Question

我有一个运行在Azure应用服务提供的Azure上的Flask服务器，其中sqlite3作为数据库。我无法更新sqlite3，因为它显示数据库已锁定

    2018-11-09T13:21:53.854367947Z [2018-11-09 13:21:53,835] ERROR in app: Exception on /borrow [POST]
    2018-11-09T13:21:53.854407246Z Traceback (most recent call last):
    2018-11-09T13:21:53.854413046Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    2018-11-09T13:21:53.854417846Z     response = self.full_dispatch_request()
    2018-11-09T13:21:53.854422246Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    2018-11-09T13:21:53.854427146Z     rv = self.handle_user_exception(e)
    2018-11-09T13:21:53.854431646Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    2018-11-09T13:21:53.854436146Z     reraise(exc_type, exc_value, tb)
    2018-11-09T13:21:53.854440346Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    2018-11-09T13:21:53.854444746Z     raise value
    2018-11-09T13:21:53.854448846Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    2018-11-09T13:21:53.854453246Z     rv = self.dispatch_request()
    2018-11-09T13:21:53.854457546Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    2018-11-09T13:21:53.854461846Z     return self.view_functions[rule.endpoint](**req.view_args)
    2018-11-09T13:21:53.854466046Z   File "/home/site/wwwroot/application.py", line 282, in borrow
    2018-11-09T13:21:53.854480146Z     cursor.execute("UPDATE books SET stock = stock - 1 WHERE bookid = ?",(bookid,))
    2018-11-09T13:21:53.854963942Z sqlite3.OperationalError: database is locked

这是路线-

@app.route('/borrow',methods=["POST"])
def borrow():
    # import pdb; pdb.set_trace()
    body = request.get_json()
    user_id = body["userid"]
    bookid = body["bookid"]
    conn = sqlite3.connect("database.db")
    cursor = conn.cursor()
    date = datetime.now()
    expiry_date = date + timedelta(days=30)
    cursor.execute("UPDATE books SET stock = stock - 1 WHERE bookid = ?",(bookid,))
    # conn.commit()
    cursor.execute("INSERT INTO borrowed (issuedate,returndate,memberid,bookid) VALUES (?,?,?,?)",("xxx","xxx",user_id,bookid,))
    conn.commit()
    cursor.close()
    conn.close()

    return json.dumps({"status":200,"conn":"working with datess update"})

我尝试使用编译指示检查数据库完整性。没有完整性损失。所以我不知道是什么原因导致该错误。感谢您的帮助：）

Answer 1

我在Linux上的Docker上使用Azure应用服务，并且存在相同的问题。如果您在Windows上使用Azure应用服务，则该问题与我的问题不同。

问题在于/ home作为CIFS文件系统挂载，无法处理SQLite3锁。

我的解决方法是将db.sqlite3文件复制到/ home以外的某个目录，并正确设置db.sqlite3文件及其目录的权限和所有权。然后，让我的项目读/写它。但是，此解决方法非常尴尬。我不推荐。

Answer 2

大概这个解决方案对于生产工作负载不安全，但至少我通过执行以下命令让它工作：

sqlite3 <database-file> 'PRAGMA journal_mode=wal;'

运行上述命令后，我存储在 Azure 文件共享上的数据库在容器 Web 应用程序中运行。

Answer 3

我通过使用以下配置设置天蓝色的安装选项来获得它：

dir_mode=0777,file_mode=0777,uid=0,gid=0,mfsymlinks,nobrl,cache=strict

但是真正的解决方案是添加标志 nobrl 。

添加kubernetes的storageclass示例：

---
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: azureclass
provisioner: kubernetes.io/azure-file
mountOptions:
  - dir_mode=0777
  - file_mode=0777
  - uid=0
  - gid=0
  - mfsymlinks
  - nobrl
  - cache=strict
parameters:
  skuName: Standard_LRS

SQLite3数据库在Azure中被锁定

3 个答案: