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Add cascading parameters to a paginated report (Report Builder)

  • Άρθρο

Applies to:  Microsoft Report Builder (SSRS)  Power BI Report Builder  Report Designer in SQL Server Data Tools

Cascading parameters provide a way of managing large amounts of data in a paginated report. You can define a set of related parameters so that the list of values for one parameter depends on the value chosen in another parameter. For example, the first parameter is independent and might present a list of product categories. When the user selects a category, the second parameter is dependent on the value of the first parameter. Its values are updated with a list of subcategories within the chosen category. When the user views the report, the values for both the category and subcategory parameters are used to filter report data.

Note

You can create and modify paginated report definition (.rdl) files in Microsoft Report Builder, Power BI Report Builder, and in Report Designer in SQL Server Data Tools.

To create cascading parameters, you define the dataset query first and include a query parameter for each cascading parameter that you need. You must also create a separate dataset for each cascading parameter to provide available values. For more information, see Add, change, or delete available values for a report parameter (Report Builder).

Order is important for cascading parameters because the dataset query for a parameter later in the list includes a reference to each parameter that is earlier in the list. At run time, the order of the parameters in the Report Data pane determines the order in which the parameter queries appear in the report. Therefore, the order in which a user chooses each successive parameter value.

For information about creating cascading parameters with multiple values and including the Select All feature, see How to have a select all multivalue cascading parameter.

  1. In the Report Data pane, right-click a data source, and then select Add Dataset.

  2. In Name, enter the name of the dataset.

  3. In Data source, choose the name of the data source or select New to create one.

  4. In Query type, choose the type of query for the selected data source. In this article, query type Text is assumed.

  5. In Query, enter the query to use to retrieve data for this report. The query must include the following parts:

    1. A list of data source fields. For example, in a Transact-SQL statement, the SELECT statement specifies a list of database column names from a given table or view.

    2. One query parameter for each cascading parameter. A query parameter limits the data retrieved from the data source by specifying certain values to include or exclude from the query. Typically, query parameters occur in a restriction clause in the query. For example, in a Transact-SQL SELECT statement, query parameters occur in the WHERE clause.

  6. Select Run (!). After you include query parameters and then run the query, report parameters that correspond to the query parameters are automatically created.

    Note

    The order of query parameters the first time you run a query determines the order that they are created in the report. To change the order, see Change the order of a report parameter (Report Builder)

  7. Select OK.

Next, create a dataset that provides the values for the independent parameter.

Create a dataset to provide values for an independent parameter

  1. In the Report Data pane, right-click a data source, and then select Add Dataset.

  2. In Name, enter the name of the dataset.

  3. In Data source, verify the name is the name of the data source you chose in step 1.

  4. In Query type, choose the type of query for the selected data source. In this article, query type Text is assumed.

  5. In Query, enter the query to use to retrieve values for this parameter. Queries for independent parameters typically don't contain query parameters. For example, to create a query for a parameter that provides all category values, you might use a Transact-SQL statement similar to the following block:

    SELECT DISTINCT <column name> FROM <table>

    The SELECT DISTINCT command removes duplicate values from the result set so that you get each unique value from the specified column in the specified table.

    Select Run (!). The result set shows the values that are available for this first parameter.

  6. Select OK.

Next, set the properties of the first parameter to use this dataset to populate its available values at run-time.

Set available values for a report parameter

  1. In the Report Data pane, in the Parameters folder, right-click the first parameter, and then select Parameter Properties.

  2. In Name, verify that the name of the parameter is correct.

  3. Select Available Values.

  4. Select Get values from a query. Three fields appear.

  5. In Dataset, from the list, select the name of the dataset you created in the previous procedure.

  6. In Value, select the name of the field that provides the parameter value.

  7. In Label, select the name of the field that provides the parameter label.

  8. Select OK.

Next, create a dataset that provides the values for a dependent parameter.

Create a dataset to provide values for a dependent parameter

  1. In the Report Data pane, right-click a data source, and then select Add Dataset.

  2. In Name, enter the name of the dataset.

  3. In Data source, verify the name is the name of the data source you chose in step 1.

  4. In Query type, choose the type of query for the selected data source. In this article, query type Text is assumed.

  5. In Query, enter the query to use to retrieve values for this parameter. Queries for dependent parameters typically include query parameters for each parameter that this parameter is dependent on. For example, you can create a query for a parameter that provides all subcategory (dependent parameter) values for a category (independent parameter). To do so, you might use a Transact-SQL statement similar to the following block:

    SELECT DISTINCT Subcategory FROM <table>   
WHERE (Category = @Category)

    In the WHERE clause, Category is the name of a field from <table> and @Category is a query parameter. This statement produces a list of subcategories for the category specified in @Category. At run time, this value is filled in with the value that the user chooses for the report parameter that has the same name.

  6. Select OK.

Next, set the properties of the second parameter to use this dataset to populate its available values at run time.

Set available values for the second parameter

  1. In the Report Data pane, in the Parameters folder, right-click the first parameter, and then select Parameter Properties.

  2. In Name, verify that the name of the parameter is correct.

  3. Select Available Values.

  4. Select Get values from a query.

  5. In Dataset, from the list, select the name of the dataset you created in the previous procedure.

  6. In Value, select the name of the field that provides the parameter value.

  7. In Label, select the name of the field that provides the parameter label.

  8. Select OK.

Test the cascading parameters

  1. Select Run.

  2. From the list for the first, independent parameter, choose a value.

    The report processor runs the dataset query for the next parameter and passes it the value you chose for the first parameter. The list for the second parameter is populated with the available values based on the first parameter value.

  3. From the list for the second, dependent parameter, choose a value.

    The report doesn't run automatically after you choose the last parameter so that you can change your choice.

  4. Select View Report. The report updates the display based on the parameters you chose.

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