Urgent!! How to publish a session Info Object once and pass it to sevaral forms

Question

Hi , I am using JDev 3.1. I have this problem when i create several forms in Jdev, where the wizard adds a sessionInfo object for each form. It also publishes them on the Infobus every time the form is called.I tried to use 1 marster sessionInfo Object from a marster form publish it there and then pass it to the other forms, but then the rowsets don't work propally. I f any one has any ideas please post as soon as possible.

Answer 1

We do have a FAQ, and the topic is part of the FAQ. Unfortunately, it seems that the FAQ is not yet available on OTN. In the meantime, I'll post some of the content here which may be useful:
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Q
How do I share database information across multiple Frames?
A
This describes using a SDI with multiple frames that share common database information (for example, a master-detail application
based on Dept-Emp where Dept information is dispayed in one frame, and Emp in another). For help in constructing an MDI
application, please refer to the JDeveloper documentation.
1.Create an empty project
2.Add a class to this project (this class will contain the SessionInfo, RowSetInfo, AttributeInfo)
3.Switch to Design mode for this class, and create the SessionInfo and RowSetInfos for your application by selecting the
appropriate object from the Component Palette, then clicking in the Structure Pane.
4.Set the properties of these objects as normal.
5.Create an Application with an empty Frame
6.In design mode, drop the desired controls into the Frame.
7.You can set all the properties for these controls as usual except for the properties that bind the control to a datasource. To bind
the controls to a datasource, switch to Source mode and add the appropriate code, for example:
textFieldControl1.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Deptno");
8.Repeat steps 6 and 7 for the second Frame.
9.Modify the Application to instantiate the class that contains the database information, and optionally to display the second
Frame (you may want to use a button on Frame1 that shows Frame2 instead).
Note that if you wish to access the methods of the database information objects programmatically, you may need to make the objects
public static.
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Also in regards to Ali's comment that executing all these queries when the app starts, you may be interested in the following:
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Q
How do I delay the execution of one or more queries?
A
By default, all queries being used by RowSetInfos in your application are executed when SessionInfo.PublishSession() is invoked.
There are two methods to potentially improve the performance of your DAC application if your queries return a large number of
rows.
1) As a workaround, you can dynamically alter the Where clause of your queries so that fewer rows (or no rows) are retrieved
initially. For example, include the condition 1=2 in the Where clause. Then, based on some interaction from the user, you can set a
"real" where clause condition. For information on dynamically altering the Where clause, see the appropriate FAQ.
2) A slighter cleaner method is to delay the association and subsequent publishing of the RowSetInfo until AFTER
SessionInfo.publishSession() is invoked. The following illustrates the order in which the key steps would be performed:
1.define the all RowSetInfo objects and their attributes
2.parent any RowSetInfo whose queries should be executed immediately to the SessionInfo object
3.publish the SessionInfo
4.parent any RowSetInfo objects whose queries should be delayed to the SessionInfo object
5.when appropriate, publish the RowSetInfo using RowSetInfo.publishRowSet(true)
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And, finally, the above makes reference to a FAQ for how to dynamically set the where clause:
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Q
How do I dynamically alter the Where clause of a RowSet?
A
There are two ways to accomplish this task. You can either call the setWhereClauseCondition on the RowSet, or you can use bind
variables. Both of the samples below assume a TextField named textSearch in which the user has entered a search value.
void buttonSearch_actionPerformed(ActionEvent e) {
// Two ways of "refreshing" the RowSet with condition specified by user
// Note that both samples use AttributeInfo.getColumnName() to get the appropriate
// format of the column name which differs depending on whether the VO uses "Expert mode"
// Example using dynamically created condition
rowSetInfo1.setQueryCondition(NamerowSetInfo1.getColumnName() + " LIKE '" + textSearch.getText() + "%'");
// Example using bind variable in condition (Note that the VO and its associated views must use ? style parameters)
rowSetInfo1.setQueryCondition(NamerowSetInfo1.getColumnName() + " LIKE ?");
rowSetInfo1.setQueryConditionParams(new Object[] {textSearch.getText() + "%"});
// Execute the query in either case...
rowSetInfo1.executeQuery();
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I hope this helps!!!
-- Brian
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