dql

Build:
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

0.5.12

Differentiate LIMIT and SCAN LIMIT
Options and query syntax for throttling the consumed throughput
Crash fixes and other small robustness improvements

0.5.11

SELECT <attributes> can now use full expressions

0.5.10

LOAD command to insert records from a file created with SELECT ... SAVE
Default SAVE format is pickle
SAVE command can gzip the file

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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