int db_load(struct DB *db, char *db_name, size_t cache_size) {
log_info("Loading DB with name %s", db_name);
struct Metadata md = {0,0,0};
meta_load(db_name, &md);
log_info("PoolSize: %zd, PageSize %zd", md.pool_size, md.page_size);
dbi_init(db, db_name, md.page_size, md.pool_size, cache_size);
pool_init_old(db->pool, db_name, md.page_size, md.pool_size, cache_size);
db->btree_degree = btree_node_max_capacity(db);
node_btree_load(db, db->top, md.header_page);
return 0;
}
EXPORT int
p_dbi_init(
/* + */ value v_errno, type t_errno
)
{
static int initialized = 0;
if (initialized) Succeed_;
Check_Integer(t_errno);
/*
* In C error codes are negative while in Prolog they are positive !
*/
dbi_errno = - v_errno.nint;
dbi_init(); /* do any DB specific initialisation */
initialized = 1;
Succeed_;
}
/**
* @brief Initialize DB object
*
* @param[out] db Object to initialize
* @param[in] db_name File for use in Database
* @param[in] page_size Size of pages to use in PagePool
* @param[in] pool_size Size of pool to use in PagePool
*
* @return Status
*/
int db_init(struct DB *db, char *db_name, uint16_t page_size,
pageno_t pool_size, size_t cache_size) {
log_info("Creating DB with name %s", db_name);
log_info("PoolSize: %zd, PageSize %i", pool_size, page_size);
dbi_init(db, db_name, page_size, pool_size, cache_size);
pool_init_new(db->pool, db_name, page_size, pool_size, cache_size);
db->btree_degree = btree_node_max_capacity(db);
wal_init(db, db->wal);
dumper_init(db, db->pool);
node_btree_load(db, db->top, 0);
db->top->h->flags = IS_TOP | IS_LEAF;
struct Metadata md = {pool_size, page_size, db->top->h->page};
meta_dump(db_name, &md);
return 0;
}
