/// <summary>
/// Executes a command that returns a single value.
/// </summary>
/// <param name="commandText">The command text.</param>
/// <param name="parameters">The parameters.</param>
/// <returns>The return value of the command.</returns>
protected override object ExecuteScalar(string commandText, SqlCeParameter[] parameters)
{
#if DEBUG && DebugDataLayer
// Log Query Execution
Trace.TraceInformation(GetType().Name + " SQL ExecuteScalar: " + commandText);
#endif
return(SqlCeApplicationBlock.ExecuteScalar(ConnectionString, CommandType.Text, commandText, parameters));
}
/// <summary>
/// Executes a command and returns a records reader containing the results.
/// </summary>
/// <param name="commandText">The command text.</param>
/// <param name="parameters">The parameters.</param>
/// <returns>
/// A data reader containing the results of the command.
/// </returns>
protected override IRecordsReader ExecuteReader(string commandText, SqlCeParameter[] parameters)
{
#if DEBUG && DebugDataLayer
// Log Query Execution
Trace.TraceInformation(GetType().Name + " SQL ExecuteReader: " + commandText);
#endif
return(new SqlCeDataReaderHelper(SqlCeApplicationBlock.ExecuteReader(ConnectionString, CommandType.Text,
commandText, parameters)));
}
/// <summary>
/// Executes a command that returns a single value.
/// </summary>
/// <param name="commandText">The command text.</param>
/// <param name="parameters">The parameters.</param>
/// <returns>The return value of the command.</returns>
protected override object ExecuteScalar(string commandText, SqlCeParameter[] parameters)
{
#if DEBUG && DebugDataLayer
// Log Query Execution
Trace.TraceInformation(GetType().Name + " SQL ExecuteScalar: " + commandText);
#endif
using (var cc = UseCurrentConnection)
{
return(SqlCeApplicationBlock.ExecuteScalar(
(SqlCeConnection)cc.Connection, (SqlCeTransaction)cc.Transaction,
CommandType.Text, commandText, parameters));
}
}
// We need to override this as the default way of detection a db connection checks for systables that doesn't exist
// in a CE db
protected override DatabaseVersion DetermineCurrentVersion()
{
DatabaseVersion version = base.DetermineCurrentVersion();
if (version != DatabaseVersion.Unavailable)
{
return(version);
}
// verify connection
try
{
if (SqlCeApplicationBlock.VerifyConnection(base.SqlHelper.ConnectionString))
{
return(DatabaseVersion.None);
}
}
catch (Exception e)
{
Trace.WriteLine(e.ToString());
}
return(DatabaseVersion.Unavailable);
}
