select * from TableName where index_field_name = [要插入记录的唯一索引字段值] 如果记录数大于0,则表示表中已存在该索引
查看一下sysobjects 的 xtype對就相關表的屬性. xtype= 'D' 表示indexif exists(select * from sysobjects where name='%table%' and xtype='PK')
sql中可使用sp_pkeys:with ado1 do begin close; sql.text:= 'exec sp_pkeys res_hr_rsqj ; open; if recordcount > 0 then showmessage('存在PK'); close; ...... end;
sql中還可以這樣: 2:利用系統表INFORMATION_SCHEMA.KEY_COLUMN_USAGE SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_NAME= '表名 ' 3: 以下這個查詢表結構的語句可能大家都見過: 利用syscolumns,sysindexes,sysindexkeys三個表關聯可以查出主鍵 SELECT (case when a.colorder=1 then d.name else ' ' end) N '表名 ', a.colorder N '欄位序號 ', a.name N '欄位名 ', (case when COLUMNPROPERTY( a.id,a.name, 'IsIdentity ')=1 then '√ 'else ' ' end) N '標識 ', (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) N '主鍵 ', b.name N '類型 ', a.length N '佔用位元組數 ', COLUMNPROPERTY(a.id,a.name, 'PRECISION ') as N '長度 ', isnull(COLUMNPROPERTY(a.id,a.name, 'Scale '),0) as N '小數位數 ', (case when a.isnullable=1 then '√ 'else ' ' end) N '允許空 ', isnull(e.text, ' ') N '預設值 ', isnull(g.[value], ' ') AS N '欄位說明 ' --into ##tx 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 order by object_name(a.id),a.colorder 4: select o.name as 表名,c.name as 欄位名,k.colid as 欄位序號,k.keyno as 索引順序 from sysindexes i join sysindexkeys k on i.id = k.id and i.indid = k.indid join sysobjects o on i.id = o.id join syscolumns c on i.id=c.id and k.colid = c.colid where o.xtype = 'U ' and exists(select 1 from sysobjects where xtype = 'PK ' and name = i.name) order by o.name,k.colid
with adoquery1 do
begin
close;
sql.text:= 'exec sp_pkeys yourtablename';
open;
if recordcount <> 0 then showmessage('有');
close;
end;
手写,未测,应该没什么问题
exec sp_statistics table1
如果记录数大于0,则表示表中已存在该索引
begin
close;
sql.text:= 'exec sp_pkeys res_hr_rsqj ;
open;
if recordcount > 0 then showmessage('存在PK');
close;
......
end;
2:利用系統表INFORMATION_SCHEMA.KEY_COLUMN_USAGE SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE TABLE_NAME= '表名 ' 3: 以下這個查詢表結構的語句可能大家都見過: 利用syscolumns,sysindexes,sysindexkeys三個表關聯可以查出主鍵 SELECT
(case when a.colorder=1 then d.name else ' ' end) N '表名 ',
a.colorder N '欄位序號 ',
a.name N '欄位名 ',
(case when COLUMNPROPERTY( a.id,a.name, 'IsIdentity ')=1 then '√ 'else ' ' end) N '標識 ',
(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) N '主鍵 ',
b.name N '類型 ',
a.length N '佔用位元組數 ',
COLUMNPROPERTY(a.id,a.name, 'PRECISION ') as N '長度 ',
isnull(COLUMNPROPERTY(a.id,a.name, 'Scale '),0) as N '小數位數 ',
(case when a.isnullable=1 then '√ 'else ' ' end) N '允許空 ',
isnull(e.text, ' ') N '預設值 ',
isnull(g.[value], ' ') AS N '欄位說明 '
--into ##tx 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
order by object_name(a.id),a.colorder
4:
select o.name as 表名,c.name as 欄位名,k.colid as 欄位序號,k.keyno as 索引順序 from sysindexes i
join sysindexkeys k on i.id = k.id and i.indid = k.indid
join sysobjects o on i.id = o.id
join syscolumns c on i.id=c.id and k.colid = c.colid
where o.xtype = 'U '
and exists(select 1 from sysobjects where xtype = 'PK ' and name = i.name)
order by o.name,k.colid