MariaDB 插入&更新&删除数据(8)
存储在系统中的数据是数据库管理系统(DBMS)的核心,数据库被设计用来管理数据的存储、访问和维护数据的完整性,MariaDB中提供了功能丰富的数据库管理语句,包括有效地向数据库中插入数据的INSERT语句,更新数据的UPDATE语句以及当数据不再使用时删除数据的DELETE语句,本小结将依次来介绍这些命令的使用方法和技巧.
MariaDB 插入数据
MariaDB中使用INSERT语句插入数据,可以插入的方式有:插入完整记录,插入记录的部分,插入多条记录,插入另一个查询的结果,废话不多说,老样子先来看一下插入语句的写法吧:
INSERT INTO 表名称(字段1,字段2,字段3,.....) VALUES(数值1,数值2,数值3....)
为了方便后续的练习,我们先来创建一个表结构,SQL语句如下:
MariaDB [lyshark]> create table person
-> (
-> id int unsigned not null auto_increment,
-> name char(50) not null default '',
-> age int not null default 0,
-> info char(50) null,
-> primary key(id)
-> );
Query OK, 0 rows affected (0.00 sec)
◆在所有字段插入数据◆
在person表中,插入一条新记录id=1,name=LyShark,age=22,info=Lawyer,SQL语句如下:
MariaDB [lyshark]> select * from person;
Empty set (0.00 sec)
MariaDB [lyshark]> insert into person(id,name,age,info) values(1,'LyShark',22,'Lawyer');
Query OK, 1 row affected (0.00 sec)
MariaDB [lyshark]> select * from person;
+----+---------+-----+--------+
| id | name | age | info |
+----+---------+-----+--------+
| 1 | LyShark | 22 | Lawyer |
+----+---------+-----+--------+
1 row in set (0.00 sec)
MariaDB [lyshark]>
◆在指定字段插入数据◆
在person表中,插入一条新记录,name=Willam,age=18,info=sports,我们不给其指定ID,SQL语句如下:
MariaDB [lyshark]> desc person;
+-------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| name | char(50) | NO | | | |
| age | int(11) | NO | | 0 | |
| info | char(50) | YES | | NULL | |
+-------+------------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)
MariaDB [lyshark]> insert into person(name,age,info) values('Willam',18,'sports man');
Query OK, 1 row affected (0.04 sec)
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
+----+---------+-----+------------+
2 rows in set (0.00 sec)
MariaDB [lyshark]>
◆同时为表插入多条记录◆
在person表中,同时插入3条新记录,有多条只需要在每一条的后面加,即可,SQL语句如下:
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
+----+---------+-----+------------+
2 rows in set (0.00 sec)
MariaDB [lyshark]> insert into person(name,age,info) values('Evans',27,'secretary'),
-> ('Dale',22,'cook'),
-> ('Edison',28,'singer');
Query OK, 3 rows affected (0.01 sec)
Records: 3 Duplicates: 0 Warnings: 0
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
| 3 | Evans | 27 | secretary |
| 4 | Dale | 22 | cook |
| 5 | Edison | 28 | singer |
+----+---------+-----+------------+
5 rows in set (0.00 sec)
◆将查询结果插入到表中◆
为了实现将另一个表中的记录插入到本表中,我们新建一个person_old表,其表结构和person相同,我们将person_old表中的内容全部迁移到person中去,SQL语句如下:
1.创建一个person_old表,并插入测试字段:
MariaDB [lyshark]> create table person_old
-> (
-> id int unsigned not null auto_increment,
-> name char(50) not null default '',
-> age int not null default 0,
-> info char(50) null,
-> primary key(id)
-> );
Query OK, 0 rows affected (0.01 sec)
MariaDB [lyshark]> insert into person_old
-> values(11,'harry',20,'student'),(12,'Beckham',33,'police');
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
2.接下来我们将person_old表中的内容迁移到person中去
