private void GenerateKeyAndAffectedEntitySets(IQueryable <T> source, string customKey = null)
{
var objectQuery = DbCacheUtil.GetObjectQuery(source) ?? source as ObjectQuery;
var key = customKey.NullEmpty();
if (objectQuery != null && string.IsNullOrEmpty(key))
{
var commandInfo = objectQuery.GetCommandInfo();
var sb = new StringBuilder();
sb.AppendLine(commandInfo.Sql);
foreach (DbParameter parameter in commandInfo.Parameters)
{
sb.Append(parameter.ParameterName);
sb.Append(";");
sb.Append(parameter.Value);
sb.AppendLine(";");
}
key = sb.ToString();
}
Key = key;
AffectedEntitySets = objectQuery != null
? objectQuery.GetAffectedEntitySets()
: new string[0];
}
private void EnsureObjectQuery()
{
if (!_objectQueryResolved && _objectQuery == null)
{
_objectQuery = DbCacheUtil.GetObjectQuery(_source) ?? _source as ObjectQuery;
_objectQueryResolved = true;
}
}
/// <summary>
/// Forces query results to be cached.
/// Allows caching results for queries using non-deterministic functions.
/// </summary>
/// <typeparam name="T">Query element type.</typeparam>
/// <param name="source">Query whose results will be cached. Must not be null.</param>
public static IQueryable <T> Cached <T>(this IQueryable <T> source)
where T : class
{
Guard.NotNull(source, nameof(source));
// TODO: implement Uncached()
var objectQuery = DbCacheUtil.GetObjectQuery(source) ?? source as ObjectQuery;
if (objectQuery != null)
{
SingletonQueries.Current.AddCachedQuery(
objectQuery.Context.MetadataWorkspace,
objectQuery.ToTraceString());
}
return(source);
}
