问题
I am using a SQLite database file in my Android application that is created from several pieces stored in the assets folder by using the following approach: ReignDesign - Using your own SQLite database in Android applications
On completion of the assemby process I would like to check if the database was correctly merged. The following approaches crossed my mind:
- MD5 hash comparison
- Checking table existence and entry counts
Which approach would you recommend? Is there a better way?
Thanks,
Philipp
回答1:
I had a similar situation in an application I'm developing. There are a variety of ways of doing it; but in the end I stopped worrying about what exactly and how to best measure database integrity, and instead focused on 'is my database usable by my application'.
So basically I test whether: 1) I can open the SQLite database properly 2) I can perform queries on the database and 3) Whether the result for a pre-defined query returns what is expected.
So basically: include a table with a record of known ID that gives a value that you know, then try to read that value. Checking the table count can't hope.
That said I'm hoping someone here with a good knowledge of DB systems will explain a) exactly what PRAGMA integrity_check does and b) how reliable it is and how efficient it is compared with manual table checks.
回答2:
http://www.sqlite.org/pragma.html#pragma_integrity_check.
回答3:
In Api 11, SQLiteDatabase has a method isDatabaseIntegrityOk for checking integrity of SQLite databases :
http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html#isDatabaseIntegrityOk()
And source code is avaible here :
https://github.com/android/platform_frameworks_base/blob/ics-mr1-release/core/java/android/database/sqlite/SQLiteDatabase.java#L2585
It's easy to backport on old devices.
回答4:
I would prefer second approach on the first one both with respect to performance and ease of coding.
来源：https://stackoverflow.com/questions/5404925/how-to-check-sqlite-file-consistency-health-check