CSV

CSV (Comma separated Text file) provides an easy way of storing simple tabular data. The sample csv file used in this example is hosted by USGS, the science organization which hosts latest earthquake information in CSV files online.

Follow the instructions below to create a data service using a sample CSV file as the data source.

1. Log on to the product's management console and select "Data Services -> Create" under the "Main" menu.

2. The Create Data Service page appears. Fill in the fields and click Next. The Data Service name is mandatory.

Info:
For more information on Advanced Configurations in creating data services, refer to section "Data Service Management -> Transaction Handling."

3. The Data Sources page appears. Click on the Add New Data Source link and add your Data Source details. Select the data source type as CSV.

For example,

Note:
We use a sample file hosted online but you can also use one in your local machine.

Column Separator Values

Single Character = "X" (X is any character), e.g. ","
Tab = "\t"
Space = "\s"
Any Unicode Character = "\uXXXX" (XXXX is the hexadecimal unicode value)

4. Click Save. The added data source page appears. You can edit or delete the Data Source. To proceed click "Next."

5. The Queries page appears.

Initially your service does not include any queries. Click on 'Add New Query' to add a new query, input/output mappings, events etc. to your Data Service. Enter query details according to the structure of the response you want.

In the following example, we have used Grouped By Element, Row Name and Row namespace.

For information on adding validations to input mappings in the query, if any, refer to section Input Validators.

6. Once a new query is added, it will be listed in the "Queries" window. For example,

You can edit or delete your query. To continue, click Next.

7. The Operations page appears. Click the Add new operation link to create an operation. Select a query to be executed when this operation is called.

Click Save once done. For example,

8. The operation will be listed in the operations page.

9. The Data Service configuration is done. Click Finish. (You can continue to add resources by clicking the Next button if you like)

10. You will be navigated to the "Deployed services" page.

From here, you can manage your data service. For instructions, refer to section "Service Management."

For a demonstration on the usage of a CSV file as a data source in the WSO2 Data Services Server, refer to page CSV Sample in the Examples section of the WSO2 Data Services Server 2.6.3 documentation.