Allow opting out of RETURNING/OUTPUT clauses in SaveChanges

Fixes dotnet#29916

src/EFCore.Relational/Extensions/RelationalEntityTypeExtensions.cs

@@ -1458,8 +1458,7 @@ public static bool IsTableExcludedFromMigrations(this IReadOnlyEntityType entity
         }
 
         var ownership = entityType.FindOwnership();
-        if (ownership != null
-            && ownership.IsUnique)
+        if (ownership is { IsUnique: true })
         {
             return ownership.PrincipalEntityType.IsTableExcludedFromMigrations();
         }

src/EFCore.Relational/Extensions/RelationalForeignKeyExtensions.cs

@@ -154,9 +154,14 @@ public static IEnumerable<IForeignKeyConstraint> GetMappedConstraints(this IFore
         this IReadOnlyForeignKey foreignKey,
         in StoreObjectIdentifier storeObject)
     {
+        if (foreignKey.PrincipalEntityType.GetTableName() is not { } principalTableName)
+        {
+            return null;
+        }
+
         var foreignKeyName = foreignKey.GetConstraintName(
             storeObject,
-            StoreObjectIdentifier.Table(foreignKey.PrincipalEntityType.GetTableName()!, foreignKey.PrincipalEntityType.GetSchema()));
+            StoreObjectIdentifier.Table(principalTableName, foreignKey.PrincipalEntityType.GetSchema()));
         var rootForeignKey = foreignKey;
 
         // Limit traversal to avoid getting stuck in a cycle (validation will throw for these later)
@@ -168,11 +173,16 @@ public static IEnumerable<IForeignKeyConstraint> GetMappedConstraints(this IFore
                          .FindRowInternalForeignKeys(storeObject)
                          .SelectMany(fk => fk.PrincipalEntityType.GetForeignKeys()))
             {
+                principalTableName = otherForeignKey.PrincipalEntityType.GetTableName();
+
+                if (principalTableName is null)
+                {
+                    return null;
+                }
+
                 if (otherForeignKey.GetConstraintName(
                         storeObject,
-                        StoreObjectIdentifier.Table(
-                            otherForeignKey.PrincipalEntityType.GetTableName()!,
-                            otherForeignKey.PrincipalEntityType.GetSchema()))
+                        StoreObjectIdentifier.Table(principalTableName, otherForeignKey.PrincipalEntityType.GetSchema()))
                     == foreignKeyName)
                 {
                     linkedForeignKey = otherForeignKey;

src/EFCore.Relational/Extensions/RelationalTriggerExtensions.cs

@@ -108,9 +108,19 @@ public static void SetDatabaseName(this IMutableTrigger trigger, string? name)
     /// </summary>
     /// <param name="trigger">The trigger.</param>
     /// <returns>The name of the table on which this trigger is defined.</returns>
-    public static string? GetTableName(this IReadOnlyTrigger trigger)
-        => (string?)trigger.FindAnnotation(RelationalAnnotationNames.TableName)?.Value
-            ?? trigger.EntityType.GetTableName()!;
+    public static string GetTableName(this IReadOnlyTrigger trigger)
+    {
+        if (trigger.FindAnnotation(RelationalAnnotationNames.TableName) is { Value: string tableName })
+        {
+            return tableName;
+        }
+
+        var mainTableName = trigger.EntityType.GetTableName();
+
+        Check.DebugAssert(mainTableName is not null, "Trigger defined on entity not mapped to a table");
+
+        return mainTableName;
+    }
 
     /// <summary>
     ///     Sets the name of the table on which this trigger is defined.

src/EFCore.Relational/Infrastructure/RelationalModelValidator.cs

@@ -2474,8 +2474,16 @@ protected override void ValidateTriggers(
         IModel model,
         IDiagnosticsLogger<DbLoggerCategory.Model.Validation> logger)
     {
-        foreach (var entityType in model.GetEntityTypes())
+        foreach (var entityType in model.GetEntityTypes().Where(e => e.GetDeclaredTriggers().Any()))
         {
+            if (entityType.BaseType is not null
+                && entityType.GetMappingStrategy() == RelationalAnnotationNames.TphMappingStrategy)
+            {
+                throw new InvalidOperationException(
+                    RelationalStrings.CannotConfigureTriggerNonRootTphEntity(
+                        entityType.DisplayName(), entityType.GetRootType().DisplayName()));
+            }
+
             var tableName = entityType.GetTableName();
             var tableSchema = entityType.GetSchema();
 

src/EFCore.Relational/Metadata/Builders/OwnedNavigationSplitTableBuilder.cs

@@ -57,6 +57,12 @@ public virtual string? Schema
     public virtual IMutableEntityTypeMappingFragment MappingFragment
         => InternalMappingFragment;
 
