public static long Delete(RecordSet Extent, Predicate Where)
{
long n = 0;
RecordSet rs = new RecordSet(Extent.Columns);
RecordWriter w = rs.OpenWriter();
FastReadPlan plan = new FastReadPlan(Extent, Where.NOT, new FNodeSet(Extent.Columns), w);
plan.Execute();
w.Close();
n = Extent.Count - rs.Count;
Extent._Cache = rs._Cache;
return n;
//long n = 0;
//StaticRegister mem = new StaticRegister(null);
//Where.AssignRegister(mem);
//for (int i = Extent.Count - 1; i >= 0; i--)
//{
// mem.Assign(Extent[i]);
// if (Where.Render())
// {
// Extent.Remove(i);
// n++;
// }
//}
//return n;
}
// RecordSet SELECTS //
public static RecordSet SELECT(DataSet Data, FNodeSet Nodes, Predicate Where)
{
RecordSet rs = new RecordSet(Nodes.Columns);
RecordWriter w = rs.OpenWriter();
FastReadPlan plan = new FastReadPlan(Data, Where, Nodes, w);
plan.Execute();
w.Close();
return rs;
}
public override RecordSet Extend(DataSet Data, FNodeSet ClusterVariables, FNodeSet OtherKeepers, Predicate Where)
{
// Check that the ClusterVariable count matches the internal node set count //
if (ClusterVariables.Count != this._fields.Count)
throw new ArgumentException("The cluster variable count passed does not match the internal cluster variable count");
// Create the selectors //
FNodeSet values = OtherKeepers.CloneOfMe();
FNode n = new FNodeResult(null, new RowClusterCellFunction(this._rule, this._means));
foreach (FNode t in ClusterVariables.Nodes)
{
n.AddChildNode(t.CloneOfMe());
}
values.Add("CLUSTER_ID", n);
// Build a recordset //
RecordSet rs = new RecordSet(values.Columns);
RecordWriter w = rs.OpenWriter();
// Run a fast select //
FastReadPlan plan = new FastReadPlan(Data, Where, values, w);
plan.Execute();
w.Close();
return rs;
}
// Table SELECTS //
public static Table SELECT(string Dir, string Name, DataSet Data, FNodeSet Nodes, Predicate Where)
{
Table rs = new Table(Dir, Name, Nodes.Columns);
RecordWriter w = rs.OpenWriter();
FastReadPlan plan = new FastReadPlan(Data, Where, Nodes, w);
plan.Execute();
w.Close();
return rs;
}