data binding

By this point, you might have forgotten that you're reading an article in a series about data binding.

And like those other terms, data binding is often defined incorrectly.

First, it's easy to tightly couple your data binding code to the endpoint that you control.

Essentially, data binding is an automatic way of setting any run-time accessible property of any control on a form.

When you control one endpoint, you still write the interface into and out of your data binding as if you don't control either endpoint.

Experiment with using SQL and XML data binding in the same application to understand how the same sort of mapping paradigm is used for both.

So if you wish not to use external mapping file then annotations can be used for your data binding needs.

The fact that you're reading this column tells me that you're at least mildly interested in XML data binding.

Most controls perform data binding automatically, which means that you typically do not need to call this method explicitly.

The sort of problems you should watch out for when choosing, and then using, a data binding package.

Initially released in December 1999, Castor JDO was one of the first open source data binding frameworks available.

That makes it a great lightweight data-binding option in your XML programming.

Look at the simplest SQL data binding task: mapping an object that doesn't refer to any other objects to a single table.

Traditionally, data binding has been used within applications to take advantage of data stored in databases.

Data binding allows you to directly map between the Java objects and XML, without having to deal with XML attributes and elements.

You can use data binding in a Web test to let a database serve as the source for the user inputs to the HTTP request in the Web test.

This allows any data-binding expressions the page developer may have associated with your data-bound server control to be evaluated.

Typically used in complex data-binding scenarios, the Filter property allows you to view a subset of the DataSource.

The external mapping file configuration gives developer lot of flexibility as well in terms of data binding needs.

That's because when it comes to Castor, XML data binding is just a part of the puzzle.

It's possible that some of you are seeing the light here, but are stuck with a particular data binding API or implementation.

Data binding support that allows the nodes of the control to be bound to XML, tabular, or relational data.

NET in this chapter, you'll be ready to explore the timesaving shortcuts of the data binding model in Chapter 16 and Chapter 17.

Data binding that allows the nodes of the control to be bound to XML, tabular, or relational data.

JBind can also be used for conventional data binding, and I use it in this manner for the performance tests reported in Part 2.

Actually, it has been bashed by many, as it advocates a solution of simply data-binding of view component state directly into the model.

You would typically suspend data binding if the user must be allowed to make several edits to data fields before validation occurs.

Data binding is the term used for techniques that handle this conversion between XML and application data structures.

With all these steps complete, you're ready to do some data binding.

Custom Data Binding allows you to hide this logic below the interface level and present a more application-centric API.

This control information pads the size of the objects, reducing one of the main benefits of data binding.

The Initialize method is usually called during data binding, prior to the first row being bound.

During data binding, each field is bound to its corresponding property.

Data binding allows you to map specific component values to an existing data structure, without the need for extra programming.

Data-binding expressions are resolved when the DataBind method of a control or of the Page class is called.

It's also a critical part of the data binding framework -- remember that the last section talked about round-tripping.

The size of the jar files used by the data binding framework is one major influence on this startup time.

You would typically suspend data binding if the user must be allowed to edit data fields before validation occurs.

To support this principle when marshalling, there has to be a way for the data binding framework to be invoked only when needed.

However, this turns out to be probably the single most important factor in making a good decision about your data binding approach.

Is commonly used in data-binding applications where a control exposes the contents of the underlying table as a view.

You could selectively expose data binding properties , and you could package and reuse the entire control from application to application .

In fact, all that data binding usually does, if operating correctly, is ensure that the data doesn't change.

That said, the data binding portion of the code base is stable and is used by many developers.

Though data binding is not the focus of this article, it's important to know of the multiple uses of the term.

NET developers are accustomed to the concept of data binding, but Crystal Reports uses report binding instead of data binding.

There's a sample screen shot below where the name of the data binding is CustomTransformerDataBindingImpl.

A few data binding frameworks (including JiBX) have implemented an alternative approach, generally called mapped binding.

Current web services stacks generally support flexible conversions between data models and XML, using some form of data binding.

In the last installment, Brett examined several important concepts in data binding, including round-tripping and semantic equivalence.

