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ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

liuyf8688 — Sun, 26 Apr 2015 09:44:00 GMT

1. 通过DMG方式，安装完MySQL后，在shell命令行中尝试使用mysql -u root连接MySQL，出现下面提示。

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

由于根据本地环境及软件版本，没有统一的解决方案，下面我将说明我的软件环境。

软件说明：

Mac OS - 10.10.2 (OS X Yosemite)

MySQL - Ver 14.14 Distrib 5.7.7-rc, for osx10.8 (x86_64)

解决方案（暂时没有找到理想方案，所以尝试重置root密码：

1. 停止MySQL，使用跳过权限控制方案启动

1.1 使用Preference Pane关闭MySQL

双击MySQL，可能会要求你输入密码，输入密码后，将会打开如下窗口。

点击“Stop MySQL Server”，输入密码后，绿色的“running”将会变成红色的“stopped” ,说明MySQL被正常关闭。

1.2通过跳过权限控制启动

shell命令行输入以下命令回车

sudo mysqld_safe --skip-grant-tables

输入管理员密码后，显示如下提示，说明启动成功

150426 13:32:39 mysqld_safe Logging to '/usr/local/mysql/data/xxxMacBook-Pro.local.err'.

150426 13:32:39 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

2. 如果以上全部成功，现在可以开始重置root密码了

开启新的shell窗口，输入mysql -u root，现在可以进入mysql了。

今次执行以下命令。

mysql> FLUSH PRIVILEGES;

根据版本不同，请执行不同的命令：

MySQL 5.7.6 and later:

mysql> ALTER USER ‘root’@‘localhost’ IDENTITIED BY ‘123456’;

MySQL 5.7.5 and earlier:

mysql> SET PASSWORD FOR ‘root’@‘localhost’ = PASSWORD(‘123456’);

3. 停止MySQL服务器，正常重启。现在你可以使用新的密码登录root用户了。

liuyf8688 2015-04-26 17:44 发表评论

Copying a Table in MySQL and including the Primary Key

liuyf8688 — Thu, 26 Mar 2015 03:36:00 GMT

CREATE TABLE new_table LIKE old_table;
INSERT INTO new_table SELECT * FROM old_table;

liuyf8688 2015-03-26 11:36 发表评论

MySQL 存储过程示例

liuyf8688 — Thu, 06 Mar 2014 13:41:00 GMT

1 CREATE DEFINER = 'unisoft'@'%'
2 PROCEDURE unisoftdb.distributePoolId(IN poolNum int)
3 BEGIN
4
5     -- 遍历公司的游标结束条件
6     DECLARE done BOOLEAN DEFAULT FALSE;
7     -- 接收游标中公司ID
8     DECLARE id_val bigint;
9     -- 接收游标中公司的POOL_ID
10     DECLARE poolId_val int;
11     -- 用于循环poolNum的循环变量
12     DECLARE i int;
13     -- 存储每个POOL_ID对应的总记录数 (统计本POOL_ID关联的所有公司联系人数量)
14     DECLARE totalSum int;
15     -- 存储侯选的POOL_ID
16     DECLARE canPoolId bigint;
17     -- 存储侯选的POOL_ID对应的记录数
18     DECLARE minSum int;
19
20     -- 声明遍历公司的游标
21     DECLARE cursor_company_test CURSOR FOR SELECT id, pool_id FROM company_test ORDER BY ID DESC;
22     DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
23
24     OPEN cursor_company_test;
25
26     read_loop: LOOP
27
28       FETCH cursor_company_test INTO id_val, poolId_val;
29
30       IF done THEN
31         CLOSE cursor_company_test;
32         LEAVE read_loop;
33       END IF;
34
35       -- 只处理POOL_ID为零的情况
36       IF poolId_val = 0 THEN
37
38         -- 重置内循环变量
39         SET i = 1;
40         SET totalSum = 0;
41         SET minSum = 0;
42         SET canPoolId = 0;
43
44         pro_loop: LOOP
45
46           -- 统计POOL_ID对应的记录数
47           SELECT IFNULL(SUM(cp.contact_num), 0) INTO totalSum FROM company_test c INNER JOIN company_property cp ON c.id = cp.id AND c.pool_id = i;
48
49           IF i > poolNum THEN
50             LEAVE pro_loop;
51           END IF;
52
53           IF i = 1 THEN
54             SET minSum = totalSum;
55             SET canPoolId = i;
56           END IF;
57
58           IF totalSum < minSum THEN
59             SET minSum = totalSum;
60             SET canPoolId = i;
61           END IF;
62
63           SET i = i + 1;
64         END LOOP pro_loop;
65
66         -- print pool id
67         UPDATE company_test SET POOL_ID = canPoolId WHERE ID = id_val;
68         -- SELECT id_val, canPoolId;
69
70       END IF;
71
72     END LOOP read_loop;
73
74   END

