![]() ![]() Reading up a bit online I found documentation that usually enabling WAL should make the problem go away (it's already enabled) or that multithreading could cause it, which I thought unlikely, since that's sort of what a connection pool is for.Īnyhow, I wrapped the Pool in a Mutex and tried using that and the error still occured. SQLite Version 3.0. Read locks will then not be released until a commit or rollback. I had hoped that the pool feature would just make my multithreading worries go away, but sadly I still got error 262 database table is locked. To use the normal SQLite locking behavior, you can use the connector option locktype cautious. The DB layout is basically just one table cache with key TEXT, data BLOB and I just use normal SELECT data from CACHE where key = ? prepared statements to retrieve and normal inserts to put the data into the DB. Use PRAGMA busytimeout to wait some time for the other transaction to finish: conn.execute ('PRAGMA busytimeout 30000') 30 s. What I did to fix the problem was to put the commands to read/write the repository (SQLite DB) inside a Service class. 'Database is locked' means that some other connection has an active connection. If the data isn't in the database, we recompute it and store it in the DB before sending it out. I had the exact same issue here, SQLite DB locking everytime when trying multiple read/writes from multiple threads. The biggest difference between the two return values: SQLITELOCKED: if you get this from a sqlite3step statement, you MUST call sqlite3reset on the statement handle. Im using provider in an ASP.NET application (framework 4.0). SQLITEBUSY usually means that sqlite needs to acquire the lock. When this data is requested, the worker thread first queries the database before computing, to see if the result already has been computed, to save time. Your sqlite3step, sqlite3prepare and some other calls may return SQLITEBUSY or SQLITELOCKED. If you do a BEGIN EXCLUSIVE statement, it will acquire an exclusive lock before doing operations in that transaction. ![]() Several worker threads compute data, which can take a long time to produce and then store it into a table. If you dont use a transaction, then transactions are implicit, so if you start a INSERT/DELETE/UPDATE, sqlite will try to acquire an exclusive lock, and complete the operation before releasing it. If you have any problems with the registration process or your account login, please contact us.I'm trying to use sqlx with an SqlitePool as a caching backend for an actix web application. When I simulate this query by using the python interactive interpreter, I am able to insert the single value to DB properly. Registration is fast, simple and absolutely free so please, join our community today! I'm trying to insert all values of a list to my sqlite3 database. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. If you are looking for information about Qt related issue - register and post your question. ![]() Over 90 percent of questions asked here gets answered. Which is just the behaviour you are seeing. Once one application connects to the database, which means just acquiring a write lock on it, no other applications can access it for writes, but can access it for reads. Qt Centre is a community site devoted to programming in C++ using the Qt framework. Sqlite generally accepts a single 'connection'. Select the forum that you want to visit from the selection below. Before you can post: click the register link above to proceed. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |