MySQL 数据库常用命令
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http://www.cnblogs.com/northeastTycoon/p/5504161.html
1. 查看当前用户 mysql> select user(); # 查询当前用户命令语句
+----------------+
| user() |
+----------------+
| dbdh@localhost |
+----------------+
1 row in set (0.00 sec)
2. 查看所有用户信息操作
mysql> select user,password,host from mysql.user;
+------+-------------------------------------------+-----------+
| user | password | host |
+------+-------------------------------------------+-----------+
| root | *2E91CB3102EF6B7544F608943E5F0345EA4B1B6E | localhost |
| root | *2E91CB3102EF6B7544F608943E5F0345EA4B1B6E | 127.0.0.1 |
| root | *2E91CB3102EF6B7544F608943E5F0345EA4B1B6E | ::1 |
| dbdh | *2E91CB3102EF6B7544F608943E5F0345EA4B1B6E | 127.0.0.1 |
| dbdh | *2E91CB3102EF6B7544F608943E5F0345EA4B1B6E | localhost |
+------+-------------------------------------------+-----------+
5 rows in set (0.00 sec)
3. 查询当前的数据库版本信息
mysql> select @@version;
+------------+
| @@version |
+------------+
| 5.6.22-log |
+------------+
1 row in set (0.00 sec)
4. 查询数据库是否启动log_bin
mysql> show variables like '%log_bin%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| log_bin | OFF |
| log_bin_basename | |
| log_bin_index | |
| log_bin_trust_function_creators | OFF |
| log_bin_use_v1_row_events | OFF |
| sql_log_bin | ON |
+---------------------------------+-------+
6 rows in set (0.00 sec)
5. 查询当前支持的字符集
mysql> show character set;
+----------+-----------------------------+---------------------+--------+
| Charset | Description | Default collation | Maxlen |
+----------+-----------------------------+---------------------+--------+
| big5 | Big5 Traditional Chinese | big5_chinese_ci | 2 |
| dec8 | DEC West European | dec8_swedish_ci | 1 |
| cp850 | DOS West European | cp850_general_ci | 1 |
| hp8 | HP West European | hp8_english_ci | 1 |
| koi8r | KOI8-R Relcom Russian | koi8r_general_ci | 1 |
| latin1 | cp1252 West European | latin1_swedish_ci | 1 |
| latin2 | ISO 8859-2 Central European | latin2_general_ci | 1 |
| swe7 | 7bit Swedish | swe7_swedish_ci | 1 |
| ascii | US ASCII | ascii_general_ci | 1 |
| ujis | EUC-JP Japanese | ujis_japanese_ci | 3 |
| sjis | Shift-JIS Japanese | sjis_japanese_ci | 2 |
| hebrew | ISO 8859-8 Hebrew | hebrew_general_ci | 1 |
| tis620 | TIS620 Thai | tis620_thai_ci | 1 |
| euckr | EUC-KR Korean | euckr_korean_ci | 2 |
| koi8u | KOI8-U Ukrainian | koi8u_general_ci | 1 |
| gb2312 | GB2312 Simplified Chinese | gb2312_chinese_ci | 2 |
| greek | ISO 8859-7 Greek | greek_general_ci | 1 |
| cp1250 | Windows Central European | cp1250_general_ci | 1 |
| gbk | GBK Simplified Chinese | gbk_chinese_ci | 2 |
| latin5 | ISO 8859-9 Turkish | latin5_turkish_ci | 1 |
| armscii8 | ARMSCII-8 Armenian | armscii8_general_ci | 1 |
| utf8 | UTF-8 Unicode | utf8_general_ci | 3 |
| ucs2 | UCS-2 Unicode | ucs2_general_ci | 2 |
| cp866 | DOS Russian | cp866_general_ci | 1 |
| keybcs2 | DOS Kamenicky Czech-Slovak | keybcs2_general_ci | 1 |
| macce | Mac Central European | macce_general_ci | 1 |
| macroman | Mac West European | macroman_general_ci | 1 |
| cp852 | DOS Central European | cp852_general_ci | 1 |
| latin7 | ISO 8859-13 Baltic | latin7_general_ci | 1 |
| utf8mb4 | UTF-8 Unicode | utf8mb4_general_ci | 4 |
| cp1251 | Windows Cyrillic | cp1251_general_ci | 1 |
| utf16 | UTF-16 Unicode | utf16_general_ci | 4 |
| utf16le | UTF-16LE Unicode | utf16le_general_ci | 4 |
| cp1256 | Windows Arabic | cp1256_general_ci | 1 |
| cp1257 | Windows Baltic | cp1257_general_ci | 1 |
| utf32 | UTF-32 Unicode | utf32_general_ci | 4 |
| binary | Binary pseudo charset | binary | 1 |
| geostd8 | GEOSTD8 Georgian | geostd8_general_ci | 1 |
| cp932 | SJIS for Windows Japanese | cp932_japanese_ci | 2 |
| eucjpms | UJIS for Windows Japanese | eucjpms_japanese_ci | 3 |
+----------+-----------------------------+---------------------+--------+
40 rows in set (0.00 sec)
mysql> show variables like '%char%';
+--------------------------+----------------------------------------------------
-----+
| Variable_name | Value
|
+--------------------------+----------------------------------------------------
-----+
| character_set_client | gbk
|
| character_set_connection | gbk
|
| character_set_database | utf8
|
| character_set_filesystem | binary
|
| character_set_results | gbk
|
| character_set_server | utf8
|
| character_set_system | utf8
|
| character_sets_dir | C:\Program Files\MySQL\MySQL Server 5.6\share\chars
ets\ |
+--------------------------+----------------------------------------------------
-----+
8 rows in set (0.00 sec)
6. 查询一个数据库字符集及库中某一个表字符集
mysql> show create database test; #库的字符集
+----------+---------------------------------------------------------------+
| Database | Create Database |
+----------+---------------------------------------------------------------+
| test | CREATE DATABASE `test` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+---------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> show create table test.t1\G; #test库中t1表中的字符集
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(3) DEFAULT '0',
`age` int(3) DEFAULT NULL,
`name` varchar(20) DEFAULT NULL,
`school` varchar(30) DEFAULT 'null'
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
7. 查找日志文件文件:
mysql> show variables like '%dir%';
8. 修改字符集操作
mysql> alter database test character set utf8;
Query OK, 1 row affected (0.00 sec)
9. 连接mysql 数据库命令语句如下
mysql -h localhost | hostIP -u username -ppassword -D
10. 查询当前所有的数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| qfclear |
| sakila |
| test |
| train |
| world |
+--------------------+
8 rows in set (0.00 sec)
11. 如果想使用某一个数据可以使用命令如下:
mysql>use databasename;