Properties to see how data binding is configured to display related records.

In looking at how the existing data binding frameworks operate, I saw two aspects that didn't look good from a performance standpoint.

For the purposes of this article, you will generate Data Binding classes required to run the PhoneBook application on IMS.

Any other data binding framework can be plugged in easily.

For mapped approaches to data binding, Castor has the advantage of a fairly stable implementation and substantial real-world usage.

The other data binding frameworks take about twice as long, with Quick the slowest of all (no pun intended, of course).

The following list shows a few of the most common scenarios that utilize data binding as the method of data presentation and manipulation.

Instead, the manipulation of the database occurs behind the scenes, and is the work of the data binding API.

JiBX data binding has long been known as the fastest and most flexible approach for binding Java code to XML.

When called on a server control, this method resolves all data-binding expressions in the server control and in any of its child controls.

In short, a good mapping system makes data binding useful in the real world, and not just a theoretical exercise.

How do the data binding approaches compare in the amount of memory used for the document representation?

This property is particularly important in differentiating server controls contained within a data- binding server control that repeats .

dom4j offers better performance than any of the data binding approaches in this area, beating JiBX by a smidgen and Zeus by not much more.

Data binding centers around XML and Java, so let's take a look at how these XML documents and Java classes relate to Quick.

In these cases, the approach to data binding that you've picked up so far won't get you very far.

Play around with SQL data binding and see if it helps your application (it almost certainly will).

SQL data binding might be a new term, but it's a pretty simple concept.

Four roles are involved with custom data binding and each role has its own set of responsibilities.

ASP. NET supports a data-binding architecture that enables Web server controls to bind to data and present it in a consistent fashion.

The possible property values are the same as for the Data Binding wizard, as shown in Figure 6.

After a page performs the first data-binding request, subsequent requests attempt to retrieve the data from view state.

The Data Binding class reads the native MQ message, parses it, and populates a business object of a previously defined type with that data.

A visual designer should use this attribute to determine whether to display a particular list in a data-binding picker.

The quality of a data binding API's round tripping capabilities is measured by how closely the input and output documents match up.

This event notifies the server control that any data binding logic written for it has completed.

In the J2C Java Bean Ant script, the input and output data binding files used for the methods are defined.

Are two methods that allow the temporary suspension and resumption of data binding in a simple-binding scenario.

Castor JDO is just one of many data-binding solutions available in the open source world today.

Implement a handler for your form's Load event that initializes the DataGridView and BindingSource and sets up the data binding.

In the next article in this series, you learn about another aspect of comparison for the Axis2 data-binding frameworks: performance.

You'll use the standard tag library along with Spring data binding to bind your data objects to the JSP views that you're going to create.

For performance tests of the data binding frameworks, I generated documents containing mock airline flight timetable information.

Windows Forms can take advantage of two types of data binding: simple binding and complex binding.

Just as Flex has data binding, AsWing has various data models that will automatically notify the view to update.

To resolve a data binding to either the property of an object or the property of the current object in a list of objects.

For an example that demonstrates best practices for reusing a client for multiple requests, see Data Binding in an ASP. NET Client.

Without support for these features, Zeus feels more like a trimmed-down document model than a full data binding framework.

Data binding requires a source property, a destination property, and a triggering event that.

In the next article, you'll push past simple XML data binding and examine the SQL data binding facilities of Castor.

This article focuses on that process -- known as marshalling in the data binding world -- and in particular JAXB's marshalling capabilities.

JAXB introduces the concept of data binding, a correspondence between XML schemas and Java classes.

Host controls enable you to do simple data binding or complex data binding.

Instead they went with an interface approach where different data binding frameworks could be used behind the scenes.

The data binding engine does not catch exceptions that are thrown by a user-supplied converter.

If the model doesn't have such a property, then the method fails by returning false and the data binding fails.

You can use the event parameters to access the data being used for data binding.

Then a data binding class will be added to parse the native data from URL into a business object.

JPA entities are a natural fit to be used as the data-binding model required for most JSF components.

