fix

builder/dao.go

@@ -405,6 +405,9 @@ func buildInsertOnDuplicate(table string, data []map[string]interface{}, update
 
 func resolveUpdate(update map[string]interface{}) (sets string, vals []interface{}) {
 	keys := make([]string, 0, len(update))
+	for key := range update {
+		keys = append(keys, key)
+	}
 	defaultSortAlgorithm(keys)
 	var sb strings.Builder
 	for _, k := range keys {
@@ -417,7 +420,7 @@ func resolveUpdate(update map[string]interface{}) (sets string, vals []interface
 			continue
 		}
 		vals = append(vals, v)
-		sets += fmt.Sprintf("%s=?,", quoteField(k))
+		sb.WriteString(fmt.Sprintf("%s=?,", quoteField(k)))
 	}
 	sets = strings.TrimRight(sb.String(), ",")
 	return sets, vals

builder/dao_test.go

@@ -118,21 +118,21 @@ func TestResolveUpdate(t *testing.T) {
 		outVals []interface{}
 	}{
 		{
-			map[string]interface{}{
+			in: map[string]interface{}{
 				"foo": "bar",
 				"bar": 1,
 			},
 			outStr:  "bar=?,foo=?",
 			outVals: []interface{}{1, "bar"},
 		},
 		{
-			map[string]interface{}{
+			in: map[string]interface{}{
 				"qq":    "ttt",
 				"some":  123,
 				"other": 456,
 			},
 			outStr:  "other=?,qq=?,some=?",
-			[]interface{}{456, "ttt", 123},
+			outVals: []interface{}{456, "ttt", 123},
 		},
 		{
 			in: map[string]interface{}{ // mysql5.7