public override IEnumerable <FreeDocument> Generate(IFreeDocument document = null)
{
var mount = 0;
if (Mount < 0)
{
mount = int.MaxValue;
}
TableInfo table = TableNames.SelectItem;
if (table != null)
{
var con = new VirtualDataCollection(table.GetVirtualProvider <IFreeDocument>());
foreach (var item in con.ComputeData.Skip(Position).Take(mount).Select(d => d.DictSerialize()))
{
yield return(item);
}
}
}
public override IEnumerable<IFreeDocument> Generate(IFreeDocument document = null)
{
var mount = 0;
if (Mount < 0)
mount = int.MaxValue;
var table = this.ConnectorSelector.SelectItem?.RefreshTableNames().FirstOrDefault(d=>d.Name== TableNames.SelectItem);
if (table != null)
{
var con = new VirtualDataCollection(table.GetVirtualProvider<IFreeDocument>());
foreach (var item in con.ComputeData.Take(mount))
{
if(item!=null)
yield return item;
}
}
}
public DataCollection ReadCollection(IDataBaseConnector connector, string tableName, bool isVirtual)
{
if (isVirtual)
{
IItemsProvider <IFreeDocument> vir = null;
TableInfo tableInfo = connector.RefreshTableNames().FirstOrDefault(d => d.Name == tableName);
var enumable = connector as IEnumerableProvider <IFreeDocument>;
if (enumable != null && enumable.CanSkip(tableInfo.Name) == false)
{
vir = new EnumableVirtualProvider <IFreeDocument>(
enumable.GetEnumerable(tableInfo.Name), tableInfo.Size);
}
else
{
vir = new DataBaseVirtualProvider <IFreeDocument>(tableInfo.Connector, tableInfo.Name);
}
int count = 1000;
if (connector.TypeName == "网页爬虫连接器")
{
count = 100;
}
var col = new VirtualDataCollection(vir, count)
{
Name = tableInfo.Name
};
AddDataCollection(col);
return(col);
}
else
{
Task <List <IFreeDocument> > datas = GetDataFromDB(connector, tableName, true);
DataCollection col = AddDataCollection(datas.Result);
return(col);
}
}
