-- =============================================================
-- OA日程表补齐「顺延 / 相关图片 / 提醒绑定」字段：yz_backend_oa_schedule
-- 变更：
--   source_id     bigint unsigned NOT NULL DEFAULT 0  顺延来源日程ID 0-原始日程
--   carry_over    tinyint NOT NULL DEFAULT 0          是否已顺延到下一天 0-否 1-是
--   carry_count   int NOT NULL DEFAULT 0              累计顺延次数
--   carry_to_date varchar(10) NOT NULL DEFAULT ''     顺延目标日期(YYYY-MM-DD)
--   images        text NULL                           相关图片JSON数组 [{"id":1,"url":"","name":""}]
--   reminder_id   bigint unsigned NOT NULL DEFAULT 0  绑定的提醒任务ID(对应 yz_backend_schedule.id) 0-无提醒
-- 本脚本可重复执行：列不存在时才执行 ALTER，已存在自动跳过（不再报 1060 Duplicate column）。
-- 运行：mysql -h<host> -P<port> -u<user> -p <db> < alter_oa_schedule_carry_columns.sql
-- =============================================================

-- source_id：顺延来源日程ID
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule' AND COLUMN_NAME = 'source_id');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_oa_schedule` ADD COLUMN `source_id` bigint unsigned NOT NULL DEFAULT 0 COMMENT ''顺延来源日程ID 0-原始日程''', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- carry_over：是否已顺延到下一天
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule' AND COLUMN_NAME = 'carry_over');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_oa_schedule` ADD COLUMN `carry_over` tinyint NOT NULL DEFAULT 0 COMMENT ''是否已顺延到下一天 0-否 1-是''', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- carry_count：累计顺延次数
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule' AND COLUMN_NAME = 'carry_count');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_oa_schedule` ADD COLUMN `carry_count` int NOT NULL DEFAULT 0 COMMENT ''累计顺延次数''', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- carry_to_date：顺延目标日期
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule' AND COLUMN_NAME = 'carry_to_date');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_oa_schedule` ADD COLUMN `carry_to_date` varchar(10) NOT NULL DEFAULT '''' COMMENT ''顺延目标日期(YYYY-MM-DD)''', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- images：相关图片
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule' AND COLUMN_NAME = 'images');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_oa_schedule` ADD COLUMN `images` text NULL COMMENT ''相关图片JSON数组 [{id,url,name}]''', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- reminder_id：绑定的提醒任务ID
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_oa_schedule' AND COLUMN_NAME = 'reminder_id');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_oa_schedule` ADD COLUMN `reminder_id` bigint unsigned NOT NULL DEFAULT 0 COMMENT ''绑定的提醒任务ID(对应yz_backend_schedule.id) 0-无提醒''', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;