在 Flask 中，什么是“request.args"?它是如何使用的? [英] In Flask, what is "request.args" and how is it used?

问题描述

作为 Flask 初学者，我无法理解 request.args 是如何使用的.我在某处读到它用于返回查询字符串的值(如果我错了，请纠正我)以及 request.args.get() 需要多少个参数.

As a Flask beginner, I can't understand how request.args is used. I read somewhere that it is used to return values of query string (correct me if I'm wrong) and how many parameters request.args.get() takes.

我知道当我必须存储提交的表单数据时，我可以使用 fname = request.form.get("firstname").这里只传递了一个参数，而下面的代码需要两个参数.

I know that when I have to store submitted form data, I can use fname = request.form.get("firstname"). Here, only one parameter is passed, whereas the code below takes two parameters.

@app.route("/")
def home():
    cnx = db_connect()
    cur = cnx.cursor()
    output = []

    page = request.args.get('page', 1)

    try:
        page = int(page)
        skip = (page-1)*4
    except:
        abort(404)
   
    stmt_select = "select * from posts limit %s, 4;"
    values=[skip]

    cur.execute(stmt_select,values)
    x=cur.fetchall()

    for row in reversed(x):
        data = {
           "uid":row[0],
           "pid":row[1],
           "subject":row[2],
           "post_content":row[3],
           "date":datetime.fromtimestamp(row[4]),
        }
        output.append(data)
    
    next = page + 1
    previous = page-1
    if previous<1:
    previous=1
    return render_template("home.html", persons=output, next=next, previous=previous)

请解释为什么它需要两个参数，然后它的用途是什么.

Please explain why it takes two parameters, and then what its use is.

推荐答案

根据 flask.Request.args 文档.

According to the flask.Request.args documents.

flask.Request.args
带有查询字符串解析内容的 MultiDict.(网址中问号后的部分).

flask.Request.args
A MultiDict with the parsed contents of the query string. (The part in the URL after the question mark).

所以 args.get() 是 MultiDict，其原型如下:

So the args.get() is method get() for MultiDict, whose prototype is as follows:

get(key, default=None, type=None)

---

在较新版本的烧瓶中(v1.0.x 和 v1.1.x), flask.Request.args 是一个 ImmutableMultiDict(一个不可变的MultiDict)，所以上面的原型和具体方法仍然有效.

---

In newer version of flask (v1.0.x and v1.1.x), flask.Request.args is an ImmutableMultiDict(an immutable MultiDict), so the prototype and specific method above are still valid.

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