如何在PHP中处理记账数据 - 解释如何处理和存储记账数据

账户表 (accounts)
- id (主键)
- 名称
- 余额

记账条目表 (entries)
- id (主键)
- 日期
- 账户id (外键，引用账户表的id)
- 类别
- 金额
- 备注

<?php
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

<?php
$date = "2022-01-01";
$accountId = 1;
$category = "购物";
$amount = 100.00;
$remark = "购买衣物";

$sql = "INSERT INTO entries (日期, 账户id, 类别, 金额, 备注) VALUES ('$date', $accountId, '$category', $amount, '$remark')";

if ($conn->query($sql) === TRUE) {
    echo "记账数据插入成功";
} else {
    echo "插入失败: " . $conn->error;
}

<?php
$accountId = 1;

$sql = "SELECT * FROM entries WHERE 账户id = $accountId";

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

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "日期: " . $row["日期"]. " - 类别: " . $row["类别"]. " - 金额: " . $row["金额"]. "<br>";
    }
} else {
    echo "没有记账数据";
}