fix err msg

dao/dao-exam-record.go

@@ -315,6 +315,9 @@ func AdminExamRecordDetail(id int) *result.Result {
 	if err != nil {
 		return result.UNKNOW_ERROR.SetMsg(err.Error())
 	}
+	if answerStr == nil {
+		return result.UNKNOW_ERROR.SetMsg("试卷数据不存在!")
+	}
 
 	var avs []*vo.AnswerVo
 	err = json.Unmarshal([]byte(*answerStr), &avs)

result/result.go

@@ -44,7 +44,6 @@ func NewPage(page, size, total int, data interface{}) *Page {
 	}
 }
 
-
 // ResultChange 影响行数
 type ResultChange struct {
 	RowsAffected int64 `json:"rowsAffected"`
@@ -52,7 +51,7 @@ type ResultChange struct {
 }
 
 func NewResultChange(row int64) ResultChange {
-	return ResultChange{row,0}
+	return ResultChange{row, 0}
 }
 
 var (