/// <summary>
/// NOTE: This is called by the dOOdad framework and you should never call it. We reserve the right to remove or change this method.
/// </summary>
/// <param name="wItem">The AggregateParameter</param>
public void AddAggregateParameter(AggregateParameter wItem)
{
if (_aggregateParameters == null)
{
_aggregateParameters = new ArrayList();
}
_aggregateParameters.Add(wItem);
// We don't allow Save() to succeed once they reduce the columns
this._entity._canSave = false;
}
protected string GetAggregate(AggregateParameter wItem, bool withAlias)
{
string query = string.Empty;
switch (wItem.Function)
{
case AggregateParameter.Func.Avg:
query += "AVG(";
break;
case AggregateParameter.Func.Count:
query += "COUNT(";
break;
case AggregateParameter.Func.Max:
query += "MAX(";
break;
case AggregateParameter.Func.Min:
query += "MIN(";
break;
case AggregateParameter.Func.Sum:
query += "SUM(";
break;
case AggregateParameter.Func.StdDev:
query += "STDEV(";
break;
case AggregateParameter.Func.Var:
query += "VAR(";
break;
}
if (wItem.Distinct)
{
query += "DISTINCT ";
}
query += "[" + wItem.Column + "])";
if (withAlias && wItem.Alias != string.Empty)
{
// Need DBMS string delimiter here
query += " AS '" + wItem.Alias + "'";
}
return(query);
}
public override void AddGroupBy(AggregateParameter aggregate)
{
// SQL Server does not support aggregates in a GROUP BY.
// Common method
base.AddGroupBy(GetAggregate(aggregate, false));
}
public override void AddOrderBy(AggregateParameter aggregate, PIKCV.DAO.WhereParameter.Dir direction)
{
base.AddOrderBy(GetAggregate(aggregate, false), direction);
}
/// <summary>
/// Overloaded to support aggregates.
/// Derived classes implement this, like SqlClientDynamicQuery and OleDbDynamicQuery
/// to account for differences in DBMS systems.
/// </summary>
/// <param name="aggregate">This should be an entry from your Aggregate class</param>
/// <example>
/// <code>
/// emps.Query.AddGroupBy(emps.Aggregate.City)</code>
/// </example>
public virtual void AddGroupBy(AggregateParameter aggregate)
{
}
/// <summary>
/// Overloaded to support aggregates.
/// Derived classes implement this, like SqlClientDynamicQuery and OleDbDynamicQuery
/// to account for differences in DBMS systems.
/// </summary>
/// <param name="aggregate">This should be an entry from your Aggregate class</param>
/// <param name="direction">Either Descending or Ascending</param>
/// <example>
/// <code>
/// emps.Query.AddOrderBy(emps.Aggregate.CategoryID, WhereParameter.Dir.ASC)</code>
/// </example>
public virtual void AddOrderBy(AggregateParameter aggregate, WhereParameter.Dir direction)
{
}