Fix test PutOne_Update_Test

Author: junsu-msft

DataGateway.Service.Tests/SqlTests/MySqlRestApiTests.cs

@@ -402,14 +402,7 @@ public override string GetQuery(string key)
         [Ignore]
         public override Task PutOne_Insert_PKAutoGen_Test()
         {
-            throw new NotImplementedException("error: Fail, still able to insert");
-        }
-
-        [TestMethod]
-        [Ignore]
-        public override Task PutOne_Update_Test()
-        {
-            throw new NotImplementedException("error: While processing your request the server ran into an unexpected error");
+            throw new NotImplementedException("Insert success");
         }
     }
 }

DataGateway.Service/Resolvers/SqlMutationEngine.cs

@@ -124,7 +124,7 @@ await PerformMutationOperation(
                 /// In MsSQL upsert:
                 /// result set #1: result of the UPDATE operation.
                 /// result set #2: result of the INSERT operation.
-                if (await dbDataReader.NextResultAsync())
+                if (await dbDataReader.NextResultAsync() && resultRecord == null)
                 {
                     // Since no first result set exists, we overwrite Dictionary here.
                     resultRecord = await ExtractRowFromDbDataReader(dbDataReader);