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GNOME Data Access 4.0 manual | ![]() |
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Blobs are a special feature of databases because they allow one to access the contents of a "cell" from the API without using SQL (usually no SQL can be used to manipulate a blob's contents: an SQL statement is used to create, delete or retreive a blob, but the contents is accessed through the API).
libgda encapsulates all blob operations in objects which must be implemented by each provider if they want to support blobs; otherwise binary data may still be used if supported by the database, but the whole binary data is transfered in the SQL statement which is not suitable for large data.