In this article and the next, you'll learn about an alternative approach to data binding that uses XPath technology.

Additionally, since JAX-WS uses JAXB for all data binding purposes, the jaxrpc-mapping file is no longer necessary.

Unlike JAXB, there is no real need of providing annotations for your data binding needs.

As a result, you are not required to understand details of the page request lifecycle just to perform data binding.

In a variety of scenarios, particularly prototyping and RAD development, data binding is critical.

Invoking your control's base OnDataBinding method causes all data-binding expressions for the control to be evaluated.

A string that results from the evaluation of the data-binding expression and conversion to a string type.

You should add validation rules, extraction rules, and data binding to your Web test before you convert it to a coded Web test.

Figure 1 shows the class structure I used for mapped data binding to these documents.

Unlike most other data binding frameworks, JiBX supports using any number of binding definitions in combination.

Data binding is a connection between a control and a storage device or back - end database .

Data-binding properties could be selectively exposed, and the entire control could be packaged and reused from application to application.

In those cases, the only option is to use alternate data binding.

Stores and exposes information about data-binding and validation errors for a specific object.

XFire is another SOAP engine, which allows a choice of data binding frameworks to be used; XFire also claims excellent performance results.

Simple data binding enables applications to bind a control property to a single value in a database.

Like Axis2, but unlike Metro, CXF allows you to choose between different data-binding technologies.

For the performance tests I'll cover in Part 2, I generated code using each of these data binding frameworks.

Even beyond this confusion issue, I see the data binding function as an aspect (in the AOP sense) that gets applied to the application.

When it comes to displaying large quantities of data in Laszlo, the language's data binding features are very convenient.

With the application, you'll use e4's new XWT perspective and take a look at the XWT data-binding feature.

Provides support for rapid application development ( RAD ) designers to generate and parse data- binding expression syntax .

Method, which enables you to specify an XPath query for read-only data binding.

Is an extensible class that implements the primary interfaces required for two-way Windows Forms data binding.

Data binding is a method of mapping from the format in the data files to the attributes of a business object.

The last method GetCell is actually where the interesting bits of the data binding happen.

SQL data binding takes a familiar API (assuming you've read the previous articles in this series) and applies it all to SQL data stores.

SAX2 is a very useful standard for parsing XML, but its event driven approach is not well suited to data binding and similar applications.

Provides support for rapid application development (RAD) designers to parse data-binding expressions that use XPath expressions.

Gets a value indicating whether data binding is supported by the containing region for the associated control.

It also enhances the efficiency to use data binding technique to avoid complex data type transformation in appending and amending.

The biggest single difference between JiBX and the other data binding frameworks is in how they handle an input XML document.

Most data binding tools could only deal with these multiple namespaces by creating separate sets of classes for each namespace.

When you use a data binding API, you can work with the data in an XML document essentially without the trappings of XML.

After applying Aegis data binding, you can see the element changed to and the child elements and changed to and respectively.

The first problem occurs in one of the typical places for any data binding package: typing.

Therefore the typical practice of using data binding is to covert the EIS Data (WBI record Object) to an SDO and vice versa.

The task of a data binding framework is to get the value stored in the domain object into that model.

Download the JiBX data-binding framework, which lets you adapt existing code for use with Axis2 or other XML applications.

However, with data binding we may use a separate source, like a database, an XML file, or a script to fill the list with selectable items.

Here's where the line between a true data-binding API and XPath starts to becomes a little clearer.

This is the base class for all data-bound controls, which performs the data binding and validation of any bound data.

Create dynamic smart documents that update themselves by using new document controls and data binding to connect to your back-end systems.

First, here are two terms that you should be familiar with if you ve worked with data binding even a little bit.

Walkthrough: Complex Data Binding in an Application-Level Project.

If everyone is familiar with data binding, then why bother with any definition and concept at all?

To add data binding to your Web test, see Walkthrough: Adding Data Binding to a Web Test.

Performs data binding of a ListControl Web server control within a visual designer.

Updates the current Binding between a data binding and a data-bound property.

