94 lines
3.7 KiB
SQL
94 lines
3.7 KiB
SQL
-- 文件存储分层改造：yz_system_files 新增归属与存储字段
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-- 对应计划文档：go/docs/文件存储分层改造计划.md S1
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--
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-- 幂等脚本：用存储过程逐项判断，已存在的列/索引自动跳过，可反复执行，不会报
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-- 1060 Duplicate column / 1061 Duplicate key。
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--
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-- 背景：md5 在部分历史库中是 TEXT 类型，MySQL 不允许对 TEXT/BLOB 建整列索引，
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-- 因此 idx_file_dedup 使用前缀长度 md5(32)（MD5 十六进制串固定 32 字符，等价全值）。
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DROP PROCEDURE IF EXISTS `yz_alter_system_files_storage`;
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DELIMITER $$
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CREATE PROCEDURE `yz_alter_system_files_storage`()
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BEGIN
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DECLARE v_db VARCHAR(64);
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SET v_db = DATABASE();
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-- 1. 字段：source
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IF NOT EXISTS (
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SELECT 1 FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = v_db AND TABLE_NAME = 'yz_system_files' AND COLUMN_NAME = 'source'
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) THEN
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ALTER TABLE `yz_system_files`
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ADD COLUMN `source` varchar(16) NOT NULL DEFAULT 'backend'
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COMMENT '来源端: backend-租户后台 platform-平台端';
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END IF;
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-- 2. 字段：scope
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IF NOT EXISTS (
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SELECT 1 FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = v_db AND TABLE_NAME = 'yz_system_files' AND COLUMN_NAME = 'scope'
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) THEN
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ALTER TABLE `yz_system_files`
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ADD COLUMN `scope` varchar(16) NOT NULL DEFAULT 'tenant'
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COMMENT '归属: tenant-租户共享 user-用户个人';
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END IF;
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-- 3. 字段：storage
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IF NOT EXISTS (
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SELECT 1 FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = v_db AND TABLE_NAME = 'yz_system_files' AND COLUMN_NAME = 'storage'
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) THEN
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ALTER TABLE `yz_system_files`
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ADD COLUMN `storage` varchar(16) NOT NULL DEFAULT ''
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COMMENT '存储类型: local/qiniu（冗余，便于迁移与排查）';
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END IF;
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-- 4. 字段：object_key
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IF NOT EXISTS (
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SELECT 1 FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = v_db AND TABLE_NAME = 'yz_system_files' AND COLUMN_NAME = 'object_key'
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) THEN
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ALTER TABLE `yz_system_files`
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ADD COLUMN `object_key` varchar(512) NOT NULL DEFAULT ''
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COMMENT '存储相对路径(不含域名)，用于迁移与精确删除';
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END IF;
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-- 5. 索引：查重（source + scope + tid + tuid + md5 前缀）
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-- 不加 UNIQUE：软删(delete_time)与并发上传下唯一索引会直接报错，去重在代码层完成
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IF NOT EXISTS (
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SELECT 1 FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = v_db AND TABLE_NAME = 'yz_system_files' AND INDEX_NAME = 'idx_file_dedup'
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) THEN
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ALTER TABLE `yz_system_files`
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ADD KEY `idx_file_dedup` (`source`, `scope`, `tid`, `tuid`, `md5`(32));
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END IF;
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-- 6. 索引：归属列表过滤
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IF NOT EXISTS (
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SELECT 1 FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = v_db AND TABLE_NAME = 'yz_system_files' AND INDEX_NAME = 'idx_file_owner'
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) THEN
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ALTER TABLE `yz_system_files`
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ADD KEY `idx_file_owner` (`source`, `tid`, `scope`, `tuid`, `delete_time`);
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END IF;
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END$$
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DELIMITER ;
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CALL `yz_alter_system_files_storage`();
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DROP PROCEDURE IF EXISTS `yz_alter_system_files_storage`;
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-- 7. 老数据初始化：迁移脚本执行前先打底，避免 source/scope 为空导致查询遗漏
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UPDATE `yz_system_files` SET `source` = 'backend' WHERE `source` = '' OR `source` IS NULL;
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UPDATE `yz_system_files` SET `scope` = 'tenant' WHERE `scope` = '' OR `scope` IS NULL;
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-- 8. 校验（应看到 4 个字段 + 2 个索引）
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-- SHOW COLUMNS FROM yz_system_files LIKE 'source';
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-- SHOW COLUMNS FROM yz_system_files LIKE 'scope';
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-- SHOW COLUMNS FROM yz_system_files LIKE 'storage';
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-- SHOW COLUMNS FROM yz_system_files LIKE 'object_key';
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-- SHOW INDEX FROM yz_system_files WHERE Key_name IN ('idx_file_dedup','idx_file_owner');
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