lua weak table 经常看到lua表中有 weak table的用法, 例如: weak_table = setmetatable({}, {__mode="v"}) 官网上的解释: http://www.lua.org/pil/17.html Weak tables are the mechanism that you use to tell Lua that a reference should not prevent the reclamation of an obje
转载:https://blog.csdn.net/Fenglele_Fans/article/details/83627021 1:table.sort() language = {"lua","java","c#","c++"} table.sort(language) --只有table一个参数,使用lua默认的排序方式排序for i, v in ipairs(language) do -- print(v) --输出c#
今天在论坛里发现了一个关于ORA-04091的老帖子,收获良多,特此整理一下 关于ORA-04091: table is mutating, trigger/function may not see it的分析 当DML操作触发trigger的时候,如果trigger的程序块中需要对当前表进行修改或查询的时候,就会报错ORA-04091: table is mutating, trigger/function may not see it 这是有在被触发TRIGGER工作的时候,默认把当前表表锁
[Err] 1442 - Can't update table 'test_trigger' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. DROP TABLE IF EXISTS `test_trigger`; CREATE TABLE `test_trigger` ( `id` ) NOT NULL AUTO_INCR
Lua 内table遍历 在lua中有4种方式遍历一个table,当然,从本质上来说其实都一样,只是形式不同,这四种方式分别是: 1. ipairs for index, value in ipairs(table) do end 注:这种方式的遍历只会从key为1的地方开始,一直以key递增1的顺序来遍历,若找到一个递增不是1的key就结束遍历,无论后面是否仍然是顺序的key. --Sample_1: local tab1 = { [] = , [] = , [] = , [] = , } f
MySQL触发器更新本表数据异常:Can't update table 'tbl' in stored function/trigger because it 博客分类: 数据库 MySQLJava 如果你在触发器里面对刚刚插入的数据进行了 insert/update, 则出现这个问题.因为会造成循环的调用. Java代码 收藏代码 create trigger test before update on tablename for each row update tablename set N
MySQL: Solution for ERROR 1442 (HY000): Can't update table 'xxx' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. 今天在做触发器时发生了这个错误 原因是在对某表操作时同时触发对该表插入 估计这在mysql不允许的 不可以把触发条件和触发动作归于一表