MariaDB的基础操作

1、创建数据库

MariaDB [(none)]> CRRATE DATABASE test1;    #创建一个名为test1的数据库MariaDB [(none)]> CRRATE DATABASE IF NOT EXISTS test2;    #创建一个名为test2的数据库MariaDB [(none)]> SHOW DATABASES;        #显示存在的数据库

2、删除数据库

MariaDB [(none)]> DROP DATABASE test1；     #删除名为test1的数据库MariaDB [(none)]> DROP DATABASE IF EXISTS test1；

3、创建表

格式：CREAT TABLE tb_name(col1,col2,col3,...);

MariaDB [(none)]> CREATE TABLE test2.teacher(Name CHAR(20) NOT NULL,Age TINYINT UNSIGNED,Gender CHAR(1) NOT NULL);     #在数据库test2中创建表teacherMariaDB [(none)]> USE test2;MariaDB [(test2)]> CREATE TABLE student(Name CHAR(20) NOT NULL,Age TINYINT UNSIGNED,Gender CHAR(1) NOT NULL);         #另一种方式在数据库test2中创建表studentMariaDB [(test2)]> SHOW TABLES FROM test2；         #查看数据库test2中的表

4、查看表结构

MariaDB [(test2)]> DESCRIPTION student；MariaDB [(test2)]> DESC teacher；         #DESCRIPTION可缩写为DESC

5、删除表

MariaDB [(test2)]> DROP TABLE teacher;MariaDB [(test2)]> DROP TABLE IF EXISTS teacher;

6、修改表

MariaDB [(test2)]> ALTER TABLE student ADD course VARCHAR(80);        #添加一个字段courseMariaDB [(test2)]> DESC student；MariaDB [(test2)]> ALTER TABLE student CHANGE course Course VARCHAR(80) AFTER Name；     #修改course为Course，并放在Name后MariaDB [(test2)]> DESC student；

7、插入数据信息

MariaDB [(test2)]> INSERT INTO student (Name，Gender) VALUE ('Tom','M'),('Jerry','F');MariaDB [(test2)]> SELECT * FROM student;MariaDB [(test2)]> INSERT INTO student VALUE ('Jack','Math',16,'M');

8、修改更新数据信息

MariaDB [(test2)]> UPDATE student SET Course='Physics' WHERE Name='Tom';    #向名为Tom的行的Course字段插入PhysicsMariaDB [(test2)]> SELECT Name,Course FROM student WHERE Course='Physics';     #选择student表中课程为物理的Name与CourseMariaDB [(test2)]> DELETE FROM student WHERE Coures='Physics';             #删除课程为物理的所有行

9、创建、删除用户

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

DROP USER 'username'@'host';

MariaDB [(none)]> CREATE USER 'Lucy'@'localhost' INDENTIFIED BY '123456';MariaDB [(none)]> SHOW GRANTS FOR 'Lucy'@'localhost';            #查看用户的授权MariaDB [(none)]> CREATE USER 'Lily'@'192.168.1.50'MariaDB [(none)]> CREATE USER 'Bob'@'%'                 #其中%为通配符，表示任意多的字符，下划线_表示任意单个字符

10、授权

GRANT pri1,pri2,pri3,... ON dbname.tbname TO 'username'@'host' [IDENTIFIED BY 'password'];

REVOKE pri1,pri2,pri3,... ON dbname.tbname FROM 'username'@'host'; #取消权限

MariaDB [(none)]> GRANT ALL PRIVILEGES ON test2.* TO 'Lucy'@'%';             #授与用户'Lucy'@'%'在test2库所有表的全部的权限MariaDB [(none)]> SHOW GRANTS FOR 'Lucy'@'%';