Filter Types

From InterBase

Go Up to Writing an External Blob Filter (Embedded SQL Guide)

Filters can be divided into two types: filters that convert data one segment at a time, and filters that convert data many segments at a time.

The first type of filter reads a segment of data, converts it, and supplies it to the application a segment at a time.

The second type of filter might read all the data and do all the conversion when the Blob read cursor is first opened, and then simulate supplying data a segment at a time to the application.

If timing is an issue for your application, you should carefully consider these two types of filters and which might better serve your purpose.

Advance To: