Implement ExecuteUpdate

Resolves #795

src/EFCore.Relational/Extensions/RelationalQueryableExtensions.cs

@@ -236,7 +236,7 @@ internal static readonly MethodInfo AsSplitQueryMethodInfo
     #region ExecuteDelete
 
     /// <summary>
-    ///     Deletes all entity instances which match the LINQ query from the database.
+    ///     Deletes all database rows for the entity instances which match the LINQ query from the database.
     /// </summary>
     /// <remarks>
     ///     <para>
@@ -251,12 +251,12 @@ internal static readonly MethodInfo AsSplitQueryMethodInfo
     ///     </para>
     /// </remarks>
     /// <param name="source">The source query.</param>
-    /// <returns>The total number of entity instances deleted from the database.</returns>
+    /// <returns>The total number of rows deleted in the database.</returns>
     public static int ExecuteDelete<TSource>(this IQueryable<TSource> source)
         => source.Provider.Execute<int>(Expression.Call(ExecuteDeleteMethodInfo.MakeGenericMethod(typeof(TSource)), source.Expression));
 
     /// <summary>
-    ///     Asynchronously deletes all entity instances which match the LINQ query from the database.
+    ///     Asynchronously deletes database rows for the entity instances which match the LINQ query from the database.
     /// </summary>
     /// <remarks>
     ///     <para>
@@ -272,7 +272,7 @@ public static int ExecuteDelete<TSource>(this IQueryable<TSource> source)
     /// </remarks>
     /// <param name="source">The source query.</param>
     /// <param name="cancellationToken">A <see cref="CancellationToken" /> to observe while waiting for the task to complete.</param>
-    /// <returns>The total number of entity instances deleted from the database.</returns>
+    /// <returns>The total number of rows deleted in the database.</returns>
     public static Task<int> ExecuteDeleteAsync<TSource>(this IQueryable<TSource> source, CancellationToken cancellationToken = default)
         => source.Provider is IAsyncQueryProvider provider
             ? provider.ExecuteAsync<Task<int>>(
@@ -283,4 +283,64 @@ internal static readonly MethodInfo ExecuteDeleteMethodInfo
         = typeof(RelationalQueryableExtensions).GetTypeInfo().GetDeclaredMethod(nameof(ExecuteDelete))!;
 
     #endregion
+
+    #region ExecuteUpdate
+
+    /// <summary>
+    ///     Updates all database rows for the entity instances which match the LINQ query from the database.
+    /// </summary>
+    /// <remarks>
+    ///     <para>
+    ///         This operation executes immediately against the database, rather than being deferred until
+    ///         <see cref="DbContext.SaveChanges()" /> is called. It also does not interact with the EF change tracker in any way:
+    ///         entity instances which happen to be tracked when this operation is invoked aren't taken into account, and aren't updated
+    ///         to reflect the changes.
+    ///     </para>
+    ///     <para>
+    ///         See <see href="https://aka.ms/efcore-docs-bulk-operations">Executing bulk operations with EF Core</see>
+    ///         for more information and examples.
+    ///     </para>
+    /// </remarks>
+    /// <param name="source">The source query.</param>
+    /// <param name="setPropertyStatements">A collection of set property statements specifying properties to update.</param>
+    /// <returns>The total number of rows updated in the database.</returns>
+    public static int ExecuteUpdate<TSource>(
+        this IQueryable<TSource> source,
+        Expression<Func<SetPropertyStatements<TSource>, SetPropertyStatements<TSource>>> setPropertyStatements)
+        => source.Provider.Execute<int>(
+            Expression.Call(ExecuteUpdateMethodInfo.MakeGenericMethod(typeof(TSource)), source.Expression, setPropertyStatements));
+
+    /// <summary>
+    ///     Asynchronously updates database rows for the entity instances which match the LINQ query from the database.
+    /// </summary>
+    /// <remarks>
+    ///     <para>
+    ///         This operation executes immediately against the database, rather than being deferred until
+    ///         <see cref="DbContext.SaveChanges()" /> is called. It also does not interact with the EF change tracker in any way:
+    ///         entity instances which happen to be tracked when this operation is invoked aren't taken into account, and aren't updated
+    ///         to reflect the changes.
+    ///     </para>
+    ///     <para>
+    ///         See <see href="https://aka.ms/efcore-docs-bulk-operations">Executing bulk operations with EF Core</see>
+    ///         for more information and examples.
+    ///     </para>
+    /// </remarks>
+    /// <param name="source">The source query.</param>
+    /// <param name="setPropertyStatements">A collection of set property statements specifying properties to update.</param>
+    /// <param name="cancellationToken">A <see cref="CancellationToken" /> to observe while waiting for the task to complete.</param>
+    /// <returns>The total number of rows updated in the database.</returns>
+    public static Task<int> ExecuteUpdateAsync<TSource>(
+        this IQueryable<TSource> source,
+        Expression<Func<SetPropertyStatements<TSource>, SetPropertyStatements<TSource>>> setPropertyStatements,
+        CancellationToken cancellationToken = default)
+        => source.Provider is IAsyncQueryProvider provider
+            ? provider.ExecuteAsync<Task<int>>(
+                Expression.Call(
+                    ExecuteUpdateMethodInfo.MakeGenericMethod(typeof(TSource)), source.Expression, setPropertyStatements), cancellationToken)
+            : throw new InvalidOperationException(CoreStrings.IQueryableProviderNotAsync);
+
+    internal static readonly MethodInfo ExecuteUpdateMethodInfo
+        = typeof(RelationalQueryableExtensions).GetTypeInfo().GetDeclaredMethod(nameof(ExecuteUpdate))!;
+
+    #endregion
 }