pgcli/README.rst

A REPL for Postgres
-------------------

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This is a postgres client that does auto-completion and syntax highlighting.

Home Page: http://pgcli.com

MySQL Equivalent: http://mycli.net

.. image:: screenshots/pgcli.gif
.. image:: screenshots/image01.png

Quick Start
-----------

If you already know how to install python packages, then you can simply do:

::

    $ pip install -U pgcli

    or

    $ brew install pgcli  # Only on macOS

If you don't know how to install python packages, please check the
`detailed instructions`__.

__ https://github.com/dbcli/pgcli#detailed-installation-instructions

Usage
-----

::

    $ pgcli [database_name]

    or

    $ pgcli postgresql://[user[:password]@][netloc][:port][/dbname]

Examples:

::

    $ pgcli local_database

    $ pgcli postgres://amjith:pa$$w0rd@example.com:5432/app_db

Features
--------

The `pgcli` is written using prompt_toolkit_.

* Auto-completes as you type for SQL keywords as well as tables and
  columns in the database.
* Syntax highlighting using Pygments.
* Smart-completion (enabled by default) will suggest context-sensitive
  completion.

    - ``SELECT * FROM <tab>`` will only show table names.
    - ``SELECT * FROM users WHERE <tab>`` will only show column names.

* Primitive support for ``psql`` back-slash commands.
* Pretty prints tabular data.
  Note: `pgcli` uses the `tabulate`_ package to pretty-print tables. This library does smart formatting
  of numbers, which can sometimes lead to unexpected output. See `this issue`_ for more details.

.. _prompt_toolkit: https://github.com/jonathanslenders/python-prompt-toolkit
.. _tabulate: https://github.com/dbcli/pgcli/blob/master/pgcli/packages/tabulate.py
.. _this issue: https://github.com/dbcli/pgcli/issues/617

Config
------
A config file is automatically created at ``~/.config/pgcli/config`` at first launch.
See the file itself for a description of all available options.

Contributions:
--------------

If you're interested in contributing to this project, first of all I would like
to extend my heartfelt gratitude. I've written a small doc to describe how to
get this running in a development setup.

https://github.com/dbcli/pgcli/blob/master/DEVELOP.rst

Please feel free to reach out to me if you need help.
My email: amjith.r@gmail.com, Twitter: `@amjithr <http://twitter.com/amjithr>`_

Detailed Installation Instructions:
-----------------------------------

macOS:
======

The easiest way to install pgcli is using Homebrew.

::

    $ brew install pgcli

Done!

Alternatively, you can install ``pgcli`` as a python package using a package
manager called called ``pip``. You will need postgres installed on your system
for this to work.

In depth getting started guide for ``pip`` - https://pip.pypa.io/en/latest/installing.html.

::

    $ which pip

If it is installed then you can do:

::

    $ pip install pgcli

If that fails due to permission issues, you might need to run the command with
sudo permissions.

::

    $ sudo pip install pgcli

If pip is not installed check if easy_install is available on the system.

::

    $ which easy_install

    $ sudo easy_install pgcli

Linux:
======

In depth getting started guide for ``pip`` - https://pip.pypa.io/en/latest/installing.html.

Check if pip is already available in your system.

::

    $ which pip

If it doesn't exist, use your linux package manager to install `pip`. This
might look something like:

::

    $ sudo apt-get install python-pip   # Debian, Ubuntu, Mint etc

    or

    $ sudo yum install python-pip  # RHEL, Centos, Fedora etc

``pgcli`` requires python-dev, libpq-dev and libevent-dev packages. You can
install these via your operating system package manager.


::

    $ sudo apt-get install python-dev libpq-dev libevent-dev

    or

    $ sudo yum install python-devel postgresql-devel

Then you can install pgcli:

::

    $ sudo pip install pgcli


Docker
======

Pgcli can be run from within Docker. This can be useful to try pgcli without
installing it, or any dependencies, system-wide.

To build the image:

::

    $ docker build -t pgcli .

