打开查询分析器，执行下面的代码就可以了， 不需要修改任何地方。
SELECT sysobjects.name AS 表名, syscolumns.name AS 列名, systypes.name AS 数据类型, syscolumns.length AS 数据长度, CONVERT(char, sysproperties.[value]) AS 注释FROM sysproperties RIGHT OUTER JOINsysobjects INNER JOINsyscolumns ON sysobjects.id = syscolumns.id INNER JOINsystypes ON syscolumns.xtype = systypes.xtype ON sysproperties.id = syscolumns.id AND sysproperties.smallid = syscolumns.colidWHERE (sysobjects.xtype = 'u' ORsysobjects.xtype = 'v') AND (systypes.name <> 'sysname')--and CONVERT(char,sysproperties.[value]) <> 'null' --导出注释不为'null'的记录--AND (sysobjects.name = 'bbs_bank_log') --逐个关联表名，可以用or连接条件ORDER BY 表名
如果需要查询指定表的指定列可以添加查询条件：
and sysobjects.name='指定表名称' and syscolumns.name='指定列名'
修改字段属性：
ALTER TABLE table { [ ALTER COLUMN column_name { new_data_type [ ( precision [ , scale ] ) ] [ COLLATE < collation_name > ] [ NULL | NOT NULL ] | {ADD | DROP } ROWGUIDCOL } ] | ADD { [ < column_definition > ] | column_name AS computed_column_expression } [ ,...n ] | [ WITH CHECK | WITH NOCHECK ] ADD { < table_constraint > } [ ,...n ] | DROP { [ CONSTRAINT ] constraint_name | COLUMN column } [ ,...n ] | { CHECK | NOCHECK } CONSTRAINT { ALL | constraint_name [ ,...n ] } | { ENABLE | DISABLE } TRIGGER { ALL | trigger_name [ ,...n ] } }
