Informix REST API Tutorial

REST:
The Key to Driverless,
Unified Access
to JSON, Relational and
Spatio Temporal Data
Brian Hughes
May 2016Erika Von Bargen
vonbarg@us.ibm.com

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individual user will achieve results similar to those stated here.
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Agenda
• Data access challenges
• High Level Solution
• What is REST?
• Why REST?
• REST with Infomix
• New Features for REST
– Stored procedure calls
– Compression
– XML,BSON support
5

Data Access Challenges
• Databases born before the rise of Internet service APIs
require a three-tier architecture to access
• Client → Application Server → Database
• Three-tier architecture solutions typically use different
languages at each layer
• JavaScript → PHP/Node.js → SQL/SPL
• Using different languages at each layer:
• Complicates development, debugging, deployment, & maintenance
• Developer skills, libraries, and tools are duplicated at each layer
• This results in a higher initial cost, lengthened time to
market, and increased long term costs.
7

• Client access to the database is generally through a proprietary,
vendor-supplied driver.
• New web application development frameworks and programming
languages regularly enter the market.
• Customer is dependent on the vendor to support new frameworks
and languages.
• Standard database APIs such as ODBC and JDBC along with bridges
help to mitigate this issue. However, bridges often expose only a
subset of the full capabilities of the client and database.
8

• Timeseries/Geospatial/NoSQL structures
• REST is the WWW. The latest languages,
platforms, and frameworks support REST
(HTTP) on day one.
• JSON is ubiquitous on the Internet due to its
compact representation and expressive
structure.
9

• Data is fragmented across many single-purpose silos:
– Service A for relational data, B for unstructured documents
(JSON/BSON), C for time series data, D for spatial data.
– The most compelling applications rely on integrating multiple types of
data.
– Asking questions that span multiple silos is difficult and time
consuming, both in terms of development and query processing.
• Different query languages and APIs for each type of database.
– Relational Data: SQL
– Unstructured Documents: NoSQL, MongoDB syntax, Xquery
– Time Series Data: Specialized time series query language
10

Summary of Challenges
• Rapidly evolving development landscape.
• Pressure to release quickly and frequently to
capitalize on opportunities.
• Applications that provide the highest value
rely on data that is stored in different silos.
11

High Level Solution
• Support all required data types out-of-the-box.
– Lowers time to market.
• Support SQL and NoSQL queries against required
data types.
– Lowers time to market. Simplifies access to legacy relational data.
Developers without SQL skills can be leveraged.
• Support client access using REST.
– Solution meets customers where they are, rather than forcing them to rely
on the vendor.
13

High Level Solution Architecture
14

Detailed Solution Architecture
15

What is REST?
• REpresentational State Transfer
• A W3C Standard for data access as HTTP/1.1 and
URI (vs URL)
• The World Wide Web is a REST service
• REST is a style of design.
– It is not a technology.
– It is not a protocol.
17

Basic HTTP Methods
• Four basic methods
– GET
A request to retrieve data. Idempotent.
– POST
A request to create a new resource.
– PUT
A request to update/modify the resource referred to by the URI.
– DELETE
A request to delete the resource referred to by the URI.
• This solution does not make use of other HTTP
methods at this time.
18

REST != SOAP
• Both REST and SOAP can be used with HTTP as the protocol.
• With REST
– The components of the URI refer to objects, often in a hierarchy.
– The HTTP method specifies the action to perform on the object.
– Example URIs: /customer/device, /database/table
– Most or all HTTP methods apply to any URL in the model.
• With SOAP
– The components of the URL often refer to application-specific operations that supplant the
HTTP operations. The URL is the API to a class.
– The HTTP method is almost an afterthought.
– Example URLs: /device/getDeviceIds, /device/createDevice
– /device is the class, createDevice is clearly a method
– Running the DELETE method on /device/createDevice would be meaningless/ambiguous.
– //en.wikipedia.org/wiki/Representational_state_transfer
19

Why REST?
• REST is ubiquitous. 70% of APIs are
RESTful.
• Nearly every programming language,
operating system, and device is capable
of using REST (HTTP).
http://blog.programmableweb.com/2013/09/23/programmablewebs-directory-hits-10000-apis-and-counting
20