MariaDB [lyshark]> select * from person_old;
+----+---------+-----+---------+
| id | name | age | info |
+----+---------+-----+---------+
| 11 | harry | 20 | student |
| 12 | Beckham | 33 | police |
+----+---------+-----+---------+
2 rows in set (0.00 sec)
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
| 3 | Evans | 27 | secretary |
| 4 | Dale | 22 | cook |
| 5 | Edison | 28 | singer |
+----+---------+-----+------------+
5 rows in set (0.00 sec)
MariaDB [lyshark]> insert into person(id,name,age,info)
-> select id,name,age,info from person_old;
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
| 3 | Evans | 27 | secretary |
| 4 | Dale | 22 | cook |
| 5 | Edison | 28 | singer |
| 11 | harry | 20 | student |
| 12 | Beckham | 33 | police |
+----+---------+-----+------------+
7 rows in set (0.00 sec)
## MariaDB 更新数据
表中有数据之后,接下来我们可以对数据进行更新操作,MariaDB中使用UPDATE语句更新表中的记录,可以更新特定的行或同时更新所有的行,基本语句结构如下:
UPDATE 表名称
SET 字段1=修改值,字段2=修改值,字段3=修改值
where (限定条件);
◆更新表中指定字段◆
修改person表中数据,将id=11的name字段的值改为xxxx,age字段改为200,SQL语句如下:
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
| 3 | Evans | 27 | secretary |
| 4 | Dale | 22 | cook |
| 5 | Edison | 28 | singer |
| 11 | harry | 20 | student |
| 12 | Beckham | 33 | police |
+----+---------+-----+------------+
7 rows in set (0.00 sec)
MariaDB [lyshark]> update person set age=200,name='xxxx' where id=11; #更新单个字段
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
| 3 | Evans | 27 | secretary |
| 4 | Dale | 22 | cook |
| 5 | Edison | 28 | singer |
| 11 | xxxx | 200 | student |
| 12 | Beckham | 33 | police |
+----+---------+-----+------------+
7 rows in set (0.00 sec)
◆更新表的一个范围◆
更新person表中的记录,将1-12的info字段全部改为lyshark blog,SQL语句如下:
MariaDB [lyshark]> select * from person;
+----+---------+-----+------------+
| id | name | age | info |
+----+---------+-----+------------+
| 1 | LyShark | 22 | Lawyer |
| 2 | Willam | 18 | sports man |
| 3 | Evans | 27 | secretary |
| 4 | Dale | 22 | cook |
| 5 | Edison | 28 | singer |
| 11 | xxxx | 200 | student |
| 12 | Beckham | 33 | police |
+----+---------+-----+------------+
7 rows in set (0.00 sec)
MariaDB [lyshark]> update person set info='lyshark blog' where age between 1 and 200; #指定修改的字段
Query OK, 7 rows affected (0.00 sec)
Rows matched: 7 Changed: 7 Warnings: 0
MariaDB [lyshark]> select * from person;
+----+---------+-----+--------------+
| id | name | age | info |
+----+---------+-----+--------------+
| 1 | LyShark | 22 | lyshark blog |
| 2 | Willam | 18 | lyshark blog |
| 3 | Evans | 27 | lyshark blog |
| 4 | Dale | 22 | lyshark blog |
| 5 | Edison | 28 | lyshark blog |
| 11 | xxxx | 200 | lyshark blog |
| 12 | Beckham | 33 | lyshark blog |
+----+---------+-----+--------------+
7 rows in set (0.00 sec)
## MariaDB 删除数据
◆删除表中指定记录◆
通过id号,删除表中指定列,此处删除第id=12号,这条记录,SQL语句如下:
MariaDB [lyshark]> select * from person;
+----+---------+-----+--------------+
