This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Open a :class:`Blob` handle to the :abbr:`BLOB (Binary Large OBject)`
located in row *row*, column *column*, table *table* of database *name*.
located in table name *table*, column name *column*, and row index *row*
of database *name*.
When *readonly* is :const:`True` the blob is opened without write
permissions.
Trying to open a blob in a ``WITHOUT ROWID`` table will raise
:exc:`OperationalError`.
.. note::
Expand Down
Expand Up
@@ -1044,6 +1047,57 @@ Now we plug :class:`Row` in::
35.14
Blob Objects
------------
.. versionadded:: 3.11
.. class:: Blob
A :class:`Blob` instance is a :term:`file-like object` that can read and write
data in an SQLite :abbr:`BLOB (Binary Large OBject)`. Call ``len(blob)`` to
get the size (number of bytes) of the blob.
Use the :class:`Blob` as a :term:`context manager` to ensure that the blob
handle is closed after use.
.. literalinclude:: ../includes/sqlite3/blob.py
.. method:: close()
Close the blob.
The blob will be unusable from this point onward. An
:class:`~sqlite3.Error` (or subclass) exception will be raised if any
further operation is attempted with the blob.
.. method:: read(length=-1, /)
Read *length* bytes of data from the blob at the current offset position.
If the end of the blob is reached, the data up to
:abbr:`EOF (End of File)` will be returned. When *length* is not
specified, or is negative, :meth:`~Blob.read` will read until the end of
the blob.
.. method:: write(data, /)
Write *data* to the blob at the current offset. This function cannot
change the blob length. Writing beyond the end of the blob will raise
:exc:`ValueError`.
.. method:: tell()
Return the current access position of the blob.
.. method:: seek(offset, origin=os.SEEK_SET, /)
Set the current access position of the blob to *offset*. The *origin*
argument defaults to :data:`os.SEEK_SET` (absolute blob positioning).
Other values for *origin* are :data:`os.SEEK_CUR` (seek relative to the
current position) and :data:`os.SEEK_END` (seek relative to the blob’s
end).
.. _sqlite3-exceptions:
Exceptions
Expand Down
Expand Up
@@ -1104,57 +1158,6 @@ Exceptions
.. _sqlite3-blob-objects:
Blob Objects
------------
.. versionadded:: 3.11
.. class:: Blob
A :class:`Blob` instance is a :term:`file-like object` that can read and write
data in an SQLite :abbr:`BLOB (Binary Large OBject)`. Call ``len(blob)`` to
get the size (number of bytes) of the blob.
Use the :class:`Blob` as a :term:`context manager` to ensure that the blob
handle is closed after use.
.. literalinclude:: ../includes/sqlite3/blob.py
.. method:: close()
Close the blob.
The blob will be unusable from this point onward. An
:class:`~sqlite3.Error` (or subclass) exception will be raised if any
further operation is attempted with the blob.
.. method:: read(length=-1, /)
Read *length* bytes of data from the blob at the current offset position.
If the end of the blob is reached, the data up to
:abbr:`EOF (End of File)` will be returned. When *length* is not
specified, or is negative, :meth:`~Blob.read` will read until the end of
the blob.
.. method:: write(data, /)
Write *data* to the blob at the current offset. This function cannot
change the blob length. Writing beyond the end of the blob will raise
:exc:`ValueError`.
.. method:: tell()
Return the current access position of the blob.
.. method:: seek(offset, origin=os.SEEK_SET, /)
Set the current access position of the blob to *offset*. The *origin*
argument defaults to :data:`os.SEEK_SET` (absolute blob positioning).
Other values for *origin* are :data:`os.SEEK_CUR` (seek relative to the
current position) and :data:`os.SEEK_END` (seek relative to the blob’s
end).
.. _sqlite3-types:
SQLite and Python types
Expand Down
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
gh-69093: sqlite3 blob doc amendments #91561
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Uh oh!
There was an error while loading. Please reload this page.
gh-69093: sqlite3 blob doc amendments #91561
Filter by extension
Viewed files
Uh oh!
There was an error while loading. Please reload this page.
Uh oh!
There was an error while loading. Please reload this page.
There are no files selected for viewing