public override IQueryFilter GetUniqueFilter()
{
if (UniqueFilterProvider != null)
{
return(UniqueFilterProvider());
}
else
{
var colFilter = new FeatureColumns();
return(colFilter.KeyColumn == IdValue);
}
}
public static long Count(WhereDelegate <FeatureColumns> where, Database database = null)
{
FeatureColumns c = new FeatureColumns();
IQueryFilter filter = where (c);
Database db = database ?? Db.For <Feature>();
QuerySet query = GetQuerySet(db);
query.Count <Feature>();
query.Where(filter);
query.Execute(db);
return(query.Results.As <CountResult>(0).Value);
}
public static Feature GetOneWhere(WhereDelegate <FeatureColumns> where, Database database = null)
{
var result = OneWhere(where, database);
if (result == null)
{
FeatureColumns c = new FeatureColumns();
IQueryFilter filter = where (c);
result = CreateFromFilter(filter, database);
}
return(result);
}
public static async Task BatchQuery <ColType>(int batchSize, WhereDelegate <FeatureColumns> where, Action <IEnumerable <Feature> > batchProcessor, Bam.Net.Data.OrderBy <FeatureColumns> orderBy, Database database = null)
{
await Task.Run(async() =>
{
FeatureColumns columns = new FeatureColumns();
var results = Top(batchSize, where, orderBy, database);
while (results.Count > 0)
{
await Task.Run(() =>
{
batchProcessor(results);
});
ColType top = results.Select(d => d.Property <ColType>(orderBy.Column.ToString())).ToArray().Largest();
results = Top(batchSize, (FeatureColumns) where (columns) && orderBy.Column > top, orderBy, database);
}
});
}
public static async Task BatchQuery(int batchSize, WhereDelegate <FeatureColumns> where, Action <IEnumerable <Feature> > batchProcessor, Database database = null)
{
await Task.Run(async() =>
{
FeatureColumns columns = new FeatureColumns();
var orderBy = Bam.Net.Data.Order.By <FeatureColumns>(c => c.KeyColumn, Bam.Net.Data.SortOrder.Ascending);
var results = Top(batchSize, where, orderBy, database);
while (results.Count > 0)
{
await Task.Run(() =>
{
batchProcessor(results);
});
long topId = results.Select(d => d.Property <long>(columns.KeyColumn.ToString())).ToArray().Largest();
results = Top(batchSize, (FeatureColumns) where (columns) && columns.KeyColumn > topId, orderBy, database);
}
});
}
public static FeatureCollection Top(int count, WhereDelegate <FeatureColumns> where, OrderBy <FeatureColumns> orderBy, Database database = null)
{
FeatureColumns c = new FeatureColumns();
IQueryFilter filter = where (c);
Database db = database ?? Db.For <Feature>();
QuerySet query = GetQuerySet(db);
query.Top <Feature>(count);
query.Where(filter);
if (orderBy != null)
{
query.OrderBy <FeatureColumns>(orderBy);
}
query.Execute(db);
var results = query.Results.As <FeatureCollection>(0);
results.Database = db;
return(results);
}