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41 lines
1.2 KiB
41 lines
1.2 KiB
<?php
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namespace app\service;
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use app\model\Order;
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class CardService
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{
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// 生成 [A-Z][0-9]{3} 格式号码牌，最多重试10次避免冲突
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public function generate(): string
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{
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$maxRetry = 10;
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for ($i = 0; $i < $maxRetry; $i++) {
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$letter = chr(rand(65, 90)); // A-Z
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$num = str_pad(rand(0, 999), 3, '0', STR_PAD_LEFT);
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$cardNo = $letter . $num;
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if ($this->isAvailable($cardNo)) {
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return $cardNo;
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}
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}
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// 冲突过多时追加随机码
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return chr(rand(65, 90)) . str_pad(rand(0, 999), 3, '0', STR_PAD_LEFT) . rand(0, 9);
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}
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// 检查号码牌是否可用（不存在进行中/新单订单）
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public function isAvailable(string $cardNo): bool
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{
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$count = Order::where('card_no', $cardNo)
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->whereIn('status', [0, 1])
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->count();
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return $count === 0;
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}
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// 释放号码牌：检查该cardNo是否还有未完成订单
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public function release(string $cardNo): bool
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{
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$count = Order::where('card_no', $cardNo)
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->whereIn('status', [0, 1])
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->count();
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return $count === 0; // true=已释放，false=仍占用
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}
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}
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