08 2020 档案

MySQL添加索引
摘要：1.添加PRIMARY KEY（主键索引） mysql>ALTER TABLE `table_name` ADD PRIMARY KEY ( `column` ) 2.添加UNIQUE(唯一索引) mysql>ALTER TABLE `table_name` ADD UNIQUE ( `column 阅读全文
posted @ 2020-08-23 20:18 凉凉12 阅读(1033) 评论(0) 推荐(0)
Eclipse导入项目后JSP页面出现报红
摘要：Multiple annotations found at this line:- javax.servlet.jsp.JspException cannot be resolved to a type- Attribute (width) is obsolete. Its use is disco 阅读全文
posted @ 2020-08-22 20:44 凉凉12 阅读(912) 评论(0) 推荐(0)