sqlserver查询表字段描述（转）

原文地址：https://blog.csdn.net/changhong009/article/details/29587063

--快速查看表结构（比较全面的）
SELECT  CASE WHEN col.colorder = 1 THEN obj.name
                  ELSE ''
             END AS 表名,
        col.colorder AS 序号 ,
        col.name AS 列名 ,
        ISNULL(ep.[value], '') AS 列说明 ,
        t.name AS 数据类型 ,
        col.length AS 长度 ,
        ISNULL(COLUMNPROPERTY(col.id, col.name, 'Scale'), 0) AS 小数位数 ,
        CASE WHEN COLUMNPROPERTY(col.id, col.name, 'IsIdentity') = 1 THEN '√'
             ELSE ''
        END AS 标识 ,
        CASE WHEN EXISTS ( SELECT   1
                           FROM     dbo.sysindexes si
                                    INNER JOIN dbo.sysindexkeys sik ON si.id = sik.id
                                                              AND si.indid = sik.indid
                                    INNER JOIN dbo.syscolumns sc ON sc.id = sik.id
                                                              AND sc.colid = sik.colid
                                    INNER JOIN dbo.sysobjects so ON so.name = si.name
                                                              AND so.xtype = 'PK'
                           WHERE    sc.id = col.id
                                    AND sc.colid = col.colid ) THEN '√'
             ELSE ''
        END AS 主键 ,
        CASE WHEN col.isnullable = 1 THEN '√'
             ELSE ''
        END AS 允许空 ,
        ISNULL(comm.text, '') AS 默认值
FROM    dbo.syscolumns col
        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
        inner JOIN dbo.sysobjects obj ON col.id = obj.id
                                         AND obj.xtype = 'U'
                                         AND obj.status >= 0
        LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id
        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                      AND col.colid = ep.minor_id
                                                      AND ep.name = 'MS_Description'
        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                         AND epTwo.minor_id = 0
                                                         AND epTwo.name = 'MS_Description'
WHERE   obj.name = 'TableName'--表名
ORDER BY col.colorder ;  

查询列名，列说明，数据类型

<select id="findTableInfo" parameterType="String" resultType="Map">
        SELECT  obj.name AS tableName,
                col.name AS columnName ,
                CONVERT(nvarchar(50),ISNULL(ep.[value], col.name)) as columnDescribe ,
                t.name AS dataType
        FROM    dbo.syscolumns col
                LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
                inner JOIN dbo.sysobjects obj ON col.id = obj.id
                                                 AND obj.xtype = 'U'
                                                 AND obj.status >= 0
                LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id
                LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                              AND col.colid = ep.minor_id
                                                              AND ep.name = 'MS_Description'
                LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                                 AND epTwo.minor_id = 0
                                                                 AND epTwo.name = 'MS_Description'
        WHERE   obj.name = #{tableName}
        ORDER BY col.colorder
    </select>