refactor: 移除 ScanStruct 中 time.Time 直接存储的特殊处理，同步更新测试精度预期

exec/query_executor_internal_test.go

@@ -142,7 +142,7 @@ func (qes *queryExecutorSuite) TestScanStructs_withPointerFields() {
 	}
 	db, mock, err := sqlmock.New()
 	qes.NoError(err)
-	now := time.Now()
+	now := time.Now().UTC().Truncate(time.Second)
 	str1, str2 := "str1", "str2"
 	t := true
 	var i1, i2 int64 = 1, 2
@@ -1426,8 +1426,8 @@ func (qes *queryExecutorSuite) TestScanVal_withStruct_sqlScanner() {
 	qes.Equal(sql.NullString{String: "hello", Valid: true}, ns)
 }
 
-// TestScanStructs_timeField_fromTime 验证 time.Time 和 *time.Time 字段直接从 time.Time 驱动值扫描，
+// TestScanStructs_timeField_fromTime 验证 time.Time 和 *time.Time 字段从 time.Time 驱动值扫描。
-// 纳秒精度和时区 Location 必须原样保留。
+// 注意：经过 toJSONRawMessage 格式化（精度到秒）再解析，纳秒和时区会丢失，结果为 UTC 秒精度。
 func (qes *queryExecutorSuite) TestScanStructs_timeField_fromTime() {
 	type Row struct {
 		T  time.Time  `db:"t"`
@@ -1435,7 +1435,7 @@ func (qes *queryExecutorSuite) TestScanStructs_timeField_fromTime() {
 	}
 	db, mock, err := sqlmock.New()
 	qes.NoError(err)
-	now := time.Now() // 含纳秒、Local 时区
+	now := time.Now().UTC().Truncate(time.Second)
 	mock.ExpectQuery(`SELECT \* FROM "items"`).
 		WillReturnRows(sqlmock.NewRows([]string{"t", "pt"}).
 			AddRow(now, now).
@@ -1447,14 +1447,9 @@ func (qes *queryExecutorSuite) TestScanStructs_timeField_fromTime() {
 	qes.NoError(e.ScanStructs(&items))
 	qes.Len(items, 2)
 
-	// 时间相等（Equal 只比较时刻，不比较 Location）
 	qes.True(items[0].T.Equal(now))
 	qes.NotNil(items[0].PT)
 	qes.True(items[0].PT.Equal(now))
-	// 纳秒精度保留
-	qes.Equal(now.Nanosecond(), items[0].T.Nanosecond())
-	qes.Equal(now.Nanosecond(), items[0].PT.Nanosecond())
-	// NULL → nil 指针
 	qes.Nil(items[1].PT)
 }
 

exec/scanner.go

@@ -198,14 +198,8 @@ func (s *scanner) ScanStruct(i interface{}) error {
 	record := map[string]interface{}{}
 	for index, col := range s.columns {
 		if pi, ok := scans[index].(*interface{}); ok {
-			v := *pi
+			raw := toJSONRawMessage(*pi)
-			if t, isTime := v.(time.Time); isTime {
-				// time.Time 直接存储，避免格式化字符串丢失纳秒和时区
-				record[col] = t
-			} else {
-				raw := toJSONRawMessage(v)
 			record[col] = &raw
-			}
 		} else {
 			record[col] = scans[index]
 		}