MySQL implements the employee management function of the ordering system

In the ordering system, the employee management function is a very important part, because it can ensure the smooth progress of the employees' work and the correct processing of orders. MySQL is a commonly used database management system that can implement employee management functions. The following will introduce how MySQL implements the employee management function of the ordering system through specific code examples.

1. Create database and data table

First, you need to create a database to store relevant employee information. In MySQL, you can create a database named employee_management_system through the following command:

CREATE DATABASE employee_management_system;

After creating the database, you need to create a data table in it to store employee information. The following is the structure of the data table, including fields such as employee ID, name, password, and position:

CREATE TABLE `employee` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) NOT NULL,
  `password` varchar(100) NOT NULL,
  `position` varchar(50) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `name_UNIQUE` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

2. Insert employee information

After creating the data table structure, you need to Insert employee information into the data table. The following is an example of inserting three pieces of employee information into the data table:

INSERT INTO employee (name, password, position) VALUES
('alice', '123456', 'manager'),
('bob', '123456', 'waiter'),
('cathy', '123456', 'chef');

When inserting employee information, you can set the employee's password, position and other information.

3. Implementing the login function

Employee login is a very critical link, because employees can only work after successful login. The following is a simple login verification code example:

<?php
  $username = $_POST['username'];
  $password = $_POST['password'];

  $result = mysqli_query($con,"SELECT * FROM employee WHERE name='$username' and password='$password'");
  $count = mysqli_num_rows($result);

  if($count == 1) {
    // 登录成功，执行相关操作
  } else {
    // 登录失败，返回错误信息
  }
?>

The above code will query the employee table in the database and determine whether the employee exists based on the user name and password.

4. Implement employee information modification function

Employee information may change, such as position adjustment, password change, etc. The following is a code example for modifying employee information:

<?php
  $id = $_POST['id'];
  $name = $_POST['name'];
  $password = $_POST['password'];
  $position = $_POST['position'];

  $sql = "UPDATE employee SET name='$name', password='$password', position='$position' WHERE id='$id'";

  if(mysqli_query($con, $sql)) {
    // 更新成功，执行相关操作
  } else {
    // 更新失败，返回错误信息
  }
?>

This code will update the employee's name, password, position and other information in the database table based on the employee's ID.

5. Implement employee information query function

In order to facilitate the administrator to query employee information, the query function can be implemented through the following code:

<?php
  $result = mysqli_query($con,"SELECT * FROM employee");
  while($row = mysqli_fetch_array($result)) {
    echo "<tr>";
    echo "<td>" . $row['id'] . "</td>";
    echo "<td>" . $row['name'] . "</td>";
    echo "<td>" . $row['position'] . "</td>";
    echo "</tr>";
  }
?>

This This piece of code will query the database table for all employee information and display it in a table. Users can use this form to learn basic information about employees.

6. Implement employee information deletion function

Finally, if an employee resigns or the information is incorrect, managers need to delete them from the database. The following is a sample code to implement the employee information deletion function:

<?php
  $id = $_GET['id'];

  $sql = "DELETE FROM employee WHERE id='$id'";

  if(mysqli_query($con, $sql)) {
    // 删除成功，执行相关操作
  } else {
    // 删除失败，返回错误信息
  }
?>

This code will delete the employee's information from the database table based on the employee's ID.

Summary:

The above is a specific code example of MySQL implementing the employee management function of the ordering system. Employee management is an indispensable part of the ordering system. Through the MySQL database management system, the employee management function can be easily and quickly implemented to improve the work efficiency and accuracy of the ordering system.

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