MySQL使用筆記

刪除修改

查詢元資料操作

表結構調整

許可權管理

字符集設定

資料匯入和匯出

匯入資料

遠端連線mysql

資料庫備份和複製

mysql 程序資訊

編碼集問題

insert into ticket_info (buyer_openid,ticket_date) 

values
('000751a016bdbf8eb40e7a902f7153c6','2017-12-01'),
('000751a016bdbf8eb40e7a902f7153c6','2017-12-01');

unique索引或primary key重複，無視本條執行語句，即不執行。

insert ignore into `table_name` (`email`, `phone`, `user_id`) 

values ('[email protected]', '99999', '9999');

unique索引或primary key重複，刪除舊記錄，插入新記錄，返回受影響的行（刪除和插入行數的和）。

replace into `table_name`(`col_name`, ...) values (...);

unique索引或primary key重複，則執行舊行update。

insert into table (a, b, c) values (1, 2, 3), (4, 5, 6) on duplicate key update c=values(a)+values(b);

delete from user where user='test';

update user set password='test' where host='11.11.11.11' and user='11';

show variables

show databases

show tables[from db_name]   

show tables like 'ticket%'

show create tables tbl_name

describe tablename
desc tablename
select columns from tablename
show full columns from tablename;

show index from tbl_name [from db_name]

alter table bulletin add citycode varchar(6) not null default 0;

alter table order_info  modify column order_status int(4) not null comment '我的描述';

alter table my_test_db change table_name_new table_name_old char(32) not null default '123';

alter table user drop column news;

create user 'user_name'@'11.11.11.11' identified by 'my_password';

flush privileges;

grant select on db.table to 'username'@'10.254.0.0/255.255.0.0' identified by '***';  

grant select, insert on db_name.table_name to 'user_name'@'10.11.11.11'; 
grant all on *.* to user_name@'10.11.11.11'
grant all on *.* to user_name@'10.11.%' identified by '***';

show grants for 'user_name'@'100.76.%';

revoke update,select,delete on db_name.*  from 'user_name'@'10.254.%';

我們建立使用者後，只是寫入了user表，但是並沒有及時寫入許可權表（grant table）。

執行 flush privileges命令，更新grant table，此時grant table裡有了我們剛插入的使用者，才能對它進行許可權修改：

flush privileges;

set names utf8;

show variables like「character_set_%

select * from user_info into outfile '/tmp/table.txt' character set utf8;

mysql -uroot -p123456 -e "select * from order_info" > /tmp/table.txt

mysql -uroot -p123456 -e "select * from order_info" > /tmp/table.xlsx

set names utf8;

load data local infile '/tmp/table.txt' into table user_info;

mysql -h 11.11.11.11 -p3306 -umyusernmae -pmypassword --default-character-set=utf8

mysqldump -h localhost -u root -p123456 guestbook > guestbook2-29.sql

create table mytbl_new like production.mytbl;

insert mytbl_new select * from production.mytbl;

show full processlist;

kill -9 id

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