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If the user has not set it explicitly, set the "PRAGMA synchronous" setting to

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SQLITE_DEFAULT_SYNCHRONOUS when a database connection changes from wal to
rollback journal mode.

FossilOrigin-Name: 78030c0f52aa39fb2ab32c75c56e6bcefe6382b8df28b1909e3c911e42dbeca3
This commit is contained in:
dan
2017-03-16 18:14:39 +00:00
parent b30574bcae
commit f5da7dbb07
6 changed files with 200 additions and 24 deletions
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42
src/btree.c
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@@ -2861,6 +2861,31 @@ int sqlite3BtreeGetAutoVacuum(Btree *p){
#endif
}
/*
** If the user has not set the safety-level for this database connection
** using "PRAGMA synchronous", and if the safety-level is not already
** set to the value passed to this function as the second parameter,
** set it so.
*/
#if SQLITE_DEFAULT_SYNCHRONOUS!=SQLITE_DEFAULT_WAL_SYNCHRONOUS
static void setDefaultSyncFlag(BtShared *pBt, u8 safety_level){
sqlite3 *db;
Db *pDb;
if( (db=pBt->db)!=0 && (pDb=db->aDb)!=0 ){
while( pDb->pBt==0 || pDb->pBt->pBt!=pBt ){ pDb++; }
if( pDb->bSyncSet==0
&& pDb->safety_level!=safety_level
&& pDb!=&db->aDb[1]
){
pDb->safety_level = safety_level;
sqlite3PagerSetFlags(pBt->pPager,
pDb->safety_level | (db->flags & PAGER_FLAGS_MASK));
}
}
}
#else
# define setDefaultSyncFlag(pBt)
#endif
/*
** Get a reference to pPage1 of the database file. This will
@@ -2934,26 +2959,15 @@ static int lockBtree(BtShared *pBt){
if( rc!=SQLITE_OK ){
goto page1_init_failed;
}else{
#if SQLITE_DEFAULT_SYNCHRONOUS!=SQLITE_DEFAULT_WAL_SYNCHRONOUS
sqlite3 *db;
Db *pDb;
if( (db=pBt->db)!=0 && (pDb=db->aDb)!=0 ){
while( pDb->pBt==0 || pDb->pBt->pBt!=pBt ){ pDb++; }
if( pDb->bSyncSet==0
&& pDb->safety_level==SQLITE_DEFAULT_SYNCHRONOUS+1
){
pDb->safety_level = SQLITE_DEFAULT_WAL_SYNCHRONOUS+1;
sqlite3PagerSetFlags(pBt->pPager,
pDb->safety_level | (db->flags & PAGER_FLAGS_MASK));
}
}
#endif
setDefaultSyncFlag(pBt, SQLITE_DEFAULT_WAL_SYNCHRONOUS+1);
if( isOpen==0 ){
releasePage(pPage1);
return SQLITE_OK;
}
}
rc = SQLITE_NOTADB;
}else{
setDefaultSyncFlag(pBt, SQLITE_DEFAULT_SYNCHRONOUS+1);
}
#endif