RESTful Data Access
• URL Structure
– http://<host>[:port]/<db>/<collection>
• 'http' is the name of the scheme, often called the protocol
• host is the domain/host name but can also be a literal IP address
• port is the optional port number
• db, the first component of the resource path, is the db/database name
• collection, the second component of the resource path, is the collection/table name
• The model presented by the REST API is:
– A host contains zero or more dbs (databases).
– A db contains zero or more collections (tables).
– The terms db and collection refer to the MongoDB representations. The terms database and
table refer to the Informix representation. Due to character restrictions, the database name
may be similar but not identical to the db name in some situations.
21

DB Management
• Four basic operations:
– List all databases
– Create a database
– Delete a database
– Delete all databases
25

List All DBs
• Method: GET /
• Response: A JSON array of strings, where each
string is the name of a database
• Example Response:
• [ "stores_demo" , "test" ]
26

Create a DB
• Method: POST /
• POST Data: A JSON document that specifies details about the db to be created. At
a minimum, this document must include the field name' to specify the name of
the db. For example:
• {name: "mydb"}
• {name: "mydb" , locale: "en_us.utf8", dbspace: "dbspace0"}
• Response: A JSON document describing the status of the request.
• {msg:"created database mydb", ok: true}
• Explicit creation of a db is not necessary. If a request for a db that does not exist is
made, it will automatically be created using default values. This was done to
simplify programming.
27

Collection Management
• Three basic operations:
– List all collections
– Create a collection (explicitly)
– Delete a collection
• Delete all collections
– To delete all collections, drop the database
28

List All Collections
• Method: GET /<db>
• Response: A JSON array of strings, where each
string is the name of a collection in the db.
• Example Request:
• GET /demo
• [“users",“inventory"]
29

Create a Collection
• Method: POST /<db>
• POST Data: A JSON document that describes the collection (table) to be
created. At a minimum this document must contain the field 'name',
which is the collection's name.
• Example Request:
POST /demo
{name:"bar"}
{"msg":"created collection demo.bar","ok":true}
• Explicit creation of a collection is not necessary. If a request for a
collection that does not exist is made, it will automatically be created
using reasonable default values. This was done to simplify programming.
30

Delete a Collection
• Method: DELETE /<db>/<collection>
• Response: A JSON document describing the
namespace that was dropped and the status.
• Example Request: DELETE /demo/bar
{"msg":"dropped
collection","ns":"demo.bar","ok":
true}
31

Query Example
• Get all documents from the namespace test.people (db=test, collection=people)
GET /test/people
• Example Result
[{"_id":{"$oid":"533501be27784337861702c5"},"name":"lance"},
{"_id":{"$oid":"533501c227784337861702c6"},"name":"brian"},
{"_id":{"$oid":"533501c627784337861702c7"},"name":"erika"}]
• The result is a JSON array of documents.
• In this example, each document has two fields: _id and name
• The _id has a value of a complex type ObjectId, which is transmitted as a sub-
document with the field $oid
• The name field has a simple JSON string as the value
32

Query Example
• Query with condition:
– Get all documents from the namespace test.users (db=test, collection=users)
whose age > 30.
– Also sort the results by age and filter the fields in the response
GET /test/users?query={age:{$gt:30}}&sort={age:1}
&fields:{firstName:1, age:1, _id:0}
• Example Result
[{"firstName":"Sherry","age":31},
{"firstName":"John","age":31},
{"firstName":"Bob","age":47},
{"firstName":"Larry","age":49}]
?sort={age:1}&fields={_id:0,lastName:0}
33

Insert Example
• Insert a single document
– POST to collection namespace, providing your JSON document to insert in the
data of the HTTP request
POST /test/users
Data:
{firstName:"John",lastName:"Doe",age:31}
Response:
{"n":1, "ok":true}
• To insert multiple documents:
– POST to collection namespace, providing a array of JSON documents to insert
in the data of the HTTP request. The response will indicate the number of
documents inserted: {"n":4, "ok":true}
34

Update Example
• Update a document
– Send a PUT to a collection namespace, providing your
query condition in the URL and the update operation
in the data of the HTTP request
PUT /test/users?query={firstName:“Larry”}
Data:
{"$set": {age : 25}}
Response:
{"n":1, "ok":true}
35

