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SQL Client for Analyze Boston

Edit and execute SQL queries in the browser using the CKAN DataStore API on the Analyze Boston Datasets

Getting Started

A User Guide is included in the application's Help dialog.

A Develop Guide has not been created yet.

The Administrator Guide is simply the "Installation" section below.

Motivation

This project is motivated by the workflow hurdles when working with the CKAN datastore_search_sql API, which offers the full power of Postgres through a clumsy interface. Some challenges I encountered:

  • The endpoint requires more than just URLEncoding (what about *, ', !, (, ))
  • The errors aren't particularly intuitive (i.e. any data exception, like division_by_zero results in an opaque 500 error)

Installation

  1. Clone the repo
  2. Get the latest Ace editor and store it in src-noconflict/
  3. Customize config.js
  4. Run php -f schema-generator.php > schema.js
  5. Serve it (I prefer php -S localhost:8000)

NOTE To disable the proxy, run localStorage.setItem('proxy',false);

Developer Guide

WARNING This code is MESSY and the abuse of the global namespace is attrocious. Oops.

Prerequisites

  • Profiency with Javascript, HTML and CSS
  • Basic understanding of CKAN Project's dataset web services (especially package_search, datastore_search & datastore_search_sql)
  • Probably run SELECT version(); so you know what version of Postgres you're working with (e.g. --PostgreSQL 9.6.9 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.9.3, 64-bit)

Project Structure / Application Architecture

Basically all the functionality is contained in app.js

+-Browser------------------------------------------------+
| index.html ---> app.js                                 |
|  - style.css     -setup: config, render, etc           |
|  - Lib: ace.js   -execute: call API & handle response  |
|  - Helpers       -render: (re)draw UI elements         |
|    - help.js                                           |
|    - schema.js                                         |
|    - config.js                                         |
+--------------------------------------------------------+

Making Changes

Basiscally, to change anything interesting, you should go into app.js and make changes, taking care that you let all the setup<Stuff>() functions run first, since they set stuff up and do the initial rendering.

Modal Dialogs

For modal dialogs we use (abuse?) the :target pseudo-selector.

To add a new modal dialog simply configure a new element with class="lightbox" id="your-id", then to display the modal use <a href="your-id">Link</a> (or document.location.hash = "your-id")

Debugging

In almost all cases, the Browser's developer tools are the best option.

A weak debug mode (localStorage.setItem('debug','true')) will result in calls to log([]) getting displayed on the console.

You can create a nested log by passing {"label":"MyLabel","logs":[]}

Testing

Completely manual. Goodluck!

NOTE Most testing to date has been done in Chrome, and only the very slightest of attempts has been made at cross-browser testing.

Documentation Links

Roadmap

  • Documentation
    • Error Examples (add to the troubleshooting section of help.js)
    • Example of Rollup/Cube
  • Features
    • Query History: reverse chronological
    • Schema Browser sidebar
    • Schema Browser should filter to active table
    • Schema Browser display to metadata about a dataset
  • Project (ways to improve the project and code within)
  • Icebox (Things I'm not planning to implement)
    • Editor Tabs (Do we really need this?)
    • BUG: results for errors (Doesn't seem like this is needed?)
    • Typehead: default transforms (e.g. into decimals, 1) create table of fully qualified names and types 2) implement
    • Typeahad: transform hints: nullif('','')::decimal
    • Adopt a framework
  • Done
  • Developer Guide
  • Layout: Resize & fullscreen panels
  • Example: CTE & Window
  • Improve Use of Config
  • Proxy (only needed to handle 409s)
  • Separate scripts and CSS
  • Add DEBUG mode (with console.log())
  • Example: Polygon
  • Filter results
  • Layout: Improve colors and positioning
  • Add datatype to schema for browser and typeahead
  • Typeahead Improvements: BUG: Typehead broken without tablename
    • Typeahead Improvements: Human readable table names
    • Typeahead Improvements: Show datatype in typeahead
    • Typeahead Improvements: Configurable autocomplete? (I think this means search tables until one is set)
  • History
    • show query history
    • Retrieve results
  • Scrape schema: SELECT * FROM "" LIMIT 1; response.result.fields ex {type: "text", id: "year"}
  • add basic typeahead
  • Errors
    • look at the response.success property
    • display the error!
  • Download as CSV/TSV
  • Copy to clipboard
  • Schema browser panel
  • Enable worksheet to have multiple queries
  • Usage Instructions
  • Welcome Screen
  • Trim semicolins
  • Example: PIVOT via FILTER()
  • Example: Permits
  • Example: Crime
  • Example: 311
  • Deeplinking (with query)
  • Add Editor Saving
  • Change Examples to dialog

Ideas

Convert to CKAN Extension

This project is probably a good candidate for a CKAN extension

Some work will need to be done to genericize it.

Infer Data Type

We should look for indicators (e.g. field name contains "date") then set $.filed.info.type_override in schema-generator.php

DateTime
_dt
_DT
_date
date$
timestamp

Total
Cost

Refactoring Thoughts

  • Move ace setup into app.js

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Edit and execute SQL queries in the browser using the CKAN DataStore API on the Analyze Boston Datasets

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