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Overview
| Comment: | Fix corner-case problems with shared-cache for in-memory databases. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | shared-cache-memdb |
| Files: | files | file ages | folders |
| SHA1: | 997ef5f61e2a603ee2c36e87c42784ca |
| User & Date: | drh 2012-05-27 00:11:02 |
Context
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2012-05-27
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| 00:11 | Fix corner-case problems with shared-cache for in-memory databases. Closed-Leaf check-in: 997ef5f6 user: drh tags: shared-cache-memdb | |
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2012-05-26
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| 20:08 | Only allow :memory: databases to share cache if there are created using a URI filename. This minimizes the risk of breakages in legacy applications that have shared-cache enabled but also use :memory: databases which they expect to keep separate. check-in: e3ad61e0 user: drh tags: shared-cache-memdb | |
Changes
Changes to src/btree.c.
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** The pager filename is invariant as long as the pager is
** open so it is safe to access without the BtShared mutex.
*/
const char *sqlite3BtreeGetFilename(Btree *p){
assert( p->pBt->pPager!=0 );
return sqlite3PagerFilename(p->pBt->pPager);
}
/*
** Return the pathname of the journal file for this database. The return
** value of this routine is the same regardless of whether the journal file
** has been created or not.
**
** The pager journal filename is invariant as long as the pager is
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** The pager filename is invariant as long as the pager is
** open so it is safe to access without the BtShared mutex.
*/
const char *sqlite3BtreeGetFilename(Btree *p){
assert( p->pBt->pPager!=0 );
return sqlite3PagerFilename(p->pBt->pPager);
}
/*
** Return true if the Btree is a persistent database, not an in-memory
** or temporary database.
*/
int sqlite3BtreePersists(Btree *p){
Pager *pPager = p->pBt->pPager;
const char *z;
assert( pPager!=0 );
return sqlite3PagerIsMemdb(pPager)==0
&& (z = sqlite3PagerFilename(pPager))!=0 && z[0]!=0;
}
/*
** Return the pathname of the journal file for this database. The return
** value of this routine is the same regardless of whether the journal file
** has been created or not.
**
** The pager journal filename is invariant as long as the pager is
|
Changes to src/btree.h.
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void *sqlite3BtreeSchema(Btree *, int, void(*)(void *)); int sqlite3BtreeSchemaLocked(Btree *pBtree); int sqlite3BtreeLockTable(Btree *pBtree, int iTab, u8 isWriteLock); int sqlite3BtreeSavepoint(Btree *, int, int); const char *sqlite3BtreeGetFilename(Btree *); const char *sqlite3BtreeGetJournalname(Btree *); int sqlite3BtreeCopyFile(Btree *, Btree *); int sqlite3BtreeIncrVacuum(Btree *); /* The flags parameter to sqlite3BtreeCreateTable can be the bitwise OR ** of the flags shown below. ** |
> |
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void *sqlite3BtreeSchema(Btree *, int, void(*)(void *));
int sqlite3BtreeSchemaLocked(Btree *pBtree);
int sqlite3BtreeLockTable(Btree *pBtree, int iTab, u8 isWriteLock);
int sqlite3BtreeSavepoint(Btree *, int, int);
const char *sqlite3BtreeGetFilename(Btree *);
const char *sqlite3BtreeGetJournalname(Btree *);
int sqlite3BtreePersists(Btree*);
int sqlite3BtreeCopyFile(Btree *, Btree *);
int sqlite3BtreeIncrVacuum(Btree *);
/* The flags parameter to sqlite3BtreeCreateTable can be the bitwise OR
** of the flags shown below.
**
|
Changes to src/pager.c.
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/* Set the output variable to NULL in case an error occurs. */
*ppPager = 0;
#ifndef SQLITE_OMIT_MEMORYDB
if( flags & PAGER_MEMORY ){
memDb = 1;
if( zFilename ){
zPathname = sqlite3DbStrDup(0, zFilename);
if( zPathname==0 ) return SQLITE_NOMEM;
nPathname = sqlite3Strlen30(zPathname);
zFilename = 0;
}
}
#endif
|
| |
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/* Set the output variable to NULL in case an error occurs. */
*ppPager = 0;
#ifndef SQLITE_OMIT_MEMORYDB
if( flags & PAGER_MEMORY ){
memDb = 1;
if( zFilename && zFilename[0] ){
zPathname = sqlite3DbStrDup(0, zFilename);
if( zPathname==0 ) return SQLITE_NOMEM;
nPathname = sqlite3Strlen30(zPathname);
zFilename = 0;
}
}
#endif
|
Changes to src/vdbeaux.c.
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}
}
/* The simple case - no more than one database file (not counting the
** TEMP database) has a transaction active. There is no need for the
** master-journal.
**
** If the return value of sqlite3BtreeGetFilename() is a zero length
** string, it means the main database is :memory: or a temp file. In
** that case we do not support atomic multi-file commits, so use the
** simple case then too.
*/
if( 0==sqlite3Strlen30(sqlite3BtreeGetFilename(db->aDb[0].pBt))
|| nTrans<=1
){
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseOne(pBt, 0);
}
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}
}
/* The simple case - no more than one database file (not counting the
** TEMP database) has a transaction active. There is no need for the
** master-journal.
**
** If the main database is :memory: or a temp file then
** we do not support atomic multi-file commits, so use the
** simple case then too.
*/
if( 0==sqlite3BtreePersists(db->aDb[0].pBt)
|| nTrans<=1
){
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
Btree *pBt = db->aDb[i].pBt;
if( pBt ){
rc = sqlite3BtreeCommitPhaseOne(pBt, 0);
}
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