Package: dw-python-monetdb-async
This version of the Python 3 MonetDB client includes some additional features to support bulk copy operationsIntroductionThis is the new native Python client API.  This API is cross-platform,
and doesn’t depend on any monetdb libraries.  It has support for
Python 3.2+ and is Python DBAPI 2.0 compatible.This is a fork of the code distributed with MonetDB that adds support
for asynchronous operation (requiresgreenlet) and bulk I/O
withCOPY.InstallationTo install the MonetDB Python API run the following command from the
python source directory:# python setup.py installThat’s all, now you are ready to start using the API.DocumentationThe Python code is well documented, so if you need to find
documentation you should have a look at the source code.  Below is an
interactive example on how to use the MonetDB SQL API which should get
you started quite fast.ExamplesThere are some examples in the ‘examples’ folder, but here are is a
line by line example of the SQL API:> # import the SQL module
> import monetdb.sql
>
> # set up a connection. arguments below are the defaults
> connection = monetdb.sql.connect(username="monetdb", password="monetdb", hostname="localhost", database="demo")
>
> # create a cursor
> cursor = connection.cursor()
>
> # increase the rows fetched to increase performance (optional)
> cursor.arraysize = 100
>
> # execute a query (return the number of rows to fetch)
> cursor.execute('SELECT * FROM tables')
26
>
> # fetch only one row
> cursor.fetchone()
[1062, 'schemas', 1061, None, 0, True, 0, 0]
>
> # fetch the remaining rows
> cursor.fetchall()
[[1067, 'types', 1061, None, 0, True, 0, 0],
 [1076, 'functions', 1061, None, 0, True, 0, 0],
 [1085, 'args', 1061, None, 0, True, 0, 0],
 [1093, 'sequences', 1061, None, 0, True, 0, 0],
 [1103, 'dependencies', 1061, None, 0, True, 0, 0],
 [1107, 'connections', 1061, None, 0, True, 0, 0],
 [1116, '_tables', 1061, None, 0, True, 0, 0],
 ...
 [4141, 'user_role', 1061, None, 0, True, 0, 0],
 [4144, 'auths', 1061, None, 0, True, 0, 0],
 [4148, 'privileges', 1061, None, 0, True, 0, 0]]
>
> # Show the table meta data
> cursor.description
[('id', 'int', 4, 4, None, None, None),
 ('name', 'varchar', 12, 12, None, None, None),
 ('schema_id', 'int', 4, 4, None, None, None),
 ('query', 'varchar', 168, 168, None, None, None),
 ('type', 'smallint', 1, 1, None, None, None),
 ('system', 'boolean', 5, 5, None, None, None),
 ('commit_action', 'smallint', 1, 1, None, None, None),
 ('temporary', 'tinyint', 1, 1, None, None, None)]If you would like to communicate with the database at a lower level
you can use the MAPI library:> from monetdb import mapi
> server = mapi.Server()
> server.connect(hostname="localhost", port=50000, username="monetdb", password="monetdb", database="demo", language="sql")
> server.cmd("sSELECT * FROM tables;")
...Copying a table from PostgreSQL (using the Psycopg2 driver) to MonetDB:data = io.StringIO()

pg_cursor = pg_conn.cursor()
pg_cursor.copy_expert(
    """COPY {} TO STDOUT WITH CSV QUOTE '"' ESCAPE '\\' NULL ''""".format(pg_table), data)
data.seek(0)

monetdb_cursor = monetdb_conn.cursor()
monetdb_cursor.copy_from(data, monetdb_table, string_quote='"', null_string='')
monetdb_conn.commit()