summaryrefslogtreecommitdiffstats
path: root/docs/api/copy.rst
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--docs/api/copy.rst117
1 files changed, 117 insertions, 0 deletions
diff --git a/docs/api/copy.rst b/docs/api/copy.rst
new file mode 100644
index 0000000..81a96e2
--- /dev/null
+++ b/docs/api/copy.rst
@@ -0,0 +1,117 @@
+.. currentmodule:: psycopg
+
+COPY-related objects
+====================
+
+The main objects (`Copy`, `AsyncCopy`) present the main interface to exchange
+data during a COPY operations. These objects are normally obtained by the
+methods `Cursor.copy()` and `AsyncCursor.copy()`; however, they can be also
+created directly, for instance to write to a destination which is not a
+database (e.g. using a `~psycopg.copy.FileWriter`).
+
+See :ref:`copy` for details.
+
+
+Main Copy objects
+-----------------
+
+.. autoclass:: Copy()
+
+ The object is normally returned by `!with` `Cursor.copy()`.
+
+ .. automethod:: write_row
+
+ The data in the tuple will be converted as configured on the cursor;
+ see :ref:`adaptation` for details.
+
+ .. automethod:: write
+ .. automethod:: read
+
+ Instead of using `!read()` you can iterate on the `!Copy` object to
+ read its data row by row, using ``for row in copy: ...``.
+
+ .. automethod:: rows
+
+ Equivalent of iterating on `read_row()` until it returns `!None`
+
+ .. automethod:: read_row
+ .. automethod:: set_types
+
+
+.. autoclass:: AsyncCopy()
+
+ The object is normally returned by ``async with`` `AsyncCursor.copy()`.
+ Its methods are similar to the ones of the `Copy` object but offering an
+ `asyncio` interface (`await`, `async for`, `async with`).
+
+ .. automethod:: write_row
+ .. automethod:: write
+ .. automethod:: read
+
+ Instead of using `!read()` you can iterate on the `!AsyncCopy` object
+ to read its data row by row, using ``async for row in copy: ...``.
+
+ .. automethod:: rows
+
+ Use it as `async for record in copy.rows():` ...
+
+ .. automethod:: read_row
+
+
+.. _copy-writers:
+
+Writer objects
+--------------
+
+.. currentmodule:: psycopg.copy
+
+.. versionadded:: 3.1
+
+Copy writers are helper objects to specify where to write COPY-formatted data.
+By default, data is written to the database (using the `LibpqWriter`). It is
+possible to write copy-data for offline use by using a `FileWriter`, or to
+customize further writing by implementing your own `Writer` or `AsyncWriter`
+subclass.
+
+Writers instances can be used passing them to the cursor
+`~psycopg.Cursor.copy()` method or to the `~psycopg.Copy` constructor, as the
+`!writer` argument.
+
+.. autoclass:: Writer
+
+ This is an abstract base class: subclasses are required to implement their
+ `write()` method.
+
+ .. automethod:: write
+ .. automethod:: finish
+
+
+.. autoclass:: LibpqWriter
+
+ This is the writer used by default if none is specified.
+
+
+.. autoclass:: FileWriter
+
+ This writer should be used without executing a :sql:`COPY` operation on
+ the database. For example, if `records` is a list of tuples containing
+ data to save in COPY format to a file (e.g. for later import), it can be
+ used as:
+
+ .. code:: python
+
+ with open("target-file.pgcopy", "wb") as f:
+ with Copy(cur, writer=FileWriter(f)) as copy:
+ for record in records
+ copy.write_row(record)
+
+
+.. autoclass:: AsyncWriter
+
+ This class methods have the same semantics of the ones of `Writer`, but
+ offer an async interface.
+
+ .. automethod:: write
+ .. automethod:: finish
+
+.. autoclass:: AsyncLibpqWriter