How to achieve the flexibility of the MySQL table structure of the school management system?

How to achieve the flexibility of the MySQL table structure of the school management system?

The school management system is a very complex system that requires the management and statistics of key information such as students, teachers, courses, and grades. When designing the database of the school management system, how to achieve the flexibility of the table structure is a very important issue. This article will introduce how to achieve the flexibility of the school management system through reasonable table structure design and the use of MySQL features.

1. Use polymorphic relationships to establish table structures

In the school management system, students and teachers are two important entities, and they all have common attributes, such as Name, gender, age, etc. In order to achieve the flexibility of the table structure, polymorphic relationships can be used to build the table structure.

First, create a basic table, such as "personnel table", containing common attributes. Then, create a student table and a teacher table, both of which inherit from the "personnel table" and add their own unique attributes.

CREATE TABLE staff table (

id INT PRIMARY KEY AUTO_INCREMENT,
姓名 VARCHAR(50),
性别 VARCHAR(10),
年龄 INT

);

CREATE TABLE student table (

id INT PRIMARY KEY AUTO_INCREMENT,
学号 VARCHAR(20),
入学时间 DATE,
FOREIGN KEY (id) REFERENCES 人员表(id)

);

CREATE TABLE teacher table (

id INT PRIMARY KEY AUTO_INCREMENT,
工号 VARCHAR(20),
职称 VARCHAR(50),
FOREIGN KEY (id) REFERENCES 人员表(id)

);

Through this table structure design, other entities, such as principals, employees, etc., can be flexibly added without changing the basic table structure, thereby improving the system's efficiency. Scalability.

2. Use foreign key associations to establish connections between tables

In the school management system, there is a many-to-many relationship between students and courses. A student can choose Multiple courses, one course can also have multiple students to choose from. To achieve this relationship, foreign key associations can be used to establish connections between tables.

First, create a "course schedule" that contains course-related information.

CREATE TABLE Course Schedule (

id INT PRIMARY KEY AUTO_INCREMENT,
课程名称 VARCHAR(50),
教师id INT,
FOREIGN KEY (教师id) REFERENCES 教师表(id)

);

Then, create a "Course Selection Table" to store the courses students take.

CREATE TABLE course selection table (

学生id INT,
课程id INT,
PRIMARY KEY (学生id, 课程id),
FOREIGN KEY (学生id) REFERENCES 学生表(id),
FOREIGN KEY (课程id) REFERENCES 课程表(id)

);

Through this table structure design, new courses and students can be flexibly added, while maintaining the relationship between students and courses Relationship.

3. Use views and stored procedures to improve the flexibility of the table structure

In addition to the above table structure design, you can also use MySQL views and stored procedures to improve the flexibility of the table structure. flexibility.

Using views can abstract and simplify tables, and at the same time, you can flexibly filter and calculate data according to needs.

CREATE VIEW Student Score View AS
SELECT Student Table. Name, Course Schedule. Course Name, Grade Table. Grade
FROM Student Table
JOIN Grade Table ON Student Table.id = Grade Table.Studentid
JOIN Curriculum ON Grade Table.Courseid = Curriculum.id;

Using stored procedures can encapsulate and reuse table operations.

CREATE PROCEDURE ADD STUDENT(IN NAME VARCHAR(50), IN GENDER VARCHAR(10), IN AGE INT)
BEGIN

INSERT INTO 学生表(姓名, 性别, 年龄) VALUES(姓名, 性别, 年龄);

END;

VIA VIEW And the use of stored procedures can more flexibly operate and maintain the table structure, reducing direct modification and dependence on the table structure.

In summary, through reasonable table structure design and the use of MySQL features, the flexibility of the MySQL table structure of the school management system can be achieved. Using technologies such as polymorphic relationships, foreign key associations, views, and stored procedures, you can flexibly add and delete entities, and maintain relationships between tables. Such a design will greatly improve the scalability and maintainability of the school management system.

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