If you search on the Sqlite Documentation, they recomend open the connection once and never close it.
![sqlite database locked sqlite database locked](http://www.p6academy.com/wp-content/uploads/2018/03/6-1024x650.png)
If I'm wrong with something or someone want to add something, I'm going to glad to reed it. This way, we are going to reuse the connection and SQLite handle everything.Īnd as I said above, never close the connection. Public static SQLiteConnection GetConnection()Ĭonn = DependencyService.Get().GetConn() Var conn = new SQLite.SQLiteConnection(path, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create | SQLiteOpenFlags.FullMutex, true) Ĭreate only one connection with the DB and never close it (Shared project).
#SQLITE DATABASE LOCKED ANDROID#
Using "SQLiteOpenFlags.FullMutex, true" in Android project (It seens with this we avoid the SIGSEGV crashes). I was searching for a while and I did finish thinking that this maybe is the best approach to work with local database and concurrency (without use BeginTransaction, Commit, Close and Dispose). This means you cant have the DB file on a smb or any type of network share. you can get really good concurrency this way, the only gotcha is all processes that access your DB have to be on the same device. So I need your help guys to solve the problem (database locked) and review if my implementation with the SQLite is OK.ĭid this solution work for you? I am going through the same problem. To avoid locked databases enable WAL mode on your SQLite database. Var conn = new SQLite.SQLiteConnection(path, SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create | SQLiteOpenFlags.SharedCache) Var path = Path.Combine(documentsPath, sqliteFileName) Var sqliteFileName = "FN_Desarrollo.db3" Public SQLite.SQLiteConnection GetConnection() public class Configuracion : IConfiguracion "Un error a ocurrido con la DB (Actualizar): " + (), "Un error a ocurrido con la DB (Insert): " + (), Use locks to avoid database collisionsĪ( Private static object collisionLock = new object() Ĭnn = DependencyService.Get().GetConnection() Īll methods have the collisionLock (to avoid conflict with database) and cnn.Dispose() (To close connection with the database and avoid the error Fatal signal 11 (SIGSEGV)) ĭataContext.cs public interface IBusinessEntity In DataContext.cs we have the connection with the local database and all the methods with the local database. I recommend wrapping your SQLite database access in a class that has flags to denote that: A) You’ve established a connection to the database B) You’ve commenced a transaction that has yet to be commited or rolled back Then in the destructor you can check whether you have a pending transaction to rollback and a connection to close. I use a class DataService.cs where that class connect with the DataContext.cs and make the connection with database and methods CRUD.Īll methods in the DataService have the same way to connect with DataContext //This is a resume of DataService.cs
![sqlite database locked sqlite database locked](https://1.bp.blogspot.com/-VfJ1e6qxZ_A/V9JlOGsj16I/AAAAAAAAGPM/yFIAb3pbJWU4ZgDgD-eVMXll5VPnA95HQCLcB/s1600/sqliteinmem01.png)
So I need help to solve this, I know that there are a lot of post about this problem, but base on my implamentation with my database, it seems not to be enough to solve my problem. Sometimes when the app is sync up with the API, I'm getting the error "database is LOCKED", when I'm making another operation on the App.
![sqlite database locked sqlite database locked](https://joshmoulin.com/wp-content/uploads/2015/05/Mozilla-11.png)
Using (var dbContext = 'm working on a App that have more than 50 tables and can work without internet connection, so in background the app can sync up with the API and get all the information and make the CRUD operation in local. So everything pointed to it being a mistake I had made.Īnd it was, it turns out the issue was I had the dbContext.SaveChanges() call inside a foreach loop This error often occurs when a server or its file system are under substantial load & the database is not able to serve requests to keep up with. To dump a database containing a Wagtail app, further exclusions should be considered or.
![sqlite database locked sqlite database locked](http://www.p6academy.com/wp-content/uploads/2018/03/6.png)
I have read plenty of documentation and even tried swapping to use SQL Server, as opposed to SQLite, but this just resulted in the error ‘There is already an open DataReader associated with this Connection which must be closed first.’. SQLite database is integrated with the application that accesses the database. so in action app instance 1 will work with John's data and app instance 2. each thread is configured independently so it will not change the data that written with other instances. Before the server and version migration we used it for. I made a application in python and it should read and write simultaneously in multiple instances (multi CMD widows) (multi-threading). I have spent too long today trying to track down an intermittent “SQLite Error 5: ‘database is locked’” error in. ActiveRecord::StatementInvalid (SQLite3::BusyException: database is locked: commit transaction).