在oracle的sqlplus中有一個命令：desc，能夠簡要的顯示基表、視圖等的結構。desc的顯示結果簡單明了，比較實用。雖然在Sybase ASE中的存儲過程sp_help也能實現查看表結構的目的；但是，顯示結果很多尤其換行混亂，讓人看得眼花繚亂。顯示的存儲過程：sp_desc能夠實現oracle的sqlplus中desc相同的功能，僅僅多了一列：列序號。

效果圖如下：

存儲過程sp_desc的語法如下：

------=================================================================================

use sybsystemprocs

go

if exists(select 1 from sybsystemprocs.dbo.sysobjects where type="P" and name="sp_desc")

drop proc sp_desc

go

create procedure sp_desc

@tablename varchar(128)

as

declare @table_id int

declare @char_bin_types?? varchar(30)

set nocount on

begin

select @char_bin_types = char(47)+char(39)+char(45)+char(37)+char(35)+char(34)

select @table_id = object_id(@tablename)

select

"序號"=convert(varchar(3),colid),

"列名"=convert(varchar(30),column_name),

"是否為空?"=convert(varchar(7),nullable),

"類型"=convert(varchar(30),

(case scale

when NULL then

case

when charindex(type_name,",ubigint,tinyint,usmallint,uintn,floatn,smallmoneyn,daten,timen,real,bit,sysname,text,image,smalldatetime,real,longsysname,timestamp,datetimn") > 0 then type_name

else

type_name+"("+convert(varchar,precision)+")"

end

when 0 then

case

when charindex(type_name,",ubigint,tinyint,usmallint,uintn,floatn,smallmoneyn,daten,timen,real,bit,sysname,text,image,smalldatetime,real,longsysname,timestamp,datetimn") > 0 then type_name

else

type_name+"("+convert(varchar,precision)+","+convert(varchar,scale)+")"

end

else

case

when charindex(type_name,",ubigint,tinyint,usmallint,uintn,floatn,smallmoneyn,daten,timen,real,bit,sysname,text,image,smalldatetime,real,longsysname,timestamp,datetimn") > 0 then type_name

else

type_name+"("+convert(varchar,precision)+","+convert(varchar,scale)+")"

end

end

)

)

from

(

SELECT??? /* INTn, FLOATn, DATETIMEn and MONEYn types */

colid = c.colid,

column_name = c.name,

nullable =??? /* set nullability from status flag */

(case convert(smallint, convert(bit, c.status&8)) when 0 then "NOT NULL" else "" end),

type_name = rtrim(substring(isnull(stuff(d.type_name,

(c.status&128)/128,

char_length(d.type_name),

"numeric identity"), d.type_name),

1+isnull(d.aux,

ascii(substring("III<<

2*(d.ss_dtype%35+1)+2-8/c.length,

1))-60), 18)),

"precision" = isnull(convert(int, c.prec),

isnull(convert(int, d.data_precision),

convert(int,c.length)))

+isnull(d.aux, convert(int,

ascii(substring("???AAAFFFCKFOLS",

2*(d.ss_dtype%35+1)+2-8/c.length,1))-60)),

scale = isnull(convert(smallint, c.scale),

convert(smallint, d.numeric_scale))

+convert(smallint,

isnull(d.aux,

ascii(substring("<<<<<<<<<<<<<",

2*(d.ss_dtype%35+1)+2-8/c.length,

1))-60))

FROM

syscolumns c,

sysobjects o,

sybsystemprocs.dbo.spt_datatype_info d,

systypes t

WHERE

o.id = @table_id

AND c.id = o.id

AND c.usertype = t.usertype

AND t.type = d.ss_dtype

AND d.ss_dtype IN (111, 109, 38, 110, 43)??? /* Just *N types */

AND c.usertype < 100??? ??? /* No user defined types */

UNION

SELECT??? /* All other types including user data types */

colid = c.colid,

column_name = c.name,

nullable =??? /* set nullability from status flag */

(case convert(smallint, convert(bit, c.status&8)) when 0 then "NOT NULL" else "" end),

type_name = rtrim(substring(isnull(stuff(d.type_name,

(c.status&128)/128,

char_length(d.type_name),

"numeric identity"), d.type_name),

1+isnull(d.aux,

ascii(substring("III<<

2*(d.ss_dtype%35+1)+2-8/c.length,

1))-60), 18)),

"precision" = isnull(convert(int, c.prec),

isnull(convert(int, d.data_precision),

convert(int,c.length)))

+isnull(d.aux, convert(int,

ascii(substring("???AAAFFFCKFOLS",

2*(d.ss_dtype%35+1)+2-8/c.length,1))-60)),

scale = isnull(convert(smallint, c.scale),

convert(smallint, d.numeric_scale)) +

convert(smallint, isnull(d.aux,

ascii(substring("<<<<<<<<<<<<<",

2*(d.ss_dtype%35+1)+2-8/c.length,

1))-60))

FROM

syscolumns c,

sysobjects o,

sybsystemprocs.dbo.spt_datatype_info d,

systypes t

WHERE

o.id = @table_id

AND c.id = o.id

AND c.usertype = t.usertype

AND t.type = d.ss_dtype

AND (d.ss_dtype NOT IN (111, 109, 38, 110, 43) /* No *N types */

OR c.usertype >= 100) /* User defined types */

) a

ORDER BY colid

end

go

------=================================================================================

存儲過程sp_desc的語法請 ：下載

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