Delete Example
• Delete a document
– Send a DELETE request to a collection namespace,
providing your query condition in the URL
DELETE /test/users?query={name:“Larry”}
Response:
{"n":1, "ok":true}
36

HTTP Query Parameters
• HTTP supports parameters in the URL
• Parameters start after the '?' symbol and are are key=value pairs delimited by the
'&' symbol
• Example:
GET /demo/people?a=b&c=d
• Basic HTTP Query Parameters
– query
– fields
– sort
• Advanced HTTP Query Parameters
– limit
– skip
– batchSize , cursorId (uses HTTP request/response header)
37

Basic HTTP Query Parameters
• query
– The value assigned to this parameter should be a JSON document that defines the query to be
performed. The document uses the Mongo NoSQL syntax.
• fields
– The value assigned to this parameter should be a JSON document that specifies the fields to
include in the documents returned. This is the NoSQL (Mongo) equivalent of the SQL
projection clause. The fields of this document have values of 1 or 0 to indicate if the field
should be included in the result or not, respectively. For example, to include the field name
and exclude the field id, the document should be {_id:0,name:1}
• sort
– The value assigned to this parameter should be a JSON document that specifies the field(s) to
sort the result with. The fields of this document have values of 1 or -1 to indicate if the field
should be used to sort ascending or descending, respectively. For example to sort by age
descending and name descending: {age:1,name:-1}
38

Advanced HTTP Query Parameters
• limit
– The value assigned to this parameter should be a positive integer that
specifies the maximum number of documents to return.
• skip
specifies the number of documents to skip at the start of the result set
returned by the query.
• batchSize
specifies the maximum number of documents to return in each
request to page more data from a cursor.
39

Paging Data
• The REST API supports the use of cursors to page data in small chunks
from the server to the client.
• By paging data in smaller chunks, the processor, memory and network
resource utilization of a query for a large number of rows can be reduced.
• A cursor is created to help page data from the server to a client in the
following scenarios:
• The number of rows in the response is greater than the batch size
specified by the user when performing the query
• The number of rows in the response is greater than the maximum number
of rows in a response specified in the listener configuration
• The size in bytes of the response is larger than the maximum response size
specified in the listener configuration
40

Paging Data
• When a cursor is available, an additional header is present in the HTTP response to a query.
• The name of the header is 'cursorId'
• To get more data from the cursor, send a GET request that includes the cursorId from the response
in the request headers.
• As long as the cursorId header is present in responses to get more data from a cursor, additional
requests to retrieve more data from the cursor can be sent.
• When the cursorId is no longer present in the response, there is no more data available.
• The value of the cursor ID is of type long.
• This feature is particularly useful with frameworks such as dojo and jquery that support
asynchronous data sources.
• The ability to repeatedly return to the same session using cookies is critical to the operation of
cursors. A cursor is owned by a session. Cursors cannot be shared betweens sessions.
41

Command Example
• You can also use the REST API to run commands
– Run a GET request against the pseudo “$cmd” collection in your database and
specify the command document as the query condition in the URL.
– Command documents are based on the Mongo DB command syntax
• Example: Get the collection statistics about the “users” collection.
GET /test/$cmd?query={collStats:“users”}
Response:
[{"ns":“store_demo.users", "count":1000,
"size":322065, "avgObjSize":322,
"storageSize":323584, "numExtents":158,
"nindexes":1, "lastExtentSize":2048,
"paddingFactor":0, "flags":1,
"indexSizes":{"_id_":49152},
"totalIndexSize":49152, "ok":1}]
42

• You are able to do transaction work through the REST API by using the
transaction commands.
• To enable transactions for your session
GET /test/$cmd?query={transaction:“enable”}
– This binds your session id to a specific JDBC connection that will be kept exclusively for your
session until you disable transactions in your session. The REST listener will maintain your
session binding for you based on a cookie.
– Any operations that you run – POST, PUT, DELETE – will be in considered as a single transaction
until you run a REST request to commit or rollback the transaction.
• To commit a transaction
GET /test/$cmd?query={transaction:“commit”}
• To rollback a transaction
GET /test/$cmd?query={transaction:“rollback”}
• To disable transaction for your session
GET /test/$cmd?query={transaction:“disable”}
Transaction Example
43

