This can be demonstrated via the B_CREATE operation, which permits a developer to create a new datafile with an arbitrary byte buffer, and the B_CREATE_INDEX operation which only cares about offsets within that buffer. If you're looking for something production-ready, check out BTR2SQL from Mertech Overview of StructuresĪt the end of the day, Btrieve only really cared about data in terms of type, offset, and length.
#Pervasive postgres code#
Note: I've only tried this with Postgres and this code should never be used for anything other than as a proof-of-concept. The basic idea behind this was to wrap ODBC-based calls behind the Btrieve API and translate the operations to relevant SQL queries so that any backend database could be used. Unforunately, the more full-featured one I did seems to have gotten lost in what I not-so-fondly refer to as The Great Oracle Internals Data Loss Incident of 2009. The proof-of-concept, found here, has been updated to use a number of current libraries. I figured I could do better and that it would be a fun day-long exercise. The example application, however, was a mess and required a ton of custom behind-the-scenes app-specific development simulating the Btrieve API. At the time, the only example for such a thing was a technical publication from Microsoft on migrating from Btrieve to ODBC.
A couple years later, I ran across a forum entry where the author wanted to do a migration of their application from Btrieve to PostgreSQL without any source-level changes. Based on that knowledge and having had experience writing drop-in replacement libraries for PostgreSQL, MySQL, and the Oracle Call Interface, I decided to build a simple prototype compatible with the Microsoft Jet API a library enabling the substitution of Microsoft's Extensible Storage Engine with PostgreSQL. Writing to the file directly is a great improvement.A long time ago, I developed a C library which provided an ISAM-based interface to SQL databases. Love the product! Y'all have done an amazing job! An other great thing to consider is that SQL scripts can also constitute a backup file of your database. With SQL Script Builder once you have established your source ODBC connection and generated the script, you can be sure this script will work on the destination database because the scripts are universal. There's may be others tools that can migrate your database, without the use of SQL language, but these may not establish a successful connection between databases because of versions compatibility. ODBC is a universal interface, almost every database provider support it.
#Pervasive postgres driver#
There's no limits, all you need is the ODBC driver for the database you wish to migrate from.
You don't have to migrate all database, you can if you wish only migrate one table at a time. SQL Script Builder can be used for example for database migration from your Access database to MySql database, or MySql database migration to MS SQL database and vice versa. SQL Script Builder scripts can be used on your DBMS ( database management system) or uploaded on a server. SQL Script Builder is very simple to use, you just have to choose the database and the table from the list. Scripts are available in 5 output formats MySql, MS SQL, Oracle, Pervasive and PostgreSQL , and files comes in Access mdb, Excel csv, MS xml. The script produced will migrate the database (multiple tables selection) or only one table and the records.
#Pervasive postgres software#
Ever wanted a tool that can migrate any database? SQL Script Builder is powerful free software that can create a database migration sql script (or dump file) or database files from any ODBC supported database.
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