5/11/2023 0 Comments Db file viewer![]() The b-tree pages hold the main database content. The smallest SQLite_3 database is a single 512-byte page.Įvery page in an SQLite_3 database file is of a particular type: The theoretical maximum size for an SQLite_3 database file is about 140 terabytes typically, the file size limit of the underlying filesystem or hardware is the practical constraint. The page size for a database file is indicated by the 2-byte integer located at an offset of 16 bytes from the beginning of the database file. The size of a page in bytes is a power of two between 56 inclusive. All pages within the same database are the same size. The main SQLite_3 database file consists of one or more pages. See Appropriate Uses For SQLite for more detail on when SQLite is appropriate and examples of when a client/server SQL database engine would be more appropriate. They are designed to implement a shared repository of enterprise data SQLite is designed to provide local data storage for individual applications. SQLite is not directly comparable to client/server SQL database engines such as MySQL, Oracle, PostgreSQL, or SQL Server. See Adoption under Sustainability Factors below for examples of the many operating systems and software applications in which it is distributed or used. These features make SQLite_3 a popular choice as an application file format. The database file format, referred to here as "SQLite_3", is cross-platform, transferable between 32-bit and 64-bit systems or between big-endian and little-endian architectures. The engine, and thus the file format, support a full-featured SQL implementation. A complete SQL database with tables, indexes, triggers, and views, is contained in a single disk file. SQLite is an embedded SQL database engine that requires no configuration and reads and writes directly to ordinary disk files. The code, software, and accompanying documentation have been dedicated to the public domain. Software and associated documentation are available at. This book is licensed under the Creative Commons Attribution-ShareAlike 4.0 International license.SQLite, version 3, is the file format used as the publicly documented native format for the SQLite database engine since June 2004. If your app’s data has -shm and/or -wal files, and you used “Close Database” to get a clean single-file copy of your database, in addition to copying that database to your device, you will need to remove the device’s -shm and -wal files to match.Be sure to terminate your app’s process before you do this, so you do not replace SQLite files behind Room’s back.If you wish, you could then copy the database back to the device, using Device File Explorer. When you are done, if you click the “Close Database” button, the SQLite database will be closed cleanly, leaving you with just the database file and without any -shm or -wal file. Note, though, that if you modify the data and wish to persist those changes, you need to click the “Write Changes” toolbar button. For queries or other statements that return results, you get a table showing those results: The “Execute SQL” tab lets you enter in your own queries or other operations (e.g., INSERT statements) and run them against your database. The “Browse Data” tab gives you a tabular view of the contents of a selected table, chosen via the drop-down in the tab’s own toolbar:ĭB Browser for SQLite, Showing Table Contents Like Database Inspector, DB Browser for SQLite gives you a tree of the various tables in the “Database Structure” tab, where you can see the schema for a table:ĭB Browser for SQLite, Showing Table Schema You can then open it in DB Browser for SQLite using the “Open Database” toolbar button, selecting the database file itself (not the -shm or -wal files, if any). You will need to copy all of these files to your development machine, most likely using Device File Explorer from Android Studio. Particularly if the app opened the database and did not explicitly close it, you will also see two additional files, with the same name as the database plus -shm and -wal extensions. In there, you will find a database file, with the name that you gave it in your RoomDatabase (e.g., stuff.db).
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