fetching max value from a column in oracle table

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my coding is like this

VB

dim quer as string
dim a as integer
dim dr as OracleDataReader

query = select max(refno)+1 from porder;
orc.open()
cmd = New OracleCommand(query1, orc)
dr = cmd.ExecuteReader()
a = dr.read()

each time it is showing the zero(0)

please help and thanks in advance

Posted 17-Jul-11 0:42am

asok6783

Updated 17-Jul-11 0:50am

thatraja

v2

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Uday P.Singh 17-Jul-11 7:04am

I assume that dim quer as string is dim query as string.

1 solution

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Uday P.Singh · Answer 1 · 2011-07-17T00:49:00

Solution 1

try this :

replace this:

SQL

query = select max(refno)+1 from porder;
orc.open()
cmd = New OracleCommand(query1, orc)

with:

SQL

query = select max(refno)+1 from porder;
orc.open()
cmd = New OracleCommand(query, orc)

as you are passing the incorrect query.

hope it helps :)

Posted 17-Jul-11 0:49am

Uday P.Singh

Updated 17-Jul-11 0:50am

v2

Comments

RaisKazi 17-Jul-11 7:02am

Good Catch :). My 5 . Also "ExecuteScalar" can be used here, as this query is always going to return only one value.

Uday P.Singh 17-Jul-11 7:08am

yeah RaisKazi, you are right ExecuteScalar can be used(as this query is always going to return single value). thanks for 5!

asok6783 17-Jul-11 7:12am

ERROR IS NOT THAT IT IS THE TYPING ERROR

Uday P.Singh 17-Jul-11 7:17am

are you getting any error message? if yes then post it, you can always debug your code and check what values you are getting.