修复数据库及时间bug

common/objtoobj.go

@@ -156,7 +156,7 @@ func ObjToTime(obj interface{}, e ...*Error) *time.Time {
 		}
 	}
 
-	return &time.Time{}
+	return nil
 }
 
 func ObjToFloat64(obj interface{}, e ...*Error) float64 {

db/hotimedb.go

@@ -379,6 +379,7 @@ func (that *HoTimeDB) Exec(query string, args ...interface{}) (sql.Result, *Erro
 			}
 			return that.Exec(query, args...)
 		}
+		return resl, that.LastErr
 	}
 
 	return resl, that.LastErr