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Overview

Helium Rapid version 1.57 introduces provides functionality to generate and download existing jasper reports directly to a user's machine using normal actions that are triggered by buttons, view actions, widget actions etc.

This is only available for reports that are available in the jasper-reports folder of the app source code.

To trigger a report download from an action, the following is required:

• A call to the Mez:downloadReport built-in function
• A submission of the view to Helium's backed. This is done automatically when a DSL_VIEW value or null is returned from the actions function.
• Upon the next view response, as a result from the above, the download will trigger.

Note that multiple downloads cannot currently be queued. So even if Mez:downloadReport is called multiple times before returning from the action function, only the last download request will be triggered on the user's browser.

In addition to directly downloading a report, a blob can be generated from a report using the Mez:generateReport. This can then be stored and downloaded at a later stage.

Mez:downloadReport

The Mez:downloadReport built-in function can be called as follows:

Mez:downloadReport(DSL_REPORTS.My_Report_Reference, reportArguments, DSL_REPORT_FORMAT.Pdf, optionalFilename)

The arguments specified here are described in the following sections.

Report Reference

The DSL_REPORTS enum is a new built-in enum provided with Helium Rapid. The values for this enum represents the report within the jasper-reports folder of the app source code.

The values for the enum is derived from the value for the "referenceName" field specified in each report's report.json file.

The values are derived by replacing all spaces with underscores. No underscores are allowed in the value for the "referenceName" field in report.json.

In addition the converted values need to be unique per app and should conform to the normal syntax rules for enums in the DSL.

Consider the following example report.json file:

{
	"name":"All Farmer Purchases",
	"referenceName":"All the Farmer Purchases",
	"actionsDisplay":"close",
	"actionsLabel":"Menu",
	"description":"All farmer purchases system wide",
	"rolesAllowed":["System Admin"]
}

Based on the above report.json the following value will be available in the app:

DSL_REPORTS.All_the_Farmer_Purchases

Report Arguments

The report arguments represent values for the parameters specified in the report.json file for the report.

The key for the argument needs to match the parameter name specified in the report.json file.

In addition the type of the specified argument value should match the type specified in the report.json file. If not, a ProgramException will be thrown by Helium. These exceptions can be handled using the standard try catch functionality available in the DSL.

Consider the following example:

{
	"name":"Your Purchases",
	"referenceName":"Your Purchases",
	"description":"Your purchases",
	"rolesAllowed":["Farmer"],
	"parameters":[
		{
			"parameterName":"startDate",
			"type":"date",
			...
		},
		{
			"parameterName":"endDate",
			"type":"date",
			...
		},
		{
			"parameterName":"shopId",
			"type":"uuid",
			...
		},
		{
			"parameterName":"minCost",
			"type":"string"
			...
		}
	]
}

string downloadPurchases() {
    date startDate = Date:addDays(Mez:now(), -7);
    date endDate = Date:addDays(Mez:now(), 1);
    int minPurchaseAmout = 0;
    uuid shopId = shop._id;

    json args = "{}";
    args.jsonPut("startDate", startDate);
    args.jsonPut("endDate", endDate);
    args.jsonPut("shopId", shopId);
    args.jsonPut("minCost", minPurchaseAmout);

    Mez:downloadReport(DSL_REPORTS.Your_Purchases, args, DSL_REPORT_FORMAT.Pdf);

    return null;
}

Report Format

The file format for the report download. DSL_REPORTS_FORMAT is a new built-in enum that is available to all apps. The available values are as follows:

• DSL_REPORTS_FORMAT.Pdf
• DSL_REPORTS_FORMAT.Xls

Optional File Name

Report Privileges

The same access restriction for report display / rendering applies to report downloads from DSL code. 

If "rolesAllowed" is specified in the report's report.json file, those access restrictions will also apply to the Mez:downloadReport built-in function.

If Mez:downloadReport is called from the context of a user who does not have access to the report, a ProgramException will be thrown. These exceptions can be handled using the standard try catch functionality available in the DSL.

Exception Handling

In general, the built-in exception handling provided by the DSL's try catch mechanism can be used to handle exceptions with report generation.

At present, though, SQL exceptions that result from the report's queries cannot be handled in the same way.

Mez:generateReport

Another option for downloading a report is to use Mez:generateReport first to generate a blob representing the rendered report content and to then download the resulting blob at a later stage using some of the existing file download functionality in Helium Rapid such as the file browser widget.

The Mez:generateReport built-in function is similar to Mez:downloadReport with the following exceptions:

• Mez:generateReport does not apply any role restrictions for the report. Blobs can be generated from the context of any user or even scheduled functions.
• Mez:generateReport will not trigger a download on the frontend as Mez:downloadReport  does
• Mez:genreateReport returns a result containing the report blob and meta data whereas Mez:downloadReport does not return anything

Example

<table title="table_title.recent_purchases" csvExport="disabled" cols-md="6">
	    <collectionSource function="getAllShops" />
	    <searchEnabled function="showSearchOnRecentPurchasesShops"/>
	    <column heading="column_heading.shop">
		<attributeName>name</attributeName>
	    </column>
			
	    <rowAction label="button.download_recent_purchases" action="downloadPurchases">
		<binding variable="shop" />
	    </rowAction>
	</table>

string downloadPurchases() {
    date startDate = Date:addDays(Mez:now(), -7);
    date endDate = Date:addDays(Mez:now(), 1);
    int minPurchaseAmout = 0;
    uuid shopId = shop._id;

    json args = "{}";
    args.jsonPut("startDate", startDate);
    args.jsonPut("endDate", endDate);
    args.jsonPut("shopId", shopId);
    args.jsonPut("minCost", minPurchaseAmout);
    Mez:downloadReport(DSL_REPORTS.Your_Purchases_1, args, DSL_REPORT_FORMAT.Pdf);
    return null;
}

View table and download result:

Your Purchases-2.pdf

Additional Mentions and References

Details on other features related to Jasper Reports can be found here:

• Lesson 13: Jasper Reports, E-mail Attachments
• Lesson 17: Jasper Reports (continued)