JSON Mapping Sample

About the sample

A popular data format used with RESTful services is JSON. This sample contains a data service with JSON output mapping templates. Go to Using JSON with Data Services for details on how to use JSON templates for output mapping in a data service.

The service contains the following resources:

• Resource: "offices"
• Method: POST 
• Description: Lists all the offices in the database. When office information is printed, all the employees that belong to an office are also printed using a nested query, which refers to the employeesInOfficeSQL query.
  
  
• Resource: "boston_customers"
• Method: GET
• Description: Returns all the customers in Boston. 
  
  
• Resource: "employee/{employeeNumber}"
• Method: GET
• Description: Returns employee information for the given employee number.
  
  
• Resource: "employee"
• Method: POST
• Description: Insert a new employee to the database with the given information. 
  
  
• Resource: "employee" with batch request 
• Method: POST
• Description: Insert a set of new employees to the database with the given information.
  
  
• Resource: "employee"
• Method: PUT
• Description: Updates an existing user with new information. 
  
  
• Resource: "employee
• Method: GET
• Description: Retrieve an existing employee. 

Building the sample

The sample data service named JSONSample should be deployed using the instructions in Samples Setup.

Running the sample

The sample service can be run using any client that can do REST calls. For example, use tools such as cURL or Advanced REST Client Chrome browser extension. The HTTP header "Accept" should be set to "application/json" and also, if a JSON payload is sent to the server, the HTTP header "Content-Type" should be set to "application/json".

The HTTP requests sent for each of the resources using cURL would be as follows:

• "offices" (method=GET)

  curl -X GET -H "Accept: application/json" http://localhost:8280/services/samples/JSONSample/offices

• "boston_customers" (method=GET)

  curl -X GET -H "Accept: application/json" http://localhost:8280/services/samples/JSONSample/boston_customers

• "employee/{employeeNumber}" (method=GET)

  curl -X GET -H "Accept: application/json" http://localhost:8280/services/samples/JSONSample/employee/1002

• "employee" (method=POST) : A sample payload saved as the employee-payload.json file, that can be used when sending the data is given below.

  {
    "_postemployee": {
      "employeeNumber" : 14001,
      "lastName": "Smith",
      "firstName": "Will",
      "email": "will@google.com",
      "salary": 15500.0
    }
  }

  The HTTP request sent using CURL would be as follows:

  curl -X POST -H 'Accept: application/json'  -H 'Content-Type: application/json' --data "@employee-payload.json" http://localhost:8280/services/samples/JSONSample/employee

• "employee" (method=POST) with batch request : A sample payload saved as the employee-payload.json file, that can be used when sending the data is given below.

  Note that you need to enable batch requesting for the data service before proceeding:

  1. Log in to the management console of WSO2 EI using the following URL: https://localhost:9443/carbon.

  2. Select the JSONSample data service that is listed in the Services → List menu.
  3. Click Edit Data Service (Wizard) to open the wizard and select the Enable Batch Request check box.
  4. Click Next and save the changes.

  Batch requesting is now enabled for the data service.

  {
      "_postemployee_batch_req": {
          "_postemployee": [
              {
                  "employeeNumber": 5012,
                  "lastName": "Smith",
                  "firstName": "Will",
                  "email": "will@smith.com",
                  "salary": 13500.0
              },
              {
                  "employeeNumber": 5013,
                  "lastName": "Peter",
                  "firstName": "Parker",
                  "email": "peter@parker.com",
                  "salary": 15500.0
              }
          ]
      }
  }

  The HTTP request sent using CURL would be as follows:

  curl -X POST -H 'Accept: application/json'  -H 'Content-Type: application/json' --data "@employee-payload.json" http://localhost:8280/services/samples/JSONSample/employee_batch_req

• "employee" (method=PUT) -  A sample payload saved as the employee-payload-update.jsonfile, that can be used when sending the data is given below.

  {
    "_putemployee": {
      "employeeNumber" : 14001,
      "lastName": "Smith",
      "firstName": "Will",
      "email": "will@smith.com",
      "salary": 78500.0
    }
  }

  The HTTP request sent using CURL would be as follows:

  curl -X PUT -H 'Accept: application/json'  -H 'Content-Type: application/json' --data "@employee-payload-update.json" http://localhost:8280/services/samples/JSONSample/employee

• "employee" (method=GET)

  curl -X GET -H 'Accept: application/json'  http://localhost:8280/services/samples/JSONSample/employee/14001