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GNOME Data Access 3.0 manual | ![]() |
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GdaBlobOp; glong gda_blob_op_get_length (GdaBlobOp *op); glong gda_blob_op_read (GdaBlobOp *op, GdaBlob *blob, glong offset, glong size); gboolean gda_blob_op_read_all (GdaBlobOp *op, GdaBlob *blob); glong gda_blob_op_write (GdaBlobOp *op, GdaBlob *blob, glong offset); gboolean gda_blob_op_write_all (GdaBlobOp *op, GdaBlob *blob);
This object is a base class for individual database providers which support BLOB types. It supports operations to read and write data in a BLOB.
glong gda_blob_op_get_length (GdaBlobOp *op);
Opens an existing BLOB. The BLOB must be initialized by
gda_connection_create_blob or obtained from a GValue.
FIXME: gda_connection_create_blob()
no longer exists.
|
an existing GdaBlobOp |
Returns : |
the length of the blob in bytes. In case of error, -1 is returned and the provider should have added an error (a GdaConnectionEvent) to the connection. |
glong gda_blob_op_read (GdaBlobOp *op, GdaBlob *blob, glong offset, glong size);
Reads a chunk of bytes from the BLOB into blob
.
gboolean gda_blob_op_read_all (GdaBlobOp *op, GdaBlob *blob);
Reads the whole contents of the blob manipulated by op
into blob
glong gda_blob_op_write (GdaBlobOp *op, GdaBlob *blob, glong offset);
Writes a chunk of bytes from a blob
to the BLOB accessible through op
.