public static string GetSelectSql <TModel>(ObjectQuery <TModel> query, IEnumerable <string> selectedProperties, DbCommand command = null,
IBatchRunner runner = null, IList <string> fields = null)
{
if (selectedProperties == null || selectedProperties.Count() < 1)
{
throw new ArgumentException("The selected properties must be defined.", "selectedProperties");
}
var selector = new StringBuilder(string.Join(",", selectedProperties)).Insert(0, "new (").Append(")");
var selectQuery = DynamicQueryable.Select(query, selector.ToString());
var objectQuery = selectQuery as ObjectQuery;
if (objectQuery == null)
{
throw new ArgumentException("The query must be of type ObjectQuery.", "query");
}
string selectSql = objectQuery.ToTraceString();
if (command != null)
{
objectQuery.Parameters.CopyTo(command, runner: runner);
}
if (fields != null)
{
fields.Clear();
var maps = new NonPublicMember(objectQuery).GetProperty("QueryState").GetField("_cachedPlan").GetField("CommandDefinition")
.GetField("_columnMapGenerators").Idx(0).GetField("_columnMap").GetProperty("Element").GetProperty("Properties").Value as Array;
foreach (var m in maps)
{
var mm = new NonPublicMember(m);
int pos = (int)mm.GetProperty("ColumnPos").Value;
string name = (string)mm.GetProperty("Name").Value;
while (pos + 1 > fields.Count)
{
fields.Add(null);
}
fields[pos] = name;
}
}
return(selectSql);
}
public static IList <string> GetPropertyPositions(IQueryable query, IList <string> fields = null)
{
if (fields == null)
{
fields = new List <string>();
}
fields.Clear();
var objectQuery = query as ObjectQuery;
var maps = new NonPublicMember(objectQuery).GetProperty("QueryState").GetField("_cachedPlan").GetField("CommandDefinition")
.GetField("_columnMapGenerators").Idx(0).GetField("_columnMap").GetProperty("Element").GetProperty("Properties").Value as Array;
foreach (var m in maps)
{
var mm = new NonPublicMember(m);
int pos = (int)mm.GetProperty("ColumnPos").Value;
string name = (string)mm.GetProperty("Name").Value;
while (pos + 1 > fields.Count)
{
fields.Add(null); //advance the size of [fields] if the pos index is not covered by it
}
fields[pos] = name;
}
return(fields);
}