MySQL终端管理数据库操作指南
时间:2015-03-03 18:05 来源:www.it.net.cn 作者:IT网
MySQL有很多的可视化管理工具,比如“mysql-workbench”和“sequel-pro-”。 现在我写MySQL的终端命令操作的文章,是想强化一下自己对于MySQL的理解,总会比使用图形化的理解透彻,因为我本来就比较喜欢写代码。同时写出来这些文章,是想要给大家当个参考,希望也能对大家有所帮助,有所提升,这就是我为什么要写终端操作MySQL的文章了。
注意:MySQL数据库命令不区分大小写。但在MAC的终端,如果你想使用tab自动补全命令,那么你就必须使用大写,这样MAC的终端才会帮你补全命令,否则你按N遍tab都不会有响应。
1、数据库(database)管理
1.1 create 创建数据库
create database firstDB;
1.2 show 查看所有数据库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| firstDB |
| mysql |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)
1.3 alter 修改数据库
alter 命令修改数据库编码:
默认创建的数据库默认不支持中文字符,如果我们需要它支持中文字符,则将它的编码设置为utf8格式:
mysql> ALTER DATABASE testDB CHARACTER SET UTF8;
Query OK, 1 row affected (0.00 sec)
1.4 use 使用数据库
mysql> use firstDB;
Database changed
1.5 查看当前使用的数据库
mysql> select database();
+------------+
| database() |
+------------+
| firstdb |
+------------+
1 row in set (0.00 sec)
1.6 drop 删除数据库
mysql> drop database firstDB;
Query OK, 0 rows affected (0.00 sec)
2、数据表(table)管理
我们首先创建一个数据库,提供我们往后的使用:
mysql> create database testDB;
Query OK, 1 row affected (0.00 sec)
创建后记得用use命令进入(使用)数据库,不然后面的操作都会不成功的。
2.1 create 创建表
mysql> create table PEOPLE (
-> ID int AUTO_INCREMENT PRIMARY KEY,
-> NAME varchar(20) not null,
-> AGE int not null,
-> BIRTHDAY datetime);
Query OK, 0 rows affected (0.01 sec)
2.2 show 显示表
显示当前数据库所有的数据表
mysql> show tables;
+------------------+
| Tables_in_testdb |
+------------------+
| PEOPLE |
+------------------+
1 row in set (0.00 sec)
2.3 desc 查看表结构
mysql> desc PEOPLE
-> ;
+----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+----------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| NAME | varchar(20) | NO | | NULL | |
| AGE | int(11) | NO | | NULL | |
| BIRTHDAY | datetime | YES | | NULL | |
+----------+-------------+------+-----+---------+----------------+
4 rows in set (0.01 sec)
2.4 alter 修改表结构(增、删、改)
默认创建的表不支持中文字符,所以需将表编码设置为utf8:
mysql> ALTER TABLE KEYCHAIN CONVERT TO CHARACTER SET UTF8;
Query OK, 1 row affected (0.02 sec)
Records: 1 Duplicates: 0 Warnings: 0
2.4.1 insert 在表中添加列(字段)
mysql> alter table PEOPLE add star BOOL;
Query OK, 0 rows affected (0.02 sec)
Records: 0 Duplicates: 0 Warnings: 0
提示:在MySQL里,布尔类型会自动转换为tinyint(1)类型。
我们不妨使用desc去查看一下PEOPLE表结构:
mysql> desc PEOPLE;
+----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+----------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| NAME | varchar(20) | NO | | NULL | |
| AGE | int(11) | NO | | NULL | |
| BIRTHDAY | datetime | YES | | NULL | |
| star | tinyint(1) | YES | | NULL | |
+----------+-------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
现在,你该相信我了吧?
