A dynamic list of name-value structures ExtendedProperty structures that specify private run-time data or attributes specific to the ODA data set. To read more about the site take a look at this blog. Both the data set element and the ODA driver can provide column definition and hints. The definition for both can be seen in the newDataSourceWizard and the designer data source connection properties in the manifest editor. There is a classpath property for the web service data source.
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Each property in a display group is treated as a top-level property, whose grouping is not visible, when it is accessed programmatically. In the latter case, parameter definitions are derived data and are not stored in the parameter definition. DataSetParam structure ParamBinding structure.
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In previous articles I covered the aggregation and the emitter frameworks see Related topics for links. But what is different about the ODA architecture is that several of the observed calls are actually factory calls, requiring the observer to create new objects that are themselves observers. At Factory time, these static extension-defined properties are passed to the ODA run-time driver as connection properties to open a data source.
The content of this element is specific and private to an ODA driver, whose designer tool can dynamically define and update them as appropriate. A dynamic list of name-value structures for specifying private data or attributes specific to the ODA connection.
The BIRT ODA extension point
Now let’s add a Hibernate ODA dataset. With the release of BIRT 2.
By writing an ODA that can retrieve data from a report document file, you can write reports against existing reports, opening a whole new set of possibilities for the open source BIRT, such as run-once data sets that you can reuse for multiple reports. There is a classpath property for the web service data source. For ease of segregating these driver-specific properties in the property sheet, one could define them within a propertyGroup element with a group display name like “Query Properties”.
If you followed all of the steps in the wizard, you already set most of the configuration items.
The BIRT ODA extension point
Its value is optional if the ODA extension ora only one type of data set. This task allows an application to use a report document as a temporary cache that contains all the bindings, expressions, and aggregations. What do I need to do to get Birt to recognize that class?
Some ODA drivers provide multiple named result sets from a single query. An extended data source that represents a connection that implements the Open Data Access ODA ooda to interact with an external data provider.
Let’s consider the runtime plug-in first.
The composite that is created calls the DataSourceWizardPage. At Factory time, these static extension-defined properties are passed in name-value pairs to the ODA driver as a query’s run-time properties.
ODA Data Source Element (Eclipse BIRT ROM Documentation)
This property identifies which named result set to access. It is responsible for opening the data connection to the data source. BIRT assumes that the data set implementation can provide it at run time. The IQuery method follows this same pattern of being both an observer and a factory.
This article walked you through the process of creating two plug-in projects—one for design time and one for runtime. Remember that editing a data source editor when you click a odz source in the BIRT editor does not call this same set of classes: Such grouping is purely for display in a property sheet. The factories must generate observers for data source connections, data set queries, parameters, and result sets see Figure 1.
It calls a separately defined property page. An ODA driver may statically define driver-specific data set query properties by defining the property element in the ODA data source extension point org. Let’s it be HbDataSet. On the next wizard page leave everything as it is, just press the Test Connection button to verify the connection is successful.
So far you have the Hibernate data source and data set defined. The inherited resultSet definition, if specified, is for this result set.