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POSynchronizing SQL Server 2008 database with a proprietory non-SQL database using rowversion
 

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  1. POSynchronizing SQL Server 2008 database with a proprietory non-SQL database using rowversion
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    <p>I am trying to synchronize SQL Server 2008 database with a proprietory third party database. In SQL Server database, I have a SyncId column of type timestamp / rowversion in the tables that I wish to synchronize. But the third party database does not support rowversion or timestamp columns. It only supports a few basic types like string, number, date (stores only date, no time component), boolean, decimal.</p> <p>When I sync for the 1st time, I can probably store the SyncId as a string in the Third Party Database. Later on I will need to retrieve the highest available Sync Id in this third party database. How can I implement my custom comparison logic / sorting logic, so that I can get the highest Sync Id.</p> <p>Further, how do I convert the SyncId string value back to native Sql Server datatype, when sending query or stored procedure parameter to SQL Server?</p> <p>Any other ideas to implement a sync system to download incremental data changes from Sql Server 2008 to the third party database?</p> <p><strong>EDIT:</strong> While retrieving the SyncId from the SQL Server database and converting to string, I am getting an exception. The code is:</p> <pre><code> string sqlSyncId = ""; SqlCommand selectNewAnchorCommand = new SqlCommand(); string newAnchorVariable = "@sync_new_received_anchor"; selectNewAnchorCommand.CommandText = "SELECT " + newAnchorVariable + " = min_active_rowversion() - 1"; selectNewAnchorCommand.Parameters.Add(newAnchorVariable, SqlDbType.Timestamp); selectNewAnchorCommand.Parameters[newAnchorVariable].Direction = ParameterDirection.Output; selectNewAnchorCommand.Connection = conn; reader = cmd.ExecuteReader(); if (reader.Read()) { do { sqlSyncId = reader["@sync_new_received_anchor"].ToString(); } while (reader.Read()); } Stack Trace: System.IndexOutOfRangeException: @sync_new_received_anchor at System.Data.ProviderBase.FieldNameLookup.GetOrdinal(String fieldName) at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name) at System.Data.SqlClient.SqlDataReader.get_Item(String name) </code></pre> <p><strong>EDIT:</strong> I also tried:</p> <pre><code>sqlSyncId = reader["@sync_new_received_anchor"].ToString(); //same error sqlSyncId = reader[0].ToString(); //Works </code></pre> <p>Why I am not able to refer column by name?</p> <p>The value which I am receiving is 101, but in the database table, SyncId column has a different hexadecimal value.</p>
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    1. USAllSolutions
    1. USAllSolutions
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    1. COWhat is the exception you get?
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      1. POSynchronizing SQL Server 2008 database with a proprietory non-SQL database using rowversion
      1. USLajos Arpad
    2. COI have updated my question. Please check.
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      1. POSynchronizing SQL Server 2008 database with a proprietory non-SQL database using rowversion
      1. USAllSolutions
    3. COThe problem is that your "@sync_new_received_anchor" index doesn't exist, that is why the IndexOutOfBounds exception is thrown.
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      1. POSynchronizing SQL Server 2008 database with a proprietory non-SQL database using rowversion
      1. USLajos Arpad
 

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