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As you will soon see, many of the examples in the LINQ to SQL chapters become complex very quickly. Demonstrating a concurrency conflict requires making changes to the database external to LINQ to SQL. Sometimes, I need to retrieve data externally of LINQ to SQL too. To highlight the LINQ to SQL code and to eliminate as many of the trivial details as possible, while at the same time providing real working examples, I have created some common methods to use in many of the examples. Be sure to add these common methods to your source modules as appropriate when testing the examples in the LINQ to SQL chapters.

{ component.encodeChildren(context); } else { List kids = component.getChildren(); Iterator it = kids.iterator(); while (it.hasNext()) { UIComponent kid = (UIComponent)it.next(); _encodeAll(context, kid); } } component.encodeEnd(context); } } The requirement for the deck component is to make it flexible enough to handle any type of child component added to the UIShowItem component by the application developer. The UIShowItem component itself is not responsible for rendering its children, but sometimes an application developer has added a child container component for rendering its children (for example, an HtmlPanelGrid component). To be able to achieve this, you first call encodeBegin() to start rendering the generated markup for the current component. You then check whether the component is responsible for rendering its children. If it is, you call encodeChildren() on the component to render all of its children. However, if the component is not responsible for rendering its children, then you iterate over the child components and recursively call _encodeAll() for each one. Finally, you complete the generated markup by calling the encodeEnd() method on the component.

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Here are the results: Before upserting DataTable: Student Id = 1 : original Joe Rattz : current Joe Rattz Student Id = 7 : original Anthony Adams : current Anthony Adams Student Id = 13 : original Stacy Sinclair : current Stacy Sinclair Student Id = 72 : original Dignan Stephens : current Dignan Stephens After upserting DataTable: Student Id = 1 : original Joe Rattz : current Joe Rattz Student Id = 7 : original Anthony Adams : current Anthony Adams Student Id = 13 : original Stacy Sinclair : current Stacy Sinclair Student Id = 72 : original Dignan Stephens : current Dignan Stephens Student Id = 1 : original -does not exist- : current Joe Rattz Student Id = 7 : original -does not exist- : current George Oscar Bluth Student Id = 13 : original -does not exist- : current Stacy Sinclair Student Id = 72 : original -does not exist- : current Dignan Stephens Notice that several records are now duplicated because we don t specify any primary keys in the destination DataTable.

GetStringFromDb()

Even the record we actually updated is in the DataTable twice now You may be wondering, since we made such a big deal about calling the HasVersion method since the AcceptChanges method was not called, why not just call the AcceptChanges method You could do that, but if you did, all of the fields current version values would have become their original version values, and you would not have been able to tell which records had changed For these examples, we want the original version values and current version values to be distinguishable when a record is changed..

The solution to the problem in the previous example is to specify the primary keys for the destination DataTable. Listing 10-19 is the same example as the previous, except this time we specify the primary keys.

A common method that will come in handy is a method to obtain a simple string from the database using standard ADO.NET. This will allow me to examine what is actually in the database, as opposed to what LINQ to SQL is showing me. GetStringFromDb: a Method for Retrieving a String Using ADO.NET static private string GetStringFromDb( System.Data.SqlClient.SqlConnection sqlConnection, string sqlQuery) { if (sqlConnection.State != System.Data.ConnectionState.Open) { sqlConnection.Open(); }

s Note A new method, UIComponent.encodeAll(FacesContext), has been added to the JSF 1.2 release and implements equivalent functionality to the _encodeAll(FacesContext, UIComponent) method shown in Code Sample 3-27.

Listin g 10-19. Calling the Second Prototype of the CopyToDataTable Operator When Primary Keys Are Established

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