/*******************字段添加注释*********************/ 

if not exists (SELECT
C.value AS column_description
FROM sys.tables A
INNER JOIN sys.columns B ON B.object_id = A.object_id
INNER JOIN sys.extended_properties C ON C.major_id = B.object_id AND C.minor_id = B.column_id
WHERE A.name = N‘表名‘ and B.name=N‘字段名‘)
   EXEC sys.sp_addextendedproperty @name=N‘MS_Description‘, @value=http://www.mamicode.com/N‘字段注释‘ , @level0type=N‘SCHEMA‘,@level0name=N‘dbo‘, @level1type=N‘TABLE‘,@level1name=N‘表名‘, @level2type=N‘COLUMN‘,@level2name=N‘字段名‘>