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Oracle® Fusion Middleware Data Modeling Guide for Oracle Business Intelligence Publisher
11g Release 1 (11.1.1)

Part Number E22258-02
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1 Using the Data Model Editor

This chapter describes the components and features supported by BI Publisher's data model editor.

This chapter includes the following sections:

1.1 What Is a Data Model?

A data model is an object that contains a set of instructions for BI Publisher to retrieve and structure data for a report. Data models reside as separate objects in the catalog.

At the very simplest, a data model can be one data set retrieved from a single data source (for example, the data returned from the columns in the employees table). A data model can also be complex, including parameters, triggers, and bursting definitions as well as multiple data sets.

To build a data model, you use the data model editor.

1.2 Components of a Data Model

A data model supports the following components:

1.3 Features of the Data Model Editor

Use the data model editor to combine data from multiple data sets from different data sources, such as SQL, Excel files, Web services, HTTP feeds, and other applications into a single XML data structure. Data sets can either be unrelated or a relationship can be established between them using a data link.

The data model editor enables you to perform the following tasks:

1.4 About the Data Source Options

BI Publisher supports a variety of data source types for creating data sets. These can be categorized into three general types:

The first type are data sets for which BI Publisher can retrieve metadata information from the source. For these data set types, the full range of data model editor functions is supported. These data set types are:

For the second type, BI Publisher can retrieve column names and data type information from the data source but it cannot process or structure the data. For these data set types, only a subset of the full range of data model editor functions is supported. These data set types are:

For the third type, BI Publisher retrieves data that has been generated and structured at the source and no additional modifications can be applied by the data model editor. These data set types are:

1.5 Process Overview for Creating a Data Model

Table 1-1 lists the process overview for creating a data model.

Table 1-1 Process of Creating a Data Model

Step Reference

Launch the Data Model Editor.

Section 1.6, "Launching the Data Model Editor"

Set properties for the data model. (Optional)

Section 1.8, "Setting Data Model Properties"

Create the data sets for the data model.

Chapter 2, "Creating Data Sets"

Define the data output structure. (Optional)

Chapter 3, "Structuring Data"

Define the parameters to pass to the query, and define lists of values for users to select parameter values. (Optional)

Section 4, "Adding Parameters and Lists of Values"

Define Event Triggers. (Optional)

Section 5.1, "About Triggers"

(Oracle Applications Only) Define Flexfields. (Optional)

Chapter 6, "Adding Flexfields"

Test your data model and add sample data.

Section 2.14, "Testing Data Models and Generating Sample Data"

Add a bursting definition. (Optional)

Chapter 7, "Adding Bursting Definitions"


1.6 Launching the Data Model Editor

Launch the Data Model Editor from the Home page or from the global header in one of the following ways:

To launch the Data Model Editor from the global header:

  1. Click New and then click Data Model to open the Data Model Editor.

To launch the Data Model Editor from the Home page:

  1. Under the Create region, click Data Model.

1.7 About the Data Model Editor Interface

Figure 1-1 shows the Properties pane of the data model editor interface.

Figure 1-1 Data Model Editor Interface

Data Model Editor interface

The Data Model Editor is designed with a component pane on the left and work pane on the right. Selecting a component on the left pane launches the appropriate fields for the component in the work area.

The toolbar, shown in Figure 1-2, provides the following functions:

Figure 1-2 Toolbar of Data Model Editor

Data Model Editor Toolbar

1.8 Setting Data Model Properties

Enter the following properties for the data model:

Description —  (Optional) The description that you enter here displays in the catalog. This description is translatable.

Default Data Source — Select the data source from the list. Data models can include multiple data sets from one or more data sources. The default data source you select here is presented as the default for each new data set you define. Select Refresh Data Source List to see any new data sources added since your session was initiated.

Oracle DB Default Package — If you define a query against an Oracle database, then you can include before or after data triggers (event triggers) in your data model. Event triggers make use of PL/SQL packages to execute RDBMS level functions. For data models that include event triggers or a PL/SQL group filter, you must enter a default PL/SQL package here. The package must exist on the default data source.

Database Fetch Size — Sets the number of rows fetched at a time through the JDBC connection. This value overrides the value set in the system properties. See "Setting Server Configuration Properties" in Oracle Fusion Middleware Administrator's Guide for Oracle Business Intelligence Publisher. If neither this value nor the server setting is defined, then a default value of 300 is used.

Enable Scalable Mode — Processing large data sets requires the use of large amounts of RAM. To prevent running out of memory, activate scalable mode for the data engine. In scalable mode, the data engine takes advantage of disk space when it processes the data.

Backup Data Source — If you have set up a backup database for this data source, select Enable Backup Connection to enable the option; then select when you want BI Publisher to use the backup.

Note:

This feature requires that a backup data source has been enabled for the selected data source. For more information see "About Backup Data Sources" in Oracle Fusion Middleware Administrator's Guide for Oracle Business Intelligence Publisher.

1.8.1 XML Output Options

These options define characteristics of the XML data structure. Note that any changes to these options can impact layouts that are built on the data model.

  • Include Parameter Tags — If you define parameters for your data model, select this box to include the parameter values in the XML output file. See Section 4, "Adding Parameters and Lists of Values" for information on adding parameters to your data model. Enable this option when you want to use the parameter value in the report.

  • Include Empty Tags for Null Elements — Select this box to include elements with null values in your output XML data. When you include a null element, then a requested element that contains no data in your data source is included in your XML output as an empty XML tag as follows: <ELEMENT_ID\>. For example, if the element MANAGER_ID contained no data and you chose to include null elements, it would appear in your data as follows: <MANAGER_ID />. If you do not select this option, no entry appears for MANAGER_ID.

  • Include Group List Tag — (This property is for 10g backward compatibility and Oracle Report migration.) Select this box to include the rowset tags in your output XML data. If you include the group list tags, then the group list appears as another hierarchy within your data.

  • XML Tag Display — Select whether to generate the XML data tags in upper case, in lower case, or to preserve the definition you supplied in the data structure.

1.8.2 Attachments to the Data Model

The Attachment region of the page displays data files that you have uploaded or attached to the data model.

1.8.2.1 Attaching Sample Data

After you build your data model, it is required that you attach a small, but representative set of sample data generated from your data model. The sample data is used by BI Publisher's layout editing tools. Using a small sample file helps improve performance during the layout design phase.

The Data Model Editor provides an option to generate and attach the sample data. See Section 2.14, "Testing Data Models and Generating Sample Data."

1.8.2.2 Attaching Schema

The Data Model Editor enables you to attach sample schema to the data model definition. The schema file is not used by BI Publisher, but can be attached for developer reference. The Data Model Editor does not support schema generation.

1.8.2.3 Data Files

If you have uploaded a local Microsoft Excel file as a data source for this report, the file displays here. Use the refresh button to refresh this file from the local source. For information on uploading an Excel file to use as a data source, see Section 2.7, "Creating a Data Set Using a Microsoft Excel File."

Figure 1-3 shows the Attachments region with sample data and data files attached:

Figure 1-3 Attachments Region with Attached Sample Data and Files

Attachments region