strstrReturns a pointer to the first occurrence of str2 in str1, or a null pointer if str2 is not part of str1.查找 substr 所指的空终止字节字符串在 str 所指的空终止字节字符串中的首次出现。不比较空终止字符。...
在MySQL中,创建触发器语法如下:CREATE TRIGGER trigger_nametrigger_timetrigger_event ON tbl_nameFOR EACH ROWtrigger_stmt其中:trigger_name:标识触发器名称,用户自行指定;trigger_time:标识触发时机,取值为 BEFORE 或 AFTER;trig