python中mysql常用用法

发布时间:2019-07-22 09:57:32编辑:auto阅读(1296)

    查看

    查看变量 show variables like 'auto%';
    信息输出: echo "select user,host,password from mysql.user" |mysql -uroot -plingxiangxiang
    查看库 show databases;
    查看都有哪些库 show databases;
    查看某个库的表 use db; show tables \G;
    查看表的字段 desc tb;
    查看建表语句 show create table tb;
    当前是哪个用户 select user();
    当前库 select database();
    查看数据库版本 select version();
    查看mysql状态 show status;
    查看mysql队列 show processlist;
    查询 select count() from mysql.user; select from mysql.db; select * from mysql.db where host like '10.0.%';
    查看权限 show grants for root@'localhost';

    select from sutdent where group by stdname a, c where a.id = c.组id group by 字段:字段进行分组
    select
    from information_schema.processlist where info is not null;
    查看表索引 show index from 表名

    增加

    创建库 create database db1;
    创建表 create table t1 (id int, name char(40) adress varchar(30));
    创建普通用户并授权 grant all on . to databases1.user1 identified by '123456';
    grant all on db1. to 'user2'@'10.0.2.100' identified by '111222';
    grant all on db1.
    to 'user3'@'%' identified by '231222';insert into tb1 (id,name) values(1,'aming');
    插入 update db1.t1 set name='aaa' where id=1;
    创建索引 create index 库名_表名_列名1_列名2 (列名1, 列名2)

    删除

    删除表 drop table db1.t1; 删除表数据,表结构
    删除数据库 drop database db1;
    delete from table where 条件判断 删除行数据
    char(10) 'aaa '定长,给10个字符,只写了3个,其他7个用空格占用
    varchar(10) 'aaa' '变长'

    修改

    修改mysql参数 show variables like 'max_connect%'; set global max_connect_errors = 1000;
    更改密码 UPDATE mysql.user SET password=PASSWORD("newpwd") WHERE user='username' ;
    清空表 truncate table db1.t1; 只删除表数据,不删除表结构
    修复表 repair table tb1 [use frm];

    授权超级用户(对所有库所有表有权限,还可以给其他用户设置权限):
    grant all privileges on . to 'tangnanbing'@'%' identified by '1qaz@WSX' with grant option;

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