From cb89572ef8a96b1be11daa32c2f85fdcd1e591f9 Mon Sep 17 00:00:00 2001
From: Kenneth Skovhede <kenneth@duplicati.com>
Date: Mon, 7 Jul 2025 17:04:07 +0200
Subject: [PATCH] Setting DBNull.Value for null values

---
 .../Library/Main/Database/ExtensionMethods.cs | 20 +++----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/Duplicati/Library/Main/Database/ExtensionMethods.cs b/Duplicati/Library/Main/Database/ExtensionMethods.cs
index a13f8e413..92589c59c 100644
--- a/Duplicati/Library/Main/Database/ExtensionMethods.cs
+++ b/Duplicati/Library/Main/Database/ExtensionMethods.cs
@@ -663,7 +663,7 @@ public static partial class ExtensionMethods
     public static SqliteCommand SetParameterValues(this SqliteCommand self, Dictionary<string, object?> values)
     {
         foreach (var kvp in values)
-            self.Parameters[kvp.Key].Value = kvp.Value;
+            self.Parameters[kvp.Key].Value = kvp.Value ?? DBNull.Value;
 
         return self;
     }
@@ -753,7 +753,7 @@ public static partial class ExtensionMethods
         where T : IDbCommand
     {
         foreach (var kvp in values)
-            ((IDataParameter)self.Parameters[kvp.Key]!).Value = kvp.Value;
+            ((IDataParameter)self.Parameters[kvp.Key]!).Value = kvp.Value ?? DBNull.Value;
         return self;
     }
 
@@ -772,21 +772,7 @@ public static partial class ExtensionMethods
         if (value is not null && value is System.Collections.IEnumerable && value is not string)
             throw new ArgumentException($"Cannot set parameter '{name}' to an array or enumerable type, as the SQLite bindings does not support it.", nameof(value));
 #endif
-        ((IDataParameter)self.Parameters[name]!).Value = value;
-        return self;
-    }
-
-    /// <summary>
-    /// Sets the transaction for the command.
-    /// </summary>
-    /// <typeparam name="T">The type of the command</typeparam>
-    /// <param name="self">The command to set the transaction for</param>
-    /// <param name="transaction">The transaction to set for the command</param>
-    /// <returns>The command with the transaction set</returns>
-    public static T SetTransaction<T>(this T self, IDbTransaction? transaction)
-        where T : IDbCommand
-    {
-        self.Transaction = transaction;
+        ((IDataParameter)self.Parameters[name]!).Value = value ?? DBNull.Value;
         return self;
     }