如何使用flask进行Restful的CRUD-创新互联
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当前标题:如何使用flask进行Restful的CRUD-创新互联
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这篇文章主要介绍如何使用flask进行Restful的CRUD,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
概要信息
事前准备:flask
liumiaocn:flask liumiao$ which flask /usr/local/bin/flask liumiaocn:flask liumiao$ flask --version Flask 1.0.2 Python 2.7.10 (default, Jul 15 2017, 17:16:57) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)] liumiaocn:flask liumiao$
代码示例:HTTP谓词(GET)
就像angular的插值表达式在模版中的作用一样,在flask中也可以一样使用,如果不熟悉angular的插值表达式的话也不要紧,看完下面的例子,基本上就会有一个大致的印象。
代码示例
liumiaocn:flask liumiao$ cat flask_4.py #!/usr/bin/python from flask import Flask from flask import render_template app = Flask(__name__) greeting_messages=["Hello World", "Hello Python"] @app.route("/api/messages",methods=['GET']) def get_messages(): return render_template("resttest.html",messages=greeting_messages) if __name__ == "__main__": app.debug=True app.run(host='0.0.0.0',port=7000) liumiaocn:flask liumiao$
模版文件
liumiaocn:flask liumiao$ cat templates/resttest.htmlHello Restful {% for message in messages %}{{ message }}
{% endfor %} liumiaocn:flask liumiao$
代码解析:app.route中指定了HTTP谓词GET,缺省GET可以省略,如果一个方法对应多个谓词动作,通过request.method来分离时,可以写成methods=[‘GET','POST']的形式
执行&确认
liumiaocn:flask liumiao$ ./flask_4.py * Serving Flask app "flask_4" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: on * Running on http://0.0.0.0:7000/ (Press CTRL+C to quit) * Restarting with stat * Debugger is active! * Debugger PIN: 131-533-062
页面确认
代码示例:HTTP谓词(DELETE|PUT|POST)
liumiaocn:flask liumiao$ cat flask_4.py #!/usr/bin/python from flask import Flask from flask import render_template from flask import request import json app = Flask(__name__) greeting_messages=["Hello World", "Hello Python"] #HTTP: GET: Retrieve operation @app.route("/api/messages",methods=['GET']) def get_messages(): return render_template("resttest.html",messages=greeting_messages) #HTTP: DELETE: Delete operation @app.route("/api/messages/",methods=['DELETE']) def delete_message(messageid): global greeting_messages del greeting_messages[int(messageid)] return render_template("resttest.html",messages=greeting_messages) #HTTP: PUT: Update operation #HTTP: POST: Create operation @app.route("/api/messages/ ",methods=['PUT','POST']) def update_message(messageid): global greeting_message msg_info=json.loads(request.get_data(True,True,False)) #msg_info=request.args.get('message_info') #msg_info=request.form.get('message_info','default value') #msg_info=request.values.get('message_info','hello...') greeting_messages.append("Hello " + msg_info["message_info"]) return render_template("resttest.html",messages=greeting_messages) if __name__ == "__main__": app.debug=True app.run(host='0.0.0.0',port=7000) liumiaocn:flask liumiao$
执行&结果确认
执行日志
liumiaocn:flask liumiao$ ./flask_4.py * Serving Flask app "flask_4" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: on * Running on http://0.0.0.0:7000/ (Press CTRL+C to quit) * Restarting with stat * Debugger is active! * Debugger PIN: 131-533-062
结果确认:Delete
liumiaocn:flask liumiao$ curl -X DELETE http://localhost:7000/api/messages/1Hello Restful Hello World
liumiaocn:flask liumiao$
可以看到执行一次DELETE之后,两条消息现在只剩下一条消息了,接下来使用POST添加再添加一条
liumiaocn:flask liumiao$ curl -X POST -d '{"message_info":"LiuMiaoPost"}' http://localhost:7000/api/messages/3Hello Restful Hello World
Hello LiuMiaoPost
liumiaocn:flask liumiao$
再执行一次PUT操作
liumiaocn:flask liumiao$ curl -X PUT -d '{"message_info":"LiuMiaoPut"}' http://localhost:7000/api/messages/4Hello Restful Hello World
Hello LiuMiaoPost
Hello LiuMiaoPut
liumiaocn:flask liumiao$
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当前标题:如何使用flask进行Restful的CRUD-创新互联
网站地址:http://azwzsj.com/article/cdgceh.html