> It is a fatal error. The only time it is okay is after the file is first
> created (zero length) ...
Really? But I have seen many location seems not like you sad. For example:
In pager_playback:
}else if( rc==SQLITE_IOERR_SHORT_READ ){
/* If the journal has been truncated, simply stop reading and
** processing the journal. This might happen if the journal was
** not completely written and synced prior to a crash. In that
** case, the database should have never been written in the
** first place so it is OK to simply abandon the rollback. */
rc = SQLITE_OK;
goto end_playback;
In readDbPage:
if( rc==SQLITE_OK && !isInWal ){
i64 iOffset = (pgno-1)*(i64)pPager->pageSize;
rc = sqlite3OsRead(pPager->fd, pPg->pData, pgsz, iOffset);
if( rc==SQLITE_IOERR_SHORT_READ ){
rc = SQLITE_OK;
}
}
And so on.
All these codes are dealing with the header?
--
Best Regards
BaiYang
baiy...@263.net.cn
http://baiy.cn
**** < END OF EMAIL > ****
From: Roger Binns
Date: 2012-04-27 07:06
To: General Discussion of SQLite Database
Subject: Re: [sqlite] the xRead method in sqlite3_io_methods
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On 26/04/12 15:27, BaiYang wrote:
> I'm confused, does you mean a xRead should NEVER return a
> "SQLITE_IOERR_SHORT_READ" ?
It is a fatal error. The only time it is okay is after the file is first
created (zero length) and SQLite tries to read the header page which
doesn't exist at that point in time.
At all other times a short error is fatal. The extended error code is so
that the caller has more details than just I/O error.
Roger
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