Common operation commands of MySQL in Linux system

Serve:

# chkconfig --list List all system services
# chkconfig --list | grep on List all started system services

# chkconfig --list mysqld

# whereis mysql View the file installation path
# which mysql query runs the file path (folder address)
usr/bin/mysql means: the running path of mysql
var/lib/mysql refers to: the storage path of mysql database files
usr/lib/mysql refers to: the installation path of mysql

Add environment variables:

# vi /etc/profile
# export MYSQL_HOME=/usr/local/mysql
# export PATH=$PATH:$MYSQL_HOME/bin

1. Database instructions:

# service mysqld start Start MySQL
# service mysqld restart Restart MySQL
# service mysqld stop

2. Enter the MySQL form operation

# -u root -p /mysql -h localhost -u root -p DatabaseName; Enter MySQL
MySQL> show databases; List databases
MySQL> create database XXX; Create database XXX

MySQL> use databaseName; Use database databaseName
MySQL> show tables; List tables

MySQL> create table mytablename (ID int auto_increment not null primary key, usename varchar(20), password varchar(64), sex varchar(10), address varchar(20)); Create table
MySQL> drop table mytablename ; Delete table
MySQL> drop database databasename; Delete database

3. Add, delete, modify and check

MySQL> insert into mytablename values('','zhangsan','123456','fomale','guiyanag');

MySQL> select * from mytablename ; Find the verification result
MySQL> select * from mytablename where ID = '1'; Accurate search

MySQL> update mytablename set address = 'shanghai' where username = 'zhangsan'; Change zhangsan's address to shanghai

MySQL> delete from mytablename where ID = '1'; Delete records

Add universal user

grant select On database.* to username@localhost identity by 'password'


Username user_1 Password is 123456

You can log in as this user from any PC to operate the database

MySQL> grant select,insert update,delete on *.* to user_1@"%" identity by "123456";


Create a user who can only operate the database on this machine

Username user_2 Password is 123456

MySQL> grant select,insert update,delete on *.* to user_2@localhost identity by "123456";

Login database

MySQL> -u user_1 -p -h IP地址;


In addition, I list some commonly used commands for reference only:

Other MySQL database related operations are as follows

(1) Create a database TestDB mysql> create database TestDB;
(2) Set the TestDB database as the current default database mysql> use TestDB;
(3) Create the customers table in the TestDB database mysql> create table customers(userid int not null, username varchar(20) not null);
(4) Display the database listmysql> show databases;
(5) Display the tables in the database mysql> show tables;
(6) Delete the customers table mysql> drop table customers;
(7) Display the structure of the customers tablemysql> desc customers;
(8) Insert a record into the customers tablemysql> insert into customers(userid, username) values(1, 'hujiahui');
(9) Make the operation take effect immediately; mysql> commit;
(10) Query the records in customersmysql> select * from customers;
(11) Update data in the tablemysql> update customers set username='DennisHu' where userid=1;
(12) Delete records from the tablemysql> delete from customers;
(13) Grant the likui user the permission to access the database # grant select, insert, update, delete on *.* to likui@localhost indentified by "123456";