Mega Code Archive
Illustrates the use of transactions
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/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example23_4.cs illustrates the use of transactions
*/
using System;
using System.Data;
using System.Data.SqlClient;
public class Example23_4
{
public static void Main()
{
// formulate a string containing the details of the
// database connection
string connectionString =
"server=localhost;database=Northwind;uid=sa;pwd=sa";
// create a SqlConnection object to connect to the
// database, passing the connection string to the constructor
SqlConnection mySqlConnection =
new SqlConnection(connectionString);
// open the database connection using the
// Open() method of the SqlConnection object
mySqlConnection.Open();
// step 1: create a SqlTransaction object and start the transaction
// by calling the BeginTransaction() method of the SqlConnection
// object
SqlTransaction mySqlTransaction =
mySqlConnection.BeginTransaction();
// step 2: create a SqlCommand object to hold a SQL statement
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
// step 3: set the Transaction property for the SqlCommand object
mySqlCommand.Transaction = mySqlTransaction;
// step 4: formulate a string containing the first INSERT statement
string insertString =
"INSERT INTO Customers (" +
" CustomerID, CompanyName, ContactName, Address" +
") VALUES (" +
" 'T2COM', 'T2 Company', 'Jason Price', '1 Main Street'" +
")";
// step 5: set the CommandText property of the SqlCommand object to
// the INSERT string
mySqlCommand.CommandText = insertString;
// step 6: run the first INSERT statement
Console.WriteLine("Running first INSERT statement");
mySqlCommand.ExecuteNonQuery();
// step 7: formulate a second INSERT statement
insertString =
"INSERT INTO Orders (" +
" CustomerID" +
") VALUES (" +
" 'T2COM'" +
")";
// step 8: set the CommandText property of the SqlCommand object to
// the second INSERT string
mySqlCommand.CommandText = insertString;
// step 9: run the second INSERT statement
Console.WriteLine("Running second INSERT statement");
mySqlCommand.ExecuteNonQuery();
// step 10: commit the transaction using the Commit() method
// of the SqlTransaction object
Console.WriteLine("Committing transaction");
mySqlTransaction.Commit();
// close the database connection using the Close() method
// of the SqlConnection object
mySqlConnection.Close();
}
}
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