mysql中使用过程中常见错误解决办法收集

2024-07-24 12:38:50

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mysql中使用过程中常见错误解决办法收集,大家可参考本文章收藏的错误解决办法.

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)  --Vevb.com

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

7、linux下安装了mysql,不能从其它机器访问,帐号已经授权从任意主机进行访问.

vi /etc/sysconfig/iptables:在后面添加:-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

service iptables restart

发现还是不行,最终发现记录要添加在:-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT 这一条前面再次重启 OK

8、忘记mysql密码

Microsoft Windows [版本 5.2.3790]

　　(C) 版权所有 1985-2003 Microsoft Corp.

　　C:Documents and SettingsAdministrator>cd D:webwww.php100.comMysqlMySQL Se

　　rver5.5bin

　　C:Documents and SettingsAdministrator>d:

　　D:webwww.php100.comMysqlMySQL Server5.5bin>mysql

　　Welcome to the MySQL monitor. Commands end with ; or g.

　　Your MySQL connection id is 1

　　Server version: 5.5.10 MySQL Community Server (GPL)

　　Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

　　Oracle is a registered trademark of Oracle Corporation and/or its

　　affiliates. Other names may be trademarks of their respective

　　owners.

　　Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

　　mysql> use mysql;

　　Database changed

　　mysql> update user set password=password("520") where user="root";

　　Query OK, 1 row affected (0.00 sec)

　　Rows matched: 1 Changed: 1 Warnings: 0

　　mysql> flush privileges;

　　Query OK, 0 rows affected (0.00 sec)

　　mysql> q

　　Bye

　　D:webwww.Vevb.comMysqlMySQL Server5.5bin>