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Generalize the sqlite3_dbpage virtual table so that it is able to write

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new pages onto the end of the database file using INSERT.

FossilOrigin-Name: fe0d67e72d4228661c021f227bfc0d5ddb1b726db0f36c7221ead8dd8bd1dc73
This commit is contained in:
drh
2024-09-09 18:45:58 +00:00
parent 9c2f068ebd
commit 882aba4090
3 changed files with 26 additions and 22 deletions
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31
src/dbpage.c
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@ -321,7 +321,6 @@ static int dbpageUpdate(
DbPage *pDbPage = 0;
int rc = SQLITE_OK;
char *zErr = 0;
const char *zSchema;
int iDb;
Btree *pBt;
Pager *pPager;
@ -336,21 +335,27 @@ static int dbpageUpdate(
zErr = "cannot delete";
goto update_fail;
}
pgno = sqlite3_value_int(argv[0]);
if( sqlite3_value_type(argv[0])==SQLITE_NULL
|| (Pgno)sqlite3_value_int(argv[1])!=pgno
){
zErr = "cannot insert";
goto update_fail;
if( sqlite3_value_type(argv[0])==SQLITE_NULL ){
pgno = (Pgno)sqlite3_value_int(argv[2]);
}else{
pgno = sqlite3_value_int(argv[0]);
if( (Pgno)sqlite3_value_int(argv[1])!=pgno ){
zErr = "cannot insert";
goto update_fail;
}
}
zSchema = (const char*)sqlite3_value_text(argv[4]);
iDb = ALWAYS(zSchema) ? sqlite3FindDbName(pTab->db, zSchema) : -1;
if( NEVER(iDb<0) ){
zErr = "no such schema";
goto update_fail;
if( sqlite3_value_type(argv[4])==SQLITE_NULL ){
iDb = 0;
}else{
const char *zSchema = (const char*)sqlite3_value_text(argv[4]);
iDb = zSchema ? sqlite3FindDbName(pTab->db, zSchema) : -1;
if( iDb<0 ){
zErr = "no such schema";
goto update_fail;
}
}
pBt = pTab->db->aDb[iDb].pBt;
if( NEVER(pgno<1) || NEVER(pBt==0) || NEVER(pgno>sqlite3BtreeLastPage(pBt)) ){
if( pgno<1 || NEVER(pBt==0) ){
zErr = "bad page number";
goto update_fail;
}