1. navicat 连接不上本地库
navicat报caching-sha2-password错误
首先本地启动并登陆mysql：
net start mysql
mysql -u root -p
然后处理：
- ALTER USER ‘root’@‘localhost’ IDENTIFIED BY ‘password’ PASSWORD EXPIRE NEVER; #修改加密规则
- ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password BY ‘password’; #更新一下用户的密码
- FLUSH PRIVILEGES; #刷新权限
- 再重置下密码：alter user ‘root’@‘localhost’ identified by ‘123qwe’;
2. navicat导入数据
问题：Data too long for column ‘warnDescription’ at row 1
导入的数据长度太长了，
mysql 修改字段长度：
如：news 表里的title 字段 原来长度是 100个字符，现长度要改成130个字符
alter table news modify column title varchar(130);
3.mysql显示每一列的类型
show columns from warn_info
