/// <summary>
/// Gets the new max key.
/// </summary>
/// <param name="transactionScopeConnection">The transaction scope connection.</param>
/// <param name="tableName">Name of the table.</param>
/// <param name="columnName">Name of the column.</param>
/// <returns></returns>
public override int GetNewMaxKey(System.Data.IDbConnection transactionScopeConnection, string tableName, string columnName)
{
// this will join in to any root transaction
TransactionOptions serializableTransaction = new TransactionOptions();
serializableTransaction.IsolationLevel = System.Transactions.IsolationLevel.Serializable;
using (DbTransactionScope scope = new DbTransactionScope(TransactionScopeOption.Required, serializableTransaction))
{
if (transactionScopeConnection == null)
{
using (new DbConnectionScope())
{
int newMaxKey = GetNewMaxKey(DbConnectionScope.Current.Connection, tableName, columnName);
scope.Complete();
return(newMaxKey);
}
}
else
{
using (IDataReader reader = ExecuteQueryReader(string.Format("select max({0})+1 from {1}", columnName, tableName), transactionScopeConnection))
{
int ret = 1;
if (reader.Read() && !reader.IsDBNull(0))
{
ret = Database.Current.GetInt32(reader, 0);
}
scope.Complete();
return(ret);
}
}
}
}
/// <summary>
/// Ares the transactions nested.
/// </summary>
/// <returns></returns>
public static bool AreTransactionsNested()
{
if (Log.Enabled)
{
Log.Entry("AreTransactionsNested", s_scopes);
}
bool result = false;
if (s_scopes != null && s_scopes.Count > 1)
{
int uniqueTransactionScopes = 1;
int l = s_scopes.Count;
if (Log.Enabled)
{
Log.LogDebug10("Transaction scope count = {0}", l);
}
DbTransactionScope[] ar = new DbTransactionScope[l];
s_scopes.CopyTo(ar, 0);
DbTransactionScope x;
int j;
for (int i = 1; i < l; i++)
{
x = ar[i];
for (j = 0; j < l; j++)
{
if (i != j && !x.Transaction.Equals(ar[j].Transaction))
{
break;
}
}
if (j < l)
{
uniqueTransactionScopes++;
}
}
if (Log.Enabled)
{
Log.LogDebug10("Unique transaction scopes = {0}", uniqueTransactionScopes);
}
result = uniqueTransactionScopes > 1;
}
if (Log.Enabled)
{
Log.Exit("AreTransactionsNested", result);
}
return(result);
}
/// <summary>
/// Initializes a new instance of the <see cref="DbConnectionScope"/> class.
/// If <paramref name="inheritConnections"/> is false, a new Database connection
/// will be used in this scope.
/// </summary>
/// <param name="inheritConnections">if set to <c>true</c> [inherit connections].</param>
public DbConnectionScope(bool inheritConnections)
{
if (Log.Enabled)
{
Log.Entry("DbConnectionScope", inheritConnections);
}
// If the database doesn't support MARS, and there is no transaction or a single transaction,
// then we will open a new connection each time
if (!Database.Current.SupportsFeature(DatabaseFeature.MultipleActiveResultSets))
{
if (Log.Enabled)
{
Log.LogDebug10("Database feature {0} not supported", DatabaseFeature.MultipleActiveResultSets);
}
if (Transaction.Current == null)
{
if (Log.Enabled)
{
Log.LogDebug10("Transaction.Current is null");
}
inheritConnections = false;
}
else if (Database.Current.SupportsFeature(DatabaseFeature.MultipleOpenConnectionsWithinSingleTransaction) && DbTransactionScope.IsInUse)
{
if (Log.Enabled)
{
Log.LogDebug10("DbTransactionScope is inuse");
}
// If this thread is using DbTransactionScope, then we check to see
// if there is only a single transaction or if they are nested
if (DbTransactionScope.AreTransactionsNested())
{
inheritConnections = false;
}
}
}
m_inheritConnections = inheritConnections;
if (Log.Enabled)
{
Log.LogDebug10("InheritConnections = {0}", m_inheritConnections);
}
if (scopes == null)
{
if (Log.Enabled)
{
Log.LogDebug10("Scopes is null, thread {0}", Thread.CurrentThread);
}
scopes = new Stack <DbConnectionScope>();
}
scopes.Push(this);
if (Log.Enabled)
{
Log.Exit("DbConnectionScope");
}
}
