/// <summary> Gets a scalar value, calculated with the aggregate and expression specified. the field index specified is the field the expression and aggregate are applied on.</summary>
/// <param name="fieldIndex">Field index of field to which to apply the aggregate function and expression</param>
/// <param name="expressionToExecute">The expression to execute. Can be null</param>
/// <param name="aggregateToApply">Aggregate function to apply. </param>
/// <param name="filter">The filter to apply to retrieve the scalar</param>
/// <param name="relations">The relations to walk</param>
/// <param name="groupByClause">The groupby clause to apply to retrieve the scalar</param>
/// <returns>the scalar value requested</returns>
public virtual object GetScalar(ObserverDataSetFieldIndex fieldIndex, IExpression expressionToExecute, AggregateFunction aggregateToApply, IPredicate filter, IRelationCollection relations, IGroupByCollection groupByClause)
{
EntityFields fields = new EntityFields(1);
fields[0] = EntityFieldFactory.Create(fieldIndex);
if ((fields[0].ExpressionToApply == null) || (expressionToExecute != null))
{
fields[0].ExpressionToApply = expressionToExecute;
}
if ((fields[0].AggregateFunctionToApply == AggregateFunction.None) || (aggregateToApply != AggregateFunction.None))
{
fields[0].AggregateFunctionToApply = aggregateToApply;
}
ObserverDataSetDAO dao = DAOFactory.CreateObserverDataSetDAO();
return(dao.GetScalar(fields, base.Transaction, filter, relations, groupByClause));
}
/// <summary>Creates a new IEntityField instance for usage in the EntityFields object for the ObserverDataSetEntity. Which EntityField is created is specified by fieldIndex</summary>
/// <param name="fieldIndex">The field which IEntityField instance should be created</param>
/// <returns>The IEntityField instance for the field specified in fieldIndex</returns>
public static IEntityField Create(ObserverDataSetFieldIndex fieldIndex)
{
IFieldInfo info = FieldInfoProviderSingleton.GetInstance().GetFieldInfo("ObserverDataSetEntity", (int)fieldIndex);
return(new EntityField(info, PersistenceInfoProviderSingleton.GetInstance().GetFieldPersistenceInfo(info.ContainingObjectName, info.Name)));
}
/// <summary> Gets a scalar value, calculated with the aggregate and expression specified. the field index specified is the field the expression and aggregate are applied on.</summary>
/// <param name="fieldIndex">Field index of field to which to apply the aggregate function and expression</param>
/// <param name="expressionToExecute">The expression to execute. Can be null</param>
/// <param name="aggregateToApply">Aggregate function to apply. </param>
/// <returns>the scalar value requested</returns>
public object GetScalar(ObserverDataSetFieldIndex fieldIndex, IExpression expressionToExecute, AggregateFunction aggregateToApply)
{
return(GetScalar(fieldIndex, expressionToExecute, aggregateToApply, null, null, null));
}
/// <summary> Gets a scalar value, calculated with the aggregate and expression specified. the field index specified is the field the expression and aggregate are applied on.</summary>
/// <param name="fieldIndex">Field index of field to which to apply the aggregate function and expression</param>
/// <param name="expressionToExecute">The expression to execute. Can be null</param>
/// <param name="aggregateToApply">Aggregate function to apply. </param>
/// <param name="filter">The filter to apply to retrieve the scalar</param>
/// <param name="groupByClause">The groupby clause to apply to retrieve the scalar</param>
/// <returns>the scalar value requested</returns>
public object GetScalar(ObserverDataSetFieldIndex fieldIndex, IExpression expressionToExecute, AggregateFunction aggregateToApply, IPredicate filter, IGroupByCollection groupByClause)
{
return(GetScalar(fieldIndex, expressionToExecute, aggregateToApply, filter, null, groupByClause));
}
/// <summary> Gets a scalar value, calculated with the aggregate. the field index specified is the field the aggregate are applied on.</summary>
/// <param name="fieldIndex">Field index of field to which to apply the aggregate function and expression</param>
/// <param name="aggregateToApply">Aggregate function to apply. </param>
/// <returns>the scalar value requested</returns>
public object GetScalar(ObserverDataSetFieldIndex fieldIndex, AggregateFunction aggregateToApply)
{
return(GetScalar(fieldIndex, null, aggregateToApply, null, null, null));
}