使用PHP開發實現待辦事項功能的企業資源計畫（ERP）系統

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "erp_system";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
 die("连接失败: " . $conn->connect_error);
}

// 查询待办事项
$sql = "SELECT tasks.ID, users.Name, tasks.Content, tasks.Deadline 
     FROM tasks 
     INNER JOIN users ON tasks.User_ID = users.ID";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
 // 输出数据
 while($row = $result->fetch_assoc()) {
     echo "ID: " . $row["ID"]. " - 用户: " . $row["Name"]. " - 内容: " . $row["Content"]. " - 截止日期: " . $row["Deadline"]. "<br>";
 }
} else {
 echo "0 结果";
}

// 关闭数据库连接
$conn->close();
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "erp_system";

$content = $_POST["content"];
$deadline = $_POST["deadline"];
$user_id = $_POST["user_id"];

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
 die("连接失败: " . $conn->connect_error);
}

// 添加待办事项
$sql = "INSERT INTO tasks (User_ID, Content, Deadline)
     VALUES ('$user_id', '$content', '$deadline')";

if ($conn->query($sql) === TRUE) {
 echo "待办事项添加成功";
} else {
 echo "Error: " . $sql . "<br>" . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "erp_system";

$task_id = $_POST["task_id"];

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
 die("连接失败: " . $conn->connect_error);
}

// 删除待办事项
$sql = "DELETE FROM tasks WHERE ID='$task_id'";

if ($conn->query($sql) === TRUE) {
 echo "待办事项删除成功";
} else {
 echo "Error: " . $sql . "<br>" . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>