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POSimple database table comparison using DataTable.Merge and DataTable.GetChanges
 

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    <p>We are converting our application from using Sql Server Express (let's call this version 3) to Sql Server Compact Edition (let's call this version 4). I am trying to make sure that upgrades from previous versions (versions 1 and 2) are the same in the new product (version 4) as the old (version 3). The upgrade code had to be rewritten for various reasons.</p> <p>I'm creating a quick test application that will compare a version 3 Sql Server Express database and a version 4 Sql CE database. If the conversion logic is good, the databases should be exactly equivalent--same tables, same columns, same row values.</p> <p>It would seem to me that there should be an easy way to do this using <code>DataTable.Merge</code> and <code>DataTable.GetChanges</code>, but I'm not having success. If rows exist in the version 3 database and not in the version 4 database, the <code>GetChanges</code> still returns null. If there are changes to the same rows (based on the primary key, which is a Guid), <code>GetChanges</code> still returns null.</p> <pre><code>string selectSql = String.Format("SELECT {0} FROM {1}", String.Join(", ", columns.ToArray()), tableName); var expressAdapter = new SqlDataAdapter(selectSql, expressConnection); DataTable expressTable = new DataTable(); expressAdapter.Fill(expressTable); expressTable.PrimaryKey = new DataColumn[] { expressTable.Columns[tableName + "ID"] }; SqlCeConnection ceConnection = new SqlCeConnection(this.SqlServerCeConnectionString); var ceAdapter = new SqlCeDataAdapter(selectSql, ceConnection); DataTable ceTable = expressTable.Clone(); ceAdapter.Fill(ceTable); expressTable.Merge(ceTable); return expressTable.GetChanges(); // this is null even when the expressTable has rows that do not exist in ceTable. </code></pre> <p>Am I using <code>Merge</code> and <code>GetChanges</code> in a way too far removed from their intended use? If so, other options would be welcome.</p>
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