Add db.Ado.IsValidConnectionNoClose

Src/Asp.Net/SqlSugar/Abstract/AdoProvider/AdoProvider.cs

@@ -87,6 +87,18 @@ namespace SqlSugar
                 return false;
             }
         }
+        public virtual bool IsValidConnectionNoClose()
+        {
+            try
+            {
+                this.Open();
+                return true;
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+        }
         public virtual void Open()
         {
             CheckConnection();

Src/Asp.Net/SqlSugar/Interface/IAdo.cs

@@ -165,6 +165,7 @@ namespace SqlSugar
         void Open();
         SugarConnection OpenAlways();
         bool IsValidConnection();
+        bool IsValidConnectionNoClose();
         void CheckConnection();
 
         void BeginTran();