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Overview
| Comment: | Have user interfaces report out the filename of in-memory databases as an empty string, as it always has. This simplifies the changes. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | shared-cache-memdb |
| Files: | files | file ages | folders |
| SHA1: |
595dfdbffefb2598cba89980f885289d |
| User & Date: | drh 2012-05-27 01:19:04 |
Context
|
2012-05-27
| ||
| 22:42 | Merge into trunk the changes that permit :memory: databases to use shared cache. check-in: e72179f3 user: drh tags: trunk | |
| 01:19 | Have user interfaces report out the filename of in-memory databases as an empty string, as it always has. This simplifies the changes. Closed-Leaf check-in: 595dfdbf 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.
1782 1782 mutexOpen = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_OPEN); 1783 1783 sqlite3_mutex_enter(mutexOpen); 1784 1784 mutexShared = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 1785 1785 sqlite3_mutex_enter(mutexShared); 1786 1786 #endif 1787 1787 for(pBt=GLOBAL(BtShared*,sqlite3SharedCacheList); pBt; pBt=pBt->pNext){ 1788 1788 assert( pBt->nRef>0 ); 1789 - if( 0==strcmp(zFullPathname, sqlite3PagerFilename(pBt->pPager)) 1789 + if( 0==strcmp(zFullPathname, sqlite3PagerFilename(pBt->pPager, 0)) 1790 1790 && sqlite3PagerVfs(pBt->pPager)==pVfs ){ 1791 1791 int iDb; 1792 1792 for(iDb=db->nDb-1; iDb>=0; iDb--){ 1793 1793 Btree *pExisting = db->aDb[iDb].pBt; 1794 1794 if( pExisting && pExisting->pBt==pBt ){ 1795 1795 sqlite3_mutex_leave(mutexShared); 1796 1796 sqlite3_mutex_leave(mutexOpen); ................................................................................ 8047 8047 *pnErr = sCheck.nErr; 8048 8048 if( sCheck.nErr==0 ) sqlite3StrAccumReset(&sCheck.errMsg); 8049 8049 return sqlite3StrAccumFinish(&sCheck.errMsg); 8050 8050 } 8051 8051 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */ 8052 8052 8053 8053 /* 8054 -** Return the full pathname of the underlying database file. 8054 +** Return the full pathname of the underlying database file. Return 8055 +** an empty string if the database is in-memory or a TEMP database. 8055 8056 ** 8056 8057 ** The pager filename is invariant as long as the pager is 8057 8058 ** open so it is safe to access without the BtShared mutex. 8058 8059 */ 8059 8060 const char *sqlite3BtreeGetFilename(Btree *p){ 8060 8061 assert( p->pBt->pPager!=0 ); 8061 - return sqlite3PagerFilename(p->pBt->pPager); 8062 + return sqlite3PagerFilename(p->pBt->pPager, 1); 8062 8063 } 8063 8064 8064 8065 /* 8065 8066 ** Return the pathname of the journal file for this database. The return 8066 8067 ** value of this routine is the same regardless of whether the journal file 8067 8068 ** has been created or not. 8068 8069 **
Changes to src/pager.c.
4356 4356 4357 4357 /* Set the output variable to NULL in case an error occurs. */ 4358 4358 *ppPager = 0; 4359 4359 4360 4360 #ifndef SQLITE_OMIT_MEMORYDB 4361 4361 if( flags & PAGER_MEMORY ){ 4362 4362 memDb = 1; 4363 - if( zFilename ){ 4363 + if( zFilename && zFilename[0] ){ 4364 4364 zPathname = sqlite3DbStrDup(0, zFilename); 4365 4365 if( zPathname==0 ) return SQLITE_NOMEM; 4366 4366 nPathname = sqlite3Strlen30(zPathname); 4367 4367 zFilename = 0; 4368 4368 } 4369 4369 } 4370 4370 #endif ................................................................................ 6297 6297 } 6298 6298 6299 6299 return rc; 6300 6300 } 6301 6301 6302 6302 /* 6303 6303 ** Return the full pathname of the database file. 6304 +** 6305 +** Except, if the pager is in-memory only, then return an empty string if 6306 +** nullIfMemDb is true. This routine is called with nullIfMemDb==1 when 6307 +** used to report the filename to the user, for compatibility with legacy 6308 +** behavior. But when the Btree needs to know the filename for matching to 6309 +** shared cache, it uses nullIfMemDb==0 so that in-memory databases can 6310 +** participate in shared-cache. 6304 6311 */ 6305 -const char *sqlite3PagerFilename(Pager *pPager){ 6306 - return pPager->zFilename; 6312 +const char *sqlite3PagerFilename(Pager *pPager, int nullIfMemDb){ 6313 + return (nullIfMemDb && pPager->memDb) ? "" : pPager->zFilename; 6307 6314 } 6308 6315 6309 6316 /* 6310 6317 ** Return the VFS structure for the pager. 6311 6318 */ 6312 6319 const sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){ 6313 6320 return pPager->pVfs; ................................................................................ 6744 6751 6745 6752 /* 6746 6753 ** Return true if the underlying VFS for the given pager supports the 6747 6754 ** primitives necessary for write-ahead logging. 6748 6755 */ 6749 6756 int sqlite3PagerWalSupported(Pager *pPager){ 6750 6757 const sqlite3_io_methods *pMethods = pPager->fd->pMethods; 6751 - return pPager->memDb==0 && 6752 - (pPager->exclusiveMode || (pMethods->iVersion>=2 && pMethods->xShmMap)); 6758 + return pPager->exclusiveMode || (pMethods->iVersion>=2 && pMethods->xShmMap); 6753 6759 } 6754 6760 6755 6761 /* 6756 6762 ** Attempt to take an exclusive lock on the database file. If a PENDING lock 6757 6763 ** is obtained instead, immediately release it. 6758 6764 */ 6759 6765 static int pagerExclusiveLock(Pager *pPager){
Changes to src/pager.h.
