Mysql 错误问题汇总(不断更新中)

1、mysql errono 1005 : 主外键不是完全一致 , 请检查如下几点:

a、字段是否存在
b、类型是否一致(注意unsigned , powerdesign 生成问题)
c、数据库引擎是否一致
d、字符编码是否一致
e、windows平台下注意修改lower_case_table_names = 0, windows本身不区分文件大小写,改为0之后就区分了可能造成找不到引用的表

2、mysql errono 121: 外键约束名称重复

3、记录 mysql workbench 中单词缩写意义：
pk: primary key (column is part of a pk)
nn: not null (column is nullable)
uq: unique (column is part of a unique key)
ai: auto increment (the column is auto incremented when rows are inserted)
bin: binary (if dt is a blob or similar, this indicates that is binary data, rather than text)
un: unsigned (for integer types, see docs: “10.2. numeric types”)
zf: zero fill (rather a display related flag, see docs: “10.2. numeric types”)

4、mysql 权限设置
//添加远程主机访问mysql root权限
insert into user(host,user,password) values('%','root',password('root'));
//root 权限授权
grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;
//更新权限设置
flush privileges;

5、防火墙设置
//打开端口
/sbin/iptables -i input -p tcp --dport 3306 -j accept
//保存
/etc/rc.d/init.d/iptables save
//查看状态
/etc/init.d/iptables status

6、开机自动运行(实现类似windows服务)
/sbin/chkconfig --level 2345 mysqld on
/sbin/chkconfig --list
结果如下:
mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off