2.4.2 alter 修改表(列)字段
mysql> alter table PEOPLE MODIFY star int;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
我们再次使用desc查看PEOPLE表结构:
mysql> desc PEOPLE;
+----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+----------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| NAME | varchar(20) | NO | | NULL | |
| AGE | int(11) | NO | | NULL | |
| BIRTHDAY | datetime | YES | | NULL | |
| star | int(11) | YES | | NULL | |
+----------+-------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
2.4.3 delete 删除表(列)字段
mysql> alter table PEOPLE DROP column star;
Query OK, 0 rows affected (0.02 sec)
Records: 0 Duplicates: 0 Warnings: 0
删除后,再次查看PEOPLE表结构:
mysql> desc PEOPLE;
+----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+----------------+
| ID | int(11) | NO | PRI | NULL | auto_increment |
| NAME | varchar(20) | NO | | NULL | |
| AGE | int(11) | NO | | NULL | |
| BIRTHDAY | datetime | YES | | NULL | |
+----------+-------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
删除字段成功,现在我们已经不能看到star的字段了。
2.4.4 rename 重命名表名
mysql> RENAME TABLE PEOPLE TO NEW_PEOPLE;
Query OK, 0 rows affected (0.00 sec)
2.5 create 利用已有数据创建新表
mysql> create table newTable select * from PEOPLE;
Query OK, 0 rows affected (0.01 sec)
Records: 0 Duplicates: 0 Warnings: 0
我们查看一下目前数据库存在的表:
mysql> show tables;
+------------------+
| Tables_in_testdb |
+------------------+
| PEOPLE |
| newTable |
+------------------+
2 rows in set (0.00 sec)
3、数据的操作及管理
数据表的基本操作,包含增、删、改、查数据。
以下命令均在PEOPLE表上操作。
3.1 增加数据(增)
PEOPLE表目前是没有数据的,它是空的数据表,我们现在先添加一些数据。
insert into 命令添加数据:
mysql> insert into PEOPLE VALUES (null, 'Anny', 22, '1992-05-22');
Query OK, 1 row affected (0.00 sec)
使用select命令查看表(会在后面介绍),现在我们查看PEOPLE数据表的数据:
mysql> select * from PEOPLE;
+----+------+-----+---------------------+
| ID | NAME | AGE | BIRTHDAY |
+----+------+-----+---------------------+
| 1 | Anny | 22 | 1992-05-22 00:00:00 |
+----+------+-----+---------------------+
1 row in set (0.00 sec)
数据表现在有一条数据。
我们多添加几条数据,如:
mysql> select * from PEOPLE;
+----+--------+-----+---------------------+
| ID | NAME | AGE | BIRTHDAY |
+----+--------+-----+---------------------+
| 1 | Anny | 22 | 1992-05-22 00:00:00 |
| 2 | Garvey | 23 | 1991-05-22 00:00:00 |
| 3 | Lisa | 25 | 1989-05-22 00:00:00 |
| 4 | Nick | 24 | 1990-05-22 00:00:00 |
| 5 | Rick | 24 | 1991-05-22 00:00:00 |
+----+--------+-----+---------------------+
5 rows in set (0.00 sec)
3.2 删除数据(删)
delete 命令删除数据:
mysql> delete from PEOPLE where name = 'Lisa';
Query OK, 1 row affected (0.01 sec)
再次查询PEOPLE表:
mysql> select * from PEOPLE;
+----+--------+-----+---------------------+
| ID | NAME | AGE | BIRTHDAY |
+----+--------+-----+---------------------+
| 1 | Anny | 22 | 1992-05-22 00:00:00 |
| 2 | Garvey | 23 | 1991-05-22 00:00:00 |
| 4 | Nick | 24 | 1990-05-22 00:00:00 |
| 5 | Rick | 24 | 1991-05-22 00:00:00 |
+----+--------+-----+---------------------+
