Python编程在flask中模拟进行Restful的CRUD操作

2020-02-16 00:22:40

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这篇文章中我们将通过对HelloWorld的message进行操作，介绍一下如何使用flask进行Restful的CRUD。

概要信息

事前准备：flask

liumiaocn:flask liumiao$ which flask/usr/local/bin/flaskliumiaocn:flask liumiao$ flask --versionFlask 1.0.2Python 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/pythonfrom flask import Flaskfrom flask import render_templateapp = 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.html <!DOCTYPE html><html><head> <meta charset="utf-8"> <title>Hello Restful</title></head><body>    {% for message in messages %} <h1>{{ message }}</h1>    {% endfor %}</body></html>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/pythonfrom flask import Flaskfrom flask import render_templatefrom flask import requestimport jsonapp = 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/<messageid>",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/<messageid>",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$

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