前端全栈之路——Mysql
centos安装mysql
$ sudo dnf install @mysql
$ sudo systemctl enable --now mysql
$ sudo systemctl status mysql
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链接数据库
mysql -u root -p
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建立和删除数据库
- 查看数据库
// 使用;结尾，表示这是一个完整的SQL语句
// SQL语句通常都是语意化的 show(显示) databases(数据库复数)
// 一开始显示的是mysql默认的数据库，里面存放了mysql服务的相关配置和信息
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
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- 建立数据库
// 建立一个名称为studb的数据库 create(建立) database(数据库单数)
mysql> create database studb;
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| studb |
| sys |
+--------------------+
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- 删除数据库
// 删除名称为studb的数据库 drop(丢弃)
// 警告:不要随意删除mysql默认的数据库，后果自负
mysql> drop database studb;
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
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建立列表
- 选择一个数据库
mysql> use studb;
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- 建立列表
// 建立一个名称为student的table
// 一行输入显示不下能够enter换行
// SQL一句完整的语句是以;为标志的
// 一个table是由行和列组成的，列就是常说的表头
mysql> CREATE TABLE `student` (
-> id INT, //id列存储整数型数据
-> name VARCHAR(64), //name列存储可变字符型数据
-> age INT, //age列存储整数型数据
-> city VARCHAR(64), //city列存储可变字符型数据
-> idcard VARCHAR(64) //idcard列存储可变字符型数据
-> );
// 显示studb下的全部table
mysql> show tables;
+-----------------+
| Tables_in_studb |
+-----------------+
| student |
+-----------------+
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- 显示列表列信息
// DESC(描述)
mysql> DESC student;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | NULL | |
| idcard | varchar(64) | YES | | NULL | |
+--------+-------------+------+-----+---------+-------+
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- 删除列表
mysql> drop table student;
mysql> show tables;
Empty set (0.00 sec)
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列表行操做
- 插入行数据
// 插入一行数据 INSERT(插入) INTO(往...里面) VALUES(值复数)
mysql> INSERT INTO student(id,name,age,city,idcard)
-> VALUES(1,'张三',18,'北京','BJ123');
mysql> INSERT INTO student(id,name,age,city,idcard)
-> VALUES(2,'李四',24,'上海','SH456');
// 显示筛选出符合条件的数据 SELECT(选择) FROM(从...中)
// * 表明全部的筛选条件，即显示全部的行信息
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | BJ123 |
| 2 | 李四 | 24 | 上海 | SH456 |
+------+--------+------+--------+--------+
注意事项:
1. 每次插入一行数据，而且是完整的数据，不能缺乏字段
2. 每一个数据的类型，数据精度和位数必须和对应的列一致
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- 更新行数据
// 更新李四这一行的age和city数据
// 能够同时更新多列的数据用逗号隔开
// WHERE id=2 表示只更新id等于2的这一行 WHERE(在...哪些地方)
mysql> UPDATE student SET age=20,city='杭州' WHERE id=2;
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | BJ123 |
| 2 | 李四 | 20 | 杭州 | SH456 |
+------+--------+------+--------+--------+
// 不是用WHERE的区别
mysql> UPDATE student SET age=20,city='上海';
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 20 | 上海 | BJ123 |
| 2 | 李四 | 20 | 上海 | SH456 |
+------+--------+------+--------+--------+
// WHERE还能够混合其余运算符
mysql> UPDATE student SET age=18,city='杭州' WHERE city='上海' AND idcard= 'BJ123';
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 18 | 杭州 | BJ123 |
| 2 | 李四 | 20 | 上海 | SH456 |
+------+--------+------+--------+--------+
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- 删除行数据
// 删除行信息 DELETE(删除)
// WHERE还能够混合其余运算符
// 若是存在主外键，必须县删除子表里面对应的行信息，再删除父表中的行信息
mysql> DELETE FROM student WHERE id=2;
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 18 | 杭州 | BJ123 |
+------+--------+------+--------+--------+
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- 截断列表和清空列表
// 会重置标识符，下文解释
// 不写入日志，不能恢复
mysql> TRUNCATE table student;
Empty set (0.00 sec)
// 不会重置标识符，下文解释
// 会写入日志，能恢复
mysql> DELETE FROM student;
Empty set (0.00 sec)
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列表列操做
- 删除列
// 删除idcard字段 ALTER(更改)
mysql> ALTER TABLE student DROP idcard;
mysql> DESC student;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
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- 增长列
// 增长idcard字段 COLUMN(列)
mysql> ALTER TABLE student ADD COLUMN idcard VARCHAR(64);
