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POHow to efficiently stream an object graph as xml to sql server
 

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  1. POHow to efficiently stream an object graph as xml to sql server
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    <p>I have an object graph that I need to serialize to xml and save to a Sql Server row. I have a table with an xml data type and I've been using the SqlXml datatype, providing it a memorystream.</p> <p>This works well for the most part. However, if my object graph is especially big (~200 meg in size), I get an OutOfMemoryException. What is the most efficient way to serialize an object graph as xml and stream it to Sql Server? Here is my code right now:</p> <pre><code>using (MemoryStream ms = new MemoryStream()) { using (SqlConnection connection = new SqlConnection(this.Settings.GetConnectionString())) { connection.Open(); SqlCommand command = connection.CreateCommand(); command.CommandText = "INSERT_MESSAGE"; command.CommandType = System.Data.CommandType.StoredProcedure; SqlParameter param = command.CreateParameter(); param.ParameterName = "@PARTITION_ID"; param.Direction = System.Data.ParameterDirection.Input; param.DbType = System.Data.DbType.Int32; param.Value = this.PartitionId; command.Parameters.Add(param); param = command.CreateParameter(); param.ParameterName = "@MESSAGE"; param.Direction = System.Data.ParameterDirection.Input; param.DbType = System.Data.DbType.Xml; XmlSerializer xs = new XmlSerializer(typeof(MessageContext)); xs.Serialize(ms, message); param.Value = new System.Data.SqlTypes.SqlXml(ms); command.Parameters.Add(param); param = command.CreateParameter(); param.ParameterName = "@RETURN_VALUE"; param.Direction = System.Data.ParameterDirection.ReturnValue; param.DbType = System.Data.DbType.Int32; command.Parameters.Add(param); command.ExecuteNonQuery(); if ((int)command.Parameters["@RETURN_VALUE"].Value == 1) throw new IntegrationSystemException("Unknown error encountered while selecting the record count"); else { if (log.IsInfoEnabled) log.InfoFormat("Saved message [{0}]", message.MessageId); } } } </code></pre> <p>I am considering using a "hybridstream" like found here: <a href="http://www.danielahill.com/post/Using-a-Hybrid-Memory-Stream-to-reduce-RAM-requirements.aspx" rel="nofollow noreferrer">HybridStream</a>. This basically allocates a MemoryStream to some arbitrary limit, when that limit is hit, it creates a FileStream for the surplus.</p> <p>Optimization help would be appreciated.</p>
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