MybatisPlus整合SqlServer遇到的坑

1. mybatis使用union的坑

           select *
       from ( select wod.Qty as qty,wod.Title as title,wod.Spec as spec,wod.TypeId as typeId,wod.PId as pid,
       wps.productName,wps.productNum,wod.OrderId,wod.OrderNum
       from order_detail wod
       left join ( select proid,cnname as productName,casno as productNum
       from product_2
       ) wps on wod.PId = wps.proid and wod.TypeId = 0 where OrderId = #{searchQuery.orderId} and wod.TypeId = 0
       union
       select wod.Qty as qty,wod.Title as title,wod.Spec as spec,wod.TypeId as typeId,wod.PId as pid,
       wb.productName,wb.productNum,wod.OrderId,wod.OrderNum
       from order_detail wod
       left join ( select Id,concat('北京市',Bnccid) as productNum,productName
       from product_1
       ) wb on wod.PId = wb.Id and wod.TypeId = 3 where OrderId = #{searchQuery.orderId} and wod.TypeId = 3
       ) t where t.productName like concat('%',#{searchQuery.productName},'%')
   

   需要注意的是union上下查詢字段名稱需要一致。最後將查詢的結果作爲臨時表進行查詢。否則，mybatis在進行插件改寫會認爲這是兩個SQL。
2. mybatis在使用sqlserver查詢主鍵的坑
   如果sqlserver在設置主鍵自增後，則不可以通過程序設置主鍵。可以通過以下sql獲取下一個自增主鍵：

   select ident_current('tablename') + 1
   

3. getter/setter方法
   切記符合駝峯轉換命名規範。