libgdamm
4.99.7
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Blobs handling. More...
Public Member Functions | |
virtual | ~BlobOp () |
GdaBlobOp* | gobj () |
Provides access to the underlying C GObject. More... | |
const GdaBlobOp* | gobj () const |
Provides access to the underlying C GObject. More... | |
GdaBlobOp* | gobj_copy () |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More... | |
long | get_length () const |
long | read (Blob& blob, long offset, long size) |
Reads a chunk of bytes from the BLOB accessible through op into blob. More... | |
long | write (Blob& blob, long offset) |
Writes a chunk of bytes from a blob to the BLOB accessible through op, blob is unchanged after this call. More... | |
bool | read_all (Blob& blob) |
Reads the whole contents of the blob manipulated by op into blob. More... | |
bool | write_all (Blob& blob) |
Writes the whole contents of blob into the blob manipulated by op. More... | |
Static Public Member Functions | |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. More... | |
static Glib::RefPtr< BlobOp > | create () |
Protected Member Functions | |
BlobOp () | |
Related Functions | |
(Note that these are not member functions.) | |
Glib::RefPtr< Gnome::Gda::BlobOp > | wrap (GdaBlobOp* object, bool take_copy=false) |
A Glib::wrap() method for this object. More... | |
Blobs handling.
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.
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virtual |
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protected |
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static |
long Gnome::Gda::BlobOp::get_length | ( | ) | const |
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static |
Get the GType for this class, for use with the underlying GObject type system.
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inline |
Provides access to the underlying C GObject.
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inline |
Provides access to the underlying C GObject.
GdaBlobOp* Gnome::Gda::BlobOp::gobj_copy | ( | ) |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
long Gnome::Gda::BlobOp::read | ( | Blob& | blob, |
long | offset, | ||
long | size | ||
) |
Reads a chunk of bytes from the BLOB accessible through op into blob.
blob | A Gda::Blob to read data to. |
offset | Offset to read from the start of the blob (starts at 0). |
size | Maximum number of bytes to read. |
bool Gnome::Gda::BlobOp::read_all | ( | Blob& | blob | ) |
Reads the whole contents of the blob manipulated by op into blob.
blob | A Gda::Blob to read data to. |
true
if blob->data contains the whole BLOB manipulated by op. long Gnome::Gda::BlobOp::write | ( | Blob& | blob, |
long | offset | ||
) |
Writes a chunk of bytes from a blob to the BLOB accessible through op, blob is unchanged after this call.
If blob has an associated Gda::BlobOp (ie. if blob->op is not 0
) then the data to be written using op is the data fetched using blob->op.
blob | A Gda::Blob which contains the data to write. |
offset | Offset to write from the start of the blob (starts at 0). |
bool Gnome::Gda::BlobOp::write_all | ( | Blob& | blob | ) |
Writes the whole contents of blob into the blob manipulated by op.
If necessary the resulting blob is truncated from its previous length.
blob | A Gda::Blob which contains the data to write. |
true
on success.
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related |
A Glib::wrap() method for this object.
object | The C instance. |
take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref. |