4 rows in set (0.00 sec)
已经看不到名为“Lisa”的数据了。
3.3 修改数据(改)
update 命令修改数据:
mysql> update PEOPLE set name='Calvin' where name = 'Garvey';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
查询PEOPLE表内容:
mysql> select * from PEOPLE;
+----+--------+-----+---------------------+
| ID | NAME | AGE | BIRTHDAY |
+----+--------+-----+---------------------+
| 1 | Anny | 22 | 1992-05-22 00:00:00 |
| 2 | Calvin | 23 | 1991-05-22 00:00:00 |
| 4 | Nick | 24 | 1990-05-22 00:00:00 |
| 5 | Rick | 24 | 1991-05-22 00:00:00 |
+----+--------+-----+---------------------+
4 rows in set (0.00 sec)
名为“Garvey”的记录已经修改为“Calvin”。
3.4 查询数据(查)
select 命令查询数据,最简单的就是查询表的所有数据,也就是我们最初使用到的那条命令:
mysql> select * from PEOPLE;
+----+--------+-----+---------------------+
| ID | NAME | AGE | BIRTHDAY |
+----+--------+-----+---------------------+
| 1 | Anny | 22 | 1992-05-22 00:00:00 |
| 2 | Calvin | 23 | 1991-05-22 00:00:00 |
| 4 | Nick | 24 | 1990-05-22 00:00:00 |
| 5 | Rick | 24 | 1991-05-22 00:00:00 |
+----+--------+-----+---------------------+
4 rows in set (0.00 sec)
格式:select * from <表名>,*代表所有字段。
查询数据时也可指定显示的(列)字段:
mysql> select NAME, AGE, BIRTHDAY from PEOPLE;
+--------+-----+---------------------+
| NAME | AGE | BIRTHDAY |
+--------+-----+---------------------+
| Anny | 22 | 1992-05-22 00:00:00 |
| Calvin | 23 | 1991-05-22 00:00:00 |
| Nick | 24 | 1990-05-22 00:00:00 |
| Rick | 24 | 1991-05-22 00:00:00 |
+--------+-----+---------------------+
4 rows in set (0.00 sec)
格式:select <字段名,字段名,…> from <表名>。
select查询命令还有很多的高级用法,比如用来查找不重复(distinct)的数据,使数据按条件排序(order by),按查询条件显示数据(where)等等。
(责任编辑:IT)
MySQL有很多的可视化管理工具,比如“mysql-workbench”和“sequel-pro-”。 现在我写MySQL的终端命令操作的文章,是想强化一下自己对于MySQL的理解,总会比使用图形化的理解透彻,因为我本来就比较喜欢写代码。同时写出来这些文章,是想要给大家当个参考,希望也能对大家有所帮助,有所提升,这就是我为什么要写终端操作MySQL的文章了。
注意:MySQL数据库命令不区分大小写。但在MAC的终端,如果你想使用tab自动补全命令,那么你就必须使用大写,这样MAC的终端才会帮你补全命令,否则你按N遍tab都不会有响应。 1、数据库(database)管理1.1 create 创建数据库 create database firstDB; 1.2 show 查看所有数据库 mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | firstDB | | mysql | | performance_schema | +--------------------+ 4 rows in set (0.00 sec) 1.3 alter 修改数据库 alter 命令修改数据库编码: 默认创建的数据库默认不支持中文字符,如果我们需要它支持中文字符,则将它的编码设置为utf8格式: mysql> ALTER DATABASE testDB CHARACTER SET UTF8; Query OK, 1 row affected (0.00 sec) 1.4 use 使用数据库 mysql> use firstDB; Database changed 1.5 查看当前使用的数据库 mysql> select database(); +------------+ | database() | +------------+ | firstdb | +------------+ 1 row in set (0.00 sec) 1.6 drop 删除数据库 mysql> drop database firstDB; Query OK, 0 rows affected (0.00 sec) 2、数据表(table)管理我们首先创建一个数据库,提供我们往后的使用: mysql> create database testDB; Query OK, 1 row affected (0.00 sec) 创建后记得用use命令进入(使用)数据库,不然后面的操作都会不成功的。 