62 lines
1.9 KiB
PHP
62 lines
1.9 KiB
PHP
<?php
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namespace App\Service\business;
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use Illuminate\Support\Facades\DB;
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/**
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* 业务单号生成（清单 QD_ / 订单 DD_）
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*
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* 随机串剔除 0/O/1/I/L 这些肉眼分不清的字符——单号会被打印在纸质报价单上人工抄录。
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* 唯一索引兜底，撞号就重试；重试仍失败宁可报错，也不要为了成功而降级成可能重复的号。
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*/
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class SerialNoService
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{
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private static mixed $_instance;
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private const ALPHABET = '23456789ABCDEFGHJKMNPQRSTUVWXYZ';
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public const PREFIX_LIST = 'QD_';
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public const PREFIX_ORDER = 'DD_';
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public static function getInstance(): null|static
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{
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$name = get_called_class();
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if (!isset(self::$_instance[$name])) {
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self::$_instance[$name] = new static();
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}
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return self::$_instance[$name];
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}
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/**
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* 生成一个库内不存在的单号
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*
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* @param string $prefix self::PREFIX_*
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* @param string $table business 连接下的表名（不带前缀）
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* @param string $column 单号字段
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*/
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public function generate(string $prefix, string $table, string $column, int $tries = 10): string
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{
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$day = date('Ymd');
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for ($i = 0; $i < $tries; $i++) {
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$no = $prefix . $day . $this->randomPart(6);
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$exists = DB::connection('business')->table($table)->where($column, $no)->exists();
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if (!$exists) {
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return $no;
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}
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}
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// 连续撞 10 次说明随机源或并发量出了问题，静默返回可能重复的号比抛错危险得多
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throw new \RuntimeException('单号生成失败，请重试');
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}
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private function randomPart(int $length): string
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{
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$max = strlen(self::ALPHABET) - 1;
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$out = '';
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for ($i = 0; $i < $length; $i++) {
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$out .= self::ALPHABET[random_int(0, $max)];
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}
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return $out;
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}
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}
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