Next, review the client code for the three data-binding frameworks, and learn the strengths and weaknesses of each approach.

Includes information about validation and extraction rules, data binding, and JavaScript and ActiveX controls in Web tests.

When you work with (and choose) a data binding API, look for a generic API, not a specific one.

This article helped you implement a custom data binding and custom function selector for adapters running in WebSphere Process Server.

The two technologies available to use alternate data binding are described in the articles listed in the Resources section.

Contains information that defines data binding properties for a Web test.

JiBX data binding implements more complex code generation than most other frameworks using bytecode enhancement.

Thereafter, with the help of data binding and method annotations, an XML schema is generated for the Jython service.

Figures 1 through 6 illustrate how the data binding frameworks perform in extended test runs that are representative of server environments.

This is problematic because updates to the XAML data binding (and possibly the data contexts as well) are hard to test.

This connected each Data Binding to a particular binding type e. g. a MQ Data Binding could not be used on a JMS binding.

Provides information about the XMLNodes controls collection; Discusses why data binding is not supported by this control.

Data binding frameworks allow developers to easily "glue" JavaBean properties and GUI components together.

NET supports a hierarchical data-binding model that creates windings between server control properties and data sources.

The design experience is similar to what exists today for data binding.

Arguably the easiest way to achieve this move from using XML as a technology to a business format is data binding.

This greatly improves the xmlbeans data binding support for Axis2 -- every message and SOAP document object gets its own object.

The DataGridView control supports the standard Windows Forms data binding model, so it will bind to a variety of data sources.

Windows Forms supports data binding control properties to public properties on the instance of an object using the Binding type.

Because of these choices, JiBX deliberately differs from the established data binding frameworks in several respects.

To solve this problem, fields with simple data binding are not updated until the updates are explicitly sent by code.

If you are going to use data binding, don't assume that you'll always use data binding.

Dennis Sosnoski has written in depth on the subject of XML data binding APIs of both the code-generation and code-mapping flavors.

A data binding converts the transport's native message into the Service Data Objects (SDOs) expected by the components, and vice versa.

Data binding between the data island and the data-bound controls keeps the two synchronized.

Data binding can do a lot more, though, as objects can be defined to be remote.

You can see a couple of these options when you get to the data-binding examples later in this article.

This version supports this goal and extends it by providing wizards that help you configure data binding and create data components.

As mentioned earlier, JAX-WS relies on JAXB to handle the data binding for most of its Web services content.

For less complicated scenarios, improved documentation demonstrates how you can develop a custom data binding.

A check box may be connected to elements in a database using simple data binding.

The data binding engine calls this method when it propagates the values from source bindings to the binding target.

Typical actions that are offered by task-based editing include editing templates and setting up data binding.

Data binding elsewhere in the MXML code automatically handles the data returned by the list and retrieve calls.

Nearly every commercial application uses information read from data sources of one type or another, usually through data binding.

The Visual Web Developer Web development tool continues to support pages that use the data binding model from previous versions.

But for simplicity, a separate source file is provided that contains the complete MQ Data Binding class implementation.

This walkthrough demonstrates data binding to controls on an actions pane in Microsoft Office Word 2003.

The DataBindings dialog box helps you create a data-binding expression that specifies what a property is bound to.

If you're writing an XML document editor, for instance, you'll want to stick to a document model rather than using data binding.

Otherwise, you'll end up writing lots of conversion code to hand data off to . . . data binding, which performs more conversion!

With data binding approaches, many of the issues associated with SOAP encoding are no longer relevant.

For details, see Walkthrough: Data Binding to a Custom Business Object.

The basic issues associated with a solid data binding package.

To achieve optimum performance and memory efficiency, you need to give the data binding tool direct access to the underlying XML stream.

For many of you, the notion of two endpoints with some data binding code sandwiched in between may be a new idea.

ASP. NET data binding lets you bind components to data sources and to simple properties, collections, expressions, and methods.

But unlike the other data-binding frameworks covered in this article, XMLBeans by default does little to enforce the schema.

