bloom-sql

Chained functions for building SQL strings for node-postgres.

npm install bloom-sql
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What are you?

I am an overly simple library to make it a bit easier to build simple SQL statements for node-postgres (affectionaly known as pg). I generate the { text: '...', values: [] } objects that you typically pass to client.query(...).

It gets tedious matching up $1, $2 etc. and building the right kind of values array. My functions help you do this and get the place-holder numbers right, even for UPDATE/SET/WHERE and for WHERE IN clauses and Postgres ARRAY[] values which require a flattened array of arguments.

I have some tests written in Mocha. Of course I could use more!

No really. Overly simple.

Like what?

var SQL = require('bloom-sql'),
    INSERT = SQL.INSERT,
    SELECT = SQL.SELECT,
    UPDATE = SQL.UPDATE,
    DELETE = SQL.DELETE;

Selecting stuff:

> SELECT().FROM('foo').WHERE({ a: [1,2,3], b: 4 });
{ text: 'SELECT * FROM foo WHERE a IN ($1, $2, $3) AND b = $4',
  values: [ 1, 2, 3, 4 ] }

Deleting stuff:

> DELETE('foo').WHERE({ a: 1, b: 2 });
{ text: 'DELETE FROM foo WHERE a = $1 AND b = $2',
  values: [ 1, 2 ] }

Inserting stuff:

> INSERT('foo').VALUES({ a: null, b: null, c: null });
{ text: 'INSERT INTO foo(a, b, c) VALUES($1, $2, $3)',
  values: [ null, null, null ] }

Updating stuff:

> UPDATE('foo').SET({ a: 1, b: 2, c: 3 }).WHERE({ d: 4, e: 5 }).RETURNING('*');
{ text: 'UPDATE foo SET a = $1, b = $2, c = $3 WHERE d = $4 AND e = $5 RETURNING *',
  values: [ 1, 2, 3, 4, 5 ] }

This code does not talk to the database. Connect to pg as normal as pass one of the resulting query objects to the db to run it:

var pg = require('pg'),
    SELECT = require('bloom-sql').SELECT;

var db = new pg.Client('YOUR_DB_URL');
db.connect();

var query = SELECT('*').FROM('users').WHERE({id:1}).LIMIT(1);
db.query(query, function(err,results){
  // ensure !err
  // check results.rowCount === 1 
  // do stuff with results.rows[0]
});

TODO

  • complex conjunctions (a = 1 AND b = 2) OR (c = 3 AND d = 4)
  • comparisons in where clauses (a > 1 AND b < 2)
  • any hint of JOIN, sub-select, etc.
  • the other 90% of SQL?
  • it would be nice to support Postgres ARRAY operators in WHERE clauses, but this probably requires a different way of doing IN queries. Right now:
    • in UPDATE and INSERT, a JS Array [1,2,3] will be converted into a Postgres ARRAY[$1,$2,$3] and the values flattened appropriately for the prepared statement
    • in WHERE clauses, a JS Array [1,2,3] will be converted into a SQL IN ($1,$2,$3) and the values flattened appropriately for the prepared statement

Installation

npm install bloom-sql --save

(--save automatically updates your package.json file, tell your friends)

License

(The MIT License)

Copyright (c) 2011-2012 Bloom Studio, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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