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Exposing a Mongo Datasource

This example demonstrates how Mongo data can be exposed as a data service.

Prerequisites

Let's create a simple Mongo database that stores employee information.

1. Download and set up a MongoDB server.

2. Use the following commands to create the database.

   mongo
   use employeesdb
   db.createCollection("employees")
   db.things.insert( { id: 1, name: "Document1" } )
   db.employees.insert( { id: 1, name: "Sam" } )
   db.employees.insert( { id: 2, name: "Mark" } )
   db.employees.insert( { id: 3, name: "Steve" } )
   db.employees.insert( { id: 4, name: "Jack" } )

Synapse configuration

Given below is the data service configuration you need to build. See the instructions on how to build and run this example.

<data name="MongoDB" transports="http https local">
   <config enableOData="false" id="MongoDB">
      <property name="mongoDB_servers">localhost</property>
      <property name="mongoDB_database">employeesdb</property>
      <property name="mongoDB_read_preference">PRIMARY</property>
   </config>
   <query id="mongo_insert" useConfig="MongoDB">
      <expression>employees.insert("{id:#, name:#}")</expression>
      <param name="id" optional="false" sqlType="INTEGER"/>
      <param name="name" optional="false" sqlType="STRING"/>
   </query>
   <query id="mongo_find" useConfig="MongoDB">
      <expression>employees.find()</expression>
      <result element="Documents" rowName="Document">
         <element column="document" name="Data" xsdType="string"/>
      </result>
    </query>
   <operation name="mongo_insert_op">
      <call-query href="mongo_insert">
         <with-param name="id" query-param="id"/>
         <with-param name="name" query-param="name"/>
      </call-query>
   </operation>
   <operation name="mongo_find_op">
      <call-query href="mongo_find"/>
   </operation>
   <resource method="POST" path="insert/{id}">
      <call-query href="mongo_insert">
         <with-param name="id" query-param="id"/>
         <with-param name="name" query-param="name"/>
      </call-query>
   </resource>
   <resource method="GET" path="find">
      <call-query href="mongo_find"/>
   </resource>
</data>

Build and run

Create the artifacts:

1. Set up ESB Integration Studio. The path to this folder is referred to as MI_TOOLING_HOME throughout this tutorial.
2. Create a Data Service project.
3. Create the data service with the configurations given above.
4. Deploy the artifacts in your Micro Integrator.

Let's try out this sample by invoking the find resource in the data service to GET data. Shown below is the curl command to send the GET request:

curl -X GET http://localhost:8290/services/MongoDB/find

This generates a response as follows.

<Documents xmlns="http://ws.wso2.org/dataservice">
  <Document>
    <Data>{ "_id" : { "$oid" : "5fd21a7dc9b921afa1c9b83c"} , "id" : 1.0 , "name" : "Sam"}</Data>
  </Document>
  <Document>
    <Data>{ "_id" : { "$oid" : "5fd21a87c9b921afa1c9b83d"} , "id" : 2.0 , "name" : "Mark"}</Data>
  </Document>
  <Document>
    <Data>{ "_id" : { "$oid" : "5fd21a90c9b921afa1c9b83e"} , "id" : 3.0 , "name" : "Steve"}</Data>
  </Document>
  <Document>
    <Data>{ "_id" : { "$oid" : "5fd21a9fc9b921afa1c9b83f"} , "id" : 4.0 , "name" : "Jack"}</Data>
  </Document>
</Documents>

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