[] Tortured soul you really know Mysql management and use of it?

Author | Jeskson

Source | Dada front-end bistro

MySQL management, database management and data table management, user management.

Initialize the database, creating a database, check the database, delete the database.

Create a data table to view the data table, modify data table, delete data table.

User management, creating and deleting users, granting user rights and recovery, user settings and change the password.

Database Management

Initialize the database

mysqld --initialize

Start the database:

Start using windows server management interface; or to start using the MySQL command.

mysql -u root -p

Create a database

CREATE DATABASEStatement to create a new database

CREATE DATABASE [db_name];

// 创建一个名为dada的数据库
create database data;

After the database is created, it will dataautomatically generate a directory named datadirectory, under the directory where the data will be stored in this database MySQLis a database management system that supports running multiple databases.

View database

SHOW DATABASES

show databases;

Delete Database

DROP DATABASE db_name;

drop database dada; // 删除dada数据库

Delete database is an irreversible operation.

MySQL data management table

MySQLEach database is equivalent to a container placed inside many many tables, the table contains a row for each particular data relationship information, a data record. In the datadirectory, each corresponding to a directory database.

Table 3 correspond to each data file, respectively, ".frm", "myd", ". Myi" type of file.

Create a data table:

USE 数据库名；
CREATE TABLE 表名（字段名 类型（长度），字段名 类型（长度））；

View Data Sheet

SHOW语句和DESCRIBE语句

// 查看数据库中有哪些表
SHOW TABLES;

// 此命令可以列出所有表名
show tables;

// DESCRIBE
DESCRIBE 库名.表名;
使用DESCRIBE语句可以查看某一个表的具体结构，并查看组成表的各字段的信息

use mysql;
describe user;

Use statement see the table describe each field name, type, length, if non-empty, if there is a primary key, default values, and notes and other information.

Modify Data Sheet

Modify data using the ALTER TABLE statement to implement, ALTER, modify a table, the table comprising a modified name, the field names, field types, etc. table structure.

Modify the table name

ALTER TABLE 旧表名 RENAME 新表名；

ALTER TABLE student RENAME student1;

Modify field names:

ALTER TABLE 表名 CHANGE 旧属性名 新属性名 新数据类型;

ALTER TABLE student1 CHANGE name s_name varchar(50);

Modify the field type

ALTER TABLE 表名 MODIFY 属性名 数据类型;

ALTER TABLE student1 MODIFY name varchar(2);

Increase the field:

ALTER TABLE 表名 ADD 属性名 数据类型;

ALTER TABLE student1 ADD sex char(1)

Delete field:

ALTER TABLE 表名 DROP 属性名;

ALTER TABLE student1 DROP sex;

Delete Data Sheet

USE 数据库名;
DROP 表名;

Use DROPstatement may delete database tables

DROP TABLE 数据库名.表名;

USE test;
DROP TABLE student1;

DROP TABLE test.sudent1;

mysqlUser Management

Create and delete user

Create a user

CREATE USER 'username'@'host' IDENTIFIED BY 'password';

usernameUser Name Table to create
hostrepresentation can log on which host

CREATE USER 'test1'@'localhost' IDENTIFIED BY '123';

CREATE USER 'test2'@'192.123.2.2' IDENTIFIED BY '12';

CREATE USER 'test3'@'%' IDENTIFIED BY '';
// identified

User deletes

DROP USER 'username'@'host';

The same syntax and delete user to create a user syntax

DROP USER 'test1'@'localhost';

Delete the local host database users

User rights granted and recycling

Users can authorize:

GRANT privileges ON dbname.tablename To 'username'@'host';

privilegesIt represents the operating authority to grant users

dbnameIt represents the database name

tablenameIt represents the data table name

usernameAnd hostrepresent the user name and login host

GRANT SELECT, INSERT ON mysql.test TO 'test1'@'%';

It represents an authorized user test1all login host all of the mysqldatabase testtable have selectand insertprivileges.

GRANT ALL ON *.* TO 'test2'@'localhost';

If you want to grant users the appropriate operating authority for all databases and tables, is available“*”表示，如“*.*”。

Recovery of user rights

REVOKE privileges ON databasenamme,tablename FROM 'username'@'host';

REVOKE SELECT ON *.* FROM 'test2'@'localhost';

Recycling user test2SELECT permission on all tables in all libraries in the local host database

Setup and change the user password

SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');;

usernameTo set or change the password for the user name

hostThe user's login host

newpasswordTo set or change the password

SET PASSWORD FOR 'test1'@'localhost' = PASSWORD('123');

❤️ Do not forget to leave your footprints learning [+ collection point Like Comments +]

Author Info:

[Author]: Jeskson
[original] Public number: Dada front-end bistro.
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