Integrating an App with Amazon Web Services SimpleDB
“A Matter of Choices”
Presented by Mark Maslyn – [email protected]
Amazon Web Services Menu
Amazon Web Service Databases
• RDB (Relational Database)
• S3 (Large Object Database)
• SimpleDB (NoSQL Database)
Amazon SimpleDB
• NoSQL Database – Non Relational
• Distributed - Highly Scalable, Highly Reliable, Incremental Writes
• Primarily for Database Reads
• RESTful Calls Passing Credentials and Query
• Very Low Cost – First 25 Hours Free Each Month.
SimpleDB Language Support
Whoa… Non – Relational ???
From WikiMedia Commons
NoSQL Databases• Use “Domains” Instead of “Tables”• Don’t Have Fixed Schemas – Easily Add or
Remove Columns• Variable Number of Fields per Record (Row)• Each Record is a List of Name / Value Pairs• Everything is a String• Record Indexed By A Unique Item ID• Implements Most SQL Calls• Maintained By Amazon Web Services
Android to Amazon Database Model
Android Phone
For UI and Display
Amazon SimpleDB Cloud
For Database Heavy Lifting
Data Request
Data Response
Each Does What It Does Best !
Images From HTC and WikiMedia
Remote Database Example: Kooaba
From www.kooaba.com
Kooaba Architecture
From www.kooaba.com
My Application – Oil Well Information
• Location (Latitude / Longitude)
• Well Status
• Land Survey Boundaries
• Must Have the Ability to “Drill Down” for More Information
Drilling For Oil
Amount of Data Generated Depends On How Deep the Well is Drilled
A
B
C
D
Example NoSQL Row For Geologic Formation Names and Depths
Item
Key
“05-10123”, “BLAINE”, “1464”,”ATOKA”,”4744”,”MORROW”,”4854”
Name3Name2Name1 Value1 Value2 Value3
Coding the ConnectionFrom Android
Image From http://www.vpnchoice.com/blog/wp-content/uploads/2011/06/android-vpn-300x187.jpg
Connecting to Amazon SimpleDB
private static AmazonSimpleDB sdb = null;
public static AmazonSimpleDB getInstance() {
if ( sdb == null ) { // pass in the authenication credentials
sdb = new AmazonSimpleDBClient( AWSDemo.credentials );
// set the node we want to use sdb.setEndpoint("sdb.us-west-1.amazonaws.com"); }
return sdb;}
Creating SimpleDB Domains From Android
public void createDomain(String domainName) { sdb.createDomain(new CreateDomainRequest(domainName));}
Inserting Records From Android
// each row is keyed with a “replaceable” item id followed by // attributes i.e. name / value pairs
// construct a list of items to be insertedList<ReplaceableItem> dataList = new ArrayList<ReplaceableItem>();
// populate the list using the item id and the attribute name / value pairsdataList.add(new ReplaceableItem(“05-123”).withAttributes( new ReplaceableAttribute(DBFields.STATE, “CO”, true), new ReplaceableAttribute(DBFields.COUNTY, “Weld”, true), new ReplaceableAttribute(DBFields.DRILLING_DATE, “05-11-2011”, true));
// batch insert the list into the SimpleDB database
sdb.batchPutAttributes(new BatchPutAttributesRequest(“my_domain”, dataList ));
Retrieving Data From Amazon
// build your SQL select statementString selectExpression = "select * from " + domain + " where itemName() = '“05-123’”;
// construct a select requestSelectRequest selectRequest = new SelectRequest(selectExpression);
// retrieve a list of matching items (records)List<Item> itemList = sdb.select(selectRequest).getItems();
// loop through each record and extract the attributes from each itemfor (int i = 0; i < itemList.size(); i++){ Item item = (Item) itemList.get(i); ArrayList<Attribute> attributeList = (ArrayList<Attribute>) item.getAttributes();}
Question:
Since Android Devices Can Use the Internal SQLite Database…
When I Would I Use the Internal Database and When Would I Use the
Amazon Cloud Database ?
It Depends On…
• Size of Your Database – Size Does Matter
• APK Maximum of 30 MB – Cloud Unlimited
• Whether the Data is Static or Subject to Change
• Whether You Need an Internet Connection For Access
• Whether You Require Authentication
My Choices: Local vs. Remote
Android SQLite Database
100,000 Colorado WellsLatitude
Longitude
Status Value
4 MB
54 Colorado CountiesLand Survey Information
12 MB
Amazon SimpleDB
100,000 Colorado WellsDetailed Well Information
21 MB
LOCAL REMOTE
Locally Stored Data
• Well Type / Location• Land Grid
• Authentication as part of RESTful Model
• Drill Down – Provide More Detailed Information
• No Limit on Amount of Data Accessible
Internet (Remotely) Accessed Data
For Further Information
Amazon Web Services For SDK’s, Tutorials,
Case Studies and Sample Code :
http://aws.amazon.com
Mark Maslyn: [email protected]