SOS!!TDBChart的应用问题(30分)

E

elepant

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2001-08-21

• #1

用TDBChart做动态曲线，DataSet采用Query1,x轴为time,y轴为value
sql语句为：select time,value from RealTable order by time
RealTable表没有任何索引
设计时将属性TDBChart.RefreshInterval 置为1，但在运行时出现错误“Tabledo
es not
support this operation because it is not uniquely indexed.”
什么原因，怎么解决？请教各位，先谢谢！

 

L

lanchong

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2001-08-24

• #2

建一个索引就好了

 

G

gutian

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2001-08-24

• #3

恩，是因为表刷新的问题。加索引吧

 

E

elepant

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2001-08-26

• #4

索引加过了不起作用！

 

L

liuly

Unregistered / Unconfirmed

GUEST, unregistred user!

• 2002-01-04

• #5

强制结束，请自行验证！