/**
* Flush the entire cache
* @param when when the cache should be flushed (0 == immediately)
*/
void flush(uint32_t when __attribute__((unused)))
{
/* @TODO implement support for when != 0 */
ib_trx_t transaction= ib_trx_begin(IB_TRX_REPEATABLE_READ);
ib_crsr_t cursor= NULL;
ib_err_t err= DB_SUCCESS;
checked(ib_cursor_open_table(tablename, transaction, &cursor));
checked(ib_cursor_first(cursor));
checked(ib_cursor_lock(cursor, IB_LOCK_X));
do
{
checked(ib_cursor_delete_row(cursor));
} while ((err= ib_cursor_next(cursor)) == DB_SUCCESS);
if (err != DB_END_OF_INDEX)
{
fprintf(stderr, "Failed to flush the cache: %s\n", ib_strerror(err));
goto error_exit;
}
ib_cursor_close(cursor);
cursor= NULL;
checked(ib_trx_commit(transaction));
return;
error_exit:
if (cursor != NULL)
ib_cursor_close(cursor);
ib_err_t error= ib_trx_rollback(transaction);
if (error != DB_SUCCESS)
fprintf(stderr, "Failed to roll back the transaction:\n\t%s\n",
ib_strerror(error));
}
/**
* Delete an item from the cache
* @param trx the transaction to use
* @param key the key of the item to delete
* @param nkey the length of the key
* @return true if we should go ahead and commit the transaction
* or false if we should roll back (if the key didn't exists)
*/
static bool do_delete_item(ib_trx_t trx, const void* key, size_t nkey) {
ib_crsr_t cursor= NULL;
bool retval= false;
if (do_locate_item(trx, key, nkey, &cursor))
{
checked(ib_cursor_lock(cursor, IB_LOCK_X));
checked(ib_cursor_delete_row(cursor));
retval= true;
}
/* Release resources */
/* FALLTHROUGH */
error_exit:
if (cursor != NULL)
ib_cursor_close(cursor);
return retval;
}
/**********************************************************************
DELETE FROM t2 WHERE c1 == 9
@return DB_SUCCESS or error code */
static
ib_err_t
delete_t2(
/*======*/
void* arg) /*!< in: arguments for callback */
{
ib_err_t err;
int res = ~0;
int nine = 9;
ib_tpl_t key_tpl = NULL;
ib_crsr_t crsr = NULL;
cb_args_t* cb_arg = (cb_args_t *)arg;
tbl_class_t* tbl = cb_arg->tbl;
//fprintf(stderr, "t2: DELETE\n");
err = open_table(tbl->db_name, tbl->name, cb_arg->trx, &crsr);
if (err != DB_SUCCESS) {
goto err_exit;
}
err = ib_cursor_lock(crsr, IB_LOCK_IX);
if (err != DB_SUCCESS) {
goto err_exit;
}
err = ib_cursor_set_lock_mode(crsr, IB_LOCK_X);
if (err != DB_SUCCESS) {
goto err_exit;
}
/* Create a tuple for searching an index. */
key_tpl = ib_sec_search_tuple_create(crsr);
assert(key_tpl != NULL);
/* Set the value to delete. */
err = ib_col_set_value(key_tpl, 0, &nine, 4);
assert(err == DB_SUCCESS);
/* Search for the key using the cluster index (PK) */
err = ib_cursor_moveto(crsr, key_tpl, IB_CUR_GE, &res);
if (res != 0) {
goto clean_exit;
}
if (err != DB_SUCCESS) {
goto err_exit;
}
/* InnoDB handles the updating of all secondary indexes. */
err = ib_cursor_delete_row(crsr);
if (err != DB_SUCCESS) {
goto err_exit;
}
update_err_stats(cb_arg->err_st, err);
goto clean_exit;
err_exit:
update_err_stats(cb_arg->err_st, err);
clean_exit:
if (key_tpl != NULL) {
ib_tuple_delete(key_tpl);
}
if (crsr != NULL) {
ib_err_t err2;
err2 = ib_cursor_close(crsr);
assert(err2 == DB_SUCCESS);
crsr = NULL;
}
return(err);
}
