新增商品编号搜索

backend/migrations/000002_add_listing_no.sql

@@ -0,0 +1,33 @@
+-- 商品编号：用于前台展示、搜索和客服定位
+ALTER TABLE rental_listings
+  ADD COLUMN listing_no VARCHAR(20) NULL COMMENT '商品编号，格式yyyyMMddNNNN' AFTER id;
+
+UPDATE rental_listings AS l
+JOIN (
+  SELECT
+    id,
+    CONCAT(
+      DATE_FORMAT(created_at, '%Y%m%d'),
+      LPAD(ROW_NUMBER() OVER (PARTITION BY DATE(created_at) ORDER BY id), 4, '0')
+    ) AS generated_listing_no
+  FROM rental_listings
+) AS seq ON seq.id = l.id
+SET l.listing_no = seq.generated_listing_no
+WHERE l.listing_no IS NULL OR l.listing_no = '';
+
+ALTER TABLE rental_listings
+  MODIFY COLUMN listing_no VARCHAR(20) NOT NULL COMMENT '商品编号，格式yyyyMMddNNNN',
+  ADD UNIQUE KEY uk_rental_listings_listing_no (listing_no);
+
+CREATE TABLE IF NOT EXISTS listing_no_sequences (
+  biz_date CHAR(8) PRIMARY KEY COMMENT '业务日期yyyyMMdd',
+  next_seq INT NOT NULL DEFAULT 0 COMMENT '当日已分配最大序号',
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='商品编号日序列表';
+
+INSERT INTO listing_no_sequences (biz_date, next_seq)
+SELECT DATE_FORMAT(created_at, '%Y%m%d') AS biz_date, COUNT(*) AS next_seq
+FROM rental_listings
+GROUP BY DATE_FORMAT(created_at, '%Y%m%d')
+ON DUPLICATE KEY UPDATE next_seq = GREATEST(next_seq, VALUES(next_seq));