Zheng Tech Blog

When creating reports using BI Publisher, we could define parameters to dynamically get the proper data set as business needs. The parameters we created are like the "binding variables" put into the where condition of the SQL (Data Source). Please note the name of the parameter has to be the same. If the parameters are also the columns in our data source, it will be displayed in the template as a data attribute, for example, But in certain scenario, you want to display the input parameters as independent on the report. The reasons are: 1) If the user input for the parameters doesn't match in our database and there will no rows fetched. In this way, format will give you empty value. But at this moment, you still want to see the user input values from the report even there is no data rows. 2) If the user input parameter is not a binding variable in the where clause. For example, there is a user input parameter called "description" a...

This is the same post to  this post . It achieve the same result of PPR. This is used when somehow PPR in the table isn't working properly. For instance, you have a transaction process on the selected row in a table. You select the row in the table, and click the button which will perform the transaction process, but somehow the table isn't refreshed to the updated state of the row (even though you setup the PPR declaratively). But you alway could solve this programmatically. Here I posted the snapshot of the coding snippet. You can call setSelectedRow(getSelectedRowStr()) inside the actionListener of the button which will perform the custom transaction. Another scenario: if you have a called task flow to process some transaction on the table and upon return to the calling task flow, the user wants to see the transaction changes which were performed during the called task flow. The solution is you can add a method action in the calling task flow...

The code snippet is as follows:  DCBindingContainer bindings =  (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry(); DCIteratorBinding iter = bindings.findIteratorBinding("ReceiptsIterator"); iter.executeQuery(); Get the iterator through  DCIteratorBinding  

Application module is in the business service layer and is separated from user interface layer. The first thing to do is to get the bridge to business service from user interface - BindingContext. BindingContext bctx = BindingContext.getCurrentInstance(); And then; BindingContainer bc = bctx.getCurrentBindingEntry(); The method is get ApplicationModule is through "DCDataControl" by method: getApplicationModule (for any non-bc4j application, this method returns null). To get DCDataControl, you could use DBBindingContainer by "getDataControl". But look at the API instructions, "*** For internal framework use only *** Returns the DCApplciation object to which this form binding belongs." So this method is for Oracle internal developers only. The workaround on this is to use EL to reference the ApplicationModule bound to the UI page and use EL resolving to cast to application module type. To find the Data Control Name:     public static DCDataC...

Using EL references bindings declaratively in ADF should always be followed, but there always is room for you to argument your application behavior in your own code. Here I am summarizing to access page bindings programmatically. How to access Page Definitions/Binding Context/Binding Container? BindingContainer bc = BindingContext.getCurrent().getCurrentBindingsEntry(); How to access page bindings in the page definition? There are different types of bindings: attributeBinding, treeBinding, listBinding, actionBinding, methodBinding, etc The corresponding types of codings have only two types: controlBinding and operationBinding. It's easy to recognize here. ActionBinding and methodBinding reference some actions and custom methods which are supposed to be executed somehow, therefore goes into the type of OperationBinding because it has execute() function. Other bindings are belonging to the valueBinding type so controlBinding is used. The codings are: OperationBind...

Expression Language (EL) is widely used in ADF Binding to reference items in the Binding Context. In some scenario, direct use of EL reference isn't enough and manipulation of several EL references needed to accomplish the task. While you can always manipulate the logics in a manged bean, if you want to go with "declarative", here is why I am saying about. Varchar2 type in SQL format (database) is converted to String automatically, but Number type in SQL is converted to oracle.jbo.domain.Number format. EL inherit generic Java API and can only recognize java.lang.Number type. Therefore, if you have two EL binding references to two database Number attributes: #{bindings.NumberAtt1.inputValue} and {bindings.NumberAtt2.inputValue}. If you want to evaluate if the first number greater than the second number, you cannot use compareTo() method which is belongs to oracle.jbo.domain.Number and you cannot use #{A > B} because A or B is not java.lang.Number A simple conversi...

We should use view object and related view criteria or bind variable to get any values from the database. Even though it is not recommended in many reasons, you still could try this way if the query is simple and trying to get a single value from the query. In your application module implementation file, you could use getDBTransaction().createStatement() method to execute a sql query at run time. Note there are three SQL statement types available in the DBTransaction interface: statement, callableStatement and preparedStatement. Here is the snippet of coding in your application module file: