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Add support for the "memdb" VFS and the sqlite3_memdb_ptr() and

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sqlite3_memdb_config() interfaces, to enable an SQLite database to be
manipulated as an in-memory object.

FossilOrigin-Name: fb2ac2d2fa6374084f3325b41b257c7a3ace43aade4b666ec4be93b6b70dc39a
This commit is contained in:
drh
2018-01-03 01:28:46 +00:00
parent d9620b8555
commit ac442f41c1
14 changed files with 710 additions and 37 deletions
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6
src/pager.c
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@@ -4694,6 +4694,7 @@ int sqlite3PagerOpen(
int rc = SQLITE_OK; /* Return code */
int tempFile = 0; /* True for temp files (incl. in-memory files) */
int memDb = 0; /* True if this is an in-memory file */
int memJM = 0; /* Memory journal mode */
int readOnly = 0; /* True if this is a read-only file */
int journalFileSize; /* Bytes to allocate for each journal fd */
char *zPathname = 0; /* Full path to database file */
@@ -4821,7 +4822,8 @@ int sqlite3PagerOpen(
int fout = 0; /* VFS flags returned by xOpen() */
rc = sqlite3OsOpen(pVfs, pPager->zFilename, pPager->fd, vfsFlags, &fout);
assert( !memDb );
readOnly = (fout&SQLITE_OPEN_READONLY);
memJM = (fout&SQLITE_OPEN_MEMORY)!=0;
readOnly = (fout&SQLITE_OPEN_READONLY)!=0;
/* If the file was successfully opened for read/write access,
** choose a default page size in case we have to create the
@@ -4952,7 +4954,7 @@ act_like_temp_file:
setSectorSize(pPager);
if( !useJournal ){
pPager->journalMode = PAGER_JOURNALMODE_OFF;
}else if( memDb ){
}else if( memDb || memJM ){
pPager->journalMode = PAGER_JOURNALMODE_MEMORY;
}
/* pPager->xBusyHandler = 0; */