/// <summary>
/// Provides the core logic for the <see cref="Prepare()"/> method.
/// </summary>
internal void PrepareInternal()
{
if (!IsPrepared)
{
string sql;
HsqlSession session = this.Session;
switch (m_commandType)
{
case CommandType.StoredProcedure:
{
sql = StoredProcedureCommandText;
break;
}
case CommandType.Text:
{
sql = DefaultParameterMarkerCommandText;
break;
}
case CommandType.TableDirect:
{
sql = TableDirectCommandText;
break;
}
default:
{
throw new HsqlDataSourceException(
"CommandType not supported: "
+ m_commandType); // NOI18N
}
}
m_statement = session.PrepareStatement(sql);
// no longer valid
m_commandTextBatch = null;
}
}
/// <summary>
/// Releases, if present, the underlying <c>HsqlStatement</c> and
/// makes eligible for garbage collection any related resources.
/// </summary>
internal void InvalidateStatement()
{
try
{
// localize member references to minimize
// potential race conditions regarding
// null status of instance variables.
HsqlConnection connection = m_dbConnection;
HsqlStatement statement = m_statement;
// Don't leak compiled statement handles
if (connection != null &&
connection.State == ConnectionState.Open &&
statement != null)
{
statement.Free(Session);
}
}
finally
{
m_statement = null;
m_tokenList = null;
m_storedProcedureCommandText = null;
m_tableDirectCommandText = null;
}
}