2.1 create 创建表 mysql> create table PEOPLE ( -> ID int AUTO_INCREMENT PRIMARY KEY, -> NAME varchar(20) not null, -> AGE int not null, -> BIRTHDAY datetime); Query OK, 0 rows affected (0.01 sec) 2.2 show 显示表 显示当前数据库所有的数据表 mysql> show tables; +------------------+ | Tables_in_testdb | +------------------+ | PEOPLE | +------------------+ 1 row in set (0.00 sec) 2.3 desc 查看表结构 mysql> desc PEOPLE -> ; +----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+----------------+ | ID | int(11) | NO | PRI | NULL | auto_increment | | NAME | varchar(20) | NO | | NULL | | | AGE | int(11) | NO | | NULL | | | BIRTHDAY | datetime | YES | | NULL | | +----------+-------------+------+-----+---------+----------------+ 4 rows in set (0.01 sec) 2.4 alter 修改表结构(增、删、改) 默认创建的表不支持中文字符,所以需将表编码设置为utf8: mysql> ALTER TABLE KEYCHAIN CONVERT TO CHARACTER SET UTF8; Query OK, 1 row affected (0.02 sec) Records: 1 Duplicates: 0 Warnings: 0 2.4.1 insert 在表中添加列(字段) mysql> alter table PEOPLE add star BOOL; Query OK, 0 rows affected (0.02 sec) Records: 0 Duplicates: 0 Warnings: 0 提示:在MySQL里,布尔类型会自动转换为tinyint(1)类型。 我们不妨使用desc去查看一下PEOPLE表结构: mysql> desc PEOPLE; +----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+----------------+ | ID | int(11) | NO | PRI | NULL | auto_increment | | NAME | varchar(20) | NO | | NULL | | | AGE | int(11) | NO | | NULL | | | BIRTHDAY | datetime | YES | | NULL | | | star | tinyint(1) | YES | | NULL | | +----------+-------------+------+-----+---------+----------------+ 5 rows in set (0.00 sec) 现在,你该相信我了吧? 2.4.2 alter 修改表(列)字段 mysql> alter table PEOPLE MODIFY star int; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 我们再次使用desc查看PEOPLE表结构: mysql> desc PEOPLE; +----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+----------------+ | ID | int(11) | NO | PRI | NULL | auto_increment | | NAME | varchar(20) | NO | | NULL | | | AGE | int(11) | NO | | NULL | | | BIRTHDAY | datetime | YES | | NULL | | | star | int(11) | YES | | NULL | | +----------+-------------+------+-----+---------+----------------+ 5 rows in set (0.00 sec) 2.4.3 delete 删除表(列)字段 mysql> alter table PEOPLE DROP column star; Query OK, 0 rows affected (0.02 sec) Records: 0 Duplicates: 0 Warnings: 0 删除后,再次查看PEOPLE表结构: mysql> desc PEOPLE; +----------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+----------------+ | ID | int(11) | NO | PRI | NULL | auto_increment | | NAME | varchar(20) | NO | | NULL | | | AGE | int(11) | NO | | NULL | | | BIRTHDAY | datetime | YES | | NULL | | +----------+-------------+------+-----+---------+----------------+ 4 rows in set (0.00 sec) 删除字段成功,现在我们已经不能看到star的字段了。 2.4.4 rename 重命名表名 mysql> RENAME TABLE PEOPLE TO NEW_PEOPLE; Query OK, 0 rows affected (0.00 sec) 2.5 create 利用已有数据创建新表 mysql> create table newTable select * from PEOPLE; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 我们查看一下目前数据库存在的表: mysql> show tables; +------------------+ | Tables_in_testdb | +------------------+ | PEOPLE | | newTable | +------------------+ 2 rows in set (0.00 sec) 3、数据的操作及管理数据表的基本操作,包含增、删、改、查数据。 以下命令均在PEOPLE表上操作。 3.1 增加数据(增) PEOPLE表目前是没有数据的,它是空的数据表,我们现在先添加一些数据。 