+    /// <summary>
+    ///     The entity type being configured.
+    /// </summary>
+    public virtual IMutableEntityType Metadata
+        => OwnedNavigationBuilder.OwnedEntityType;
+
     private OwnedNavigationBuilder OwnedNavigationBuilder { get; }
 
     /// <summary>

src/EFCore.Relational/Metadata/Builders/SplitTableBuilder.cs

@@ -57,6 +57,12 @@ public virtual string? Schema
     public virtual IMutableEntityTypeMappingFragment MappingFragment
         => InternalMappingFragment;
 
+    /// <summary>
+    ///     The entity type being configured.
+    /// </summary>
+    public virtual IMutableEntityType Metadata
+        => EntityTypeBuilder.Metadata;
+
     private EntityTypeBuilder EntityTypeBuilder { get; }
 
     /// <summary>

src/EFCore.Relational/Properties/RelationalStrings.resx

@@ -130,6 +130,9 @@
   <data name="CannotChangeWhenOpen" xml:space="preserve">
     <value>The instance of DbConnection is currently in use. The connection can only be changed when the existing connection is not being used.</value>
   </data>
+  <data name="CannotConfigureTriggerNonRootTphEntity" xml:space="preserve">
+    <value>Can't configure a trigger on entity type '{entityType}', which is in a TPH hierarchy and isn't the root. Configure the trigger on the TPH root entity type '{rootEntityType}' instead.</value>
+  </data>
   <data name="ClientGroupByNotSupported" xml:space="preserve">
     <value>Unable to translate the given 'GroupBy' pattern. Call 'AsEnumerable' before 'GroupBy' to evaluate it client-side.</value>
   </data>

src/EFCore.SqlServer/Extensions/SqlServerEntityTypeExtensions.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using Microsoft.EntityFrameworkCore.SqlServer.Internal;
 using Microsoft.EntityFrameworkCore.SqlServer.Metadata.Internal;
 
 // ReSharper disable once CheckNamespace
@@ -18,6 +19,8 @@ public static class SqlServerEntityTypeExtensions
 {
     private const string DefaultHistoryTableNameSuffix = "History";
 
+    #region Memory-optimized table
+
     /// <summary>
     ///     Returns a value indicating whether the entity type is mapped to a memory-optimized table.
     /// </summary>
@@ -58,6 +61,10 @@ public static void SetIsMemoryOptimized(this IMutableEntityType entityType, bool
     public static ConfigurationSource? GetIsMemoryOptimizedConfigurationSource(this IConventionEntityType entityType)
         => entityType.FindAnnotation(SqlServerAnnotationNames.MemoryOptimized)?.GetConfigurationSource();
 
