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In the first Catch clause, you specified a database exception type. The second Catch clause, which produced the message box in Figure 13-3, is a generic block that catches all types of exceptions. Note the caption of the message box in this Catch block. It says NonDatabase Exception. Although you might think that a failure to specify a command string is a database exception, it s actually an ADO.NET exception; in other words, this error is trapped before it gets to the database server. So, when the button was clicked, because the CommandText property wasn t specified, an exception was thrown and caught by the second Catch clause. Even though a Catch clause for SqlException was provided, the exception was a System.InvalidOperationException, a common exception thrown by the CLR, not a database exception. The exception message indicates where the problem occurred: in the ExecuteReader method. The Finally block checks if the connection is open, and if it is, closes it and gives a message to that effect. Note that in handling the exception you did not terminate the application.

You can modify a row using the same technique. You simply select the appropriate row and set its columns to whatever values you want, consistent with the column data types, of course. The following line shows the City column of the first row of the dataset being changed to Wilmington: ' modify city in first row dt.Rows(0)("city") = "Wilmington" Next you add a new row to the data table: ' add a row Dim newRow As DataRow = dt.NewRow() newRow("firstname") = "Roy" newRow("lastname") = "Beatty" newRow("titleofcourtesy") = "Sir" newRow("city") = "Birmingham" newRow("country") = "UK" dt.Rows.Add(newRow) The NewRow method creates a data row (a System.Data.DataRow instance). You use the data row s indexer to assign values to its columns. Finally, you add the new row to the data table, calling the Add method on the data table s Rows property, which references the rows collection. Note that you don t provide a value for EmployeeID since it s an IDENTITY column. If you were to persist the changes to the database, SQL Server would automatically provide a value for it. Updating data sources requires learning more about data adapter methods and properties. Let s take a look at these now.

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if ( attrs.size() > 0 ) { Set<String> keys = attrs.keySet(); for (String key : keys) { String attrValue = attrs.get( key ); field = new Field( key.toLowerCase(), attrValue, mStore, mIndex, mVector ); mFieldList.add( field );

Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block closing the connection", "Finally") conn.Close() End If End Try

CHAPTER 13 } attrs.clear(); } } }

Try It Out: Handling an ADO.NET Exception (Part 2)

You ve seen how a data adapter populates a dataset s data tables. What you haven t looked at yet is how a data adapter updates and synchronizes a data source with data from a dataset. It has three properties that support this (analogous to its SelectCommand property, which supports queries): UpdateCommand InsertCommand DeleteCommand We ll describe each of these properties briefly and then put them to work.

public void characters( char[] ch, int start, int length ) { text.append( ch, start, length ); } public void startDocument() { mFieldList.clear(); } public void endDocument() { for (Field f : mFieldList) { mDocument.add( f ); } } } }

We start by extending the DefaultHandler class B discussed earlier, which, in conjunction with generating an instance of a SAX parser F, declares this class as the handler of all SAX-generated events. The first event fired is the startDocument event 1@, where we initialize the FieldList. We implement the set method required by FieldBridges C. Here we extract the XML from the priceData property D and create an InputSource object from it E. G is the event handler for each XML element. Here we clear the StringBuilder text and then store any attributes of the element in a HashMap H for later retrieval. When the endElement event is fired, processing continues at I. Unless the element is the CD element, we create a field for the element itself J and also individual fields for each attribute 1), if there were any for this element. When element text is encountered, the characters event is fired 1!. This fills the text buffer for use by other events. Finally, at 1# we add each generated Field to the document. Some people have problems conceptualizing callback methods. If you can determine from this example that you are one of those people, this may not be the easiest XML processing model for you to grasp. In that event you could use the DOM, which we discuss next.

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