mysql存儲過程簡單例子

1.之前經常在oracle數據庫中使用存儲過程，換到mysql后用的不多，但是有時候也用，大致記錄一下，基本和oracle的一樣。

CREATE DEFINER = `root`@`%` PROCEDURE `NewProc`()
BEGIN
  DECLARE done INT DEFAULT FALSE;
  DECLARE n_id decimal;
  DECLARE cur1 CURSOR FOR SELECT b.ID FROM book_fs AS b where b.BOOKID NOT IN (SELECT ID FROM media) ORDER BY b.ID limit 500000;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
  -- 打開游標
    OPEN cur1;
  REPEAT
    FETCH cur1 INTO n_id;
    IF NOT done THEN
            DELETE from book_fs where id = n_id;
    END IF;
  UNTIL done END REPEAT;
  CLOSE cur1;
END;

2.統計所有表數據量

use information_schema;
select table_name,table_rows from tables where TABLE_SCHEMA = 'your_DB_name' order by table_rows desc;

  -- 說明：以上語句得出的行統計數量，並不精確，是一個大約估計的數量