47 lines
1.4 KiB
SQL
47 lines
1.4 KiB
SQL
SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci;
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USE hyapp_user;
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-- 粉丝数是资料卡高频读模型，新列使用 INSTANT DDL 只修改数据字典，
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-- 避免资料卡每次打开都反向 COUNT user_follows。条件 DDL 保持重复执行安全。
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SET @ddl := IF(
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(SELECT COUNT(*) FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'user_profile_stats'
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AND COLUMN_NAME = 'followers_count') = 0,
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'ALTER TABLE user_profile_stats
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ADD COLUMN followers_count BIGINT NOT NULL DEFAULT 0 COMMENT ''粉丝数量'' AFTER following_count,
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ALGORITHM=INSTANT',
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'SELECT 1'
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);
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PREPARE stmt FROM @ddl;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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-- 一次按现存 active 关注边回填；分组读取复用
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-- idx_user_follows_followee_status(app_code, followee_user_id, status, updated_at_ms)，
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-- ON DUPLICATE KEY 同时覆盖已有投影并补齐历史上缺失的被关注者投影行。
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INSERT INTO user_profile_stats (
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app_code,
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user_id,
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visitors_count,
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following_count,
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followers_count,
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friends_count,
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updated_at_ms
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)
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SELECT
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app_code,
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followee_user_id,
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0,
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0,
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COUNT(*),
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0,
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MAX(updated_at_ms)
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FROM user_follows FORCE INDEX (idx_user_follows_followee_status)
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WHERE status = 'active'
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GROUP BY app_code, followee_user_id
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ON DUPLICATE KEY UPDATE
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followers_count = VALUES(followers_count),
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updated_at_ms = GREATEST(user_profile_stats.updated_at_ms, VALUES(updated_at_ms));
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