/// <summary>
/// Creates an TSQL Count(1) statement
/// </summary>
/// <typeparam name="TPoco">The type of the poco.</typeparam>
/// <typeparam name="TOut">The type of the out.</typeparam>
/// <param name="query">The query.</param>
/// <returns></returns>
private static ElementProducer <TOut> Sum <TPoco, TOut>(this IElementProducer <TPoco> query)
{
IQueryBuilder newQuery = new RootQuery(query.ContainerObject.AccessLayer);
//in case there is a grouping in the query, we must use a SubQuery
var ordering = query.ContainerObject.SearchLast <OrderByColumnQueryPart>();
var cteName = query.ContainerObject.CreateAlias(QueryIdentifier.QueryIdTypes.Cte);
var item = new CteDefinitionQueryPart.CteInfo()
{
Name = cteName
};
item.CteContentParts.AddRange(query.ContainerObject.Parts.Except(new IQueryPart[] { ordering }).ToArray());
var cteQueryPart = query.ContainerObject.SearchLast <CteDefinitionQueryPart>();
newQuery = newQuery.Add(cteQueryPart ?? (cteQueryPart = new CteDefinitionQueryPart()))
.Add(cteQueryPart.AddCte(item));
var subQueryId = query.ContainerObject.CreateAlias(QueryIdentifier.QueryIdTypes.SubQuery);
var countQueryPart = newQuery
.Add(new CountTargetQueryPart(cteName, subQueryId));
if (ordering != null)
{
var orderByColumnQueryPart = new OrderByColumnQueryPart();
orderByColumnQueryPart.Descending = ordering.Descending;
orderByColumnQueryPart.Columns = orderByColumnQueryPart.Columns
.Select(f => new ColumnInfo(f.ColumnName, f, subQueryId, query.ContainerObject)).ToList();
countQueryPart.Add(orderByColumnQueryPart);
}
return(new ElementProducer <TOut>(countQueryPart));
}
/// <summary>
/// Creates a CTE on the start of the Query
/// </summary>
/// <returns></returns>
public RootQuery WithCte <T>(IElementProducer <T> commandQuery, out QueryIdentifier cteName)
{
IQueryBuilder newQuery = new RootQuery(this);
cteName = newQuery.ContainerObject.CreateAlias(QueryIdentifier.QueryIdTypes.Cte);
(commandQuery.ContainerObject as IQueryContainerValues)?.TableAlias.Clear();
var cteQueryPart = commandQuery.ContainerObject.SearchLast <CteDefinitionQueryPart>();
newQuery = newQuery.Add(cteQueryPart ?? (cteQueryPart = new CteDefinitionQueryPart()));
var cteInfo = new CteDefinitionQueryPart.CteInfo();
cteInfo.Name = cteName;
cteInfo.CteContentParts.AddRange(commandQuery.ContainerObject.Parts);
return(new RootQuery(newQuery.Add(cteQueryPart.AddCte(cteInfo))));
}