mysql> DESC student;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | NULL | |
| idcard | varchar(64) | YES | | NULL | |
+--------+-------------+------+-----+---------+-------+
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- 修改列的字段
// 修改idcard字段长度 MODIFY(修改)mysql
mysql> ALTER TABLE student MODIFY idcard VARCHAR(128);
mysql> DESC student;
+--------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+--------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | NULL | |
| idcard | varchar(128) | YES | | NULL | |
+--------+--------------+------+-----+---------+-------+
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约束
- 惟一索引约束
// 惟一约束就是该表中不容许这个字段存在重复的值
// 好比每一个人的身份证号码是惟一的，不存在两我的是同样的身份证号码
// UNIQUE(惟一) INDEX(索引) uq_student_idcard(按照语意化取的名字)
mysql> ALTER TABLE student ADD UNIQUE INDEX uq_student_idcard(idcard);
mysql> DESC student;
+--------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+--------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | NULL | |
| idcard | varchar(128) | YES | UNI | NULL | |
+--------+--------------+------+-----+---------+-------+
// 当将某个字段增长惟一约束后，往表中增长数据出现重复的值，就会报错
mysql> INSERT INTO student (id,name,age,city,idcard)
-> VALUE(1,'张三',18,'上海',123);
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 18 | 上海 | 123 |
+------+--------+------+--------+--------+
mysql> INSERT INTO student (id,name,age,city,idcard)
-> VALUE(2,'李四',24,'杭州',123);
ERROR 1062 (23000): Duplicate entry '123' for key 'student.uq_student_idcard'
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- 默认约束
// 默认约束就是，往表中添加数据时，若是没有默认约束的字段赋值，那么就会使用默认值
mysql> ALTER TABLE student MODIFY city VARCHAR(64) DEFAULT '北京';
mysql> DESC student;
+--------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+--------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | 北京 | |
| idcard | varchar(128) | YES | UNI | NULL | |
+--------+--------------+------+-----+---------+-------+
// 往表中增长数据时，没有给city赋值，使用的时默认值"北京"
mysql> INSERT INTO student (id,name,age,idcard)
-> VALUE(2,'李四',24,456);
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 1 | 张三 | 18 | 上海 | 123 |
| 2 | 李四 | 24 | 北京 | 456 |
+------+--------+------+--------+--------+
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- 非空约束
// 非空约束，就是往表中增长数据的时候，非空约束的字段不能为空
// UNI + NOT NULL => PRI
mysql> ALTER TABLE student MODIFY idcard VARCHAR(64) NOT NULL;
mysql> DESC student;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | 北京 | |
| idcard | varchar(64) | NO | PRI | NULL | |
+--------+-------------+------+-----+---------+-------+
mysql> INSERT INTO student (id,name,age,idcard) VALUE(3,'王五',24,null);
ERROR 1048 (23000): Column 'idcard' cannot be null
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- 主健约束
// UNI + NOT NULL => PRI
// 主键是被挑选出来,做为行的唯一标识关键字,即主键默认是惟一索引的，而且非空
// 去掉idcard的主键，只要去掉非空约束就能够了
mysql> ALTER TABLE student MODIFY idcard VARCHAR(64);
mysql> DESC student;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| id | int | YES | | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | 北京 | |
| idcard | varchar(64) | YES | UNI | NULL | |
+--------+-------------+------+-----+---------+-------+
// 若是没有主键，那么表中的数据是按照插入的顺序来排列的，不便于查找
// 删除表中的数据
mysql> DELETE FROM student WHERE id=1 OR id= 2;
mysql> SELECT * FROM student;
Empty set (0.00 sec)
mysql> INSERT INTO student (id,name,age,idcard)
-> VALUE(2,'李四',24,456);
mysql> INSERT INTO student (id,name,age,idcard)
-> VALUE(1,'张三',18,123);
mysql> SELECT * FROM student;
+------+--------+------+--------+--------+
| id | name | age | city | idcard |
+------+--------+------+--------+--------+
| 2 | 李四 | 24 | 北京 | 456 |
| 1 | 张三 | 18 | 北京 | 123 |
+------+--------+------+--------+--------+
// 给id增长主键约束
// 数据就会按照正常的顺序来
mysql> ALTER TABLE student ADD PRIMARY KEY(id);
mysql> DESC student;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| id | int | NO | PRI | NULL | |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | 北京 | |
| idcard | varchar(64) | YES | UNI | NULL | |
+--------+-------------+------+-----+---------+-------+
