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