-- =============================================================
-- CRM 回款计划：流水回执（receipt）字段
-- 说明：
--   回款登记支持上传「流水回执」（银行流水 / 转账凭证等），非必填。
--   新增两列用于保存回执文件地址与文件名，随回款计划主表一并存取。
--   文件本身经 /backend/uploadfile 上传到文件存储，此处仅存其可访问地址。
-- =============================================================

-- 回款计划表：流水回执地址 + 文件名（均允许为空）
-- 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）。

-- receipt_url
SET @tbl := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_crm_payback');
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_crm_payback' AND COLUMN_NAME = 'receipt_url');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_crm_payback` ADD COLUMN `receipt_url` VARCHAR(512) NULL COMMENT ''流水回执文件地址（选填）'' AFTER `remark`', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- receipt_name
SET @col := (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'yz_backend_crm_payback' AND COLUMN_NAME = 'receipt_name');
SET @ddl := IF(@tbl > 0 AND @col = 0, 'ALTER TABLE `yz_backend_crm_payback` ADD COLUMN `receipt_name` VARCHAR(255) NULL COMMENT ''流水回执文件名（选填）'' AFTER `receipt_url`', 'DO 0');
PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;