diff --git a/DAL/DalBase.cs b/DAL/DalBase.cs
index 0ff9571d..0d8a0343 100644
--- a/DAL/DalBase.cs
+++ b/DAL/DalBase.cs
@@ -622,6 +622,10 @@ protected virtual void AddReturnPara() { }
 
         private void SetCommandText(string commandText, bool isProc)
         {
+            if (_com == null && DebugInfo.Length > 0)
+            {
+                throw new Exception("DalBase.SetCommandText stop running because : " + DebugInfo.ToString());
+            }
             if (OracleDal.clientType > 0)
             {
                 Type t = _com.GetType();
diff --git a/SQL/Schema/DBSchema.cs b/SQL/Schema/DBSchema.cs
index 52ac0b0f..3898a43b 100644
--- a/SQL/Schema/DBSchema.cs
+++ b/SQL/Schema/DBSchema.cs
@@ -156,16 +156,4 @@ public static void InitDBSchemasForCache(object para)
             }
         }
     }
-
-    internal class SchemaPara
-    {
-        public SchemaPara(string conn, bool isGetColumn)
-        {
-            Conn = conn;
-            IsGetColumn = isGetColumn;
-        }
-        public string Conn;
-        public bool IsGetColumn;
-    }
-
 }