- 补充 fsql.InsertOrUpdate IfExistsDoNothing 数据存在时不做任何事(不更新) #330 #316；

FreeSql/Internal/CommonProvider/InsertOrUpdateProvider.cs

@@ -19,6 +19,7 @@ namespace FreeSql.Internal.CommonProvider
         protected CommonUtils _commonUtils;
         protected CommonExpression _commonExpression;
         protected List<T1> _source = new List<T1>();
+        protected bool _doNothing = false;
         protected Dictionary<string, bool> _auditValueChangedDict = new Dictionary<string, bool>(StringComparer.CurrentCultureIgnoreCase);
         protected TableInfo _table;
         protected Func<string, string> _tableRule;
@@ -106,6 +107,12 @@ namespace FreeSql.Internal.CommonProvider
             return this;
         }
 
+        public IInsertOrUpdate<T1> IfExistsDoNothing()
+        {
+            _doNothing = true;
+            return this;
+        }
+
         protected string TableRuleInvoke()
         {
             if (_tableRule == null) return _table.DbName;