更新若干事项
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-- ============================================================
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-- OA 工作排班：排班方案支持「平台模板 + 周期规则」
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--
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-- 适用：已执行过 create_oa_scheduling.sql 的环境（表已存在）。
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-- 执行：在业务库（go-platform）下整段执行即可。
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--
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-- 幂等：逐列判断 information_schema，只添加缺失的列；
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-- 9 列全部存在时自动跳过一次无害查询，不会报 1060。
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--
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-- 字段说明：
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-- template_id / template_code / template_name
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-- 方案来源模板的快照。租户调用模板后，模板规则会复制进本方案，
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-- 之后模板调整或停用都不影响已保存方案（platform 模板只读，租户可改自己的）。
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-- align_mode
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-- 0 = 未使用模板（沿用 weekdays + shift_id 的按星期排班）
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-- 1 = 按自然周（双休 / 单休 / 大小周）
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-- 2 = 从 start_date 起滚动（三班倒 / 做一休一）
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-- 3 = 按自然月（月休）
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-- cycle_days 周期天数（align_mode=1/2 时等于 pattern 长度）
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-- week_offset 大小周起始周偏移：0=开始日期所在周为周期第 1 周，1=第 2 周
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-- month_rest_days 月休：每月休息天数
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-- month_rest_weekday 月休固定休息周几（1-7），0 表示不固定
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-- pattern 周期规则 JSON 快照，元素形如
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-- {"day_index":0,"day_type":1,"shift_id":12,"shift_name":"白班",
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-- "short_name":"白","color":"#409EFF","work_start":"09:00","work_end":"18:00"}
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-- ============================================================
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-- 执行前自查：existing_cols = 9 表示字段已齐全，执行到下面会自动跳过
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SELECT COUNT(*) AS existing_cols
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FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'yz_backend_oa_schedule_plan'
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AND COLUMN_NAME IN ('template_id','template_code','template_name','align_mode','cycle_days','week_offset','month_rest_days','month_rest_weekday','pattern');
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SET @sql := CONCAT('ALTER TABLE `yz_backend_oa_schedule_plan` ',
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'template_id') = 0,
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'ADD COLUMN `template_id` BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT ''来源模板ID（0=未使用模板）'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'template_code') = 0,
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'ADD COLUMN `template_code` VARCHAR(50) NOT NULL DEFAULT '''' COMMENT ''来源模板编码快照'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'template_name') = 0,
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'ADD COLUMN `template_name` VARCHAR(50) NOT NULL DEFAULT '''' COMMENT ''来源模板名称快照'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'align_mode') = 0,
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'ADD COLUMN `align_mode` TINYINT NOT NULL DEFAULT 0 COMMENT ''0不使用模板 1按自然周 2按开始日滚动 3按自然月'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'cycle_days') = 0,
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'ADD COLUMN `cycle_days` SMALLINT NOT NULL DEFAULT 0 COMMENT ''周期天数'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'week_offset') = 0,
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'ADD COLUMN `week_offset` TINYINT NOT NULL DEFAULT 0 COMMENT ''大小周起始周偏移'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'month_rest_days') = 0,
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'ADD COLUMN `month_rest_days` TINYINT NOT NULL DEFAULT 0 COMMENT ''月休天数'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'month_rest_weekday') = 0,
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'ADD COLUMN `month_rest_weekday` TINYINT NOT NULL DEFAULT 0 COMMENT ''月休固定周几（1-7，0不固定）'', ', ''),
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IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule_plan' AND COLUMN_NAME = 'pattern') = 0,
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'ADD COLUMN `pattern` TEXT NULL COMMENT ''周期规则JSON快照'', ', '')
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);
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-- 去掉结尾多余的 ", "（两个字符），否则 ALTER 语句会因尾逗号报 1064
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SET @sql := IF(RIGHT(@sql, 2) = ', ', LEFT(@sql, CHAR_LENGTH(@sql) - 2), @sql);
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-- 没有任何缺失列时，@sql 只剩表名，替换为一条无害语句
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SET @sql := IF(RIGHT(@sql, 6) = 'TABLE ', 'SELECT 1 AS skipped_all_columns_exist', @sql);
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PREPARE stmt FROM @sql;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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-- 核对结果：应返回 9 行
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SELECT COLUMN_NAME, COLUMN_TYPE, COLUMN_DEFAULT, COLUMN_COMMENT
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FROM information_schema.COLUMNS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'yz_backend_oa_schedule_plan'
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AND COLUMN_NAME IN ('template_id','template_code','template_name','align_mode','cycle_days','week_offset','month_rest_days','month_rest_weekday','pattern')
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ORDER BY ORDINAL_POSITION;
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