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Change some variable names and comments in the new in-memory database file

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implementation.  Partial (non-working) implementation of the VACUUM command. (CVS 904)

FossilOrigin-Name: e76787f877c456abdc8bc88bfefc50eaeed68744
This commit is contained in:
drh
2003-04-15 01:19:47 +00:00
parent b0208ccaa3
commit 13bff81537
9 changed files with 298 additions and 72 deletions
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53
src/main.c
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@@ -14,7 +14,7 @@
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.122 2003/04/13 18:26:51 paul Exp $
** $Id: main.c,v 1.123 2003/04/15 01:19:48 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
@@ -1057,10 +1057,31 @@ void *sqlite_commit_hook(
}
/*
** This routine is called when sqlite wants to open a btree. zFilename is
** either the name of a btree file or the magic name ":memory:" which opens an
** in-memory btree or ":temp:" which opens a temporary btree. This may either
** be in memory or backed by a temporary file depending on run-time settings.
** This routine is called to create a connection to a database BTree
** driver. If zFilename is the name of a file, then that file is
** opened and used. If zFilename is the magic name ":memory:" then
** the database is stored in memory (and is thus forgotten as soon as
** the connection is closed.) If zFilename is NULL then the database
** is for temporary use only and is deleted as soon as the connection
** is closed.
**
**
**
** A temporary database can be either a disk file (that is automatically
** deleted when the file is closed) or a set of red-black trees held in memory,
** depending on the values of the TEMP_STORE compile-time macro and the
** db->temp_store variable, according to the following chart:
**
** TEMP_STORE db->temp_store Location of temporary database
** ---------- -------------- ------------------------------
** 0 any file
** 1 1 file
** 1 2 memory
** 1 0 file
** 2 1 file
** 2 2 memory
** 2 0 memory
** 3 any memory
*/
int sqliteBtreeFactory(
const sqlite *db, /* Main database when opening aux otherwise 0 */
@@ -1069,22 +1090,16 @@ int sqliteBtreeFactory(
int nCache, /* How many pages in the page cache */
Btree **ppBtree){ /* Pointer to new Btree object written here */
assert( zFilename != 0 );
assert( ppBtree != 0);
if (strcmp(zFilename, ":memory:") == 0) {
if (ALLOWATTACHMEM) {
return sqliteRBtreeOpen(0, 0, 0, ppBtree);
} else {
return SQLITE_CANTOPEN;
}
} else if (strcmp(zFilename, ":temp:") == 0) {
if (TEMPDBINCORE == 0) {
#ifndef SQLITE_OMIT_INMEMORYDB
if( zFilename==0 ){
if (TEMP_STORE == 0) {
/* Always use file based temporary DB */
return sqliteBtreeOpen(0, omitJournal, nCache, ppBtree);
} else if (TEMPDBINCORE == 1 || TEMPDBINCORE == 2) {
} else if (TEMP_STORE == 1 || TEMP_STORE == 2) {
/* Switch depending on compile-time and/or runtime settings. */
int location = db->tmpdb_loc == 0 ? TEMPDBINCORE : db->tmpdb_loc;
int location = db->temp_store==0 ? TEMP_STORE : db->temp_store;
if (location == 1) {
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
@@ -1095,7 +1110,11 @@ int sqliteBtreeFactory(
/* Always use in-core DB */
return sqliteRBtreeOpen(0, 0, 0, ppBtree);
}
} else {
}else if( zFilename[0]==':' && strcmp(zFilename,":memory:")==0 ){
return sqliteRBtreeOpen(0, 0, 0, ppBtree);
}else
#endif
{
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
}
}