/// <summary>
/// Prepares the necessary byte buffers from the given CommandText
/// </summary>
/// <returns>Array of byte buffers, one for each SQL command</returns>
/// <remarks>
/// Converts the CommandText into an array of tokens
/// using TokenizeSql and then into one or more byte buffers that can be
/// sent to the server. If the server supports batching (and we have enabled it),
/// then all commands result in a single byte array, otherwise a single buffer
/// is created for each SQL command (as separated by ';').
/// The SQL text is converted to bytes using the active encoding for the server.
/// </remarks>
private ArrayList PrepareSqlBuffers(string sql)
{
ArrayList buffers = new ArrayList();
PacketWriter writer = new PacketWriter();
writer.Encoding = connection.Encoding;
writer.Version = connection.driver.Version;
// if we are executing as a stored procedure, then we need to add the call
// keyword.
if (CommandType == CommandType.StoredProcedure)
{
if (storedProcedure == null)
{
storedProcedure = new StoredProcedure(connection);
}
sql = storedProcedure.Prepare(this);
}
// tokenize the SQL
sql = sql.TrimStart(';').TrimEnd(';');
ArrayList tokens = TokenizeSql(sql);
foreach (string token in tokens)
{
if (token.Trim().Length == 0)
{
continue;
}
if (token == ";" && !connection.driver.SupportsBatch)
{
MemoryStream ms = (MemoryStream)writer.Stream;
if (ms.Length > 0)
{
buffers.Add(ms);
}
writer = new PacketWriter();
writer.Encoding = connection.Encoding;
writer.Version = connection.driver.Version;
continue;
}
else if (token[0] == parameters.ParameterMarker)
{
if (SerializeParameter(writer, token))
{
continue;
}
}
// our fall through case is to write the token to the byte stream
writer.WriteStringNoNull(token);
}
// capture any buffer that is left over
MemoryStream mStream = (MemoryStream)writer.Stream;
if (mStream.Length > 0)
{
buffers.Add(mStream);
}
return(buffers);
}
