diff --git a/db.go b/db.go
index b44b883..6d7f5f6 100644
--- a/db.go
+++ b/db.go
@@ -694,9 +694,11 @@ func (this *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 	} else if k == "[#]" {
 		k = strings.Replace(k, "[#]", "", -1)
 		where += " " + ObjToStr(v) + " "
-	} else {
+	} else  {
 		//fmt.Println(reflect.ValueOf(v).Type().String())
-		if reflect.ValueOf(v).Type().String() == "hotime.Slice" {
+		if v==nil{
+			where += "`" + k + "` IS NULL"
+		}else if reflect.ValueOf(v).Type().String() == "hotime.Slice" {
 
 			//fmt.Println(v)
 			where += "`" + k + "` IN ("
@@ -721,13 +723,9 @@ func (this *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 				//res=append(res,(v.(Slice))[i])
 			}
 		} else {
-			if v!=nil{
+
 				where += "`" + k + "`=? "
 				res = append(res, v)
-			}else{
-				where += "`" + k + "` IS NULL"
-				//res = append(res, v)
-			}
 
 		}
 	}
@@ -739,7 +737,11 @@ func (this *HoTimeDB) varCond(k string, v interface{}) (string, []interface{}) {
 func (this *HoTimeDB) notIn(k string, v interface{}, where string, res []interface{}) (string, []interface{}) {
 	//where:=""
 	//fmt.Println(reflect.ValueOf(v).Type().String())
-	if reflect.ValueOf(v).Type().String() == "hotime.Slice" {
+	if v==nil{
+
+		where += "`" + k + "` IS NOT NULL "
+
+	}else if reflect.ValueOf(v).Type().String() == "hotime.Slice" {
 		where += "`" + k + "` NOT IN ("
 		res = append(res, (v.(Slice))...)
 		for i := 0; i < len(v.(Slice)); i++ {
@@ -762,12 +764,10 @@ func (this *HoTimeDB) notIn(k string, v interface{}, where string, res []interfa
 			//res=append(res,(v.(Slice))[i])
 		}
 	} else {
-		if v!=nil{
+
 			where += "`" + k + "` !=? "
 			res = append(res, v)
-		}else{
-			where += "`" + k + "` IS NOT NULL "
-		}
+
 
 	}