ASE ODBC Driver and OLE DB Provider Migration Technical - Sybase

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Please note the following about this diagram: First, multiple drivers and data sources can exist, which allows the
application to access data from more than one data source simultaneously. Second, the ODBC API is used in two
places: Between the application and the Driver Manager, and between the Driver Manager and each driver. The
interface between the Driver Manager and the drivers is sometimes referred to as the service provider interface, or SPI.
For ODBC, the application programming interface (API) and the service provider interface (SPI) are the same; that is,
the Driver Manager and each driver have the same interface to the same functions.
3 OveRview Of OLe dB
Today, a vast amount of the critical information necessary for conducting day-to-day business is found outside of
traditional, corporate production databases. Instead, this information is found in file systems, in indexed-sequential
files such as Btrieve, and in personal databases such as Microsoft® Access and Microsoft Visual FoxPro®; it’s also found
in productivity tools such as spreadsheets, project management planners, and electronic mail; finally, more and more
frequently, it’s found on the World Wide Web.
To take advantage of the benefits of database technology, such as declarative queries, transactions, and security,
businesses have traditionally had to move the data from its original containing system into some type of database
management system (DBMS). This process is expensive and redundant. Furthermore, businesses need to be able to
exploit the advantages of database technology not only when accessing data within a DBMS but also when accessing
data from any other type of information container. To address this need, Microsoft created OLE DB.
OLE DB is a set of Component Object Model (COM) interfaces that provide applications with uniform access to data
stored in diverse information sources and that also provide the ability to implement additional database services.
These interfaces support the amount of DBMS functionality appropriate to the data store, enabling it to share its data.
4 MigRatiOn OveRview
To migrate your applications from the third-party ODBC driver and OLE DB provider to Sybase’s ODBC driver and
OLE DB provider, it is important to understand the structure of your environment. The following diagram illustrates an
ODBC application that connects to Adaptive Server Enterprise. At the core of the ODBC application is the ODBC driver,
which facilitates connectivity to ASE.
To migrate from a third-party ODBC driver to the Sybase ODBC driver,
1. Replace the third-party driver with the Sybase ODBC driver.
2. Change the data source definitions (DSN) using the migration tool.
Your application should function with no additional changes.
To migrate from a third-party OLE DB provider to the Sybase OLE DB provider,
1. Replace it with the Sybase OLE DB provider.
2. Use the migration tool to transform existing third party data sources to the Sybase OLE DB provider format.
Your application should function with no additional changes.