+    #endregion Memory-optimized table
+
+    #region Temporal table
+
     /// <summary>
     ///     Returns a value indicating whether the entity type is mapped to a temporal table.
     /// </summary>
@@ -271,4 +278,149 @@ public static void SetHistoryTableSchema(this IMutableEntityType entityType, str
     /// <returns>The configuration source for the temporal history table schema setting.</returns>
     public static ConfigurationSource? GetHistoryTableSchemaConfigurationSource(this IConventionEntityType entityType)
         => entityType.FindAnnotation(SqlServerAnnotationNames.TemporalHistoryTableSchema)?.GetConfigurationSource();
+
+    #endregion Temporal table
+
+    #region SQL OUTPUT clause
+
+    /// <summary>
+    ///     Returns a value indicating whether to use the SQL OUTPUT clause when saving changes to the table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <returns><see langword="true" /> if the SQL OUTPUT clause is used to save changes to the table.</returns>
+    public static bool IsSqlOutputClauseUsed(this IReadOnlyEntityType entityType)
+    {
+        if (entityType.FindAnnotation(SqlServerAnnotationNames.UseSqlOutputClause) is { Value: bool useSqlOutputClause })
+        {
+            return useSqlOutputClause;
+        }
+
+        if (entityType.FindOwnership() is { } ownership
+            && StoreObjectIdentifier.Create(entityType, StoreObjectType.Table) is { } tableIdentifier
+            && ownership.FindSharedObjectRootForeignKey(tableIdentifier) is { } rootForeignKey)
+        {
+            return rootForeignKey.PrincipalEntityType.IsSqlOutputClauseUsed();
+        }
+
+        if (entityType.BaseType is not null && entityType.GetMappingStrategy() == RelationalAnnotationNames.TphMappingStrategy)
+        {
+            return entityType.GetRootType().IsSqlOutputClauseUsed();
+        }
+
+        return true;
+    }
+
+    /// <summary>
+    ///     Sets a value indicating whether to use the SQL OUTPUT clause when saving changes to the table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <param name="useSqlOutputClause">The value to set.</param>
+    public static void UseSqlOutputClause(this IMutableEntityType entityType, bool? useSqlOutputClause)
+        => entityType.SetOrRemoveAnnotation(SqlServerAnnotationNames.UseSqlOutputClause, useSqlOutputClause);
+
+    /// <summary>
+    ///     Sets a value indicating whether to use the SQL OUTPUT clause when saving changes to the table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <param name="useSqlOutputClause">The value to set.</param>
+    /// <param name="fromDataAnnotation">Indicates whether the configuration was specified using a data annotation.</param>
+    /// <returns>The configured value.</returns>
+    public static bool? UseSqlOutputClause(
+        this IConventionEntityType entityType,
+        bool? useSqlOutputClause,
+        bool fromDataAnnotation = false)
+        => (bool?)entityType.SetOrRemoveAnnotation(
+            SqlServerAnnotationNames.UseSqlOutputClause,
+            useSqlOutputClause,
+            fromDataAnnotation)?.Value;
+
+    /// <summary>
+    ///     Gets the configuration source for whether to use the SQL OUTPUT clause when saving changes to the table.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <returns>The configuration source for the memory-optimized setting.</returns>
+    public static ConfigurationSource? GetUseSqlOutputClauseConfigurationSource(this IConventionEntityType entityType)
+        => entityType.FindAnnotation(SqlServerAnnotationNames.UseSqlOutputClause)?.GetConfigurationSource();
+
+    /// <summary>
+    ///     Returns a value indicating whether to use the SQL OUTPUT clause when saving changes to the specified table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <param name="storeObject">The identifier of the table-like store object.</param>
+    /// <returns>A value indicating whether the SQL OUTPUT clause is used to save changes to the associated table.</returns>
+    public static bool IsSqlOutputClauseUsed(this IReadOnlyEntityType entityType, in StoreObjectIdentifier storeObject)
+    {
+        if (entityType.FindMappingFragment(storeObject) is { } overrides
+            && overrides.FindAnnotation(SqlServerAnnotationNames.UseSqlOutputClause) is { Value: bool useSqlOutputClause })
+        {
+            return useSqlOutputClause;
+        }
+
+        if (StoreObjectIdentifier.Create(entityType, storeObject.StoreObjectType) == storeObject)
+        {
+            return entityType.IsSqlOutputClauseUsed();
+        }
+
+        if (entityType.FindOwnership() is { } ownership
+            && ownership.FindSharedObjectRootForeignKey(storeObject) is { } rootForeignKey)
+        {
+            return rootForeignKey.PrincipalEntityType.IsSqlOutputClauseUsed(storeObject);
+        }
+
+        if (entityType.BaseType is not null && entityType.GetMappingStrategy() == RelationalAnnotationNames.TphMappingStrategy)
+        {
+            return entityType.GetRootType().IsSqlOutputClauseUsed(storeObject);
+        }
+
+        return true;
+    }
+
+    /// <summary>
+    ///     Sets a value indicating whether to use the SQL OUTPUT clause when saving changes to the table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <param name="useSqlOutputClause">The value to set.</param>
+    /// <param name="storeObject">The identifier of the table-like store object.</param>
+    public static void UseSqlOutputClause(
+        this IMutableEntityType entityType,
+        bool? useSqlOutputClause,
+        in StoreObjectIdentifier storeObject)
+    {
+        if (StoreObjectIdentifier.Create(entityType, storeObject.StoreObjectType) == storeObject)
+        {
+            entityType.UseSqlOutputClause(useSqlOutputClause);
+            return;
+        }
+
+        entityType
+            .GetOrCreateMappingFragment(storeObject)
+            .UseSqlOutputClause(useSqlOutputClause);
+    }
+
+    /// <summary>
+    ///     Sets a value indicating whether to use the SQL OUTPUT clause when saving changes to the table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="entityType">The entity type.</param>
+    /// <param name="useSqlOutputClause">The value to set.</param>
+    /// <param name="storeObject">The identifier of the table-like store object.</param>
+    /// <param name="fromDataAnnotation">Indicates whether the configuration was specified using a data annotation.</param>
+    /// <returns>The configured value.</returns>
+    public static bool? UseSqlOutputClause(
+        this IConventionEntityType entityType,
+        bool? useSqlOutputClause,
+        in StoreObjectIdentifier storeObject,
+        bool fromDataAnnotation = false)
+        => StoreObjectIdentifier.Create(entityType, storeObject.StoreObjectType) == storeObject
+            ? entityType.UseSqlOutputClause(useSqlOutputClause, fromDataAnnotation)
+            : entityType
+                .GetOrCreateMappingFragment(storeObject, fromDataAnnotation)
+                .UseSqlOutputClause(useSqlOutputClause, fromDataAnnotation);
+
+    #endregion SQL OUTPUT clause
 }

