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Make SQLITE_DIRECT_OVERFLOW_READ work for in WAL mode as long as the page

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being read is not in the the -wal file.

FossilOrigin-Name: 9879be1899adf5634f551a2077b15ccb1133e4e3
This commit is contained in:
drh
2017-01-26 02:26:02 +00:00
parent 2b15f6e11b
commit d930b5cb06
5 changed files with 27 additions and 19 deletions
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18
src/pager.c
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@@ -814,14 +814,20 @@ static const unsigned char aJournalMagic[] = {
#define isOpen(pFd) ((pFd)->pMethods!=0)
/*
** Return true if this pager uses a write-ahead log instead of the usual
** rollback journal. Otherwise false.
** Return true if this pager uses a write-ahead log to read page pgno.
** Return false if the pager reads pgno directly from the database.
*/
#ifndef SQLITE_OMIT_WAL
int sqlite3PagerUseWal(Pager *pPager){
return (pPager->pWal!=0);
#if !defined(SQLITE_OMIT_WAL) && defined(SQLITE_DIRECT_OVERFLOW_READ)
int sqlite3PagerUseWal(Pager *pPager, Pgno pgno){
u32 iRead = 0;
int rc;
if( pPager->pWal==0 ) return 0;
rc = sqlite3WalFindFrame(pPager->pWal, pgno, &iRead);
return rc || iRead;
}
# define pagerUseWal(x) sqlite3PagerUseWal(x)
#endif
#ifndef SQLITE_OMIT_WAL
# define pagerUseWal(x) ((x)->pWal!=0)
#else
# define pagerUseWal(x) 0
# define pagerRollbackWal(x) 0