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Python / SQLite - database locked despite large timeouts


Python / SQLite - database locked despite large timeouts

By : user3863151
Date : January 02 2021, 06:48 AM
I hope this helps . In early versions of pysqlite, the timeout parameter to sqlite.connect is apparently interpreted as milliseconds. So your timeout=30.0 should be timeout=30000.
code :


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Python SQLite: database is locked

Python SQLite: database is locked


By : Usman Gondal
Date : March 29 2020, 07:55 AM
around this issue Turned out the problem happened because the path to the db file was actually a samba mounted dir. I moved it and that started working.
Python script is locked when accessing SQLite database in loop

Python script is locked when accessing SQLite database in loop


By : Nelly
Date : March 29 2020, 07:55 AM
it helps some times Replace cur.executemany(sql_add, match) with cur.execute(sql_add, match). executemany() is used for performing the same operation multiple times over an iterable of values. For example, if you had this:
code :
match = [ (season1, tour1, date1, home1, visitor1, home_score1, visitor_score1),
          (season2, tour2, date2, home2, visitor2, home_score2, visitor_score2),
          (season3, tour3, date3, home3, visitor3, home_score3, visitor_score3) ]

cur.executemany(sql_add, match)
Hibernate SQlite mapping class with iner classes exception The database file is locked (database is locked)

Hibernate SQlite mapping class with iner classes exception The database file is locked (database is locked)


By : anjali unnikrishnan
Date : March 29 2020, 07:55 AM
this one helps. Problem: The auto generation of user.id - it mutually locks/concurs with the insert statement. Problem: After the lock is fixed, we run into NPE's in the output loop
Solution:
code :
Main.java://or somewhere else
...
user.setId(userId);
...


User.java:
...
@Id
//!@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
...
User.java:
...
public void setmData(UserEntity mData) {
    this.mData = mData;
    if(mData == null) {
      this.id = null;
    } else {
      this.id = mData.getmId();
    }
}

@Id
//!@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
...
public static <T extends Object> void saveEntityDb(T... entityList) {
  //local variable!
  final Session session = Hibernate.getSessionFactory().openSession();
  Transaction tx = null;
  try {
    if (session.isConnected()) {
      tx = session.beginTransaction();
      for (T entity : entityList) {
        session.saveOrUpdate(entity);
      }
      session.flush();
      tx.commit();
    }
  } catch (HibernateException ex) {
    if (tx != null && tx.getStatus().canRollback()) {
      tx.rollback();
    }
  } finally {
    if (session != null) {
      session.close();
    }
  }
}
Main.java:
...
User user = new User();
user.setmData(userEntity);
//do this before...
DAO.saveEntityDb(user);

List<MainEntityModel> mainEntityModelList = ...
//...you do this
DAO.saveEntityDb(mainEntityModelList.toArray(new MainEntityModel[0]));
Why is sqlite db database locked when there's no other python process writing to it at the same time?

Why is sqlite db database locked when there's no other python process writing to it at the same time?


By : user3549798
Date : March 29 2020, 07:55 AM
wish help you to fix your issue From the docs: The sqlite3 module opens transactions implicitly before a Data Modification Language (DML) statement (i.e. INSERT/UPDATE/DELETE/REPLACE), and commits transactions implicitly before a non-DML, non-query statement (i. e. anything other than SELECT or the aforementioned).
In my case, I only had a UPDATE, which means a BEGIN was inserted by sqlite3 before that, followed but the signal.pause(), which means I hadn't encountered a non DML stmt, and the transaction was still active right before sleeping
Sqlite python sqlite3.OperationalError: database is locked

Sqlite python sqlite3.OperationalError: database is locked


By : JJ Abuedo
Date : March 29 2020, 07:55 AM
wish helps you I'm not sure if this will help anyone, but I figured out a solution to my own Locked Database problem.
I use PyCharm and found that several instances of the script I was working on were all running. This was usually due to errors in the code I was testing, but it stayed active (and therefore the connection to the db was still active). Close out of those (stop all the processes) and try again - it has worked every time for me!
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