private CollectionSortInfo ConvertToColumnName(CollectionSortInfo _SortingInfo)
{
bool success = true;
DbStatementResultSetInfo resultSetinfo = DbStatementResultSetInfoProvider.GetDbStatementInfo(StatementName);
if (resultSetinfo == null)
{
success = false;
}
else
{
foreach (FieldSortInfo fsi in _SortingInfo.SortInfoList)
{
string colName = resultSetinfo.GetMappedColumn(fsi.FieldName);
if (!string.IsNullOrEmpty(colName))
{
fsi.FieldName = colName;
}
else
{
success = false;
break;
}
}
}
if (!success)
{
_SortingInfo.SortInfoList = null;
}
return(_SortingInfo);
}
protected void AttachSortInfoModifier(CollectionSortInfo sortInfo, string storedProcedureName)
{
if (sortInfo != null && sortInfo.IsValid)
{
ContainsStatementModifiers = true;
DbStatementSortingModifier.CreateModifier(sortInfo, storedProcedureName);
}
}
private DbStatementSortingModifier(CollectionSortInfo sortingInfo, string statementName)
{
if (sortingInfo != null && sortingInfo.IsValid && (!string.IsNullOrEmpty(statementName)))
{
StatementName = statementName;
_SortingInfo = sortingInfo;
_IsValid = true;
}
else
{
_IsValid = false;
}
}
public override string ProcessStatement(string originalStatement)
{
string val = originalStatement;
if (_IsValid)
{
CollectionSortInfo columnSortinfo = ConvertToColumnName(_SortingInfo);
if (columnSortinfo.IsValid)
{
val = ModifyStatementForSorting(columnSortinfo, originalStatement);
}
}
return(val);
}
private string ModifyStatementForSorting(CollectionSortInfo columnSortinfo, string originalStatement)
{
const string OrderByStart = "ROW_NUMBER()";
const string OrderByEnd = "RowNumber";
const string OrderByMid = @" OVER (ORDER BY {0}) as ";
const string OrderByFragmentFormat = OrderByStart + OrderByMid + OrderByEnd;
string newOrderByFrag = string.Format(OrderByFragmentFormat, GetOrderByClause(columnSortinfo));
StringBuilder sb = new StringBuilder(originalStatement);
int startIdx = originalStatement.IndexOf(OrderByStart);
int endIdx = originalStatement.IndexOf(OrderByEnd);
if (startIdx != -1 && endIdx != -1)
{
sb.Remove(startIdx, endIdx - startIdx + 1 + OrderByEnd.Length).Insert(startIdx, newOrderByFrag);
}
return(sb.ToString());
}
private string GetOrderByClause(CollectionSortInfo columnSortinfo)
{
StringBuilder sb = new StringBuilder();
foreach (FieldSortInfo fsi in columnSortinfo.SortInfoList)
{
sb.AppendFormat(@"{0} {1},", fsi.FieldName, fsi.SortOrder);
}
string val;
if (sb.Length > 0)
{
val = sb.ToString(0, sb.Length - 1);
}
else
{
val = null;
}
return(val);
}
public static void CreateModifier(CollectionSortInfo sortingInfo, string statementName)
{
(new DbStatementSortingModifier(sortingInfo, statementName)).AddToModificationManager();
}
