criterion

criterion

criterion can describe sql where-conditions as objects for nodejs

inspired by the mongo query language

install

npm install criterion

use

require

criterion = require 'criterion'

create from string and parameters

c = criterion 'x = ?', 6

c.sql()     # 'x = ?'
c.params()  # [6]

create from object

c = criterion {x: 7}

c.sql()     # 'x = ?'
c.params()  # [7]

and and or

fst = criterion {x: 7, y: 'foo'}
snd = criterion 'z = ?', true

fst.and(snd).sql()      # '(x = ?) AND (y = ?) AND (z = ?)'
fst.and(snd).params()   # [7, 'foo', true]

snd.or(fst).sql()       # '(z = ?) OR (x = ? AND y = ?)'
snd.or(fst).params()    # [true, 7, 'foo']

not

c = criterion {x: 7, y: 'foo'}

c.not().sql()           # 'NOT ((x = ?) AND (y = ?))'
c.not().params()        # [7, 'foo', true]

c.not().not().sql()     # '(x = ?) AND (y = ?)'
c.not().not().params()  # [7, 'foo', true]

criteria are immutable: and, or and not return new objects.

possible function arguments to criterion

find where x = 7 and y = 'foo'

{x: 7, y: 'foo'}
# or
[{x: 7}, {y: 'foo'}]
# or
'x = ? AND y = ?', 7, 'foo'

find where x is in [1, 2, 3]

{x: [1, 2, 3]}

find where x is not in [1, 2, 3]

{x: {$nin: [1, 2, 3]}}

find where x != 3

{x: {$ne: 3}}
# or
'x != ?', 3

find where x < 3 and y <= 4

{x: {$lt: 3}, y: {$lte: 4}}
# or
'x < ? AND y <= ?', 3, 4

find where x > 3 and y >= 4

{x: {$gt: 3}, y: {$gte: 4}}
# or
'x > ? AND y >= ?', 3, 4

find where not (x > 3 and y >= 4)

{$not: {x: {$gt: 3}, y: {$gte: 4}}}
# or
'NOT (x > ? AND y >= ?)', 3, 4

find where x < NOW()

'x < NOW()'

find where x is between 5 and 10

'x BETWEEN ? AND ?', 5, 10

find where x = 7 or y = 6

{$or: [{x: 7}, {y: 6}]}
# or
{$or: {x: 7, y: 6}}
# or
'x = ? OR y = ?', 7, 6

find where x is null

{x: {$null: true}}
# or
'x IS NULL'

find where x is not null

{x: {$null: false}}
# or
'x IS NOT NULL'

all query parts can be composed at will!

license: MIT