英文:
Golang using lowercase for first letter in Struct property
问题
我有一个关于Golang视图模板的问题，我目前在结构体属性中使用小写字母来构建结构体，然后将其作为映射传递给视图。
这是我的结构体示例：
type User struct {
uid int
username, departname string
}
然后我将结构体的集合传递给视图文件：
func (App *App) indexHander(w http.ResponseWriter, r *http.Request) {
rows, err := App.db.Query("SELECT * FROM userinfo")
checkErr(err)
t, _ := template.ParseFiles(App.folderpath + "/list.gtpl")
users := make([]User, 0) // 定义空的用户集合
for rows.Next() {
var uid int
var username string
var departname string
var created string
err = rows.Scan(&uid, &username, &departname, &created)
checkErr(err)
users = append(users, User{uid, username, departname})
}
t.Execute(w, users)
defer rows.Close()
}
以下是我的视图HTML代码：
<html>
<head>
<title></title>
</head>
<body>
<ul>
{{ range . }}
<li>{{ .username }}</li>
{{ end }}
</ul>
</body>
</html>
上述代码给我返回了空的用户数据。
但是，如果在结构体中使用首字母大写，就可以得到正确的结果：
结构体
type User struct {
Uid int
Username, Departname string
}
HTML
<html>
<head>
<title></title>
</head>
<body>
<ul>
{{ range . }}
<li>{{ .Username }}</li>
{{ end }}
</ul>
</body>
</html>
现在它可以正常工作。
有人可以解释一下这种行为吗？
英文:
I have an issue with Golang view template, I currently using lowercase in the struct properties to build the struct then passed it to the view as a map.
here is my Struct look like:
type User struct {
uid int
username, departname string
}
then I passed the collection of structs to the file view:
func (App *App) indexHander(w http.ResponseWriter, r *http.Request) {
rows, err := App.db.Query("SELECT * FROM userinfo")
checkErr(err)
t, _ := template.ParseFiles(App.folderpath + "/list.gtpl")
users := make([]User, 0) // define empty collection of users
for rows.Next() {
var uid int
var username string
var departname string
var created string
err = rows.Scan(&uid, &username, &departname, &created)
checkErr(err)
users = append(users, User{uid, username, departname})
}
t.Execute(w, users)
defer rows.Close()
}
and here is my view html code:
<html>
<head>
<title></title>
</head>
<body>
<ul>
{{ range . }}
<li>{{ .username }}</li>
{{ end }}
</ul>
</body>
</html>
Those code above gave me empty users data:
But however, using capitalize first letter in struct give me working result:
Struct
type User struct {
Uid int
Username, Departname string
}
html
<html>
<head>
<title></title>
</head>
<body>
<ul>
{{ range . }}
<li>{{ .Username }}</li>
{{ end }}
</ul>
</body>
</html>
it works now
Can somebody explain me this behavior ?
答案1
得分: 11
阅读文档这里
为了允许从另一个包中访问标识符，可以将其导出。如果满足以下两个条件，则标识符被导出：
- 标识符名称的第一个字符是一个 Unicode 大写字母（Unicode 类别 "Lu"）；
- 标识符在包块中声明，或者是字段名或方法名。
所有其他标识符都不会被导出。
英文:
read the doc here
An identifier may be exported to permit access to it from another package. An identifier is exported if both:
- the first character of the identifier's name is a Unicode upper case
letter (Unicode class "Lu"); - and the identifier is declared in thepackage block or it is a field
name or method name.
All other identifiers are not exported.
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