Programming Against Hybrid Databases with Java Handling SQL and NoSQL. Brian Hughes IBM

Programming Against Hybrid

Databases with Java

Handling SQL and NoSQL

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• New Types

• Tables with NoSQL

• Mongo BSON Classes

• JDBC

– Demo database

– SQL and Strings

– New data types (BSON, JSON ???)

• Mongo-Java

New Type JSON

• JSON (Javascript object notation)

– A lightweight data-interchange format

– Easy to read and write

• Informix server has JSON data type

• JDBC driver has no special support for JSON

– Considered a text string from the driver

– Need 3

rd

_{party libraries to parse into usable}

New Type BSON

• BSON - a binary form for representing simple

data structures and associative arrays

– Short for Binary JSON

• BSON is efficient for data transfers, space and

traversability

• Most new Informix functions/functionality is

around supporting BSON

Tables with NoSQL

• Easy to add JSON/BSON types to existing or

new tables

• Create them as a normal columns

Mongo BSON Classes

• BasicBSONObject

– Base class for holding BSON data

– BSON/Java data can represented as Maps of objects

• Map<String, Object> specifically

– Extends LinkedHashMap

• BasicBSONList

– Represents arrays in BSON structures

– No real value

– Extends List<Object> so casting to a List works just fine

• BSONObject

Informix JDBC BSON

• Informix JDBC driver has bundled a number of BSON classes

– Subset of Mongo’s org.bson package

– Missing DBObject

Native Java Mapping

• Informix JDBC driver maps BSON objects

to the IfxBSONObject class

• IfxBSONObject is a hybrid class

– Holds both byte [] representation of a BSON

as well as the Mongo BasicBSONObject

Demo Database

• Basic Structure for JDBC

Demo Database (cont)

• A simple data with basic and NoSQL data

types

Handling NoSQL as Strings

• Using SQL casts we can treat our NoSQL

SQL Statement with NoSQL as Strings

• Final resulting string is difficult to read and

long

Querying Data as Strings

• Both JSON and BSON types can be viewed as

Strings

• JSON maps to a native Java String

Demo

Query Data with Native Types

• JSON is a String

• BSON comes back as an IfxBSONObject

– Informix JDBC UDT for the extended type BSON

IfxBSONObject

• A UDT, a BSONObject, and a SQLData object

• Allows for easy manipulation of BSON as well

Processing an IfxBSONObject

• For most operations, you can use the object directly

• Sometimes you might want to convert to a

Handling Complex BSON

Handling Complex BSON

Demo

Mongo Drivers

• If you work heavily in NoSQL you might prefer

the use of Mongo Drivers

• Requires the setup of the Informix Wire

Listener to understand Mongo protocols

Index Creation on BSON

• Creating indexes on BSON documents in a

collection is easy

• Basic Mongo create index

–

Checking for Indices used

• Mongo API has an explain() method

Getting Relational data from Mongo

API’s

Execute Complex SQL via Mongo API’s

• Using SQL pass through you can execute pure

SQL via the Mongo API’s

– secure.sql.passthrough=true

Demo