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | 123 |
| 2 | 李四 | 24 | 北京 | 456 |
+----+--------+------+--------+--------+
// 通常会给主键增长自动递增，这样的话就不用每次给id赋值，会自动递增
mysql> ALTER TABLE student MODIFY id INT AUTO_INCREMENT;
mysql> DESC student;
+--------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+----------------+
| id | int | NO | PRI | NULL | auto_increment |
| name | varchar(64) | YES | | NULL | |
| age | int | YES | | NULL | |
| city | varchar(64) | YES | | 北京 | |
| idcard | varchar(64) | YES | UNI | NULL | |
+--------+-------------+------+-----+---------+----------------+
// 没有给id指定值
mysql> INSERT INTO student (name,age,idcard) VALUE('张三',18,789);
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | 123 |
| 2 | 李四 | 24 | 北京 | 456 |
| 3 | 张三 | 18 | 北京 | 789 |
+----+--------+------+--------+--------+
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- 外健
//建立另一个成绩表score
mysql> CREATE TABLE score (
-> student_id INT PRIMARY,
-> grad INT NOT NULL
-> )
-> ;
mysql> show tables;
+-----------------+
| Tables_in_studb |
+-----------------+
| score |
| student |
+-----------------+
mysql> DESC score;
+-------+------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------+------+-----+---------+-------+
| id | int | NO | PRI | NULL | |
| grade | int | NO | | NULL | |
+-------+------+------+-----+---------+-------+
// 给score表增长外键fk_score_student_id将student和student表中的id进行关联
// CONSTRAINT(约束) FOREIGN KEY(外键) REFERENCES(参考物)
// 往score表中插入数据的时候，必须先在student表中先查一条对应的数据
// 这就是先有父，才有子
mysql> ALTER TABLE score ADD CONSTRAINT fk_score_student_id FOREIGN KEY(student_id) REFERENCES student(id);
mysql> INSERT INTO score (student_id,grade) VALUE(6,99);
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails
(`studb`.`score`, CONSTRAINT `fk_score_student_id` FOREIGN KEY (`student_id`) REFERENCES `student` (`id`))
mysql> INSERT INTO score (student_id,grade) VALUE(1,99);
mysql> SELECT * FROM score;
+------------+-------+
| student_id | grade |
+------------+-------+
| 1 | 99 |
+------------+-------+
// 若是要删除一条student中的数据，必须先删除全部的依赖这条数据的数据
// 而后再删除这条数据，这就是先删除子表，再删除父表
mysql> DELETE FROM student WHERE id=1;
ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`studb`.`score`, CONSTRAINT `fk_score_student_id` FOREIGN KEY (`student_id`) REFERENCES `student` (`id`))
mysql> DELETE FROM score WHERE student_id=1;
mysql> DELETE FROM student WHERE id=1;
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 2 | 李四 | 24 | 北京 | 456 |
| 3 | 张三 | 18 | 北京 | 789 |
+----+--------+------+--------+--------+
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数据查询
- 查询语法
// []表示可缺省
// ORDER BY(按照什么方式排序) ASC(升序) DESC(降序)
SELECT <列名>
FORM <表名>
[WHERE] <查询条件表达式>
[ORDER BY <排序的列名>[ASC或者DESC]]
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | 123 |
| 2 | 李四 | 24 | 上海 | 456 |
| 3 | 张三 | 18 | 杭州 | 789 |
| 4 | 赵六 | 26 | 北京 | 246 |
+----+--------+------+--------+--------+
// 多个排序条件可使用逗号隔开
mysql> SELECT id,name
-> FROM student
-> WHERE city='北京'
-> ORDER BY id DESC;
+----+--------+
| id | name |
+----+--------+
| 4 | 赵六 |
| 1 | 张三 |
+----+--------+
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- 别名
// as能够省略
mysql> SELECT id,name,city as home
-> FROM student
-> WHERE city='北京'
-> ORDER BY id DESC;
+----+--------+--------+
| id | name | home |
+----+--------+--------+
| 4 | 赵六 | 北京 |
| 1 | 张三 | 北京 |
+----+--------+--------+
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- 常量列
// as能够省略
mysql> SELECT id,name,city home,'中国' as country
-> FROM student
-> WHERE city='北京'
-> ORDER BY id DESC;
+----+--------+--------+---------+
| id | name | home | country |
+----+--------+--------+---------+
| 4 | 赵六 | 北京 | 中国 |
| 1 | 张三 | 北京 | 中国 |
+----+--------+--------+---------+
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- 分页
// 3,3 第一个3表示从3开始取(index)，第二个3表示一个取几条(page_size)
mysql> SELECT id,name,city
-> FROM student
-> limit 3,3;
+----+--------+--------+
| id | name | city |
+----+--------+--------+
| 4 | 赵六 | 北京 |
+----+--------+--------+
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表链接