src/EFCore.SqlServer/Extensions/SqlServerEntityTypeMappingFragmentExtensions.cs

@@ -0,0 +1,53 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.EntityFrameworkCore.SqlServer.Metadata.Internal;
+
+// ReSharper disable once CheckNamespace
+namespace Microsoft.EntityFrameworkCore;
+
+/// <summary>
+///     SQL Server specific extension methods for <see cref="IReadOnlyEntityTypeMappingFragment" />.
+/// </summary>
+public static class SqlServerEntityTypeMappingFragmentExtensions
+{
+    /// <summary>
+    ///     Returns a value indicating whether to use the SQL OUTPUT clause when saving changes to the associated table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="fragment">The entity type mapping fragment.</param>
+    /// <returns>The configured value.</returns>
+    public static bool IsSqlOutputClauseUsed(this IReadOnlyEntityTypeMappingFragment fragment)
+        => fragment.FindAnnotation(SqlServerAnnotationNames.UseSqlOutputClause) is not { Value: false };
+
+    /// <summary>
+    ///     Sets whether to use the SQL OUTPUT clause when saving changes to the associated table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="fragment">The entity type mapping fragment.</param>
+    /// <param name="useSqlOutputClause">The value to set.</param>
+    public static void UseSqlOutputClause(this IMutableEntityTypeMappingFragment fragment, bool? useSqlOutputClause)
+        => fragment.SetAnnotation(SqlServerAnnotationNames.UseSqlOutputClause, useSqlOutputClause);
+
+    /// <summary>
+    ///     Sets whether to use the SQL OUTPUT clause when saving changes to the associated table.
+    ///     The OUTPUT clause is incompatible with certain SQL Server features, such as tables with triggers.
+    /// </summary>
+    /// <param name="fragment">The entity type mapping fragment.</param>
+    /// <param name="useSqlOutputClause">The value to set.</param>
+    /// <param name="fromDataAnnotation">Indicates whether the configuration was specified using a data annotation.</param>
+    /// <returns>The configured value.</returns>
+    public static bool? UseSqlOutputClause(
+        this IConventionEntityTypeMappingFragment fragment,
+        bool? useSqlOutputClause,
+        bool fromDataAnnotation = false)
+        => (bool?)fragment.SetAnnotation(SqlServerAnnotationNames.UseSqlOutputClause, useSqlOutputClause, fromDataAnnotation)?.Value;
+
+    /// <summary>
+    ///     Gets the configuration source for the setting whether to use the SQL OUTPUT clause when saving changes to the associated table.
+    /// </summary>
+    /// <param name="fragment">The entity type mapping fragment.</param>
+    /// <returns>The configuration source for the configured value.</returns>
+    public static ConfigurationSource? GetUseSqlOutputClauseConfigurationSource(this IConventionEntityTypeMappingFragment fragment)
+        => fragment.FindAnnotation(SqlServerAnnotationNames.UseSqlOutputClause)?.GetConfigurationSource();
+}