Question

我正在创建一个REST API。我正在使用Python，Flask和MySQL从数据库中获取数据并以JSON格式呈现它们。但我有一个问题。

REST API与NGINX和uWSGI一起提供，一切运行良好。索引页面保持可用，并且不会超时但是与数据库建立连接的页面会起作用。页面大约需要15分钟才能无响应。在phpmyadmin或navicat等RDBMS中不会发生此问题。

它可能是什么，我该如何解决？下面的REST API代码。

# using python version 2.7.10
from flask import Flask, jsonify, request, session
import mysql.connector.pooling

#Make a connection with the DB

dbconfig = {
  "host" : "12.34.5.78",
  "database": "db",
  "user":     "user",
  "password": "pass"
}

conn = mysql.connector.connect(pool_name = "mypool",
                          pool_size = 6,
                          **dbconfig)

#Define the root
app = Flask(__name__)

#Landings page
@app.route('/')
def index():
    return "Hello World."

# return all resources by name
@app.route('/resources', methods=['GET'])
def allResourceNames():
    conn1 = mysql.connector.connect(pool_name="mypool")
    reader = conn1.cursor()
    query = ("SELECT name FROM resources")
    reader.execute(query)
    resources = []
    for name in reader:
        resources.append({'name' : name[0]})
    reader.close()
    conn1.close()
    return jsonify({"resources" : resources})

if __name__ == "__main__":
    app.run(debug=True)

Answer 1

以上所有评论都是正确的。以下是在每次请求后修改代码以关闭数据库连接的方法。每次调用get_db并在每次请求后关闭它都会创建一个新的数据库连接。

# using python version 2.7.10
import mysql
from flask import Flask, jsonify, request, session, g

def connect_db():
    conn = mysql.connector.connect(user='user', password='pass',
                                   host='12.34.5.67', database='db')
    return conn

def get_db():
    if not hasattr(g, 'db'):
        g.db = connect_db()
    return g.db

#Define the root
app = Flask(__name__)


# close db at end of each request
@app.teardown_appcontext
def close_db(_):
    if hasattr(g, 'db'):
        g.db.close()


#Landings page
@app.route('/')
def index():
    return "Hello World."

# return all resources by name
@app.route('/resources', methods=['GET'])
def allResourceNames():
    reader = get_db()
    query = ("SELECT name FROM resources")
    reader.execute(query)
    resources = []
    for name in reader:
        resources.append({'name' : name[0]})
    return jsonify({"resources" : resources})

if __name__ == "__main__":
    app.run(debug=True)

Link to docs

带有烧瓶和MySQL的Python在一段时间不活动后超时

1 个答案: