优化

deploy/sql/migrations/cn/baiyue_file/V1__align_schema_baseline.sql

@@ -8,13 +8,17 @@ SET NAMES utf8mb4;
 
 SET @guard = IF(
   EXISTS (SELECT 1 FROM file_object WHERE CHAR_LENGTH(business_type) > 32 LIMIT 1),
-  'SIGNAL SQLSTATE ''45000'' SET MESSAGE_TEXT = ''file_object.business_type exceeds 32 characters''',
+  'SELECT 1 FROM migration_blocked_file_business_type_exceeds_32_chars',
   'SELECT 1'
 );
 PREPARE stmt FROM @guard; EXECUTE stmt; DEALLOCATE PREPARE stmt;
 
-ALTER TABLE file_object
-  MODIFY COLUMN business_type varchar(32) DEFAULT NULL COMMENT '关联业务类型';
+SET @ddl = IF(
+  EXISTS (SELECT 1 FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'file_object' AND column_name = 'business_type' AND (column_type <> 'varchar(32)' OR is_nullable <> 'YES')),
+  'ALTER TABLE file_object MODIFY COLUMN business_type varchar(32) DEFAULT NULL COMMENT ''关联业务类型''',
+  'SELECT 1'
+);
+PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;
 
 CREATE TABLE IF NOT EXISTS file_pda_release_channel (
   app_code varchar(16) NOT NULL,