public void ExecuteNonQuery_Transaction_Test()
{
using (var cmd = new DatabaseCommand(_connection))
{
cmd.Log = Console.WriteLine;
cmd.CommandText.AppendLine(" DELETE FROM EMP ");
cmd.TransactionBegin();
cmd.ExecuteNonQuery();
cmd.TransactionRollback();
Assert.AreEqual(EMP.GetEmployeesCount(_connection), 14);
}
}
public async Task ExecuteNonQueryAsync_Transaction_Test()
{
using (var cmd = new DatabaseCommand(_connection))
{
cmd.Log = Console.WriteLine;
cmd.CommandText.AppendLine(" DELETE FROM EMP ");
cmd.TransactionBegin();
int count = await cmd.ExecuteNonQueryAsync();
cmd.TransactionRollback();
Assert.AreEqual(14, count);
Assert.AreEqual(14, EMP.GetEmployeesCount(_connection));
}
}
public void Transaction_TwoBeginTransaction_Test()
{
// Main Transaction
using (var cmd1 = new DatabaseCommand(_connection))
{
cmd1.Log = Console.WriteLine;
var trans1 = cmd1.TransactionBegin();
// Second Transaction
using (var cmd2 = new DatabaseCommand(trans1))
{
// Raise an exception
var trans2 = cmd2.TransactionBegin();
}
cmd1.TransactionRollback();
}
}
public void ExecuteNonQuery_TransactionForTwoIncludedCommands_Test()
{
using (var cmd1 = new DatabaseCommand(_connection))
{
cmd1.Log = Console.WriteLine;
cmd1.CommandText.AppendLine(" DELETE FROM EMP ");
cmd1.TransactionBegin();
cmd1.ExecuteNonQuery();
using (var cmd2 = new DatabaseCommand(cmd1.Transaction))
{
cmd2.CommandText.AppendLine(" SELECT COUNT(*) FROM EMP ");
int count = cmd2.ExecuteScalar <int>();
}
cmd1.TransactionRollback();
}
}
public void ExecuteNonQuery_TransactionForTwoCommands_Test()
{
DbTransaction currentTransaction;
using (var cmd = new DatabaseCommand(_connection))
{
cmd.Log = Console.WriteLine;
cmd.CommandText.AppendLine(" DELETE FROM EMP ");
currentTransaction = cmd.TransactionBegin();
cmd.ExecuteNonQuery();
Assert.AreEqual(EMP.GetEmployeesCount(currentTransaction), 0); // Inside the transaction
cmd.TransactionRollback();
Assert.AreEqual(EMP.GetEmployeesCount(_connection), 14); // Ouside the transaction
}
}
public void Transaction_GetInternalTransaction_Test()
{
using (var cmd = new DatabaseCommand(_connection))
{
cmd.Log = Console.WriteLine;
cmd.CommandText.AppendLine(" DELETE FROM EMP ");
var trans1 = DataExtensions.GetTransaction(_connection);
var trans2A = cmd.TransactionBegin();
var trans2B = DataExtensions.GetTransaction(_connection);
cmd.ExecuteNonQuery();
cmd.TransactionRollback();
var trans3 = DataExtensions.GetTransaction(_connection);
Assert.AreEqual(EMP.GetEmployeesCount(_connection), 14);
Assert.AreEqual(null, trans1);
Assert.AreEqual(trans2A, trans2B);
Assert.AreEqual(null, trans3);
}
}
private DbException RaiseSqlDeadLock(bool withRetry, bool throwException)
{
// See: http://stackoverflow.com/questions/22825147/how-to-simulate-deadlock-on-sql-server
SqlConnection connection2 = new SqlConnection(Configuration.CONNECTION_STRING);
connection2.Open();
DbException exToReturn = null;
try
{
using (var cmd = new DatabaseCommand(_connection))
{
cmd.Log = Console.WriteLine;
cmd.CommandText = @" CREATE TABLE ##Employees (
EmpId INT IDENTITY,
EmpName VARCHAR(16),
Phone VARCHAR(16)
)
INSERT INTO ##Employees (EmpName, Phone)
VALUES('Martha', '800-555-1212'), ('Jimmy', '619-555-8080')
CREATE TABLE ##Suppliers (
SupplierId INT IDENTITY,
SupplierName VARCHAR(64),
Fax VARCHAR(16)
)
INSERT INTO ##Suppliers (SupplierName, Fax)
VALUES ('Acme', '877-555-6060'), ('Rockwell', '800-257-1234') ";
cmd.ExecuteNonQuery();
}
using (var cmd1 = new DatabaseCommand(_connection))
{
using (var cmd2 = new DatabaseCommand(connection2))
{
cmd1.Log = Console.WriteLine;
cmd2.Log = Console.WriteLine;
cmd1.TransactionBegin();
cmd2.TransactionBegin();
cmd1.CommandText = " UPDATE ##Employees SET EmpName = 'Mary' WHERE empid = 1 ";
cmd1.ExecuteNonQuery();
cmd2.CommandText = " UPDATE ##Suppliers SET Fax = N'555-1212' WHERE supplierid = 1 ";
cmd2.ExecuteNonQuery();
// Start and when cmd2.ExecuteNonQuery command will be executed, an DeadLock exception will be raised.
Task task1 = Task.Factory.StartNew(() =>
{
cmd1.ThrowException = throwException;
if (withRetry)
{
cmd1.Retry.SetDefaultCriteriaToRetry(RetryDefaultCriteria.SqlServer_DeadLock);
}
cmd1.CommandText = " UPDATE ##Suppliers SET Fax = N'555-1212' WHERE supplierid = 1 ";
cmd1.ExecuteNonQuery();
});
System.Threading.Thread.Sleep(500);
cmd2.CommandText = " UPDATE ##Employees SET phone = N'555-9999' WHERE empid = 1 ";
cmd2.ExecuteNonQuery();
cmd2.Dispose();
connection2.Close();
// Wait cmd1 finished (and raised an Exception)
task1.Wait();
exToReturn = cmd1.Exception;
}
}
DropTemporaryTable();
}
finally
{
connection2.Close();
connection2.Dispose();
connection2 = null;
}
return(exToReturn);
}