Unified Data Access
• Objective: Provide unified access to the following
types of data:
– Relational Tables
– BSON Document Collections
– Time Series data
– Spatial Data
• The flexibility of JSON enables us to represent all
of the above as a JSON document collection.
44

Document Collection Access
• JSON documents are transformed into a BSON
representation and are stored in a column of a
relational table.
• Document collections accessed through the REST API
have the same capabilities as those accessed through
the MongoDB API.
• Indexes can be created on fields of the JSON/BSON
document using Informix functional indexes.
45

Relational Data Access
• The columns of a relational table are mapped to the fields of a JSON
document.
• MongoDB API calls can be run on relational tables as though the tables
were document collections. For example, the same call to create an index
on a field of a document would create an index on a column of the same
name.
• All basic operations available with document collections (insert, update,
delete, query) can be used without modification against a relational table.
– Story: We had a user, who was using a collection, create a relational table that had the same name as the
collection and had columns with corresponding data types and names as the fields in the document. The
application worked without modification.
• Informix row types are represented as sub-documents.
46

Timeseries Data Access
• Informix time series data is stored in a way that is
similar to a column-store database.
• The present strategy is to use the Informix Virtual
Table Interface (VTI) to make the TimeSeries data
appear to be a relational table.
• This virtual table can then be accessed by the
REST API.
47

Spatial Data Access
• Spatial data can be
inserted into a
document collection
using the GeoJSON
specification.
• Informix functional
indexes enable users
to efficiently query
spatial data.
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [125.6, 10.1]
},
"properties": {
"name": "Dinagat Islands" }
}
48

Stored Procedures via REST
• Coming in 12.10xC7
• New commands supported in both REST and MongoDB protocols
– “runProcedure”, “runFunction”
• Takes in the procedure name and an array of arguments
• Always returns a response for success/failure
– { “ok” : 1.0 } for success
• Can return data from the procedure
– Stored in JSON as “returnValue”
– Can include one or more rows/columns
50

Stored Procedures via REST
Call procedure with arguments and no return value:
GET http://localhost:27018/spdb/$cmd?query={"runProcedure":"increase_price",
"arguments":[101, 10]}
Response: [{"ok":1.0}]
Call function that returns a single value:
GET http://localhost:27018/spdb/$cmd?query={"runFunction":"add_values",
"arguments":[3,6]}
Response: [{"returnValue":9,"ok":1.0}]
Call procedure that returns multiple row (using WITH RESUME):
GET http://localhost:27018/spdb/$cmd?query={runProcedure:"colors_list"}
Response:
[{"returnValue":[{"color":"Red","hex":"FF0000"},{"color":"Blue","hex":"0000A0"},{"color":"White",
"hex":"FFFFFF"}],"ok":1.0}]
51

Compression in REST
• Wire Listener now supports compression HTTP
Headers
– deflate, gzip as encoding types
– Can get 50% or better compression on JSON
objects
52

Compression HTTP Headers
• Accept-Encoding
– Sent by the client
– Tells server what encoding it can accept
• Accept
– Defines what types of content the client is able to accept
• Content-Encoding
– Sent back by the server
– Tells client what encoding the message is encoded with
• Content-Type
– Defines what the type of content the client is sending the server
53

Data Conversion in REST
• Wire Listener supports additional options
from JSON for sending/receiving data
– XML, BSON
• BSON can be used for smaller data transfers
– Content-Type: application/bson
• Avoids JSON/BSON conversion in Wire Listener
54

XML Data in REST
• Content-Type: application/xml
• Accept: application/xml
• Example: { a: [ {b:adam} , {c:25} ] }
55

Final Thoughts
• The fusion of:
– JSON documents
– Schema-free document collections
– NoSQL query syntax
– Unified data manipulation language
– RESTful API
• Enables Informix to provide a hybrid database solution that
is uniquely capable of simplifying application development,
reducing the time to market, and increasing the
opportunity to create compelling applications.
57

THANK YOU!
Questions or Comments?
58

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