日志
mysql常用show语句
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1. show character set [like 'pattern']
显示所有可利用的字符集
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | mysql> show character set like 'gbk' -> ;+---------+------------------------+-------------------+--------+| Charset | Description | Default collation | Maxlen |+---------+------------------------+-------------------+--------+| gbk | GBK Simplified Chinese | gbk_chinese_ci | 2 |+---------+------------------------+-------------------+--------+1 row in set (0.00 sec)mysql> show character set like 'utf%';+---------+---------------+-------------------+--------+| Charset | Description | Default collation | Maxlen |+---------+---------------+-------------------+--------+| utf8 | UTF-8 Unicode | utf8_general_ci | 3 |+---------+---------------+-------------------+--------+1 row in set (0.00 sec) |
Maxlen列用来说明存储这样的一个字符需要几个字节。如上例，存储一个gbk字符需要2个字节，存储一个utf8字符需要3个字符。
2.SHOW [FULL] COLUMNS {FROM | IN} tbl_name [{FROM | IN} db_name] [LIKE 'pattern']
用于显示所给表的列。这里感觉跟desc tbl_name的功能相同。
查询django数据库auth_group表结构
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | mysql> show columns from auth_group from django;+-------+-------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+-------+-------------+------+-----+---------+----------------+| id | int(11) | | PRI | NULL | auto_increment || name | varchar(80) | | UNI | | |+-------+-------------+------+-----+---------+----------------+2 rows in set (0.00 sec)mysql> show columns from django.auth_group;+-------+-------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+-------+-------------+------+-----+---------+----------------+| id | int(11) | | PRI | NULL | auto_increment || name | varchar(80) | | UNI | | |+-------+-------------+------+-----+---------+----------------+2 rows in set (0.00 sec)mysql> desc django.auth_group;+-------+-------------+------+-----+---------+----------------+| Field | Type | Null | Key | Default | Extra |+-------+-------------+------+-----+---------+----------------+| id | int(11) | | PRI | NULL | auto_increment || name | varchar(80) | | UNI | | |+-------+-------------+------+-----+---------+----------------+2 rows in set (0.00 sec) |
3.show create table tbl_name
显示创建表的sql语句。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | mysql> show create table auth_group;+------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| Table | Create Table |+------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+| auth_group | CREATE TABLE `auth_group` ( `id` int(11) NOT NULL auto_increment, `name` varchar(80) NOT NULL default '', PRIMARY KEY (`id`), UNIQUE KEY `name` (`name`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 |+------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+1 row in set (0.00 sec) |
4。show create database db_name
显示创建db_name时候的sql语句
5。show databases [like 'pattern']
显示当前mysql上所有的数据库
1 2 3 4 5 6 7 8 9 10 | mysql> show databases;+----------+| Database |+----------+| django || mysql || test || trac |+----------+4 rows in set (0.00 sec) |
6。show tables [like 'pattern']
显示当前数据库上的所有表
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | mysql> show tables;+----------------------------+| Tables_in_django |+----------------------------+| auth_group || auth_group_permissions || auth_message || auth_permission || auth_user || auth_user_groups || auth_user_user_permissions || django_content_type || django_session || django_site || polls_choice || polls_poll |+----------------------------+12 rows in set (0.00 sec) |
7.show grants [for user]
显示对user的授权语句
1 2 3 4 5 6 7 8 9 10 11 12 | mysql> show grants;+----------------------------------------------------------------------------------------------------------------------------------------+| Grants for root@localhost |+----------------------------------------------------------------------------------------------------------------------------------------+| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*A4B6157319038724E35608' WITH GRANT OPTION |+----------------------------------------------------------------------------------------------------------------------------------------+1 row in set (0.00 sec) |
8.SHOW {INDEX | INDEXES | KEYS} {FROM | IN} tbl_name [{FROM | IN} db_name]
显示索引
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | mysql> show index from auth_group;+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation |Cardinality | Sub_part | Packed | Null | Index_type | Comment |+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+| auth_group | 0 | PRIMARY | 1 | id | A | 0 | NULL | NULL | | BTREE | || auth_group | 0 | name | 1 | name | A | 0 | NULL | NULL | | BTREE | |+------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+2 rows in set (0.00 sec) |
9。show open table
显示当前表缓冲区中的表
1 2 3 4 5 6 7 | mysql> show open tables;+----------+------------+--------+-------------+| Database | Table | In_use | Name_locked |+----------+------------+--------+-------------+| django | auth_group | 0 | 0 |+----------+------------+--------+-------------+1 row in set (0.00 sec) |
10。SHOW PRIVILEGES
显示mysql所支持的权限
11。SHOW [FULL] PROCESSLIST
显示正在使用的线程(thread)
1 2 3 4 5 6 7 8 9 10 11 12 | mysql> show processlist;+----+------+----------------+--------+---------+------+-------+------------------+| Id | User | Host | db | Command | Time | State | Info |+----+------+----------------+--------+---------+------+-------+------------------+| 7 | root | localhost:1158 | django | Query | 0 | NULL | show processlist |+----+------+----------------+--------+---------+------+-------+------------------+1 row in set (0.00 sec) |
12.SHOW [GLOBAL | SESSION] VARIABLES [LIKE 'pattern']
显示变量
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | mysql> show variables like "%char%";+--------------------------+---------------------------------------------------------+| Variable_name | Value |+--------------------------+---------------------------------------------------------+| character_set_client | latin1 || character_set_connection | latin1 || character_set_database | utf8 || character_set_results | latin1 || character_set_server | utf8 || character_set_system | utf8 || character_sets_dir | D:\Program Files\MySQL\MySQL Server 4.1\share\charsets/ |+--------------------------+---------------------------------------------------------+7 rows in set (0.00 sec) |
13。SHOW WARNINGS [LIMIT [offset,] row_count]
SHOW COUNT(*) WARNINGS
显示当前session中最后的语句生产成的错误，警告灯信息
