DB&SQL备忘

DB2最佳分页语句

SELECT * FROM (
        SELECT inner2_.*, ROWNUMBER() OVER(ORDER BY ORDER OF inner2_) AS rownumber_ FROM
                (SELECT * FROM IMS.IMS_PRODUCT WHERE status='G' FETCH FIRST 300 ROWS ONLY)
                AS inner2_
        ) AS inner1_
WHERE rownumber_>1 ORDER BY rownumber_

DB2简单离线备份命令

db2 backup db learning to e:
备份成功。此备份映像的时间戳记是：20150316104830

db2 restore db learning from E:
C:\Program Files (x86)\IBM\SQLLIB\BIN>db2 restore db learning from E:
SQL2539W  警告！正在复原至与备份映像数据库相同的现有数据库。数据库文件将被删除。

想要继续吗？（y/n） y
DB20000I  RESTORE DATABASE 命令成功完成。

INSERT INTO SELECT 语句

insert into ims.product(OEM_ID, MACHINE, MODEL, PSEDUO_TYPE, PSEDUO_MODEL, MODEL_SYNONYMS, STATUS, CREATED_TIME, LAST_UPDATE_TIME, LAST_UPDATE_BY)
        select OEM_ID, MACHINE, MODEL, PSEDUO_TYPE, PSEDUO_MODEL, MODEL_SYNONYMS, STATUS, CREATED_TIME, LAST_UPDATE_TIME, LAST_UPDATE_BY from ims.ims_product

如何设置远程连接MySQL

买了台阿里云服务器, 需要从家里电脑访问, 那么需要以下步骤:

首先通过在客户机上telnet命令查看服务器上的3306端口是否开启了远程访问:

telnet ayning.com
// 正在连接ayning.com...无法打开到主机的连接。 在端口 3306: 连接失败

或者在MySQL服务器上查看MySQL是否开启

root@iZ23zo60yjpZ:~# netstat -an | grep
tcp               127.0.0.1:          0.0.0.0:*               LISTEN
tcp               127.0.0.1:         127.0.0.1:          ESTABLISHED
tcp               127.0.0.1:          127.0.0.1:         ESTABLISHED
tcp               127.0.0.1:         127.0.0.1:          ESTABLISHED
tcp               127.0.0.1:         127.0.0.1:          ESTABLISHED
tcp               127.0.0.1:          127.0.0.1:         ESTABLISHED
tcp               127.0.0.1:          127.0.0.1:         ESTABLISHED
tcp               127.0.0.1:          127.0.0.1:         ESTABLISHED
tcp               127.0.0.1:         127.0.0.1:          ESTABLISHED
tcp               127.0.0.1:         127.0.0.1:          ESTABLISHED
tcp               127.0.0.1:          127.0.0.1:         ESTABLISHED

发现都没有开启, 因此需要开发MySQL 3306端口远程访问功能.

如何开启MySQL 3306端口远程访问功能.

1, 修改Mysql配置文件

编辑/etc/mysql/my.cnf文件, 注释掉下面的bind-address=127.0.0.1一行

# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
# bind-address          = 127.0.0.1

保存并重启MySQL

2, 修改数据库User表

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.10.111' IDENTIFIED BY '' WITH GRANT OPTION;
Query OK, 0 rows affected (0.02 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)

那么现在就可以远程访问MySQL了