diff --git a/Examples/base_entity/Program.cs b/Examples/base_entity/Program.cs
index a644f48f..84b9f7da 100644
--- a/Examples/base_entity/Program.cs
+++ b/Examples/base_entity/Program.cs
@@ -400,6 +400,10 @@ namespace base_entity
 
         static void Main(string[] args)
         {
+            var pams = new Dictionary<string, string>();
+            var sql2rscs = Utils.ReplaceSqlConstString("'', 'SARTEN ACERO VITR.18CM''''GRAFIT''''', 'a",
+                pams, "@lantin1");
+
             using (IFreeSql client = CreateInstance(@"Driver={Microsoft Access Driver (*.mdb)};DBQ=d:/accdb/2007.accdb", DataType.Odbc))
             {
                 Dictionary<string, object> data = new Dictionary<string, object>();
@@ -409,8 +413,8 @@ namespace base_entity
                 data.Add("PType", "RS");
                 data.Add("GType", "窨井轮廓线");
                 data.Add("LineStyle", 2);
-                data.Add("Memo", null);
-                data.Add("ClassID", null);
+                data.Add("Memo", DBNull.Value);
+                data.Add("ClassID", DBNull.Value);
                 var kdkdksqlxx = client.InsertDict(data).AsTable("FZLINE").ToSql();
             }
 
diff --git a/FreeSql/Internal/UtilsExpressionTree.cs b/FreeSql/Internal/UtilsExpressionTree.cs
index 1edaf42c..023e8c31 100644
--- a/FreeSql/Internal/UtilsExpressionTree.cs
+++ b/FreeSql/Internal/UtilsExpressionTree.cs
@@ -2458,6 +2458,7 @@ namespace FreeSql.Internal
                     }
                     if (sidx < sql.Length && sql[sidx] == '\'')
                     {
+                        sidx++;
                         startLength += 2;
                         continue;
                     }