| id | name | age | info |
+----+---------+-----+--------------+
| 1 | LyShark | 22 | lyshark blog |
| 2 | Willam | 18 | lyshark blog |
| 3 | Evans | 27 | lyshark blog |
| 4 | Dale | 22 | lyshark blog |
| 5 | Edison | 28 | lyshark blog |
| 11 | xxxx | 200 | lyshark blog |
| 12 | Beckham | 33 | lyshark blog |
+----+---------+-----+--------------+
7 rows in set (0.00 sec)
MariaDB [lyshark]> delete from person where id=12; #通过id号，删除表中指定列
Query OK, 1 row affected (0.05 sec)
MariaDB [lyshark]> select * from person;
+----+---------+-----+--------------+
| id | name | age | info |
+----+---------+-----+--------------+
| 1 | LyShark | 22 | lyshark blog |
| 2 | Willam | 18 | lyshark blog |
| 3 | Evans | 27 | lyshark blog |
| 4 | Dale | 22 | lyshark blog |
| 5 | Edison | 28 | lyshark blog |
| 11 | xxxx | 200 | lyshark blog |
+----+---------+-----+--------------+
6 rows in set (0.00 sec)
◆删除表的一个范围◆
在person表中,删除age字段值在19-22的记录,SQL语句如下:
MariaDB [lyshark]> select * from person;
+----+---------+-----+--------------+
| id | name | age | info |
+----+---------+-----+--------------+
| 1 | LyShark | 22 | lyshark blog |
| 2 | Willam | 18 | lyshark blog |
| 3 | Evans | 27 | lyshark blog |
| 4 | Dale | 22 | lyshark blog |
| 5 | Edison | 28 | lyshark blog |
| 11 | xxxx | 200 | lyshark blog |
+----+---------+-----+--------------+
6 rows in set (0.00 sec)
MariaDB [lyshark]> delete from person where age between 19 and 22; #指定范围删除
Query OK, 2 rows affected (0.00 sec)
MariaDB [lyshark]> select * from person;
+----+--------+-----+--------------+
| id | name | age | info |
+----+--------+-----+--------------+
| 2 | Willam | 18 | lyshark blog |
| 3 | Evans | 27 | lyshark blog |
| 5 | Edison | 28 | lyshark blog |
| 11 | xxxx | 200 | lyshark blog |
+----+--------+-----+--------------+
4 rows in set (0.00 sec)
◆清空表中所有记录◆
MariaDB [lyshark]> select * from person;
+----+--------+-----+--------------+
| id | name | age | info |
+----+--------+-----+--------------+
| 2 | Willam | 18 | lyshark blog |
| 3 | Evans | 27 | lyshark blog |
| 5 | Edison | 28 | lyshark blog |
| 11 | xxxx | 200 | lyshark blog |
+----+--------+-----+--------------+
4 rows in set (0.00 sec)
MariaDB [lyshark]> delete from person; #清空表中所有记录
Query OK, 4 rows affected (0.00 sec)
MariaDB [lyshark]> select * from person;
Empty set (0.00 sec)
参考文献：mysql5.7从入门到精通
MariaDB 插入&更新&删除数据(8)的更多相关文章
- oracle插入,更新,删除数据
插入,更新,删除数据 oracle提供了功能丰富的数据库管理语句 包括有效的向数据库中插入数据的insert语句 更新数据的update语句 以及当数据不再使用时删除数据的delete语句 更改数据之 ...
- 我的MYSQL学习心得（八） 插入 更新 删除
我的MYSQL学习心得(八) 插入 更新 删除 我的MYSQL学习心得(一) 简单语法 我的MYSQL学习心得(二) 数据类型宽度 我的MYSQL学习心得(三) 查看字段长度 我的MYSQL学习心得( ...
- sqlserver 插入 更新 删除 语句中的 output子句
官方文档镇楼: https://docs.microsoft.com/zh-cn/previous-versions/sql/sql-server-2008/ms177564(v=sql.100) 从 ...
- MySQL基本SQL语句之数据插入、删除数据和更新数据
一.INSERT插入数据: 方法一:批量插入 基本语法: INSERT INTO tb_name (col1, col2, ...) VALUES (val1, val2, ...)[,(val1, ...