147 147 int sqlite3PagerWalFramesize(Pager *pPager); 148 148 #endif 149 149 150 150 /* Functions used to query pager state and configuration. */ 151 151 u8 sqlite3PagerIsreadonly(Pager*); 152 152 int sqlite3PagerRefcount(Pager*); 153 153 int sqlite3PagerMemUsed(Pager*); 154 -const char *sqlite3PagerFilename(Pager*); 154 +const char *sqlite3PagerFilename(Pager*, int); 155 155 const sqlite3_vfs *sqlite3PagerVfs(Pager*); 156 156 sqlite3_file *sqlite3PagerFile(Pager*); 157 157 const char *sqlite3PagerJournalname(Pager*); 158 158 int sqlite3PagerNosync(Pager*); 159 159 void *sqlite3PagerTempSpace(Pager*); 160 160 int sqlite3PagerIsMemdb(Pager*); 161 161 void sqlite3PagerCacheStat(Pager *, int, int, int *);
Changes to src/test_btree.c.
29 29 Tcl_Obj *CONST objv[] 30 30 ){ 31 31 #ifndef SQLITE_OMIT_SHARED_CACHE 32 32 extern BtShared *sqlite3SharedCacheList; 33 33 BtShared *pBt; 34 34 Tcl_Obj *pRet = Tcl_NewObj(); 35 35 for(pBt=GLOBAL(BtShared*,sqlite3SharedCacheList); pBt; pBt=pBt->pNext){ 36 - const char *zFile = sqlite3PagerFilename(pBt->pPager); 36 + const char *zFile = sqlite3PagerFilename(pBt->pPager, 1); 37 37 Tcl_ListObjAppendElement(interp, pRet, Tcl_NewStringObj(zFile, -1)); 38 38 Tcl_ListObjAppendElement(interp, pRet, Tcl_NewIntObj(pBt->nRef)); 39 39 } 40 40 Tcl_SetObjResult(interp, pRet); 41 41 #endif 42 42 return TCL_OK; 43 43 }
Changes to src/vdbe.c.
5507 5507 pBt = db->aDb[pOp->p1].pBt; 5508 5508 pPager = sqlite3BtreePager(pBt); 5509 5509 eOld = sqlite3PagerGetJournalMode(pPager); 5510 5510 if( eNew==PAGER_JOURNALMODE_QUERY ) eNew = eOld; 5511 5511 if( !sqlite3PagerOkToChangeJournalMode(pPager) ) eNew = eOld; 5512 5512 5513 5513 #ifndef SQLITE_OMIT_WAL 5514 - zFilename = sqlite3PagerFilename(pPager); 5514 + zFilename = sqlite3PagerFilename(pPager, 1); 5515 5515 5516 5516 /* Do not allow a transition to journal_mode=WAL for a database 5517 5517 ** in temporary storage or if the VFS does not support shared memory 5518 5518 */ 5519 5519 if( eNew==PAGER_JOURNALMODE_WAL 5520 5520 && (sqlite3Strlen30(zFilename)==0 /* Temp file */ 5521 5521 || !sqlite3PagerWalSupported(pPager)) /* No shared-memory support */
Changes to test/attach.test.
853 853 SELECT name FROM inmem.sqlite_master; 854 854 } 855 855 } {noname inmem} 856 856 do_test attach-10.2 { 857 857 lrange [execsql { 858 858 PRAGMA database_list; 859 859 }] 9 end 860 -} {4 noname {} 5 inmem :memory:} 860 +} {4 noname {} 5 inmem {}} 861 861 862 862 finish_test