/// <summary>
/// Retrieves a collection of entities based on the query and allows you to perform an action against each one.
/// </summary>
/// <param name="query">A TsQuery object containing a TableQuery.</param>
/// <param name="action">The action to perform on each item returned by the query.</param>
/// <returns></returns>
public async Task <BatchProcessResult> BatchProcessAsync(TsQuery query, Func <List <T>, Task> action)
{
if (query == null)
{
throw new ArgumentNullException("query");
}
if (action == null)
{
throw new ArgumentNullException("action");
}
TableContinuationToken continuationToken = null;
var tableQuery = new TableQuery <T>().Where(query.Query).Take(MAX_BATCH_COUNT);
var batches = 0;
var entitiesProcessed = 0;
do
{
var tableQueryResult = await _table.ExecuteQuerySegmentedAsync(tableQuery, continuationToken);
continuationToken = tableQueryResult.ContinuationToken;
await action(tableQueryResult.Results);
entitiesProcessed += tableQueryResult.Results.Count;
if (tableQueryResult.Results.Count > 0)
{
batches++;
}
}while (continuationToken != null);
return(new BatchProcessResult(batches, entitiesProcessed));
}
/// <summary>
/// Allows you to perform a query on the against the table.
/// Warning this could result in a table scan being executed.
/// </summary>
/// <param name="query">A TsQuery object containing a TableQuery.</param>
/// <returns></returns>
public async Task <IEnumerable <T> > QueryAsync(TsQuery query)
{
var returnList = new List <T>();
TableContinuationToken continuationToken = null;
var tableQuery = new TableQuery <T>().Where(query.Query).Take(MAX_BATCH_COUNT);
do
{
var tableQueryResult = await _table.ExecuteQuerySegmentedAsync(tableQuery, continuationToken);
returnList.AddRange(tableQueryResult.Results);
continuationToken = tableQueryResult.ContinuationToken;
}while (continuationToken != null);
return(returnList);
}
/// <summary>
/// Deletes all the entites from the table based upon the provided query.
/// </summary>
/// <param name="query">A TsQuery object containing a TableQuery.</param>
/// <returns></returns>
public async Task <BatchDeleteResult> BatchDeleteAsync(TsQuery query)
{
if (query == null)
{
throw new ArgumentNullException("query");
}
TableContinuationToken continuationToken = null;
var tableQuery = new TableQuery <T>().Where(query.Query).Take(MAX_BATCH_COUNT);
var batches = 0;
var deleteBatches = 0;
var entitiesDeleted = 0;
List <T> entitiesToDelete = new List <T>();
do
{
var tableQueryResult = await _table.ExecuteQuerySegmentedAsync(tableQuery, continuationToken);
continuationToken = tableQueryResult.ContinuationToken;
entitiesToDelete.AddRange(tableQueryResult.Results);
if (tableQueryResult.Results.Count > 0)
{
batches++;
}
}while (continuationToken != null);
var results = await DeleteInBatchesAsync(entitiesToDelete);
deleteBatches += results.Item1;
entitiesDeleted += results.Item2;
return(new BatchDeleteResult(batches, deleteBatches, entitiesDeleted));
}
