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static private string GetStringFromDb( System.Data.SqlClient.SqlConnection sqlConnection, string sqlQuery) { if (sqlConnection.State != System.Data.ConnectionState.Open) { sqlConnection.Open(); } System.Data.SqlClient.SqlCommand sqlCommand = new System.Data.SqlClient.SqlCommand(sqlQuery, sqlConnection); System.Data.SqlClient.SqlDataReader sqlDataReader = sqlCommand.ExecuteReader(); string result = null; try { if (!sqlDataReader.Read()) { throw (new Exception( String.Format("Unexpected exception executing query [{0}].", sqlQuery))); } else { if (!sqlDataReader.IsDBNull(0)) { result = sqlDataReader.GetString(0); } } } finally { // always call Close when done reading. sqlDataReader.Close(); } return (result); } To call the GetStringFromDb method, a SqlConnection and a string containing a SQL query are passed into the method. The method verifies that the connection is open, and if the connection is not open, the method opens it. Next, a SqlCommand is created by passing the query and connection into the constructor. Then, a SqlDataReader is obtained by calling the ExecuteReader method on the SqlCommand. The SqlDataReader is read by calling its Read method, and if data was read and the returned first column s

Just as you are able to remove a sequence of nodes using the IEnumerable<T>.Remove method, you can use the same method to remove all attributes of an element, as shown in Listing 7-82. Listing 7-82. Removing All of an Element s Attributes // I will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(System.Environment.NewLine + "Before removing attributes:"); Console.WriteLine(xDocument); firstParticipant.Attributes().Remove(); Console.WriteLine(System.Environment.NewLine + "After removing attributes:"); Console.WriteLine(xDocument); In the previous example, I call the Attributes method to return the sequence of all attributes of the element the Attributes method is called on, and then I call the Remove method on that returned sequence to remove them all. This seems so simple and intuitive, I wonder if I am wasting your time just covering it. Here are the results:

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value is not null, the returned first column value is retrieved with the GetString method. Finally, the SqlDataReader is closed, and the first column value is returned to the calling method.

Before removing attributes: <BookParticipants> <BookParticipant type="Author" experience="first-time"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> After removing attributes: <BookParticipants> <BookParticipant> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> Like magic, the attributes are gone.

You evaluate whether the parent UIComponentTag has a matching UIComponent by invoking the getCreated() method. This method returns true if the parent UIComponentTag created an instance of a UIComponent during its execution, which in this case is a UIShowOne component. This statement is implemented to avoid the case where a UIComponentTag is not creating a new instance of a UIComponent, which happens on postback, since the component hierarchy already exists. The next important part of the doStartTag() method is to see whether the property _type is a fully qualified class name (for example, com.apress.projsf.ch3.application. MyShowListener) or whether it is a ValueBinding reference (for example, #{myBean. returnListener}). This class name is passed as an argument to the createShowListener() method, which returns a new instance of this ShowListener class.

ExecuteStatementInDb()

In addition to using the XAttribute.Value property to update attributes, be sure to check out the XElement.SetAttributeValue() section later in the chapter.

Sometimes, we will need to execute nonquery SQL statements such as insert, update, and delete in ADO.NET to modify the state of the database external to LINQ to SQL. For that purpose, we have created the ExecuteStatementInDb method:

Execute St ate ment InD b: A M ethod for Exe cutin g I n se rt, Upd ate s, and De let es in ADO.NE T

Updating the value of an attribute is easily accomplished using its Value property. Listing 7-83 is an example. Listing 7-83. Changing an Attribute s Value // I will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); Console.WriteLine(System.Environment.NewLine + "Before changing attribute's value:"); Console.WriteLine(xDocument); firstParticipant.Attribute("experience").Value = "beginner"; Console.WriteLine(System.Environment.NewLine + "After changing attribute's value:"); Console.WriteLine(xDocument);

s Note JSF 1.2 adds a binding attribute to all standard converter, validator, and listener tags. You can use

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