From dde9b6f74eef9df47a579d37e2e1c6309924da5c Mon Sep 17 00:00:00 2001
From: zhoujie <zhoujie@manabox.cn>
Date: Thu, 19 Sep 2024 14:11:17 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E5=8E=BB=E6=8E=89=E4=BA=86=E6=89=B9?=
 =?UTF-8?q?=E9=87=8F=E6=9F=A5=E8=AF=A2=E6=97=B6=EF=BC=8C=E7=BB=93=E6=9E=9C?=
 =?UTF-8?q?=E4=B8=BA=E7=A9=BA=E7=9A=84=E6=8A=A5=E9=94=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md  |  4 ++--
 mapping.go | 10 +++-------
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 631fbe3..8c3e4d4 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,7 @@ INSERT INTO
 ### 查询映射 -- 示例
 
 ```go
+// 如果没有结果，会返回 sql.ErrNoRows
 func QueryOne(db *sql.DB) (*User,error){
     tdMapper := NewMapper()
 
@@ -89,8 +90,7 @@ func QueryOne(db *sql.DB) (*User,error){
     return &user, nil
 }
 
-// 如果查询结果数量为0，则返回 sql.ErrNoRows
-// var ErrNoRows = errors.New("sql: no rows in result set")
+// 如果查询结果数量为0，不会返回错误
 func QueryAll(db *sql.DB)([]*User, error) {
     tdMapper := NewMapper()
     
diff --git a/mapping.go b/mapping.go
index 005fd81..6d2d32b 100644
--- a/mapping.go
+++ b/mapping.go
@@ -247,10 +247,6 @@ func (b *Mapper) ScanRowsWithContext(ctx context.Context, target any, rows *sql.
 			// 将新实例添加到slice中
 			vf.Set(reflect.Append(vf, newStruct))
 		}
-
-		if vf.Len() == 0 { // 如果slice为空，返回 sql.ErrNoRows
-			return sql.ErrNoRows
-		}
 		return nil
 	default:
 		return errors.New("target must be a pointer to a struct or a slice of structs")
@@ -277,11 +273,11 @@ func (b *Mapper) scanRow(target reflect.Value, rows *sql.Rows) error {
 	dest := make([]interface{}, len(columns))
 	for i, colName := range columns {
 		// 拿到缓存的字段索引
-		if idx, ok := mate.DBName2IndexCache[colName]; ok {
-			dest[i] = target.FieldByIndex(idx).Addr().Interface()
-		} else {
+		idx, ok := mate.DBName2IndexCache[colName]
+		if !ok {
 			return fmt.Errorf("no corresponding field found for column %s", colName)
 		}
+		dest[i] = target.FieldByIndex(idx).Addr().Interface()
 	}
 
 	// 扫描数据