修改计费文档，加上客户代码

bms-back/sql/price/billing_task_customer_code_alter.sql

@@ -0,0 +1,26 @@
+-- prc_billing_task add customer_code for customer filter / rebill
+SET NAMES utf8mb4;
+
+SET @col := (
+  SELECT COLUMN_NAME FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'prc_billing_task'
+    AND COLUMN_NAME = 'customer_code'
+  LIMIT 1
+);
+SET @sql := IF(
+  @col IS NULL,
+  CONCAT(
+    'ALTER TABLE prc_billing_task ADD COLUMN customer_code varchar(50) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT ',
+    CHAR(39), '客户代码', CHAR(39),
+    ' AFTER order_no, ADD KEY idx_billing_task_customer (customer_code)'
+  ),
+  'SELECT 1'
+);
+PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;
+
+UPDATE prc_billing_task t
+INNER JOIN prc_order_bill b ON b.bill_id = t.bill_id
+SET t.customer_code = b.customer_code
+WHERE (t.customer_code IS NULL OR t.customer_code = '')
+  AND b.customer_code IS NOT NULL AND b.customer_code <> '';