jdbc执行SqlServer语句提示：不支持“variant”数据类型。

下面是sql语句：
SELECT

表名 =case when a .colorder= 1 then d.name else '' end ,

表说明 =case when a .colorder= 1 then isnull(f .value, '') else '' end,

字段序号 =a. colorder,

字段名 =a. name,

标识 =case when COLUMNPROPERTY ( a .id, a.name ,'IsIdentity')= 1 then '√' else '' end ,

主键 =case when exists( SELECT 1 FROM sysobjects where xtype ='PK' and name in (

SELECT name FROM sysindexes WHERE indid in(

SELECT indid FROM sysindexkeys WHERE id = a .id AND colid =a. colid

))) then '√ ' else '' end,

类型 =b. name,

占用字节数 =a. length,

长度 =COLUMNPROPERTY( a.id ,a. name,'PRECISION' ),

小数位数 =isnull( COLUMNPROPERTY(a .id, a.name ,'Scale'), 0),

允许空 =case when a .isnullable= 1 then '√' else '' end,

默认值 =isnull( e.text ,''),

字段说明 =isnull( g.[value] ,'')

FROM syscolumns a

left join systypes b on a. xusertype=b .xusertype

inner join sysobjects d on a. id=d .id and d .xtype= 'U' and d.name <>'dtproperties'

left join syscomments e on a. cdefault=e .id

left join sys. extended_properties g on a.id =g. major_id and a.colid =g. minor_id

left join sys. extended_properties f on d.id =f. major_id and f. minor_id=0

where d .name= 'test' -- 如果只查询指定表 ,加上此条件

order by a. id,a .colorder