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With Accpac 6.0A we are upgrading to Crystal Reports 2008 and will use the. Originally this API was used to talk to CA-RET the Computer Associates Reporting tools, then it was converted to talk to Crystal’s crpe32.dll interface, later to Crystal COM’s interface. We provide an Accpac reporting API which then handles the details of talking to Crystal. We just point Crystal at the correct database and provide the necessary connection information and then let Crystal do the rest. From Accpac the same Crystal Report is used for Pervasive.SQL, Oracle and SQL Server. We use Crystal Reports as our reporting engine and then Crystal provides the mechanisms to have database independent reports.

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Such as read all records where the description starts with A, or update all records changing any with customer number 1200 to 1400, or delete all records with status “deleted”. The set oriented API calls operate on a set of records at a time. The meta-data calls return information about the structure of the database, things like get a list of all the tables in the database, get information on all the fields in a table.

The record based APIs operate on one record at a time, such as read a record based on a supplied key, update that record. The Accpac database API includes a number of record oriented API calls, a number of meta-data calls and a number of set based operations. If a new version of a database server is released and Accpac needs to be updated to support it, then its just a matter of providing a new database driver, without requiring any other application changes. Then all the differences in the databases are isolated to the Accpac database driver. The application programmer creating our business logic objects, just needs to know our Accpac database API to do his job. The key point is that all this detail is invisible to the Business Logic. For Pervasive we communicate with both the relational layer using SQL calls, and with the transactional layer making direct Pervasive API calls.

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Our SQL Server driver uses ODBC to communicate with the SQL Sever Native driver. How the database driver accomplishes this is entirely up to the driver.

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Then we have database drivers that translate this API into calls to the database server currently being used. Our business logic objects (the real core of our Accounting Applications) communicate with the database via a common database API. We currently have a very robust and scalable solution.Īccpac is a three tier application with the business logic separated from the database. Many third party tools integrate with Accpac through open database interfaces. We can easily move Accpac data from one database to another via our Database Dump and Load utilities.Īlong the way we’ve evolved our API and easily moved from database version to database version. Later we added support for IBM DB2 and Oracle Databases. We decided to base our new database support on transactions and to define a set of requirements that a database would need to support to work with Accpac.ĬA-Accpac/2000 originally shipped supporting Btrieve 6.15, and then with version 2.5A we added support for Microsoft SQL Server 6.

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So when Accpac for Windows was developed, we made the decision to use standard off-the-shelf databases.

It didn’t support SQL and hence didn’t fully support ODBC or any other standard interface mechanism making it hard to use external tools like for reporting.

It didn’t have a server version, so relied on file system locks which were hard to support for all the different network operating system.

It used record locking as its multi-user model, so once too many people were doing things, too many records would be locked and things would grind to a halt.

It didn’t support database transactions so if something failed the database was left corrupted.

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This was a simple ISAM based package that was fast and easy to install and configure.

When this product was developed there weren’t standard off the shelf packages to use. This blog posting is going to talk a bit about how Accpac Accounting applications access the database, give some rationale for the way we do things and look at where we may go in the future.Īccpac Plus, the original character based product for first CP/M ( ) and then MS-DOS ( ) used a proprietary built-in database. Sage ERP Accpac supports running using either Pervasive.SQL ( ), Microsoft SQL Server ( ) or Oracle ( ) Database Servers.