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Gets or sets the time to wait while executing the command before terminating the attempt and generating an error. The default is 30 seconds. Gets or sets the DbConnection used by this instance of the DbCommand. Gets the collection of DbParameter types used for a parameterized query. Cancels the execution of a command. Returns the data provider s DbDataReader object, which provides forward-only, read-only access to the underlying data. Issues the command text to the data store. A lightweight version of the ExecuteNonQuery() method, designed specifically for singleton queries (such as obtaining a record count). Microsoft SQL Server (2000 and higher) is capable of returning result sets as XML. As you might suspect, this method returns a System.Xml.XmlReader that allows you to process the incoming stream of XML. Creates a prepared (or compiled) version of the command on the data source. As you may know, a prepared query executes slightly faster and is useful when you wish to execute the same query multiple times.

fraPCType Computer Type optDesktop Desktop optLaptop Laptop fraPhoneType Phone Type optStandard Standard optCell Cell Phone Location cboLocation chkFaxYN Fax Machine Y/N

Used to specify the actual quote marks to be used when open-quote or close-quote values are specified for the content property. Value: Either none or any number of text string pairs. Each pair of strings defines openand close-quote marks for increasingly nested levels of quotations. Initial value: Determined by the user agent Inherited: Yes Applies to: All elements Supported by: Firefox, Opera

Connection Parameters Cancel() ExecuteReader() ExecuteNonQuery() ExecuteScalar() ExecuteXmlReader()

Prepare()

As illustrated later in this chapter, as of .NET 2.0, the SqlCommand object has been updated with additional members that facilitate asynchronous database interactions.

Increments the specified counters. Value: none | <counter name> Initial value: none Inherited: No Applies to: All elements Supported by: Firefox, Opera

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Once you have established the active connection and SQL command, the next step is to submit the query to the data source. As you might guess, you have a number of ways to do so. The DbDataReader type (which implements IDataReader) is the simplest and fastest way to obtain information from a data store. Recall that data readers represent a read-only, forward-only stream of data returned one record at a time. Given this, it should stand to reason that data readers are useful only when submitting SQL selection statements to the underlying data store. Data readers are useful when you need to iterate over large amounts of data very quickly and have no need to maintain an in-memory representation. For example, if you request 20,000 records from a table to store in a text file, it would be rather memory-intensive to hold this information in

Page3 in Design view will look something like Figure 4-25.

a DataSet. A better approach is to create a data reader that spins over each record as rapidly as possible. Be aware, however, that data reader objects (unlike data adapter objects, which you ll examine later) maintain an open connection to their data source until you explicitly close the session. Data reader objects are obtained from the command object via a call to ExecuteReader(). When invoking this method, you may optionally instruct the reader to automatically close down the related connection object by specifying CommandBehavior.CloseConnection. The following use of the data reader leverages the Read() method to determine when you have reached the end of your records (via a false return value). For each incoming record, you are making use of the type indexer to print out the make, pet name, and color of each automobile. Also note that you call Close() as soon as you are finished processing the records, to free up the connection object: static void Main(string[] args) { ... // Obtain a data reader a la ExecuteReader(). SqlDataReader myDataReader; myDataReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection); // Loop over the results. while (myDataReader.Read()) { Console.WriteLine("-> Make: {0}, PetName: {1}, Color: {2}.", myDataReader["Make"].ToString().Trim(), myDataReader["PetName"].ToString().Trim(), myDataReader["Color"].ToString().Trim()); } myDataReader.Close(); ShowConnectionStatus(cn); }

The trimming of the string data shown here is only used to remove trailing blank spaces in the database entries; it is not directly related to ADO.NET!

Resets the specified counters. Value: none | <counter name> Initial value: none Inherited: No Applies to: All elements Supported by: Firefox, Opera

The indexer of a data reader object has been overloaded to take either a string (representing the name of the column) or an integer (representing the column s ordinal position). Thus, you could clean up the current reader logic (and avoid hard-coded string names) with the following update (note the use of the FieldCount property): while (myDataReader.Read()) { Console.WriteLine("***** Record *****"); for (int i = 0; i < myDataReader.FieldCount; i++) { Console.WriteLine("{0} = {1} ", myDataReader.GetName(i), myDataReader.GetValue(i).ToString().Trim()); } Console.WriteLine(); } If you compile and run your project, you should be presented with a list of all automobiles in the Inventory table of the Cars database (see Figure 22-7).

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