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...the dynamic typing in SQLite allows it to do things which are not possible in traditional rigidly typed databases.
First, by default, multiple processes can have the same SQLite database open at the same time, and several read accesses can be satisfied in parallel. In case of writing, a single write to the database locks the database for a short time, nothing, even reading, can access the database file at all.
FTS5 is an SQLite virtual table module that provides full-text search functionality to database applications. In their most elementary form, full-text search engines allow the user to efficiently search a large collection of documents for the subset that contain one or more instances of a search term.
Summary. Use the ALTER TABLE statement to modify the structure of an existing table. Use ALTER TABLE table_name RENAME TO new_name statement to rename a table. Use ALTER TABLE table_name ADD COLUMN column_definition statement to add a column to a table.
There can be several reasons for this error message:
Several processes have the database open at the same time (see the FAQ).
There is a plugin to compress and encrypt the database. It doesn't allow to modify the DB.
Lastly, another FAQ says: "Make sure that the directory containing the database file is also writable to the user executing the CGI script." I think this is because the engine needs to create more files in the directory.
The whole filesystem might be read only, for example after a crash.
On Unix systems, another process can replace the whole file.
I solved this by changing owner from root to me on all files on /db dir.
Just do ls -l on that folder, if any of the filer is owned by root just change it to you, using: sudo chown user file
(this error message is typically misleading, and is usually a general permissions error)
On Windows
This error usually happens when your database is accessed by one application already, and you're trying to access it with another application.
If using Android.
Make sure you have added the permission to write to your EXTERNAL_STORAGE to your AndroidManifest.xml.
Add this line to your AndroidManifest.xml file above and outside your <application> tag.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
This will allow your application to write to the sdcard. This will help if your EXTERNAL_STORAGE is where you have stored your database on the device.
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