mysql更改root密码,连接mysql，常用操作
mysql> show databases; +--------------------+| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
4 rows in set (0.00 sec)
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| event |
| func |
| time_zone |
| time_zone_leap_second |
+---------------------------+
28 rows in set (0.00 sec)
mysql> desc time_zone;
+------------------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------+------------------+------+-----+---------+----------------+
| Time_zone_id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| Use_leap_seconds | enum('Y','N') | NO | | N | |
+------------------+------------------+------+-----+---------+----------------+
2 rows in set (0.11 sec)
mysql> show create table time_zone\G;
#G=grep筛选文字内容，规律显示出来
*************************** 1. row ***************************
Table: time_zone
Create Table: CREATE TABLE `time_zone` (
`Time_zone_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`Use_leap_seconds` enum('Y','N') NOT NULL DEFAULT 'N',
PRIMARY KEY (`Time_zone_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='Time zones'
1 row in set (0.03 sec)
ERROR:
No query specified
mysql> select user();
+----------------+
| user() |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.07 sec)
mysql> select database();
+------------+
| database() |
+------------+
| mysql |
+------------+
1 row in set (0.00 sec)
mysql> select * from user\G;
创建库：
mysql> create database db1;
Query OK, 1 row affected (0.02 sec)
创建表：
mysql> use db1;
#先切换到指定库下
Database changed
mysql> create table t1(`id` int(4),`name` char(40)) ENGINE=InnoDB DEFAULT CHARSET=utf8;
#括号中是定义字段及字段格式，使用反引号引起来
Query OK, 0 rows affected (1.51 sec)
mysql> select version();
+-----------+
| version() |
+-----------+
| 5.6.35 |
+-----------+
1 row in set (0.06 sec)
mysql> show status;
+-----------------------------------------------+-------------+
| Variable_name | Value |
+-----------------------------------------------+-------------+
| Aborted_clients | 0 |
| Aborted_connects | 0 |
+-----------------------------------------------+-------------+
mysql> show variables\G;
mysql> show variables like 'max_connect%'\G;
#like表示匹配；%是通配符
更改参数：
mysql> set global max_connect_errors=110;
Query OK, 0 rows affected (0.04 sec)
#在此只是临时更改，如果要永久更改，需要编辑配置文件
查看队列：
mysql> show processlist;
+----+------+-----------+------+---------+------+-------+------------------+
|> +----+------+-----------+------+---------+------+-------+------------------+
|5 | root | localhost | db1| Query | 0 | init| show processlist |
+----+------+-----------+------+---------+------+-------+------------------+
1 row in set (0.01 sec)
mysql> drop table t1;
Query OK, 0 rows affected (0.32 sec)
mysql> drop database db1;
Query OK, 0 rows affected (0.10 sec)
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