MySQL常用操作
Win7登陆MySQL数据库进入目录:cd 安装目录\bin后,执行命令mysqld -install安装mysql服务,服务安装成功后,执行net start mysql命令启动Mysql服务。
输入:mysql -u root -p 密码:xxxx
这时报错pymysql.err.OperationalError: (1045, u"Access denied for user 'root'@'localhost' (using password: No)")
最简单的方法是更换了root密码的认证方式解决的,新版mysql使用的caching_sha2_password,换成mysql_native_password我就可以连上了。
步骤是在cmd命令行连接mysql, 通过mysql -u root -p
然后输入ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root456';
这时再跑下python脚本就可以连接了。
创建数据库:create database 数据库名;
删除数据库:drop database 数据库名;
查看所有数据库:show databases;
选择数据库:use 数据库名;
查看数据表:show tables;
查看数据表中所有的数据:select * from 表名;
查看数据表的表结构:descirbe 表名;
显示表中的列:show columns from 表名;
有条件地从表中选取数据,可将 where 子句添加到 select 语句中
例如:select * from runoob_tbl where runoob_author='菜鸟教程';
向表中插入数据:
1、insert into 表名(列名1,列名2,...) values("列值1","列值2",...);
2、insert into 表名 values("列值1","列值2",...);
限制查询结果(limit):
只查询前x条记录:select * from 表名 limit x;
查询从x条记录开始的第y条记录:
select * from 表名 limit x,y;
创建数据表:CREATE TABLE 数据表名 (column_name column_type);
删除数据表:DROP TABLE 数据表名;
数据表插入数据:INSERT INTO table_name ( field1, field2,...fieldN );
数据库中查询数据:SELECT * from table_name;
获取数据表结构:desc table_name;或show columns from table_name;
Linux下查看MySQL字符集
Linux系统下:
[hadoop@hadoop000 Desktop]$ mysql -uroot -proot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.73 Source distribution
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
1.通过mysql -uroot -proot登陆后
mysql> show variables like 'chara%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)
mysql>