insert into 命令添加数据: mysql> insert into PEOPLE VALUES (null, 'Anny', 22, '1992-05-22'); Query OK, 1 row affected (0.00 sec) 使用select命令查看表(会在后面介绍),现在我们查看PEOPLE数据表的数据: mysql> select * from PEOPLE; +----+------+-----+---------------------+ | ID | NAME | AGE | BIRTHDAY | +----+------+-----+---------------------+ | 1 | Anny | 22 | 1992-05-22 00:00:00 | +----+------+-----+---------------------+ 1 row in set (0.00 sec) 数据表现在有一条数据。 我们多添加几条数据,如: mysql> select * from PEOPLE; +----+--------+-----+---------------------+ | ID | NAME | AGE | BIRTHDAY | +----+--------+-----+---------------------+ | 1 | Anny | 22 | 1992-05-22 00:00:00 | | 2 | Garvey | 23 | 1991-05-22 00:00:00 | | 3 | Lisa | 25 | 1989-05-22 00:00:00 | | 4 | Nick | 24 | 1990-05-22 00:00:00 | | 5 | Rick | 24 | 1991-05-22 00:00:00 | +----+--------+-----+---------------------+ 5 rows in set (0.00 sec) 3.2 删除数据(删) delete 命令删除数据: mysql> delete from PEOPLE where name = 'Lisa'; Query OK, 1 row affected (0.01 sec) 再次查询PEOPLE表: mysql> select * from PEOPLE; +----+--------+-----+---------------------+ | ID | NAME | AGE | BIRTHDAY | +----+--------+-----+---------------------+ | 1 | Anny | 22 | 1992-05-22 00:00:00 | | 2 | Garvey | 23 | 1991-05-22 00:00:00 | | 4 | Nick | 24 | 1990-05-22 00:00:00 | | 5 | Rick | 24 | 1991-05-22 00:00:00 | +----+--------+-----+---------------------+ 4 rows in set (0.00 sec) 已经看不到名为“Lisa”的数据了。 3.3 修改数据(改) update 命令修改数据: mysql> update PEOPLE set name='Calvin' where name = 'Garvey'; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 查询PEOPLE表内容: mysql> select * from PEOPLE; +----+--------+-----+---------------------+ | ID | NAME | AGE | BIRTHDAY | +----+--------+-----+---------------------+ | 1 | Anny | 22 | 1992-05-22 00:00:00 | | 2 | Calvin | 23 | 1991-05-22 00:00:00 | | 4 | Nick | 24 | 1990-05-22 00:00:00 | | 5 | Rick | 24 | 1991-05-22 00:00:00 | +----+--------+-----+---------------------+ 4 rows in set (0.00 sec) 名为“Garvey”的记录已经修改为“Calvin”。 3.4 查询数据(查) select 命令查询数据,最简单的就是查询表的所有数据,也就是我们最初使用到的那条命令: mysql> select * from PEOPLE; +----+--------+-----+---------------------+ | ID | NAME | AGE | BIRTHDAY | +----+--------+-----+---------------------+ | 1 | Anny | 22 | 1992-05-22 00:00:00 | | 2 | Calvin | 23 | 1991-05-22 00:00:00 | | 4 | Nick | 24 | 1990-05-22 00:00:00 | | 5 | Rick | 24 | 1991-05-22 00:00:00 | +----+--------+-----+---------------------+ 4 rows in set (0.00 sec) 格式:select * from <表名>,*代表所有字段。 查询数据时也可指定显示的(列)字段: mysql> select NAME, AGE, BIRTHDAY from PEOPLE; +--------+-----+---------------------+ | NAME | AGE | BIRTHDAY | +--------+-----+---------------------+ | Anny | 22 | 1992-05-22 00:00:00 | | Calvin | 23 | 1991-05-22 00:00:00 | | Nick | 24 | 1990-05-22 00:00:00 | | Rick | 24 | 1991-05-22 00:00:00 | +--------+-----+---------------------+ 4 rows in set (0.00 sec) 格式:select <字段名,字段名,…> from <表名>。
select查询命令还有很多的高级用法,比如用来查找不重复(distinct)的数据,使数据按条件排序(order by),按查询条件显示数据(where)等等。 |