To create a container from the image:

::

    $ docker run --rm -ti pgcli pgcli <ARGS>

To access postgresql databases listening on localhost, make sure to run the
docker in "host net mode". E.g. to access a database called "foo" on the
postgresql server running on localhost:5432 (the standard port):

::

    $ docker run --rm -ti --net host pgcli pgcli -h localhost foo

To connect to a locally running instance over a unix socket, bind the socket to
the docker container:

::

    $ docker run --rm -ti -v /var/run/postgres:/var/run/postgres pgcli pgcli foo


IPython
=======

Pgcli can be run from within IPython console. When working on a query, it may be useful to drop
into a pgcli session without leaving the IPython console, iterate on a query, then quit pgcli
to find the query results in your IPython workspace.

Assuming you have IPython installed:

::

    $ pip install ipython-sql

After that, run ipython and load the ``pgcli.magic`` extension:

::

    $ ipython
    Python 2.7.12 (default, Nov  1 2016, 07:58:43)
    Type "copyright", "credits" or "license" for more information.

    IPython 5.4.1 -- An enhanced Interactive Python.
    ?         -> Introduction and overview of IPython's features.
    %quickref -> Quick reference.
    help      -> Python's own help system.
    object?   -> Details about 'object', use 'object??' for extra details.

    In [1]: %load_ext pgcli.magic


Connect to a database and construct a query:

::

    In [2]: %pgcli postgres://someone@localhost:5432/world
    Connected: someone@world
    Version: 1.7.0
    Chat: https://gitter.im/dbcli/pgcli
    Mail: https://groups.google.com/forum/#!forum/pgcli
    Home: http://pgcli.com
    someone@localhost:world> select * from city c where countrycode = 'USA' and population > 1000000;
    +------+--------------+---------------+--------------+--------------+
    | id   | name         | countrycode   | district     | population   |
    |------+--------------+---------------+--------------+--------------|
    | 3793 | New York     | USA           | New York     | 8008278      |
    | 3794 | Los Angeles  | USA           | California   | 3694820      |
    | 3795 | Chicago      | USA           | Illinois     | 2896016      |
    | 3796 | Houston      | USA           | Texas        | 1953631      |
    | 3797 | Philadelphia | USA           | Pennsylvania | 1517550      |
    | 3798 | Phoenix      | USA           | Arizona      | 1321045      |
    | 3799 | San Diego    | USA           | California   | 1223400      |
    | 3800 | Dallas       | USA           | Texas        | 1188580      |
    | 3801 | San Antonio  | USA           | Texas        | 1144646      |
    +------+--------------+---------------+--------------+--------------+
    SELECT 9
    Time: 0.003s


Exit out of pgcli session with ``Ctrl + D`` and find the query results:

::

    someone@localhost:world>
    Goodbye!
    9 rows affected.
    Out[2]:
    [(3793, u'New York', u'USA', u'New York', 8008278),
     (3794, u'Los Angeles', u'USA', u'California', 3694820),
     (3795, u'Chicago', u'USA', u'Illinois', 2896016),
     (3796, u'Houston', u'USA', u'Texas', 1953631),
     (3797, u'Philadelphia', u'USA', u'Pennsylvania', 1517550),
     (3798, u'Phoenix', u'USA', u'Arizona', 1321045),
     (3799, u'San Diego', u'USA', u'California', 1223400),
     (3800, u'Dallas', u'USA', u'Texas', 1188580),
     (3801, u'San Antonio', u'USA', u'Texas', 1144646)]

The results are available in special local variable ``_``, and can be assigned to a variable of your
choice:

::

    In [3]: my_result = _


Thanks:
-------

A special thanks to `Jonathan Slenders <https://twitter.com/jonathan_s>`_ for
creating `Python Prompt Toolkit <http://github.com/jonathanslenders/python-prompt-toolkit>`_,
which is quite literally the backbone library, that made this app possible.
Jonathan has also provided valuable feedback and support during the development
of this app.

`Click <http://click.pocoo.org/>`_ is used for command line option parsing
and printing error messages.

Thanks to `psycopg <http://initd.org/psycopg/>`_ for providing a rock solid
interface to Postgres database.

Thanks to all the beta testers and contributors for your time and patience. :)


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