/// <summary>
/// Perform an <c>update versioned</c> on all entities selected by the specified query. The update operation is performed in the database without
/// reading the entities out of it.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
/// <param name="source">The query matching the entities to update.</param>
/// <param name="expression">The update setters expressed as a member initialization of updated entities, e.g.
/// <c>x => new Dog { Name = x.Name, Age = x.Age + 5 }</c>. Unset members are ignored and left untouched.</param>
/// <param name="cancellationToken">A cancellation token that can be used to cancel the work</param>
/// <returns>The number of updated entities.</returns>
public static Task <int> UpdateVersionedAsync <TSource>(this IQueryable <TSource> source, Expression <Func <TSource, TSource> > expression, CancellationToken cancellationToken = default(CancellationToken))
{
if (cancellationToken.IsCancellationRequested)
{
return(Task.FromCanceled <int>(cancellationToken));
}
try {
return(ExecuteUpdateAsync(source, DmlExpressionRewriter.PrepareExpression(source.Expression, expression), true, cancellationToken));
} catch (Exception ex) {
return(Task.FromException <int>(ex));
}
}
/// <summary>
/// Insert all entities selected by the specified query. The insert operation is performed in the database without reading the entities out of it.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
/// <typeparam name="TTarget">The type of the entities to insert.</typeparam>
/// <param name="source">The query matching entities source of the data to insert.</param>
/// <param name="expression">The expression projecting a source entity to the entity to insert.</param>
/// <param name="cancellationToken">A cancellation token that can be used to cancel the work</param>
/// <returns>The number of inserted entities.</returns>
public static Task <int> InsertIntoAsync <TSource, TTarget>(this IQueryable <TSource> source, Expression <Func <TSource, TTarget> > expression, CancellationToken cancellationToken = default(CancellationToken))
{
if (cancellationToken.IsCancellationRequested)
{
return(Task.FromCanceled <int>(cancellationToken));
}
try {
return(ExecuteInsertAsync <TSource, TTarget>(source, DmlExpressionRewriter.PrepareExpression(source.Expression, expression), cancellationToken));
} catch (Exception ex) {
return(Task.FromException <int>(ex));
}
}
/// <summary> /// Perform an <c>update versioned</c> on the entities. The update operation is performed in the database without reading the entities out of it. /// </summary> /// <returns>The number of updated entities.</returns> public int UpdateVersioned() => _source.ExecuteUpdate(DmlExpressionRewriter.PrepareExpression <TSource>(_source.Expression, _assignments.List), true);