read all the documentation I could find on the Pervasive website, but I couldn't find anything about tables of different file formats. All the coding went straight over my head. I’ve spent all of last Friday and today look for information (mostly on this excellent site) without luck, as most people seem to have problems with connecting to databases, not the actual databases themselves.
I’ve found how to use the export wizard, but as the tables don't show up in the list, I can’t do anything with it. :(
Any help appreciated.
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Answers
No. You should have a least FILE.DDF, FIELD.DDF, and INDEX.DDF. You may have others but those three are the minimum. You can't however just drop in any copy those three files. You must use a matched set and they must describe your data files. For example, you can't take the DDFs in the Pervasive Demodata directory and drop them into your data directory.
Have you contacted the vendor for DDFs?
I have found the solution. In the File.ddf file, the tables have full filenames, copying the database to a directory with the correct filename solves the problem.
However, when opening some of the tables, I get the following "ODBC error": "ODBC Error: SQLSTATE = 22005, Native error code = 0, Error in assignment". A google search doesn't bring up much. Any help with this one?
Sorry for my ignorance relating to the first problem.
For those tables you received the "error in assignment error", I may have a solution for you.
I had the exact same error earlier today, but I've found that when creating a new table and using existing data from a btr file, one column not only was too large (over 254 characters), but the data type was "unknown". After truncating the column to a valid # of characters I still received the same error.
Once deleting this lone column, I finally was able to access the table & all the rest of the existing columns of data.
To remove a column, right click on the table in Control Center and choose Tasks>Edit Table Design. Check the size & type to ensure that they are indeed valid. You should be able to do this even if you cannot access its data.
According to the following link, this error was fixed in Pervasive 2000i sp4:
http://www.dbforums.com/sh
This other link goes through some troubleshooting with regards to the error:
http://www.talkaboutdataba
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by: mirtheilPosted on 2004-07-27 at 10:40:09ID: 11648900
In order to use ODBC (used by the PCC in 2000i and later), you need DDFs. The fact that your database is empty tells me that you didn't have DDFs. Contact the vendor for DDFs for your tables. Copy them into the data directory and try again.
To answer you question though, yes Pervasive.SQL 2000i can read and write BTR files (or any Btrieve/Pervasive data files). The extension doesn't matter as long as it's consistent between the DDF definition and the file name. For example, I've used MGC, DRT, BRT, and a few others.