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Modifications to the VDBE to support more than one database file. (CVS 878)

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FossilOrigin-Name: 875da9eed981bfa27b98e95025f9fdbed74b4098
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drh
2003-03-19 03:14:00 +00:00
parent 9468c7f489
commit 001bbcbb8f
19 changed files with 451 additions and 266 deletions
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101
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.83 2003/02/12 14:09:43 drh Exp $
** $Id: btree.c,v 1.84 2003/03/19 03:14:01 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -2874,6 +2874,105 @@ int sqliteBtreeDropTable(Btree *pBt, int iTable){
return rc;
}
#if 0 /* UNTESTED */
/*
** Copy all cell data from one database file into another.
** pages back the freelist.
*/
static int copyCell(Btree *pBtFrom, BTree *pBtTo, Cell *pCell){
Pager *pFromPager = pBtFrom->pPager;
OverflowPage *pOvfl;
Pgno ovfl, nextOvfl;
Pgno *pPrev;
int rc = SQLITE_OK;
MemPage *pNew, *pPrevPg;
Pgno new;
if( NKEY(pBtTo, pCell->h) + NDATA(pBtTo, pCell->h) <= MX_LOCAL_PAYLOAD ){
return SQLITE_OK;
}
pPrev = &pCell->ovfl;
pPrevPg = 0;
ovfl = SWAB32(pBtTo, pCell->ovfl);
while( ovfl && rc==SQLITE_OK ){
rc = sqlitepager_get(pFromPager, ovfl, (void**)&pOvfl);
if( rc ) return rc;
nextOvfl = SWAB32(pBtFrom, pOvfl->iNext);
rc = allocatePage(pBtTo, &pNew, &new, 0);
if( rc==SQLITE_OK ){
rc = sqlitepager_write(pNew);
if( rc==SQLITE_OK ){
memcpy(pNew, pOvfl, SQLITE_PAGE_SIZE);
*pPrev = SWAB32(pBtTo, new);
if( pPrevPg ){
sqlitepager_unref(pPrevPg);
}
pPrev = &pOvfl->iNext;
pPrevPg = pNew;
}
}
sqlitepager_unref(pOvfl);
ovfl = nextOvfl;
}
if( pPrevPg ){
sqlitepager_unref(pPrevPg);
}
return rc;
}
#endif
#if 0 /* UNTESTED */
/*
** Copy a page of data from one database over to another.
*/
static int copyDatabasePage(
Btree *pBtFrom,
Pgno pgnoFrom,
Btree *pBtTo,
Pgno *pTo
){
MemPage *pPageFrom, *pPage;
Pgno to;
int rc;
Cell *pCell;
int idx;
rc = sqlitepager_get(pBtFrom->pPager, pgno, (void**)&pPageFrom);
if( rc ) return rc;
rc = allocatePage(pBt, &pPage, pTo, 0);
if( rc==SQLITE_OK ){
rc = sqlitepager_write(pPage);
}
if( rc==SQLITE_OK ){
memcpy(pPage, pPageFrom, SQLITE_PAGE_SIZE);
idx = SWAB16(pBt, pPage->u.hdr.firstCell);
while( idx>0 ){
pCell = (Cell*)&pPage->u.aDisk[idx];
idx = SWAB16(pBt, pCell->h.iNext);
if( pCell->h.leftChild ){
Pgno newChld;
rc = copyDatabasePage(pBtFrom, SWAB32(pBtFrom, pCell->h.leftChild),
pBtTo, &newChld);
if( rc ) return rc;
pCell->h.leftChild = SWAB32(pBtFrom, newChld);
}
rc = copyCell(pBtFrom, pBtTo, pCell);
if( rc ) return rc;
}
if( pPage->u.hdr.rightChild ){
Pgno newChld;
rc = copyDatabasePage(pBtFrom, SWAB32(pBtFrom, pPage->u.hdr.rightChild),
pBtTo, &newChld);
if( rc ) return rc;
pPage->u.hdr.rightChild = SWAB32(pBtTo, newChild);
}
}
sqlitepager_unref(pPage);
return rc;
}
#endif
/*
** Read the meta-information out of a database file.
*/