学生信息管理系统

<?php

// 导入数据库连接库

require_once 'db.php';

// 创建学生信息表

function createStudentTable() {

$conn = connectToDB();

$sql = "CREATE TABLE IF NOT EXISTS students (

id INT AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(100) NOT NULL,

age INT NOT NULL,

major VARCHAR(100) NOT NULL

)";

if ($conn->query($sql) === TRUE) {

echo "Table students created successfully";

} else {

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echo "Error creating table: " . $conn->error;

}

$conn->close();

}

// 添加学生信息

function addStudent($name, $age, $major) {

$conn = connectToDB();

$stmt = $conn->prepare("INSERT INTO students (name, age, major) VALUES (?, ?, ?)");

$stmt->bind_param("sii", $name, $age, $major);

if ($stmt->execute() === TRUE) {

echo "New record created successfully";

} else {

echo "Error: " . $stmt->error;

}

$stmt->close();

$conn->close();

}

// 查询所有学生信息

function getAllStudents() {

$conn = connectToDB();

$result = $conn->query("SELECT * FROM students");

if ($result->num_rows > 0) {

while($row = $result->fetch_assoc()) {

echo "ID: " . $row["id"]. " - Name: " . $row["name"]. " - Age: " . $row["age"]. " - Major: " . $row["major"]. "
";

}

} else {

echo "0 results";

}

$conn->close();

}

// 连接数据库

function connectToDB() {

$servername = "localhost";

$username = "root";

$password = "";

$dbname = "student_management";

// 创建连接

$conn = new mysqli($servername, $username, $password, $dbname);

// 检测连接

if ($conn->connect_error) {

die("Connection failed: " . $conn->connect_error);

}

return $conn;

}

?>