public override DbCommand CreateSelectRangeCommand(WhereClip where, string[] columns, int topCount, int skipCount, string identyColumn, bool identyColumnIsNumber)
{
Check.Require(((object)where) != null && where.From != null, "expr and expr.From could not be null!");
Check.Require(columns != null && columns.Length > 0, "columns could not be null or empty!");
Check.Require(topCount > 0, "topCount must > 0!");
if (string.IsNullOrEmpty(where.OrderBy) && identyColumn != null)
{
where.SetOrderBy(new KeyValuePair<string,bool>[] { new KeyValuePair<string,bool>(identyColumn, false) });
}
if (topCount == int.MaxValue && skipCount == 0)
{
return CreateSelectCommand(where, columns);
}
else if (skipCount == 0)
{
return CreateSelectTopCommand(where, columns, topCount);
}
else
{
Check.Require(!string.IsNullOrEmpty(identyColumn), "identyColumn could not be null or empty!");
identyColumn = ColumnFormatter.ValidColumnName(identyColumn);
if (identyColumnIsNumber && where.OrderByStartsWith(identyColumn) && (string.IsNullOrEmpty(where.GroupBy) || where.GroupBy == identyColumn))
{
return CreateSelectRangeCommandForSortedRows(where, columns, topCount, skipCount, identyColumn, where.OrderByStartsWith(identyColumn + " DESC"));
}
else
{
return CreateSelectRangeCommandForUnsortedRows(where, columns, topCount, skipCount, identyColumn);
}
}
}
public override DbCommand CreateSelectRangeCommand(WhereClip where, string[] columns, int topCount, int skipCount, string identyColumn, bool identyColumnIsNumber)
{
//Check.Require(((object)where) != null && where.From != null, "expr and expr.From could not be null!");
//Check.Require(columns != null && columns.Length > 0, "columns could not be null or empty!");
//Check.Require(topCount > 0, "topCount must > 0!");
if (string.IsNullOrEmpty(where.OrderBy) && identyColumn != null)
{
where.SetOrderBy(new KeyValuePair <string, bool>[] { new KeyValuePair <string, bool>(identyColumn, false) });
}
if (topCount == int.MaxValue && skipCount == 0)
{
return(CreateSelectCommand(where, columns));
}
else if (skipCount == 0)
{
return(CreateSelectTopCommand(where, columns, topCount));
}
else
{
//Check.Require(!string.IsNullOrEmpty(identyColumn), "identyColumn could not be null or empty!");
identyColumn = ColumnFormatter.ValidColumnName(identyColumn);
if (identyColumnIsNumber && where.OrderByStartsWith(identyColumn) && (string.IsNullOrEmpty(where.GroupBy) || where.GroupBy == identyColumn))
{
return(CreateSelectRangeCommandForSortedRows(where, columns, topCount, skipCount, identyColumn, where.OrderByStartsWith(identyColumn + " DESC")));
}
else
{
return(CreateSelectRangeCommandForUnsortedRows(where, columns, topCount, skipCount, identyColumn));
}
}
}
