在Flask中，什么是request.args以及如何使用? [英] In Flask, What is request.args and how is it used?

问题描述

我是Flask的新手.我不明白如何使用request.args.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. 我知道当我必须存储提交的表单数据时，可以使用

I'm new in Flask. 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. I know that when I have to store submitted form data, I can use

fname = request.form.get("firstname")

这里，仅传递了一个参数.

Here, only one parameter is passed.

考虑此代码.分页也已在此代码中完成.

Consider this code. Pagination has also been done in this code.

@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)

在这里，request.args.get()具有两个参数.请解释为什么要使用两个参数以及它的用途.

Here, request.args.get() takes two parameters. Please explain why it takes two parameters and what is the use of it.

推荐答案

根据 flask.Request.args 文档.

flask.Request.args
MultiDict ，其中包含查询字符串的已解析内容. (URL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).

因此，args.get()是的方法get(). 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)

---

更新:
在更新版本的flask( v1.0.x 和 v1.1.x )， flask.Request.args 是

---

Update:
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 is still valid.

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