liuyf8688 2014-03-06 21:41 发表评论

MySQL查询时会忽略字段末尾的空格

liuyf8688 — Wed, 28 Aug 2013 14:21:00 GMT

liuyf8688 2013-08-28 22:21 发表评论

CentOS 6.0下安装MySQL 5.5.21

liuyf8688 — Sat, 24 Mar 2012 16:20:00 GMT

1.安装cmake

(1)www.cmake.org下载最新包。

(2)编译安装

./bootstrap (第一次安装，如果已安装cmake；可以使用cmake cmake解压目录)

make

make install

2.安装MySql

(1)创建帐号

groupadd mysql

useradd -r -g mysql mysql

(2)解压并编译安装

tar zxvf mysql-VERSION.tar.gz

cd mysql-VERSION

// cmake [-DCMAKE_INSTALL_PREFIX=dir_name -DDEFAULT_CHARSET=charset_name -DDEFAULT_COLLATION=collation_name](optional) .

cmake -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci .

(charset: utf8; collation: utf8_general_ci)

make

make install

(3)设置mysql安装目录的归档信息

cd /usr/local/mysql

chown -R mysql .

chgrp -R mysql .

chown -R root .

chown -R mysql data

(5)安装数据库

scripts/mysql_install_db --user=mysql

(6)替换my.cnf文件

cp support-files/my-medium.cnf /etc/my.cnf

(7)启动MySQL

nohup bin/mysqld_safe --user=mysql &

如果启动不成功，执行以下命令：

cat data/localhost.localdomain.err

如果出现12步的问题，可能是数据库没有安装成功，重新执行第5步；然后重新执行第7步。

(8)对于生产环境来说，还需要做以下操作

./bin/mysqladmin -u root password 'new-password'

./bin/mysqladmin -u root -h localhost.localdomain password 'new-password'

或

./bin/mysql_secure_installation

(9)设置系统启动时，启动MySQL

cp support-files/mysql.server /etc/init.d/mysql

chmod +x /etc/init.d/mysql

chkconfig --add /etc/init.d/mysql

(10)创建用户并授权远程访问

./bin/mysql -u root -p (进入mysql命令行)

insert into mysql.user(host, user, password) values ("localhost", "mysql", password("123456"));

grant all privileges on *.* to 'mysql'@'%' identified by '123456';

flush privileges;

(11)配置iptables，开放mysql端口

vi /etc/sysconfig/iptables

在COMMIT前，添加下面这句话：

-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT

service iptables save

service iptables restart

(12)解决以下问题

(10.1)/usr/local/mysql/bin/mysqld: Table 'mysql.plugin' doesn't exist

(10.2)[ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

出现以上问题，是由于mysql_install_db安装不对，请重新安装。

注：1.查找mysql_install_db的位置

find / -name mysql_install_db

Installing MySQL system tables...

Filling help tables...

To start mysqld at boot time you have to copy

support-files/mysql.server to the right place for your system

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !

To do so, start the server, then issue the following commands:

./bin/mysqladmin -u root password 'new-password'

./bin/mysqladmin -u root -h localhost.localdomain password 'new-password'

Alternatively you can run:

./bin/mysql_secure_installation

which will also give you the option of removing the test

databases and anonymous user created by default. This is

strongly recommended for production servers.

See the manual for more instructions.

You can start the MySQL daemon with:

cd . ; ./bin/mysqld_safe &

You can test the MySQL daemon with mysql-test-run.pl

cd ./mysql-test ; perl mysql-test-run.pl

Please report any problems with the ./bin/mysqlbug script!

liuyf8688 2012-03-25 00:20 发表评论