1、下载必要插件

pip install flask-restful

　　flask-restful与Django的restful模块类似，但是操作要简单许多

2、加载模块

main.py

3、使用视图类定义API

views.py

form main import apifrom flask import jsonify
from models import *
from flask_restful import Resource


@api.resource("/api/books/")
class BookApi(Resource):
    def __init__(self):
        super(BookApi, self).__init__()
        self.result = {
            "Code": 200,
            "Version": "1.0",
        }

    def set_data(self, books):
        result_data = {
            "id": books.id,
            "title": books.title,
            "detail_description": books.detail_description,
            "picture": books.picture,
            "author": books.author,
            "publish_time": books.publish_time,
            "price": books.price,
            "type": Types.query.get(books.type_id).type
        }
        return result_data

    def get(self):
        """
        从数据库中获取数据
        :return: 返回获取到的数据，200：获取成功，400：获取失败
        """
        self.result["Method"] = "get"
        columns = ["start_page", "limit"]
        data = request.args
        if data:
            limit = int(data.get("limit", 10))
            start_page = (int(data.get("start_page", 1)) - 1 if (int(data.get("start_page", 1)) > 0) else 0) * limit
            id_list = Books.query.with_entities(Books.id).all()[start_page:start_page + limit]
            page_range = [i[0] for i in id_list]
            books = Books.query.filter(Books.id.in_(page_range)).all()
            book_list = []
            for book in books:
                book_list.append(self.set_data(book))
            self.result["Data"] = book_list
        else:
            books = Books.query.with_entities(Books.id).all()
            total = len(books)
            self.result["Code"] = 400
            self.result["Total"] = total
            self.result["Columns"] = columns
        return jsonify(self.result)

    def post(self):
        """
        这里是post请求，负责保存数据
        :return: 返回数据保存的状态，200：保存成功，400：保存失败
        """
        self.result["Method"] = "post"
        columns = sorted(["title", "detail_description", "picture", "author", "publish_time", "price", "type"])
        data = request.form
        columns_post = [i for i in data]
        columns_post.sort()
        if data:
            if columns != columns_post:
                self.result["Code"] = 400　　　　　　　　　　self.result["Columns"] = columns
            else:　　　　　　　　　　self.result["Code"] = 200
                session = models.session()
                session.add(Books(
                    author=data.get("author"),
                    detail_description=data.get("detail_description"),
                    picture=data.get("picture"),
                    price=data.get("price"),
                    publish_time=data.get("publish_time"),
                    title=data.get("title"),
                    type_id=Types.query.filter_by(type=data.get("type")).first().id,
                ))
                session.commit()
        else:
            self.result["Code"] = 400
            self.result["Columns"] = columns
        return jsonify(self.result)

    def put(self):
        """
        负责修改数据
        :return:返回修改的状态，200：修改成功，400：修改失败
        """
        self.result["Method"] = "put"
        data = request.form
        columns = sorted(["id", "title", "detail_description", "picture", "author", "publish_time", "price", "type"])
        columns_put = [i for i in data]
        if "id" in columns_put and set(columns) >= set(columns_put):
            self.result["Code"] = 200
            id = int(data.get("id"))
            book = Books.query.get(id)
            for key, value in data.items():
                if key not in ["id", "type"]:
                    setattr(book, key, value)
            book.type_id = int(data.get("type", book.type_id))
            book.save()
        else:
            self.result["Code"] = 400
            self.result["Columns"] = columns
        return jsonify(self.result)

    def delete(self):
        """
        负责删除数据
        :return: 返回删除的状态，200：删除成功，400：删除失败
        """
        data = request.form
        self.result["Method"] = "delete"
        if data:
            self.result["Code"] = 200
            id = int(data.get("id"))
            book = Books.query.get(id)
            book.delete()
        else:
            self.result["Code"] = 400
            self.result["Columns"] = ["id"]
        return jsonify(self.result)

　　这里为一个数据表建立API，数据表含有的字段如下：