- 内链接
// 用于连表查询，取交集
// 有两种写法 INNER JOIN(内链接)
// SELECT * FROM student,score WHERE student.id = score.student_id;
// SELECT * FROM student INNER JOIN score ON student.id = score.student_id;
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | 123 |
| 2 | 李四 | 24 | 上海 | 456 |
| 3 | 张三 | 18 | 杭州 | 789 |
| 4 | 赵六 | 26 | 北京 | 246 |
+----+--------+------+--------+--------+
mysql> SELECT * FROM score;
+------------+-------+
| student_id | grade |
+------------+-------+
| 1 | 99 |
+------------+-------+
mysql> SELECT * FROM student,score WHERE student.id = score.student_id;
+----+--------+------+--------+--------+------------+-------+
| id | name | age | city | idcard | student_id | grade |
+----+--------+------+--------+--------+------------+-------+
| 1 | 张三 | 18 | 北京 | 123 | 1 | 99 |
+----+--------+------+--------+--------+------------+-------+
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- 左外链接
// 用于连表查询，取左全集加上交集，数据缺省补NULL
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | 123 |
| 2 | 李四 | 24 | 上海 | 456 |
| 3 | 张三 | 18 | 杭州 | 789 |
| 4 | 赵六 | 26 | 北京 | 246 |
+----+--------+------+--------+--------+
mysql> SELECT * FROM score;
+------------+-------+
| student_id | grade |
+------------+-------+
| 1 | 99 |
+------------+-------+
mysql> SELECT * FROM student LEFT JOIN score ON student.id = score.student_id;
+----+--------+------+--------+--------+------------+-------+
| id | name | age | city | idcard | student_id | grade |
+----+--------+------+--------+--------+------------+-------+
| 1 | 张三 | 18 | 北京 | 123 | 1 | 99 |
| 2 | 李四 | 24 | 北京 | 456 | NULL | NULL |
| 3 | 张三 | 18 | 北京 | 789 | NULL | NULL |
| 4 | 赵六 | 26 | 北京 | 246 | NULL | NULL |
+----+--------+------+--------+--------+------------+-------+
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- 右外链接
// 用于连表查询，取右全集加上交集，数据缺省补NULL
mysql> SELECT * FROM student;
+----+--------+------+--------+--------+
| id | name | age | city | idcard |
+----+--------+------+--------+--------+
| 1 | 张三 | 18 | 北京 | 123 |
| 2 | 李四 | 24 | 上海 | 456 |
| 3 | 张三 | 18 | 杭州 | 789 |
| 4 | 赵六 | 26 | 北京 | 246 |
+----+--------+------+--------+--------+
mysql> SELECT * FROM score;
+------------+-------+
| student_id | grade |
+------------+-------+
| 1 | 99 |
+------------+-------+
mysql> SELECT * FROM student RIGHT JOIN score ON student.id = score.student_id;
mysql> SELECT * FROM student RIGHT JOIN score ON student.id = score.student_id;
+------+--------+------+--------+--------+------------+-------+
| id | name | age | city | idcard | student_id | grade |
+------+--------+------+--------+--------+------------+-------+
| 1 | 张三 | 18 | 北京 | 123 | 1 | 99 |
+------+--------+------+--------+--------+------------+-------+
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- 自链接
// 通常用于存储树形结构数据的表结构
mysql> CREATE table category(
-> id INT PRIMARY KEY AUTO_INCREMENT,
-> name VARCHAR(64) NOT NULL,
-> parent_id INT
-> );
mysql> DESC category;
+-----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+----------------+
| id | int | NO | PRI | NULL | auto_increment |
| name | varchar(64) | NO | | NULL | |
| parent_id | int | YES | | NULL | |
+-----------+-------------+------+-----+---------+----------------+
mysql> INSERT INTO category(name,parent_id) VALUE('男装',0);
mysql> INSERT INTO category(name,parent_id) VALUE('女装',0);
mysql> INSERT INTO category(name,parent_id) VALUE('领带',1);
mysql> INSERT INTO category(name,parent_id) VALUE('裙子',2);
mysql> SELECT * FROM category;
+----+--------+-----------+
| id | name | parent_id |
+----+--------+-----------+
| 1 | 男装 | 0 |
| 2 | 女装 | 0 |
| 3 | 领带 | 1 |
| 4 | 裙子 | 2 |
+----+--------+-----------+
mysql> SELECT c1.id,c1.name,c2.id parent_id,c2.name FROM
-> category c1 INNER JOIN category c2 ON
-> c1.parent_id = c2.id;
+----+--------+-----------+--------+
| id | name | parent_id | name |
+----+--------+-----------+--------+
| 3 | 领带 | 1 | 男装 |
| 4 | 裙子 | 2 | 女装 |
+----+--------+-----------+--------+
复制代码
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