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  • MySql常用命令

    创建数据库:create database database_name;
    删除数据库:drop database database_name;
    使用数据库:use database_name;
    查看系统所支持的存储引擎类型:show engines;
    修改表名:alter table offices rename offices_new;
    修改字段的数据类型:alter table offices modify name varchar(30);
    修改字段名:alter table offices change city city_new varchar(30);
    添加字段:alter table offices add manager int(10);
    删除字段:alter table offices drop manager;
    删除表的外键约束:alter table offices drop foreign key office_fk;
    删除表:(若表被其他表关联,先删除外键约束,再删除表)drop table offices;
    删除表中数据:delete from offices;
     

    select h.id,h.hotel_id,hp.id,hp.hotel_id from hotel_supporting_service as h left join hotel_supporting_service_protocol as hp on hp.src_id = h.id where h.id>6;

    show create procedure sys.ps_setup_enable_background_threads;
    show procedure status like 'ps_setup_enable_background_threads';
    SELECT * FROM information_schema.ROUTINES WHERE ROUTINE_NAME='ps_setup_enable_background_threads';

    show triggers;

    ##select_priv, create_view_priv
    SELECT * FROM mysql.user WHERE user='root';
    select * from information_schema.VIEWS;
    select * from information_schema.TRIGGERS;
    SELECT @@AUTOCOMMIT;
    SELECT @@tx_isolation;

    select * from zcy_develop.vanyar_users where account='339900111111';
    select * from zcy_develop.vanyar_orgins_category where org_id = 100013315;
    select * from zcy_develop.vanyar_employee where user_id = 100018406;
    select * from zcy_develop.vanyar_user_extra where user_id = 100018406;

    delete from oauth_code;
    delete from oauth_access_token;
    select password("**jjhh");
    analyze table zcy_develop.vanyar_user_extra;
    select * from mysql.user;
    SHOW VARIABLES LIKE 'slow_query_log_file';
    SHOW STATUS LIKE 'slow_queries';

     
    批量删除table
    Select CONCAT( 'drop table ', table_name, ';' ) FROM information_schema.tables Where table_name LIKE 'hotel_%';
     
    mysql -P 3306 -h 127.0.0.1 -uroot -p123456
    create database zcy_develop default character set utf8 collate utf8_general_ci;
    use zcy_develop;
    source ~/Documents/zcy_develop.sql;
     
    mysqladmin -u root password "newpass"
    mysqladmin -u root password oldpass "newpass"
     
     
    show VARIABLES like '%max_allowed_packet%'

    所有大于16M的SQL文件都会报ERROR 2006 (HY000) at line 17128: MySQL server has gone away,我们可以登录MySQL客户端,修改系统变量:

    set GLOBAL max_allowed_packet=500*1024*1024;
    

    我们也可以通过修改MySQL配置my.cnf文件,在最后一行增加max_allowed_packet=500M就可以了

    MySQL配置文件的位置:

    • Windows下 C:ProgamDataMySQLMySQL Server5.6
    • Linux下 /etc/mysql
    • Mac下通过brew安装 /usr/local/Cellar/mysql/5.6.23
    1、在mysql 数据库中,“2009-09-15 00:00:00”转化为列为长整型的函数:
    select * from tb where createAt < unix_timestamp("2013-03-15 00:00:00")*1000,
    2、在mysql数据库中,“1252999488000”(java中的long型数据)转化为日期:
    select  * from tb where createAt <  from_unixtime(1252999488);
    【注】:要将最后三位去掉。
     
     
     
     
     
     

     

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  • 原文地址:https://www.cnblogs.com/wade-luffy/p/6103947.html
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