- Hibernate更新删除数据后，再查询数据依然存在的解决办法
删除数据后,重新查询了数据库,DB中记录已经删除了,但是数据依然能查询到,网上都说是Hibernate的缓冲问题. 我对session进行了clear,flush,并且在事务和查询中都对session ...
- Mysql添加更新删除数据-表
例如 此处拥有一个表名为 uuser 为表添加新数据 ,'); ,'); ,'); 假如只想添加uid和uname ,'小张'); 那么pas自动填充为NULL. 为表更新数据 这里把小王的pas改成 ...
- MySQL 向表中插入、删除数据
一.向表中插入一条信息 1.查看表中的数据 mysql> SELECT * FROM user; +----+---------+----------+ | id | account | pas ...
- 数据库SQL语言学习--上机练习3（插入 更新 删除）
上机练习3 . 将一个新学生记录(学号::姓名:陈冬:性别:男:所在系:信息系:年龄:20岁)插入到Student表中: ALTER TABLE Student ,); UPDATE Student ...
- ORACLE no1 存储过程插入更新表数据
CREATE OR REPLACE PROCEDURE sp_cust_main_data_yx(InStrDate IN VARCHAR2, ...
随机推荐
- linux和普通文本的换行问题
情景一: 普通文本 vim操作换行 :%s#xxx#\n#g 情景二: linux环境换行 vim :%s#xxx#\r#g
- 很漂亮的IP头格式
IP数据包格式 TCP/IP协议定义了一个在因特网上传输的包,称为IP数据报(IP Datagram).这是一个与硬件无关的虚拟包,由首部和数据两部分组成.首部的前一部分是固定长度,共 20 字节,是 ...
- [Office]Execl取消保护密码
2007版Excel表格中可以按照以下方式建宏: 打开Excel表格中的Excel选项,选择自定义,得到如下画面: 然后在左边侧框栏中选择“查看宏”或者Alt+F11 之后双击或者选择添加按钮,则可 ...
- mybatis学习 十六 auto_mapping实现连表查询
只能使用多表联合查询方式. 要求:查询出的列别和属性名相同. 点字符 "." 在 SQL 是关键字符,两侧添加反单引号(Tab键上的一个字符) <select id=&q ...
- MySQL open_files_limit相关设置
背景: 数据库链接不上,报错: root@localhost:/var/log/mysql# mysql -uzjy -p -h192.168.1.111 --default-charact ...
- python下使用opencv拍照
首先在命令中安装opencv: pip install opencv-python 然后打开notebook: jupyter notebook 建立文件,写入如下代码: import cv2 cap ...
- 25、UIView的setNeedsLayout, layoutIfNeeded 和 layoutSubviews 方法之间的关系解释
layoutSubviews总结 ios layout机制相关方法 - (CGSize)sizeThatFits:(CGSize)size- (void)sizeToFit——————- - (voi ...
- 2019.02.06 bzoj4503: 两个串（fft）
传送门 题意简述:给两个字符串s,ts,ts,t,ttt中可能有通配符,问ttt在sss出现的次数和所有位置. 思路:一道很熟悉的题,跟bzoj4259bzoj4259bzoj4259差不多的. 然后 ...
- java常用设计模式七：装饰模式
一.概念 装饰模式可以在不改变一个对象本身功能的基础上给对象增加额外的新行为. 基本角色: 抽象构件:它是具体构件和抽象装饰类的共同父类,声明了在具体构件中实现的业务方法,它的引入可以使客户端以一致的 ...
- Win7 IIS 部署站点遇到的问题 如 HTTP 错误 404.XX
HTTP 错误 404.2 - Not Found 由于 Web 服务器上的“ISAPI 和 CGI 限制”列表设置,无法提供您请求的页面. 解决办法:设置为允许-面相 =============== ...