/// <summary>
/// Update all entities selected by the specified query, using an anonymous initializer for specifying setters. 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 assignments expressed as an anonymous object, e.g.
/// <c>x => new { 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> UpdateAsync <TSource>(this IQueryable <TSource> source, Expression <Func <TSource, object> > expression, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return(Task.FromCanceled <int>(cancellationToken));
}
try
{
return(ExecuteUpdateAsync(source, DmlExpressionRewriter.PrepareExpressionFromAnonymous(source.Expression, expression), false, cancellationToken));
}
catch (Exception ex)
{
return(Task.FromException <int>(ex));
}
}
/// <summary>
/// Insert all entities selected by the specified query, using an anonymous initializer for specifying setters. <typeparamref name="TTarget"/>
/// must be explicitly provided, e.g. <c>source.InsertInto<Cat, Dog>(c => new {...})</c>. 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. Must be explicitly provided.</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 an anonymous object representing
/// 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, object> > expression, CancellationToken cancellationToken = default(CancellationToken))
{
if (cancellationToken.IsCancellationRequested)
{
return(Task.FromCanceled <int>(cancellationToken));
}
try
{
return(ExecuteInsertAsync <TSource, TTarget>(source, DmlExpressionRewriter.PrepareExpressionFromAnonymous(source.Expression, expression), cancellationToken));
}
catch (Exception ex)
{
return(Task.FromException <int>(ex));
}
}
/// <summary>
/// Perform an <c>update versioned</c> on all entities selected by the specified query, using an anonymous initializer for specifying setters.
/// 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 assignments expressed as an anonymous object, e.g.
/// <c>x => new { Name = x.Name, Age = x.Age + 5 }</c>. Unset members are ignored and left untouched.</param>
/// <returns>The number of updated entities.</returns>
public static int UpdateVersioned <TSource>(this IQueryable <TSource> source, Expression <Func <TSource, object> > expression)
{
return(ExecuteUpdate(source, DmlExpressionRewriter.PrepareExpressionFromAnonymous(source.Expression, expression), true));
}
/// <summary>
/// Insert all entities selected by the specified query, using an anonymous initializer for specifying setters. <typeparamref name="TTarget"/>
/// must be explicitly provided, e.g. <c>source.InsertInto<Cat, Dog>(c => new {...})</c>. 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. Must be explicitly provided.</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 an anonymous object representing
/// the entity to insert.</param>
/// <returns>The number of inserted entities.</returns>
public static int InsertInto <TSource, TTarget>(this IQueryable <TSource> source, Expression <Func <TSource, object> > expression)
{
return(ExecuteInsert <TSource, TTarget>(source, DmlExpressionRewriter.PrepareExpressionFromAnonymous(source.Expression, expression)));
}