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Tool for migrating/converting from mysql to postgresql.

Project description

========================================================================================
py-mysql2pgsql - A tool for migrating/converting/exporting data from MySQL to PostgreSQL
========================================================================================

This tool allows you to take data from an MySQL server (only tested on
5.x) and write a PostgresSQL compatable (8.2 or higher) dump file or pipe it directly
into your running PostgreSQL server (8.2 or higher).

.. attention::
Currently there is no support for importing `spatial data from MySQL
<http://dev.mysql.com/doc/refman/5.5/en/spatial-extensions.html>`_.


Installation:
=============

If you're like me you don't like random stuff polluting your python
install. Might I suggest installing this in an virtualenv?

::

> virtualenv --no-site-packages ~/envs/py-mysql2pgsql
> source ~/envs/py-mysql2pgsql/bin/activate


Requirements:
-------------

* `Python 2.6 or 2.7 <http://www.python.org/getit/>`_
* `MySQL-python <http://pypi.python.org/pypi/MySQL-python>`_
* `psycopg2 <http://pypi.python.org/pypi/psycopg2>`_
* `PyYAML <http://pypi.python.org/pypi/PyYAML>`_
* `termcolor <http://pypi.python.org/pypi/termcolor>`_ (unless you're installing on windows)


On Windows
----------

I have only done limited testing on this platform using Python
2.7. Here are the driver dependencies for windows, install these
before attempting to install py-mysql2pgsql or it will fail.

* `psycopg2 for Windows <http://www.stickpeople.com/projects/python/win-psycopg/>`_
* `MySQL-python for Windows <http://www.codegood.com/archives/129>`_



From PyPI:
----------

All dependencies **should** be automatically installed when installing
the app the following ways

::

> pip install py-mysql2pgsql


From source:
------------

::

> git clone git://github.com/philipsoutham/py-mysql2pgsql.git
> cd py-mysql2pgsql
> python setup.py install


Usage:
======

Looking for help?

::

> py-mysql2pgsql -h
usage: py-mysql2pgsql [-h] [-v] [-f FILE]

Tool for migrating/converting data from mysql to postgresql.

optional arguments:
-h, --help show this help message and exit
-v, --verbose Show progress of data migration.
-f FILE, --file FILE Location of configuration file (default:
mysql2pgsql.yml). If none exists at that path,
one will be created for you.


Don't worry if this is your first time, it'll be gentle.

::

> py-mysql2pgsql
No configuration file found.
A new file has been initialized at: mysql2pgsql.yml
Please review the configuration and retry...

As the output suggests, I file was created at mysql2pgsql.yml for you
to edit. For the impatient, here is what the file contains.

::

# if a socket is specified we will use that
# if tcp is chosen you can use compression
mysql:
hostname: localhost
port: 3306
socket: /tmp/mysql.sock
username: mysql2psql
password:
database: mysql2psql_test
compress: false
destination:
# if file is given, output goes to file, else postgres
file:
postgres:
hostname: localhost
port: 5432
username: mysql2psql
password:
database: mysql2psql_test

# if only_tables is given, only the listed tables will be converted. leave empty to convert all tables.
#only_tables:
#- table1
#- table2
# if exclude_tables is given, exclude the listed tables from the conversion.
#exclude_tables:
#- table3
#- table4

# if supress_data is true, only the schema definition will be exported/migrated, and not the data
supress_data: false

# if supress_ddl is true, only the data will be exported/imported, and not the schema
supress_ddl: false

# if force_truncate is true, forces a table truncate before table loading
force_truncate: false


Pretty self explainitory right? A couple things to note, first if
`destination -> file` is populated all outpute will be dumped to the
specified location regardless of what is contained in `destination ->
postgres`. So if you want to dump directly to your server make sure
the `file` value is blank.

Say you have a MySQL db with many, many tables, but you're only
interested in exporting a subset of those table, no problem. Add only
the tables you want to include in `only_tables` or tables that you
don't want exported to `exclude_tables`.

Other items of interest may be to skip moving the data and just create
the schema or vice versa. To skip the data and only create the schema
set `supress_data` to `true`. To migrate only data and not recreate the
tables set `supress_ddl` to `true`; if there's existing data that you
want to drop before importing set `force_truncate` to
`true`. `force_truncate` is not necessary when `supress_ddl` is set to
`false`.

One last thing, the `--verbose` flag. Without it the tool will just go
on it's merry way without bothering you with any output until it's
done. With it you'll get a play-by-play summary of what's going
on. Here's an example.

::

> py-mysql2pgsql -v -f mysql2pgsql
START PROCESSING table_one
START - CREATING TABLE table_one
FINISH - CREATING TABLE table_one
START - WRITING DATA TO table_one
24812.02 rows/sec [20000]
FINISH - WRITING DATA TO table_one
START - ADDING INDEXES TO table_one
FINISH - ADDING INDEXES TO table_one
START - ADDING CONSTRAINTS ON table_one
FINISH - ADDING CONSTRAINTS ON table_one
FINISHED PROCESSING table_one

START PROCESSING table_two
START - CREATING TABLE table_two
FINISH - CREATING TABLE table_two
START - WRITING DATA TO table_two

FINISH - WRITING DATA TO table_two
START - ADDING INDEXES TO table_two
FINISH - ADDING INDEXES TO table_two
START - ADDING CONSTRAINTS ON table_two
FINISH - ADDING CONSTRAINTS ON table_two
FINISHED PROCESSING table_two


Data Type Conversion Legend
===========================

Since there is not a one-to-one mapping between MySQL and
PostgreSQL data types, listed below are the conversions that are applied. I've
taken some liberties with some, others should come as no surprise.

==================== ===========================================
MySQL PostgreSQL
==================== ===========================================
char character
varchar character varying
tinytext text
mediumtext text
text text
longtext text
tinyblob bytea
mediumblob bytea
blob bytea
longblob bytea
binary bytea
varbinary bytea
bit bit varying
tinyint smallint
tinyint unsigned smallint
smallint smallint
smallint unsigned integer
mediumint integer
mediumint unsigned integer
int integer
int unsigned bigint
bigint bigint
bigint unsigned numeric
float real
float unsigned real
double double precision
double unsigned double precision
decimal numeric
decimal unsigned numeric
numeric numeric
numeric unsigned numeric
date date
datetime timestamp without time zone
time time without time zone
timestamp timestamp without time zone
year smallint
enum character varying (with `check` constraint)
set ARRAY[]::text[]
==================== ===========================================


About:
======

I ported much of this from an existing project written in Ruby by Max
Lapshin over at `<https://github.com/maxlapshin/mysql2postgres>`_. I
found that it worked fine for most things, but for migrating large tables
with millions of rows it started to break down. This motivated me to
write *py-mysql2pgsql* which uses a server side cursor, so there is no "paging"
which means there is no slow down while working it's way through a
large dataset.

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