diff --git a/26-data/data/database.go b/26-data/data/database.go
index 9e7a0bd..02fae5f 100644
--- a/26-data/data/database.go
+++ b/26-data/data/database.go
@@ -41,28 +41,28 @@ func scanIntoStruct(rows *sql.Rows, target interface{}) (results interface{}, er
 	colNames, _ := rows.Columns()
 	colTypes, _ := rows.ColumnTypes()
 	references := []interface{}{}
-	fieldVal := reflect.Value{}
 	var placeholder interface{}
 
 	for i, colName := range colNames {
 		Printfln("Column: %s", colName)
-		// 获取字段值
+		// 获取字段
 		colNameParts := strings.Split(colName, ".")
-		fieldVal = targetVal.FieldByName(colNameParts[0])
-		if fieldVal.IsValid() && fieldVal.Kind() == reflect.Struct && len(colNameParts) > 1 {
+		field := targetVal.FieldByName(colNameParts[0])
+		if field.IsValid() && field.Kind() == reflect.Struct && len(colNameParts) > 1 {
 			for _, namePart := range colNameParts[1:] {
 				comFunction := matchColName(namePart)
-				fieldVal = fieldVal.FieldByNameFunc(comFunction)
+				field = field.FieldByNameFunc(comFunction)
 			}
 		}
-		// 判断是否可以转换
-		if !fieldVal.IsValid() || !colTypes[i].ScanType().ConvertibleTo(fieldVal.Type()) {
+		if !field.IsValid() || !colTypes[i].ScanType().ConvertibleTo(field.Type()) {
+			// 字段不存在或者不可以转换
 			Printfln("Column placeholder: %s", colName)
 			references = append(references, &placeholder)
-		} else if fieldVal.Kind() != reflect.Ptr && fieldVal.CanAddr() {
+		} else if field.Kind() != reflect.Ptr && field.CanAddr() {
+			// 字段存在并且可以转换，不为指针并且可以获取到地址
 			Printfln("Column Addr: %s", colName)
-			fieldVal = fieldVal.Addr()
-			references = append(references, fieldVal.Interface())
+			field = field.Addr()
+			references = append(references, field.Interface())
 		}
 	}
 
@@ -73,6 +73,7 @@ func scanIntoStruct(rows *sql.Rows, target interface{}) (results interface{}, er
 		if err != nil {
 			break
 		}
+		// 将指针转换为结构体，从而可以复制该结构体，并增加到切片中
 		resultSlice = reflect.Append(resultSlice, targetVal)
 	}
 	results = resultSlice.Interface()