public virtual NativeTables GetTables(Schema.TableVarScope scope)
{
switch (scope)
{
case Schema.TableVarScope.Process: return(_tables == null ? _tables = new NativeTables() : _tables);
case Schema.TableVarScope.Session: return(ServerProcess.ServerSession.Tables);
case Schema.TableVarScope.Database:
default: return(Device.Tables);
}
}
protected NativeTable EnsureNativeTable(Schema.TableVar tableVar)
{
if (!tableVar.IsSessionObject && !tableVar.IsATObject)
{
tableVar.Scope = (Schema.TableVarScope)Enum.Parse(typeof(Schema.TableVarScope), MetaData.GetTag(tableVar.MetaData, "Storage.Scope", "Database"), false);
}
NativeTables tables = GetTables(tableVar.Scope);
lock (tables)
{
int index = tables.IndexOf(tableVar);
if (index < 0)
{
index = tables.Add(new NativeTable(ServerProcess.ValueManager, tableVar));
}
return(tables[index]);
}
}
protected override object InternalExecute(Program program, PlanNode planNode)
{
if (planNode is BaseTableVarNode)
{
MemoryScan scan = new MemoryScan(program, this, (BaseTableVarNode)planNode);
try
{
scan.NativeTable = EnsureNativeTable(((BaseTableVarNode)planNode).TableVar);
scan.Key = scan.NativeTable.ClusteredIndex.Key;
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
else if (planNode is OrderNode)
{
MemoryScan scan = new MemoryScan(program, this, (BaseTableVarNode)planNode.Nodes[0]);
try
{
scan.NativeTable = EnsureNativeTable(((BaseTableVarNode)planNode.Nodes[0]).TableVar);
scan.Key = ((OrderNode)planNode).PhysicalOrder;
scan.Direction = ((OrderNode)planNode).ScanDirection;
scan.Node.Order = ((OrderNode)planNode).Order;
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
else if (planNode is CreateTableVarBaseNode)
{
EnsureNativeTable(((CreateTableVarBaseNode)planNode).GetTableVar());
return(null);
}
else if (planNode is AlterTableNode)
{
// TODO: Memory device alter table support
return(null);
}
else if (planNode is DropTableNode)
{
Schema.TableVar tableVar = ((DropTableNode)planNode).Table;
NativeTables tables = GetTables(tableVar.Scope);
lock (tables)
{
int tableIndex = tables.IndexOf(tableVar);
if (tableIndex >= 0)
{
NativeTable nativeTable = tables[tableIndex];
#if USEMEMORYDEVICETRANSACTIONS
RemoveTransactionReferences(nativeTable.TableVar);
#endif
nativeTable.Drop(program.ValueManager);
tables.RemoveAt(tableIndex);
}
}
return(null);
}
else
{
throw new DeviceException(DeviceException.Codes.InvalidExecuteRequest, Device.Name, planNode.ToString());
}
}
protected override void InternalStart(ServerProcess process)
{
base.InternalStart(process);
_tables = new NativeTables();
}
