Update oracle exp to sql

Src/Asp.Net/OracleTest/Demo/Demo1_Queryable.cs

@@ -61,6 +61,7 @@ namespace OrmTest
             var test04 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Second, DateTime.Now, DateTime.Now.AddMinutes(2))).ToList();
             var test05 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Minute, DateTime.Now, DateTime.Now.AddMinutes(21))).ToList();
             var test06 = db.Queryable<Order>().Select(it => SqlFunc.DateDiff(DateType.Hour, DateTime.Now, DateTime.Now.AddHours(3))).ToList();
+            var test07 = db.Queryable<Order>().Select(it => it.CreateTime.DayOfWeek.ToString()).ToList();
             Console.WriteLine("#### Examples End ####");
         }
 

Src/Asp.Net/SqlSugar/Realization/Oracle/SqlBuilder/OracleExpressionContext.cs

@@ -153,6 +153,8 @@ namespace SqlSugar
                     return string.Format("(CAST(TO_CHAR({0},'mi') AS NUMBER))", parameter.MemberName);
                 case DateType.Millisecond:
                     return string.Format("(CAST(TO_CHAR({0},'ff3') AS NUMBER))", parameter.MemberName);
+                case DateType.Weekday:
+                    return $" to_char({parameter.MemberName},'day') ";
                 case DateType.Day:
                 default:
                     return string.Format("(CAST(TO_CHAR({0},'dd') AS NUMBER))", parameter.MemberName);