private void BeforeDeserializing(StreamingContext context)
{
Schema = CSSchema.Get(typeof(TObjectType));
if (!string.IsNullOrEmpty(Schema.DefaultSortExpression))
{
OrderBy = Schema.DefaultSortExpression;
}
}
private void Initialize()
{
if (_schema == null)
{
_schema = CSSchema.Get(GetType());
}
_dataState = CSObjectDataState.New;
_fieldData = new CSFieldValueCollection(this);
}
private static object GetScalar(string fieldName, string tableAlias, CSAggregate aggregate, CSFilter queryFilter, string orderBy)
{
CSSchema schema = CSSchema.Get(typeof(T));
if (tableAlias == null)
{
tableAlias = CSNameGenerator.NextTableAlias;
}
if (orderBy == null)
{
orderBy = "";
}
string aggregateExpr = null;
int maxRows = 0;
switch (aggregate)
{
case CSAggregate.None: aggregateExpr = "{0}"; maxRows = 1; break;
case CSAggregate.Sum: aggregateExpr = "sum({0})"; break;
case CSAggregate.SumDistinct: aggregateExpr = "sum(distinct {0})"; break;
case CSAggregate.Count: aggregateExpr = "count(*)"; break;
case CSAggregate.CountDistinct: aggregateExpr = "count(distinct {0})"; break;
case CSAggregate.Avg: aggregateExpr = "avg({0})"; break;
case CSAggregate.AvgDistinct: aggregateExpr = "avg(distinct {0})"; break;
case CSAggregate.Max: aggregateExpr = "max({0})"; break;
case CSAggregate.Min: aggregateExpr = "min({0})"; break;
}
CSJoinList joins = new CSJoinList();
if (fieldName != "*")
{
fieldName = CSExpressionParser.ParseFilter(fieldName, schema, tableAlias, joins);
}
string whereFilter = CSExpressionParser.ParseFilter(queryFilter.Expression, schema, tableAlias, joins);
orderBy = CSExpressionParser.ParseOrderBy(orderBy, schema, tableAlias, joins);
string sqlQuery = schema.DB.BuildSelectSQL(schema.TableName, tableAlias, new[] { String.Format(aggregateExpr, fieldName) }, null, joins.BuildJoinExpressions(), whereFilter, orderBy, 1, maxRows, false, false);
return(schema.DB.GetScalar(sqlQuery, queryFilter.Parameters));
}
public CSList()
: base(CSSchema.Get(typeof(TObjectType)))
{
}
