取数据库所有表及结构

SELECT 
    (case when a.colorder=1 then d.name else '' end) 表名,
    a.colorder 字段序号,
    a.name 字段名,
    (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,
    (case when (SELECT count(*) 
                FROM sysobjects 
                WHERE (name in (SELECT name
                                FROM sysindexes
                                WHERE (id = a.id) AND (indid in (SELECT indid
                                                                 FROM sysindexkeys
                                                                 WHERE (id = a.id) AND (colid in (SELECT colid
                                                                                                  FROM syscolumns
                                                                                                  WHERE (id = a.id) AND (name = a.name)
                                                                                                  )
                                                                                        )
                                                                )
                                                        )
                                )
                        ) AND (xtype = 'PK') 
                ) > 0 then '√' else '' end) 主键,
    b.name 类型,
    a.length 占用字节数,
    COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,
    isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,
    (case when a.isnullable=1 then '√'else '' end) 允许空,
    isnull(e.text,'') 默认值,
    isnull(g.[value],'') AS 字段说明    FROM  syscolumns a 
    left join systypes b on a.xtype=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 sysproperties g on a.id=g.id AND a.colid = g.smallid