[英]Using MyISAM table to increment multiple values on mysql
I have this table: cd_biblio which has a list of books. 我有此表:cd_biblio,其中具有书籍列表。
When I insert a new book from my php page, I want to increment a field ('Ingresso') based on the value 'Class' I inserted. 当我从php页面插入一本新书时,我想根据插入的值'Class'增加一个字段('Ingresso')。
For example: 例如:
I insert a new book with class 'A', his 'Ingresso' value will be the current max of 'Ingresso' for the class 'A' + 1. 我插入一本类别为'A'的新书,他的'Ingresso'值将是该类'A'+ 1的当前'Ingresso'最大值。
How can I do this using MyISAM? 如何使用MyISAM执行此操作?
use prodedures or triggers fe: 使用程序或触发fe:
delimiter ~
CREATE PROCEDURE AddBook(...)
BEGIN
DECLARE gIngresso INT DEFAULT 0;
SELECT Max(Ingresso) INTO gIngresso FROM Table;
INSERT INTO Table VALUE(... , gIngresso)
END~
delimiter ;
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