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DynamoDB Query Language

Project description

DQL

Build:build coverage
Documentation:http://dql.readthedocs.org/
Downloads:http://pypi.python.org/pypi/dql
Source:https://github.com/mathcamp/dql

A simple, SQL-ish language for DynamoDB

Getting Started

Install with pip:

pip install dql

Here are some basic DQL examples to get you going:

Start the REPL:

$ dql
us-west-1>

Creating a table:

us-west-1> CREATE TABLE forum_threads (name STRING HASH KEY,
         >                             subject STRING RANGE KEY,
         >                             THROUGHPUT (4, 2));

Inserting data:

us-west-1> INSERT INTO forum_threads (name, subject, views, replies)
         > VALUES ('Self Defense', 'Defense from Banana', 67, 4),
         > ('Self Defense', 'Defense from Strawberry', 10, 0),
         > ('Cheese Shop', 'Anyone seen the camembert?', 16, 1);

Queries:

us-west-1> SCAN * FROM forum_threads;
us-west-1> SELECT count(*) FROM forum_threads WHERE name = 'Self Defense';
us-west-1> SELECT * FROM forum_threads WHERE name = 'Self Defense';

Mutations:

us-west-1> UPDATE forum_threads ADD views 1 WHERE
         > name = 'Self Defense' AND subject = 'Defense from Banana';
us-west-1> DELETE FROM forum_threads WHERE name = 'Cheese Shop';

Changing tables:

us-west-1> ALTER TABLE forum_threads SET THROUGHPUT (8, 4);
us-west-1> DROP TABLE forum_threads;

And don’t forget to use help!

Changelog

0.5.9

  • Don’t print results to console when saving to a file
  • ‘auto’ pagesize to adapt to terminal height
  • When selecting specific attributes with KEYS IN only those attributes are fetched
  • ORDER BY queries spanning multiple pages no longer stuck on first page
  • Column formatter fits column widths more intelligently
  • Smart formatter is smarter about switching to Expanded mode

0.5.8

  • Tab completion for Mac OS X

0.5.7

  • run_dql.py locks in a version
  • Display output auto-detects terminal width

0.5.6

  • Format option saves properly
  • WHERE expressions can compare fields to fields (e.g. WHERE foo > bar)
  • Always perform batch_get after querying/scanning an index that doesn’t project all attributes

0.5.5

  • General bug fixes
  • Self contained run_dql.py script

0.5.4

  • Fixes for watch display
  • SELECT can save the results to a file

0.5.3

  • ALTER commands can specify IF (NOT) EXISTS
  • New watch command to monitor table consumed capacities
  • SELECT can fetch attributes that aren’t projected onto the queried index
  • SELECT can ORDER BY non-range-key attributes

0.5.2

  • EXPLAIN <query> will print out the DynamoDB calls that will be made when you run the query
  • ANALYZE <query> will run the query and print out consumed capacity information

0.5.1

  • Pretty-format non-item query return values (such as count)
  • Disable passing AWS credentials on the command line

0.5.0

  • Breakage: New syntax for SELECT, SCAN, UPDATE, DELETE
  • Breakage: Removed COUNT query (now SELECT count(*))
  • Breakage: Removed the ability to embed python in queries
  • New alternative syntax for INSERT
  • ALTER can create and drop global indexes
  • Queries and updates now use the most recent DynamoDB expressions API
  • Unified options in CLI under the opt command

0.4.1

  • Update to maintain compatibility with new versions of botocore and dynamo3
  • Improving CloudWatch support (which is used to get consumed table capacity)

0.4.0

  • Breakage: Dropping support for python 3.2 due to lack of botocore support
  • Feature: Support for JSON data types

0.3.2

  • Bug fix: Allow ‘.’ in table names of DUMP SCHEMA command
  • Bug fix: Passing a port argument to local connection doesn’t crash
  • Bug fix: Prompt says ‘localhost’ when connected to DynamoDB local

0.3.1

  • Bug fix: Allow ‘.’ in table names

0.3.0

  • Feature: SELECT and COUNT can have FILTER clause
  • Feature: FILTER clause may OR constraints together

0.2.1

  • Bug fix: Crash when printing ‘COUNT’ queries

0.2.0

  • Feature: Python 3 support

0.1.0

  • First public release

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