Service OData requests from an inmemory data store
npm install odata4-inmemoryService OData v4 requests from an in memory data store.
In most cases servicing data from memory is not possible - in this case you can use the
OData V4 MongoDB Connector
The InMemory connector can be safely used in IoT devices.
- Server: Create high speed, standard compliant data sharing apis
- Server: Use as a mock or swap-in for acceptance tests in place of the mongodb connector
- Client: use the OData syntax to define data queries or value returning expressions as strings (stored in a configuration) and compile and execute later as JS functions
javascript
import { createFilter } from 'odata-v4-inmemory' //example request: GET /api/products?$filter=category/id eq 5 or color eq 'Red'
app.get("/api/products", (req: Request, res: Response) => {
const data = getYourProductArray() //or similar :)
const filterFn = createFilter(req.query.$filter)
res.json(data.filter(filterFn))
})
`Usage ES5
javascript
var createFilter = require('odata-v4-inmemory').createFilter app.get("/api/products", function(req, res) {
var data = getYourProductArray() //or similar :)
var filterFn = createFilter(req.query.$filter)
res.json(data.filter(filterFn))
})
`Using as expression engine
javascript
import { compileExpression } from 'odata-v4-inmemory' const expression = compileExpression("concat((Size add 12) mul 3,Name)")
const item = {Size:1, Name:'Chai'}
console.log(expression(item))
>> 39Chai
``
For now $filter
Support for $select and $expand is next.
We are into creating a comprehensive feature availability chart for V1 release
✓ expression 5.1.1.6.3: null
✓ expression 5.1.1.6.1: NullValue eq null
✓ expression 5.1.1.6.1: duration'P12DT23H59M59.999999999999S'
✓ expression 5.1.1.6.1: A eq INF
✓ expression 5.1.1.6.1: A eq 0.31415926535897931e1
✓ expression 5.1.1.6.1: A add B eq hour(07:59:59.999)
✓ expression 5.1.1.6.2: ["a","b"]
✓ expression 5.1.1.1.1: 1 eq 1
✓ expression 5.1.1.1.1: null eq null
✓ expression 5.1.1.1.2: A ne 1
✓ expression 5.1.1.1.3: A gt 2
✓ expression 5.1.1.1.4: A ge 3
✓ expression 5.1.1.1.5: A lt 2
✓ expression 5.1.1.1.6: A le 2
✓ expression 5.1.1.2.3: -A eq 1
✓ expression: A
✓ expression: A/b
✓ expression: A/b eq 1
✓ expression: A/b eq A/b
✓ expression 5.1.1.3: (A/b eq B/a) or (B/c lt 4) and ((E add 2) gt B add A)
✓ expression 5.1.1.1.9: not A ne 1
- expression 5.1.1.1.10: A has enum'b
✓ expression 4.8: A/$count
✓ expression: A/$count eq 3
✓ expression: A le B
✓ expression: A ge B
✓ expression 5.1.1.1.7: A and B
✓ expression 5.1.1.1.8: A or B
✓ expression: (A and B)
✓ expression: A/$count gt 2 and A/$count lt 4
✓ expression: (A/$count gt 2) and A/$count lt 3
✓ expression 5.1.1.2.1: A add B
- expression 5.1.1.2.1: '2016-01-01' add 'P4DT15H'
- expression 5.1.1.2.1: '2016-01-01T12:00:00Z' add 'P4DT15H'
- expression 5.1.1.2.1: duration'P4DT15H' add duration'P4DT15H'
✓ expression 5.1.1.2.1: A sub B
- expression 5.1.1.2.1: '2016-01-01T12:00:00Z' sub 'P4DT15H'
✓ expression: 5 sub 10
✓ expression 5.1.1.2.4: A mul B
✓ expression 5.1.1.2.4: 5 mul 10
✓ expression 5.1.1.2.5: 10 div 3
✓ expression 5.1.1.2.5: (A mul B) div 10
✓ expression 5.1.1.2.6: (A mod B) div 10
✓ expression: A add 'B'
✓ expression: 'A' add 'B'
✓ expression: A/$count add B/$count eq 7
✓ expression: $it eq 5
✓ expression: true eq false
✓ expression: true eq false
✓ expression: A/all(i:i eq 1)
✓ expression: A/all(i:$it eq 1)
✓ expression 5.1.1.5.2: A/all(i: i/a eq 1)
✓ expression 5.1.1.5.1: A/any(i: i/a eq 1)
✓ expression 5.1.1.4.6: substring(A, 2) eq 'BC'
✓ expression: substring('ABC', D) eq 'BC'
✓ expression: substring('ABC', 2) eq 'BC'
✓ expression: A eq 1.5
✓ expression: A eq year(2016-01-01)
✓ expression 5.1.1.4.1: contains(A, 'BC')
✓ expression 5.1.1.4.2: endswith(A, 'CD')
✓ expression 5.1.1.4.3: startswith(A, 'CD')
✓ expression 5.1.1.4.4: length(A) eq 3
✓ expression 5.1.1.4.5: indexof(A, 'DE')
✓ expression 5.1.1.4.7: tolower(A) eq 'abc'
✓ expression 5.1.1.4.8: toupper(A) eq 'ABC'
✓ expression 5.1.1.4.9: trim(A) eq 'abc'
✓ expression 5.1.1.4.10: concat(A,B) eq 'fubar'
✓ expression 5.1.1.4.10: concat(A,concat(B,C)) eq 'fubardoh'
✓ expression 5.1.1.4.11: A eq year(2016-01-01T13:00Z)
✓ expression 5.1.1.4.12: A eq month(2016-01-01T13:00Z)
✓ expression 5.1.1.4.13: A eq day(2016-01-01T13:00Z)
✓ expression 5.1.1.4.14: A eq hour(2016-01-01T13:00Z)
✓ expression 5.1.1.4.15: A eq minute(2016-01-01T13:00Z)
✓ expression 5.1.1.4.16: A eq second(2016-01-01T13:00:02Z)
✓ expression 5.1.1.4.21: year(now())
✓ expression 5.1.1.4.22: year(maxdatetime())
✓ expression 5.1.1.4.23: year(mindatetime())
- expression 5.1.1.4.24: totalseconds(A)
✓ expression 5.1.1.4.25: round(A) eq 42
✓ expression 5.1.1.4.26: floor(A) eq 42
✓ expression 5.1.1.4.27: ceiling(A) eq 42
✓ expression 5.1.1.4.28: isof(Model.Order)
✓ expression 5.1.1.4.28: isof($it, Model.Order)
✓ expression 5.1.1.4.28: Orders/all(item: isof(item, Model.Order))
- expression 5.1.1.4.29: cast(A, Edm.String)
- expression 5.1.1.4.30: geo.distance(A, B)
- expression 5.1.1.4.31: geo.intersects(A, B)
- expression 5.1.1.4.31: geo.length(A)