database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-14 00:22:38 +03:00
Code Activity

Use the read and write version fields of the database header to mark a database as operating in wal-mode.

Browse Source 
FossilOrigin-Name: 96bef18c1411c3e0348295886f105e1646c46320
This commit is contained in:
dan
2010-04-20 18:53:15 +00:00
parent 8d22a17411
commit e04dc88be5
10 changed files with 327 additions and 128 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
src/pragma.c
View File

@@ -257,6 +257,28 @@ static const char *actionName(u8 action){
}
#endif
/*
** Parameter eMode must be one of the PAGER_JOURNALMODE_XXX constants
** defined in pager.h. This function returns the associated lowercase
** journal-mode name.
*/
const char *sqlite3JournalModename(int eMode){
static char * const azModeName[] = {
"delete", "persist", "off", "truncate", "memory", "wal"
};
assert( PAGER_JOURNALMODE_DELETE==0 );
assert( PAGER_JOURNALMODE_PERSIST==1 );
assert( PAGER_JOURNALMODE_OFF==2 );
assert( PAGER_JOURNALMODE_TRUNCATE==3 );
assert( PAGER_JOURNALMODE_MEMORY==4 );
assert( PAGER_JOURNALMODE_WAL==5 );
assert( eMode>=0 && eMode<=ArraySize(azModeName) );
if( eMode==ArraySize(azModeName) ) return 0;
return azModeName[eMode];
}
/*
** Process a pragma statement.
**
@@ -513,18 +535,21 @@ void sqlite3Pragma(
** PRAGMA [database.]journal_mode = (delete|persist|off|truncate|memory)
*/
if( sqlite3StrICmp(zLeft,"journal_mode")==0 ){
int eMode;
static char * const azModeName[] = {
"delete", "persist", "off", "truncate", "memory", "wal"
};
int eMode; /* One of the PAGER_JOURNALMODE_XXX symbols */
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "journal_mode", SQLITE_STATIC);
if( zRight==0 ){
eMode = PAGER_JOURNALMODE_QUERY;
}else{
const char *zMode;
int n = sqlite3Strlen30(zRight);
eMode = sizeof(azModeName)/sizeof(azModeName[0]) - 1;
while( eMode>=0 && sqlite3StrNICmp(zRight, azModeName[eMode], n)!=0 ){
eMode--;
for(eMode=0; (zMode = sqlite3JournalModename(eMode)); eMode++){
if( sqlite3StrNICmp(zRight, zMode, n)==0 ) break;
}
if( !zMode ){
eMode = PAGER_JOURNALMODE_QUERY;
}
}
if( pId2->n==0 && eMode==PAGER_JOURNALMODE_QUERY ){
@@ -533,40 +558,32 @@ void sqlite3Pragma(
** the journal-mode of the main database).
*/
eMode = db->dfltJournalMode;
sqlite3VdbeAddOp2(v, OP_String8, 0, 1);
sqlite3VdbeChangeP4(v, -1, sqlite3JournalModename(eMode), P4_STATIC);
}else{
Pager *pPager;
if( pId2->n==0 ){
int ii;
if( pId2->n==0 && eMode!=PAGER_JOURNALMODE_WAL ){
/* This indicates that no database name was specified as part
** of the PRAGMA command. In this case the journal-mode must be
** set on all attached databases, as well as the main db file.
**
** Also, the sqlite3.dfltJournalMode variable is set so that
** any subsequently attached databases also use the specified
** journal mode.
** journal mode. Except, the default journal mode is never set
** to WAL.
*/
int ii;
assert(pDb==&db->aDb[0]);
for(ii=1; ii<db->nDb; ii++){
if( db->aDb[ii].pBt ){
pPager = sqlite3BtreePager(db->aDb[ii].pBt);
sqlite3PagerJournalMode(pPager, eMode);
}
}
db->dfltJournalMode = (u8)eMode;
}
pPager = sqlite3BtreePager(pDb->pBt);
eMode = sqlite3PagerJournalMode(pPager, eMode);
for(ii=db->nDb-1; ii>=0; ii--){
if( db->aDb[ii].pBt && (ii==iDb || pId2->n==0) ){
sqlite3VdbeUsesBtree(v, ii);
sqlite3VdbeAddOp3(v, OP_JournalMode, ii, 1, eMode);
}
}
}
assert( eMode==PAGER_JOURNALMODE_DELETE
|| eMode==PAGER_JOURNALMODE_TRUNCATE
|| eMode==PAGER_JOURNALMODE_PERSIST
|| eMode==PAGER_JOURNALMODE_OFF
|| eMode==PAGER_JOURNALMODE_WAL
|| eMode==PAGER_JOURNALMODE_MEMORY );
sqlite3VdbeSetNumCols(v, 1);
sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "journal_mode", SQLITE_STATIC);
sqlite3VdbeAddOp4(v, OP_String8, 0, 1, 0,
azModeName[eMode], P4_STATIC);
sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 1);
}else