How to dump SQLite database in memory to file using ADO.NET?

Question

I am using System.Data.SQLite.dll to use the SQLite database in memory. After completing the program, I want to dump the database in memory into a .db3 file for later use. How can I achieve this in C #?

Answer 1

As far as I know, there are no built-in functions for System.Data.SQLite.dll. However, functionality exists in the sqlite3.exe client, which is supported with the SQLite kernel.

Here is how I would do it with system.data.sqlite.dll:

• Get SQL statements to create a new database structure.

   select sql from sqlite_master where name not like 'sqlite_%'; 

• Get the names of all user tables.

   select name from sqlite_master where type='table' and name not like 'sqlite_%'; 

• Create a database on disk in some new SQLiteConnection.

• Executing all previously received SQL statements to create the database structure in the database on disk.

• Close the separate database connection on disk.

• Attach the database on disk to the database in memory.

   attach 'ondisk.db3' as 'ondisk'; 

• For each user table obtained earlier, copy the contents from memory to the database on disk.

   insert into ondisk.TableX select * from main.TableX; insert into ondisk.TableY select * from main.TableY;