Entity framework delete all entities extension method
Published
Unfortunately when deleting items in entity framework the SQL commands are issued as single DELETE statements for each entity. This really becomes a bottleneck when there are a several thousand items. This handy set of extension methods allows convenient and efficient deletion of all entities for a particular type T. The GetTableName<T> used function even takes into account table mappings set up with the ModelBuilder.
Thanks to Rul Jarimba on Stack Overflow for the GetTableName<T> function.
public static void DeleteAllEntities<T>(this DbContext db)
where T : class
{
var adapter = (IObjectContextAdapter)db;
var objectContext = adapter.ObjectContext;
var sql = string.Format("DELETE FROM {0}", objectContext.GetTableName<T>());
var entityConnection = objectContext.ExecuteStoreCommand(sql);
}
public static string GetTableName<T>(this ObjectContext context)
where T : class
{
string sql = context.CreateObjectSet<T>().ToTraceString();
Regex regex = new Regex("FROM (?<table>.*) AS");
Match match = regex.Match(sql);
string table = match.Groups["table"].Value;
return table;
}
