NoSQL (Not Only SQL) is growing beside a RDB (Relational database). For example, DynamoDB for Amazon, BigTable for Google, Apollo for Facebook, and so forth. MongoDB is the one of most popular NoSQL DB.

Overview

• It is said to be “Documente Oriented”, and they call table as “Collection”.
• Unlike RDB, it does not support JOIN.
• It Supports an ARRAY in a single record (document).
• The format looks like JSON object. Therefore, it is good to use with Web Service.
• Mongo DB is written in C++

This example is Spring MVC with CRUD operation by Mongo DB to demonstrate Web Service. And here is the configuration:

<!-- Mongo DB -->
<dependency>
	<groupId>org.springframework.data</groupId>
	<artifactId>spring-data-mongodb</artifactId>
	<version>1.5.2.RELEASE</version>
</dependency>
<dependency>
	<groupId>org.mongodb</groupId>
	<artifactId>mongo-java-driver</artifactId>
	<version>2.12.4</version>
</dependency>

<dependency>
	<groupId>com.drewnoakes</groupId>
	<artifactId>metadata-extractor</artifactId>
	<version>2.4.0-beta-1</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>ns2015mvcmongo001</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

    <servlet>
        <servlet-name>ns2015</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>ns2015</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

NOTE: At line 16 of web.xml, servlet-name is specified as ns2015. Therefore, servlet context file will be “ns2015-servlet.xml“.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mongo="http://www.springframework.org/schema/data/mongo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.5.xsd">

	<context:component-scan base-package="com.ns.spring" />
	 
	<!-- Configuration defining views files -->	 
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	    <property name="prefix">
	        <value>/WEB-INF/jsp/</value>
	    </property>
	    <property name="suffix">
	        <value>.jsp</value>
	    </property>
	</bean>
	 
	<!-- Factory bean that creates the Mongo instance -->
	<bean id="mongo" class="org.springframework.data.mongodb.core.MongoFactoryBean">
	    <property name="host" value="localhost" />
	</bean>
	 
	<!-- MongoTemplate for connecting and quering the documents in the database -->
	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
	     <constructor-arg name="mongo" ref="mongo" />
	     <constructor-arg name="databaseName" value="nsdb" />
	</bean>

	<!-- To scan sub interface for MongoRepository -->
	<mongo:repositories base-package="com.ns.spring" />
</beans>