/// <summary>
/// This method generate query definition from LINQ query.
/// </summary>
/// <typeparam name="T">the type of object to query.</typeparam>
/// <param name="query">the IQueryable{T} to be converted.</param>
/// <returns>The queryDefinition which can be used in query execution.</returns>
/// <example>
/// This example shows how to generate query definition from LINQ.
///
/// <code language="c#">
/// <![CDATA[
/// IQueryable<T> queryable = container.GetItemsQueryIterator<T>(allowSynchronousQueryExecution = true)
/// .Where(t => b.id.contains("test"));
/// QueryDefinition queryDefinition = queryable.ToQueryDefinition();
/// ]]>
/// </code>
/// </example>
public static QueryDefinition ToQueryDefinition <T>(this IQueryable <T> query)
{
CosmosLinqQuery <T> linqQuery = query as CosmosLinqQuery <T>;
if (linqQuery == null)
{
throw new ArgumentOutOfRangeException(nameof(linqQuery), "ToSqlQueryText is only supported on cosmos LINQ query operations");
}
return(linqQuery.ToQueryDefinition());
}
/// <summary>
/// This extension method gets the FeedIterator from LINQ IQueryable to execute query asynchronously.
/// This will create the fresh new FeedIterator when called.
/// </summary>
/// <typeparam name="T">the type of object to query.</typeparam>
/// <param name="query">the IQueryable{T} to be converted.</param>
/// <returns>An iterator to go through the items.</returns>
/// <example>
/// This example shows how to get FeedIterator from LINQ.
///
/// <code language="c#">
/// <![CDATA[
/// IOrderedQueryable<ToDoActivity> linqQueryable = this.Container.GetItemLinqQueryable<ToDoActivity>();
/// FeedIterator setIterator = linqQueryable.Where(item => (item.taskNum < 100)).ToFeedIterator()
/// ]]>
/// </code>
/// </example>
public static FeedIterator ToStreamIterator <T>(this IQueryable <T> query)
{
CosmosLinqQuery <T> linqQuery = query as CosmosLinqQuery <T>;
if (linqQuery == null)
{
throw new ArgumentOutOfRangeException(nameof(linqQuery), "ToStreamFeedIterator is only supported on cosmos LINQ query operations");
}
return(linqQuery.ToStreamIterator());
}
//Sync execution of query via direct invoke on IQueryProvider.
public object Execute(Expression expression)
{
Type cosmosQueryType = typeof(CosmosLinqQuery <bool>).GetGenericTypeDefinition().MakeGenericType(typeof(object));
CosmosLinqQuery <object> documentQuery = (CosmosLinqQuery <object>)Activator.CreateInstance(
cosmosQueryType,
this.container,
this.cosmosJsonSerializer,
this.queryClient,
this.cosmosQueryRequestOptions,
this.allowSynchronousQueryExecution);
return(documentQuery.ToList().FirstOrDefault());
}
public TResult Execute <TResult>(Expression expression)
{
Type cosmosQueryType = typeof(CosmosLinqQuery <bool>).GetGenericTypeDefinition().MakeGenericType(typeof(TResult));
CosmosLinqQuery <TResult> cosmosLINQQuery = (CosmosLinqQuery <TResult>)Activator.CreateInstance(
cosmosQueryType,
this.container,
this.cosmosJsonSerializer,
this.queryClient,
this.cosmosQueryRequestOptions,
expression,
this.allowSynchronousQueryExecution);
this.onExecuteScalarQueryCallback?.Invoke(cosmosLINQQuery);
return(cosmosLINQQuery.ToList().FirstOrDefault());
}
//Sync execution of query via direct invoke on IQueryProvider.
public object Execute(Expression expression)
{
Type cosmosQueryType = typeof(CosmosLinqQuery <bool>).GetGenericTypeDefinition().MakeGenericType(typeof(object));
CosmosLinqQuery <object> cosmosLINQQuery = (CosmosLinqQuery <object>)Activator.CreateInstance(
cosmosQueryType,
this.container,
this.responseFactory,
this.queryClient,
this.continuationToken,
this.cosmosQueryRequestOptions,
this.allowSynchronousQueryExecution);
this.onExecuteScalarQueryCallback?.Invoke(cosmosLINQQuery);
return(cosmosLINQQuery.ToList().FirstOrDefault());
}
public async Task <Response <TResult> > ExecuteAggregateAsync <TResult>(
Expression expression,
CancellationToken cancellationToken = default(CancellationToken))
{
Type cosmosQueryType = typeof(CosmosLinqQuery <bool>).GetGenericTypeDefinition().MakeGenericType(typeof(TResult));
CosmosLinqQuery <TResult> cosmosLINQQuery = (CosmosLinqQuery <TResult>)Activator.CreateInstance(
cosmosQueryType,
this.container,
this.responseFactory,
this.queryClient,
this.continuationToken,
this.cosmosQueryRequestOptions,
expression,
this.allowSynchronousQueryExecution,
this.serializationOptions);
return(await cosmosLINQQuery.AggregateResultAsync());
}