public static void NonrepeatableReadFirstThread(String connStrig, IsolationLevel level)
{
Console.WriteLine("Begin the NonrepeatableReadFirstThread.....");
using (SqlConnection conn = new SqlConnection(connStrig)) {
String cmdText = @"Use DbDataIsolationLevel;
Select ProductId,ProductName,Quantity,Price
from dbo.Products
where ProductId=1
WaitFor Delay '00:00:06';
Select ProductId,ProductName,Quantity,Price
from dbo.Products
where ProductId=1";
conn.Open();
using (SqlTransaction tran = conn.BeginTransaction(level, "NonrepeatableReadFirst")) {
using (SqlCommand command = new SqlCommand(cmdText, conn)) {
command.Transaction = tran;
using (SqlDataReader reader = command.ExecuteReader()) {
Boolean isFirstReader = true;
do
{
Console.WriteLine("It's the result of {0} read:", isFirstReader ? "first" : "second");
TransactionIsolationLevels.DisplayData(reader);
isFirstReader = !isFirstReader;
} while (reader.NextResult() && !isFirstReader);
}
}
tran.Commit();
}
}
Console.WriteLine("Exit from the NonrepeatableReadFirstThread.....");
}
static void Main(string[] args)
{
String connString = "Data Source=(local);Initial Catalog=master;Integrated Security=True;Asynchronous Processing=true;";
OperateDatabase.CreateDatabase(connString);
Console.WriteLine();
Console.WriteLine("Demonstrate the ReadUncommitted transaction: ");
TransactionIsolationLevels.DemonstrateIsolationLevel(connString,
System.Data.IsolationLevel.ReadUncommitted);
Console.WriteLine("-----------------------------------------------");
Console.WriteLine("Demonstrate the ReadCommitted transaction: ");
TransactionIsolationLevels.DemonstrateIsolationLevel(connString,
System.Data.IsolationLevel.ReadCommitted);
Console.WriteLine("-----------------------------------------------");
Console.WriteLine("Demonstrate the RepeatableRead transaction: ");
TransactionIsolationLevels.DemonstrateIsolationLevel(connString,
System.Data.IsolationLevel.RepeatableRead);
Console.WriteLine("-----------------------------------------------");
Console.WriteLine("Demonstrate the Serializable transaction: ");
TransactionIsolationLevels.DemonstrateIsolationLevel(connString,
System.Data.IsolationLevel.Serializable);
Console.WriteLine("-----------------------------------------------");
Console.WriteLine("Demonstrate the Snapshot transaction: ");
OperateDatabase.SetSnapshot(connString, true);
TransactionIsolationLevels.DemonstrateIsolationLevel(connString,
System.Data.IsolationLevel.Snapshot);
Console.WriteLine("-----------------------------------------------");
Console.WriteLine("Demonstrate the difference between the Snapshot and Serializable transactions:");
TransactionIsolationLevels.DemonstrateBetweenSnapshotAndSerializable(connString);
OperateDatabase.SetSnapshot(connString, false);
Console.WriteLine();
}