For complex controls that support data binding, you can implement the ComplexBindingPropertiesAttribute.

To allow for data binding there needs to be option for adding variables.

Enables data-bound control containers to identify a data item object for simplified data-binding operations.

Property of this exception contains data about why the data binding failed.

Provides a method that can be used to indicate when a data binding has changed.

Component to gracefully handle errors that occur in a data binding operation.

A good data binding tool will always create the same file, over and over again, especially after the initial roundtrip process.

Quick is one such data binding API -- a project that's geared toward business use in Java applications.

Provides step by step details on creating a custom control with attributes specific to working with Windows Forms data binding.

Data-binding method navigates the XML hierarchy and returns a value from a node or an attribute anywhere in the hierarchy.

Browse and select the custom data binding class in Select your custom data format transformation from the workspace.

Notice how the DiggStory title now appears in the user control because of the data binding expression we added to it.

Is intended primarily to be used by programmers adding complex data-binding support to their custom component.

Specifies a design-time class that performs data binding of controls within a designer.

For the presentation tier, the DataSet is tightly integrated with GUI controls for data-binding.

You need to create a custom JMS data binding that maps java. util. Map to the business object representation in Process Server.

Describes different types of change notification for Windows Forms data binding.

In addition, applications can use data binding to set many of the property values for the Calendar control dynamically.

The custom data binding affects how the development artifacts are generated from the Web Services Description Language (WSDL) file.

Data binding is substantially easier, and in many cases requires no code at all.

The following code example defines a data-binding handler, named MyDataBindingHandler, to be used by the designer in editing mode.

This column throws out all the theoretical claptrap and focuses on the concepts you need to get started with data binding.

Follow these steps to hook up data binding for the ComboBox control, and then test the data binding in PowerPoint.

Every data binding package is able to marshal or unmarshal data .

Gets a value indicating whether the control contains any data-binding logic.

New JMS import and export bindings now support additional JMS message types via supplied data binding classes.

The default location of Ant script will be the current Project where the Data Binding is generated.

He explores when data binding makes sense, and details some common programming practices and pitfalls.

With data binding you maintain control over the XML representation of data.

Visual Studio opens the new Excel workbook in the designer and adds the My Simple Data Binding project to Solution Explorer.

My JiBX XML data binding framework is a fast and flexible tool for translating Java objects to and from XML documents.

Of course, as is the case with most of the features of Laszlo, you can use data binding in numerous ways.

Gets a value indicating whether the menu item was created through data binding.

The data-binding examples covered later in this article all use the separate implementation class approach.

Refer back to the earlier article (see Resources) to find out more about how mapped data binding works in Castor.

The obvious solution is to expose the underlying raw XML stream to the data binding tool.

This notion of type-mapping is a key point to remember when developing your Custom Data Binding application.

Gets a value that indicates whether the node was created through data binding.

The SwingLabs project on Java. net has included development on a Swing data binding framework for the past few years.

For a Web control, data binding is enabled, and the user interface is refreshed only when you call the DataBind method.

In the sections on each data binding framework I'll show the generated class structures for comparison purposes.

You should also use the relevant Java data binding for the particular language used in the legacy system.

Allows access to the collection of data-binding expressions on a control at design time.

You can use this handler to do more complex data binding and to set values in the ObjectListItem instance.

Bind method has also been added for two-way data-binding scenarios in edit item templates and update item templates.

Gets the data item at the top of the data-binding context stack.

First, use ZK's Grid component with data binding to build the list as shown in Listing 10.

Gets a value indicating whether the designer allows data binding.

Describes several of the interfaces used with Windows Forms data binding.

JiBX originated as my experiment to explore the performance limits of XML data binding in Java technology.

I hope this introduction has demonstrated how Java data binding frameworks can provide a welcome relief from those activities.

This occurs during data binding; if you make changes to a field, or add or remove fields, you must bind the properties again.

Extends data binding to methods, making MVVM architectures simple and intuitive.

Evaluates an XPath data-binding expression using the specified prefix and namespace mappings for namespace resolution.