Clone DbParameter when adding to command if ICloneable

src/EFCore.Relational/Storage/Internal/RawRelationalParameter.cs

@@ -1,7 +1,9 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.Generic;
+using System.Data;
 using System.Data.Common;
 using JetBrains.Annotations;
 using Microsoft.EntityFrameworkCore.Utilities;
@@ -62,6 +64,13 @@ public override void AddDbParameter(DbCommand command, IReadOnlyDictionary<strin
         /// </summary>
         public override void AddDbParameter(DbCommand command, object value)
         {
+            if (value is DbParameter dbParameter
+                && dbParameter.Direction == ParameterDirection.Input
+                && value is ICloneable cloneable)
+            {
+                value = cloneable.Clone();
+            }
+
             command.Parameters.Add(value);
         }
     }

test/EFCore.Relational.Specification.Tests/Query/FromSqlQueryTestBase.cs

@@ -987,6 +987,24 @@ public virtual void Line_endings_after_Select()
             Assert.NotNull(actual);
         }
 
+        [ConditionalFact]
+        public virtual void FromSql_with_db_parameter_in_split_query()
+        {
+            using var context = CreateContext();
+
+            var actual = context.Set<Customer>()
+                .FromSqlRaw(NormalizeDelimitersInRawString("SELECT * FROM [Customers] WHERE [CustomerID] = {0}"),
+                    CreateDbParameter("customerID", "ALFKI"))
+                .Include(e => e.Orders)
+                .ThenInclude(o => o.OrderDetails)
+                .AsSplitQuery()
+                .ToArray();
+
+            var customer = Assert.Single(actual);
+            Assert.Equal(6, customer.Orders.Count);
+            Assert.Equal(12, customer.Orders.SelectMany(e => e.OrderDetails).Count());
+        }
+
         protected string NormalizeDelimitersInRawString(string sql)
             => Fixture.TestStore.NormalizeDelimitersInRawString(sql);
 

test/EFCore.SqlServer.FunctionalTests/Query/FromSqlQuerySqlServerTest.cs

@@ -799,6 +799,39 @@ public override void Line_endings_after_Select()
 WHERE [c].[City] = N'Seattle'");
         }
 
+        public override void FromSql_with_db_parameter_in_split_query()
+        {
+            base.FromSql_with_db_parameter_in_split_query();
+
+            AssertSql(
+                @"customerID='ALFKI' (Nullable = false) (Size = 5)
+
+SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
+FROM (
+    SELECT * FROM ""Customers"" WHERE ""CustomerID"" = @customerID
+) AS [c]
+ORDER BY [c].[CustomerID]",
+                //
+                @"customerID='ALFKI' (Nullable = false) (Size = 5)
+
+SELECT [o].[OrderID], [o].[CustomerID], [o].[EmployeeID], [o].[OrderDate], [c].[CustomerID]
+FROM (
+    SELECT * FROM ""Customers"" WHERE ""CustomerID"" = @customerID
+) AS [c]
+INNER JOIN [Orders] AS [o] ON [c].[CustomerID] = [o].[CustomerID]
+ORDER BY [c].[CustomerID], [o].[OrderID]",
+                //
+                @"customerID='ALFKI' (Nullable = false) (Size = 5)
+
+SELECT [o0].[OrderID], [o0].[ProductID], [o0].[Discount], [o0].[Quantity], [o0].[UnitPrice], [c].[CustomerID], [o].[OrderID]
+FROM (
+    SELECT * FROM ""Customers"" WHERE ""CustomerID"" = @customerID
+) AS [c]
+INNER JOIN [Orders] AS [o] ON [c].[CustomerID] = [o].[CustomerID]
+INNER JOIN [Order Details] AS [o0] ON [o].[OrderID] = [o0].[OrderID]
+ORDER BY [c].[CustomerID], [o].[OrderID]");
+        }
+
         protected override DbParameter CreateDbParameter(string name, object value)
             => new SqlParameter { ParameterName = name, Value = value };