File Data Sources

JasperReports Server 6.1 introduces file-based data sources. These data sources read a text file in JSON, XML, or XMLA format and allow you to query its contents as a relational table. The text file may be stored in the server's repository, in the server's file system, or accessed from a URL. This means you can create a data source based on data retrieved from websites and even REST APIs.

By default file data sources do not appear in the New Data Source dialog and must be enabled first.

To enable file data sources in the UI:

1. Open the file applicationContext-remote-services.xml for editing.
2. Locate the element <util:set id="customDataSourcesToHide">.
3. Comment out the file data sources you want to display.

In the following example, the JSON and XML data sources are commented out so they appear in the drop-down menu in the New Data Source dialog:

<util:set id="customDataSourcesToHide">
    <value>xmlaQueryDataSource</value>
    <value>sparkQueryDataSource</value>
    <!-- value>remoteXmlDataSource</value -->
    <value>mongoDBQueryDataSource</value>
    <!-- value>jsonDataSource</value -->
    <value>jdbcQueryDataSource</value>
    <value>cassandraQueryDataSource</value>
</util:set>

After file data sources are enabled, you can create a file data source.

In order to upload a JSON file to the JasperReports Server repository, you must save it with the .xml extension on your computer. Then create an XML file resource and select your JSON.xml file. Give your resource a name such as MyDataFile_JSON so you can find it. The repository calls it an XML file, but the data source can interpret the JSON contents.

To create a file data source:

1. Log on as an administrator.
2. Click View > Repository, expand the folder tree, and right-click a folder to select Add Resource > Data Source from the context menu. Alternatively, you can select Create > Data Source from the main menu on any page and specify a folder location later. If you installed the sample data, the suggested folder is Data Sources. The New Data Source page appears.
3. In the Type field, select a file data source that you enabled, for example JSON Data Source or XML Data Source. In this example, we create a JSON data source. The fields on the page change to reflect what’s needed to define a file data source.

You have the option to use attributes in the values of data source parameters. See Attributes in Data Source Definitions.

File Data Source Page for a JSON Data Source

4. Enter the URI of the JSON file. You can specify a file in the repository with the repo: syntax, followed by the repository path of the file. Specify ftp:, http: or https: to use those Internet protocols. To specify a file on your server's file system, specify its path directly, starting from the root, for example /tmp/MyDataFile.json. The user running the server process must have permission to access the file.
5. You can specify a optional query to limit or select the data accessible through the data source. The query has the following syntax:

<tableName> or <tableName>/<fieldName>

where:

<tableName> corresponds to an XML element or JSON structure name

<fieldName> corresponds to an XML sub-element or JSON field name

6. Click Save. The Save dialog appears.
7. Enter a name for the data source and an optional description. The Resource ID is generated from the name you enter. If you haven't already specified a location, expand the folder tree and select the location for your data source.
8. Click Save in the dialog. The data source appears in the repository.

Once you have defined a file data source for your XML or JSON file:

You can use SQL queries in reports to access the data as a relational table.
You can create a Domain on a file data source, allowing you to alter the visibility and names of the fields extracted from the file. On the Display tab of the Domain Designer you can also specify which fields are measures.
You can create Ad Hoc views using the Domain based on your file data source, allowing you to explore and interact with data from the file.
You can create virtual data sources that combine several file data sources, even different file formats such as XML an JSON, as long as their data structure is compatible so the tables can be joined. You can then create a Domain based on the virtual data source to join the tables and access the joined data in Ad Hoc views and reports.
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