/// <summary>
/// Converts all results encapsulated by the given
/// <see cref="HsqlDataReader"/> to a snapshot form
/// suitable for long term persistence or network
/// transmission.
/// </summary>
/// <remarks>
/// The returned <c>System.Byte[]</c> can be converted
/// back into a data reader using <see cref="FromByteArray(Byte[])"/>.
/// </remarks>
/// <param name="reader">
/// To convert to a <c>Byte[]</c> value.
/// </param>
/// <returns>
/// A new <c>System.Byte[]</c>
/// </returns>
public static byte[] ToByteArray(HsqlDataReader reader)
{
using (MemoryStream stream = new MemoryStream())
{
WriteToStream(stream, reader);
return(stream.ToArray());
}
}
/// <summary>
/// Provides the core logic for the
/// <see cref="ExecuteReader(CommandBehavior)"/> method.
/// </summary>
/// <param name="behavior">The requested behavior.</param>
/// <returns>
/// The result generated by executing the query.
/// </returns>
internal HsqlDataReader ExecuteReaderInternal(CommandBehavior behavior)
{
if (Behavior.IsSchemaOnly(behavior))
{
bool wasAlreadyPrepared = IsPrepared;
if (!wasAlreadyPrepared)
{
Prepare(); // already correctly locked.
}
Result descriptor = m_statement.ResultDescriptor;
HsqlCommand originatingCommand = this;
HsqlConnection originatingConnection = m_dbConnection;
HsqlDataReader reader0 = new HsqlDataReader(descriptor, behavior,
originatingCommand, originatingConnection);
if (Behavior.IsKeyInfo(behavior))
{
// Do it now, so that it does not fail later if
// originating connection is closed before first
// client invocation of reader.GetSchemaTable().
reader0.GetSchemaTable();
}
if (!wasAlreadyPrepared)
{
UnPrepare();
}
return reader0;
}
Result result;
int maxRows = (Behavior.IsSingleRow(behavior)) ? 1 : 0;
if (IsPrepared)
{
ApplyParameters();
HsqlSession session = Session;
session.MaxRows = maxRows;
result = m_statement.Execute(session);
}
else
{
HsqlSession session = Session;
session.MaxRows = maxRows;
result = session.ExecuteDirect(StaticallyBoundCommandText);
}
HsqlDataReader reader = new HsqlDataReader(result, behavior, this,
this.m_dbConnection);
if (Behavior.IsKeyInfo(behavior))
{
// Do it now, so that it does not fail later if
// originating connection is closed before first
// client invocation of reader.GetSchemaTable().
reader.GetSchemaTable();
}
return reader;
}
/// <summary>
/// Writes all results encapsulated by the given
/// <see cref="HsqlDataReader"/> to a snapshot form
/// suitable for long term persistence or network
/// transmission.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="reader">The reader.</param>
public static void WriteToStream(Stream stream, HsqlDataReader reader)
{
WriteResult(stream, reader.m_result);
}
/// <summary>
/// Converts all results encapsulated by the given
/// <see cref="HsqlDataReader"/> to a snapshot form
/// suitable for long term persistence or network
/// transmission.
/// </summary>
/// <remarks>
/// The returned <c>System.Byte[]</c> can be converted
/// back into a data reader using <see cref="FromByteArray(Byte[])"/>.
/// </remarks>
/// <param name="reader">
/// To convert to a <c>Byte[]</c> value.
/// </param>
/// <returns>
/// A new <c>System.Byte[]</c>
/// </returns>
public static byte[] ToByteArray(HsqlDataReader reader)
{
using (MemoryStream stream = new MemoryStream())
{
WriteToStream(stream, reader);
return stream.ToArray();
}
}
/// <summary>
/// Provides the core logic for the
/// <see cref="ExecuteReader(CommandBehavior)"/> method.
/// </summary>
/// <param name="behavior">The requested behavior.</param>
/// <returns>
/// The result generated by executing the query.
/// </returns>
internal HsqlDataReader ExecuteReaderInternal(CommandBehavior behavior)
{
if (Behavior.IsSchemaOnly(behavior))
{
bool wasAlreadyPrepared = IsPrepared;
if (!wasAlreadyPrepared)
{
Prepare(); // already correctly locked.
}
Result descriptor = m_statement.ResultDescriptor;
HsqlCommand originatingCommand = this;
HsqlConnection originatingConnection = m_dbConnection;
HsqlDataReader reader0 = new HsqlDataReader(descriptor, behavior,
originatingCommand, originatingConnection);
if (Behavior.IsKeyInfo(behavior))
{
// Do it now, so that it does not fail later if
// originating connection is closed before first
// client invocation of reader.GetSchemaTable().
reader0.GetSchemaTable();
}
if (!wasAlreadyPrepared)
{
UnPrepare();
}
return(reader0);
}
Result result;
int maxRows = (Behavior.IsSingleRow(behavior)) ? 1 : 0;
if (IsPrepared)
{
ApplyParameters();
HsqlSession session = Session;
session.MaxRows = maxRows;
result = m_statement.Execute(session);
}
else
{
HsqlSession session = Session;
session.MaxRows = maxRows;
result = session.ExecuteDirect(StaticallyBoundCommandText);
}
HsqlDataReader reader = new HsqlDataReader(result, behavior, this,
this.m_dbConnection);
if (Behavior.IsKeyInfo(behavior))
{
// Do it now, so that it does not fail later if
// originating connection is closed before first
// client invocation of reader.GetSchemaTable().
reader.GetSchemaTable();
}
return(reader);
}
/// <summary>
/// Writes all results encapsulated by the given
/// <see cref="HsqlDataReader"/> to a snapshot form
/// suitable for long term persistence or network
/// transmission.
/// </summary>
/// <param name="stream">The stream.</param>
/// <param name="reader">The reader.</param>
public static void WriteToStream(Stream stream, HsqlDataReader reader)
{
WriteResult(stream, reader.m_result);
}