Question

典型的圣杯应用程序定义了多个路由，但是如何将其正确连接到RDS以便我可以保存POST数据或从数据库中检索数据？我已经通过RDS面板创建了一个数据库;我只是不确定如何从Chalice访问它。

是否只是让每条路由都通过user / pass连接到给定的RDS主机？

例如，

from chalice import Chalice
import psycopg2

app = Chalice(app_name='test')
db_user = 'test'
db_pass = 'password'
db_host = 'https://.....'
db_port = 5432

@app.route('/save_data')
def save_data():
    with psycopg2.connect(user=db_user, password=db_pass, ...) as conn:
        with conn.cursor() as cur:
            cur.execute("INSERT INTO test (num, data) VALUES (%s, %s)", (1,2))

@app.route('/get_data')
def get_data():
    with psycopg2.connect(user=db_user, password=db_pass, ...) as conn:
        with conn.cursor() as cur:    
            cur.execute("SELECT * FROM test")


@app.route('/something')
def something():
    with psycopg2.connect(user=db_user, password=db_pass, ...) as conn:
        with conn.cursor() as cur:    
            cur.execute(....)  # some other query

如果是这样，是否有更简单的方法来处理它，而不是每次都必须指定数据库连接？是否存在与此相关的奇怪会话/竞赛条件？

或者，如果我完全关闭，从Chalice路线连接到RDS的正确方法是什么？

Answer 1

我实际上已经在我的Chalice应用程序中设置了这个。我所做的是设置参数存储并在那里存储我不同的数据库连接并将它们调用到Chalice中。

我创建了一个名为Parameters.py的文件并将其放入其中：

import boto3

def getParameter(param_name):
    # Create the SSM Client
    ssm = boto3.client('ssm', region_name='us-east-1')

    # Get the requested parameter
    response = ssm.get_parameters(
        Names=[
            param_name,
        ],
        WithDecryption=True
    )

    # Store the credentials in a variable
    credentials = response['Parameters'][0]['Value']

    return credentials

然后我可以这样称呼它：

def dbInsert(query, stage):
    stageParm = stage + "_database"
    parm = Parameters.getParameter(stageParm)
    pJson = json.loads(parm)
    repli = pJson["replication"]
    dbName = pJson["database"]
    writeEndPoint = repli["write"]["host"]
    writeUsername = repli["write"]["username"]
    writePassword = repli["write"]["password"]
    try:
        conn = pymysql.connect(
                writeEndPoint,
                user=writeUsername,
                passwd=writePassword,
                db=dbName,
                connect_timeout=5)
    except Exception as ex:
        return ex
    cur = conn.cursor()
    cur.execute(query)
    results = cur.fetchall()
    cur.close()
    conn.close()
    return results
    results = cur.fetchall()
    cur.close()
    conn.close()
    return results

希望它有所帮助。

通过Chalice连接到AWS RDS的不同路由？

1 个答案: