优化backend端相关功能

sql/alter_contact_add_qq.sql

@@ -0,0 +1,42 @@
+-- 通讯录表新增 QQ 字段
+-- 对应模型：go/models/contact.go BackendErpContact
+--
+-- 说明：历史迁移 alter_contact_rename_to_global.sql 把表名从 yz_backend_erp_contact
+-- 改名为 yz_backend_contact，但模型 BackendErpContact.TableName() 仍返回旧表名。
+-- 为避免不同环境表名不一致导致字段加不上，这里按实际存在的表逐个补齐，可重复执行。
+
+SET @db := DATABASE();
+
+-- 旧表名（模型当前使用的表名）
+SET @tbl := 'yz_backend_erp_contact';
+SET @table_exists := (
+  SELECT COUNT(*) FROM information_schema.TABLES
+  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = @tbl
+);
+SET @column_exists := (
+  SELECT COUNT(*) FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = @tbl AND COLUMN_NAME = 'qq'
+);
+SET @sql := IF(@table_exists > 0 AND @column_exists = 0,
+  CONCAT('ALTER TABLE `', @tbl, '` ADD COLUMN `qq` VARCHAR(20) NULL COMMENT ''QQ号'' AFTER `wechat`'),
+  'SELECT 1');
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 新表名（执行过改名迁移的环境）
+SET @tbl := 'yz_backend_contact';
+SET @table_exists := (
+  SELECT COUNT(*) FROM information_schema.TABLES
+  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = @tbl
+);
+SET @column_exists := (
+  SELECT COUNT(*) FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = @tbl AND COLUMN_NAME = 'qq'
+);
+SET @sql := IF(@table_exists > 0 AND @column_exists = 0,
+  CONCAT('ALTER TABLE `', @tbl, '` ADD COLUMN `qq` VARCHAR(20) NULL COMMENT ''QQ号'' AFTER `wechat`'),
+  'SELECT 1');
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;