How to dump SQLite in-memory database into file wi

2020-02-28 23:53发布

I am using System.Data.SQLite.dll to make use of the SQLite in-memory database. After the program finishes, I would like to dump the in-memory database into a .db3 file for next use. How can I achieve this in C#?

1条回答
你好瞎i
2楼-- · 2020-02-29 00:09

To the best of my knowledge there is not built-in functionality to accomplish this in System.Data.SQLite.dll. The functionality does however exist in the sqlite3.exe client maintained along with the SQLite core.

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

  1. Obtain SQL statements to create new database structure.

    select sql from sqlite_master where name not like 'sqlite_%';
    
  2. Obtain names of all user tables.

    select name 
    from sqlite_master 
    where type='table' and name not like 'sqlite_%';
    
  3. Create the on-disk database in some new SQLiteConnection.

  4. Execute all previously obtained SQL statements to create the database structure in the on-disk database.

  5. Close the separate connection to the on-disk database.

  6. Attach the on-disk database to the in-memory database.

    attach 'ondisk.db3' as 'ondisk';
    
  7. For each user table obtained earlier, copy the content from the in-memory to the on-disk database.

    insert into ondisk.TableX select * from main.TableX;
    insert into ondisk.TableY select * from main.TableY;
    
查看更多
登录 后发表回答