![]() In SQLite source code we can see a function named tabIsReadOnly with this comment: /* Return true if table pTab is read-only. ![]() So I think our friend user143482 is trying to acesse a "read only" table. To fix the SQLite error attempt to write a readonly database during insert, you can change the permissions on the database file. So, it's seems hard to belive this can be a "chmod" problem, because if the file is read only, even creating table would be impossible as SQLite would be unable to write the "sqlite_master" data. In this db file we have of course the user tables but also the system tables so "sqlite_master" for example which contain the definiton of the tables. There is a plugin to compress and encrypt the database. So I edited the permissions on the file, so that the Apache process had write permissions. ![]() When I look at the data on the flash of the ESP I notice there is only one file for the whole db (there is also a temp file). 14 Answers Sorted by: 131 There can be several reasons for this error message: Several processes have the database open at the same time ( see the FAQ ). attempt to write a readonly database Which made sense. my database file is at assets/Restaurantdb.sql One more strange discovery is that I uninstall the whole thing and change some food name in my 'FOOD'table (like Burger to Burger1), it show Burger instead of Burger1. I was trying to insert an entry when customer order food into table 'Bill' but failed. I'm using SQLite on ESP32 and all answers here are "very strange". The database can only read but not write. It worked apparently there just needed to be enough time for the resources to flush out to disk. If the create/drop failed, we waited for 50 ms and tried again, repeating until we succeeded or 5 seconds elapsed. Hi I have a sqlite3 database which is working from one of the programs but when i try to write to it from another program i get the following error message. We got around this by running a test write query against the db upon opening (e.g., creating then dropping a table with a silly name). We speculated that the problem was due to the fact that Windows (or the sqlite implementation under windows) doesn't always immediately clean up up file resources upon closing of a file. I found this information in a comment at the very bottom of the PDO SQLite. We eventually discovered that the threads that were failing were only those that were trying to open the database immediately after another thread had closed it (within 3 ms). The problem, as it turns out, is that the PDO SQLite driver requires that if you are going to do a write operation ( INSERT, UPDATE, DELETE, DROP, etc), then the folder the database resides in must have write permissions, as well as the actual database file. Our system was suffering this problem, and it definitely wasn't a permissions issue, since the program itself would be able to open the database as writable from many threads most of the time, but occasionally (only on Windows, not on OSX), a thread would get these errors even though all the other threads in the program were having no difficulties. ![]()
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