How about incrementing values in a column ?

Question

3.00/5 (2 votes)

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hi am using dynamic in my project
here is my table details
tblBidtree(table)
columns name
btID
btDID
btDocType
btNodeID
btName
btParentNodeID
btType
btDetails
btDelStatus

btNodeID is 4th column

this is the added record in my table
column btNodeID
\/

128	125	YTB1	-1	New 1	0			False
129	125	YTB1	-2	New 1	1	Textbox	dddd	False

this after editng when i add one more node to tree

128	125	TPR1	-1	New 1	0	TextBox	hhh	        False
129	125	TPR1	-2	New 1	1	Textbox	dddd	        False
130	125	TPR1	-1	New 2	0	Textbox	after edit	False

but after editing records to perticular id
should save like this

128	125	TPR1	1	New 1	0 TextBox hhh			False
129	125	TPR1	2	New 1	1	Textbox	dddd	        False
130	125	TPR1	3	New 2	0	TextBox after Edit      False

negative value should positive for btNodeID ..and if btNodeID is 1,2 and it should not repeat again 1 it should increment to 3..like 1,2,3
i want only changes in btNodeID
please suggest me how can i do this in loop or in simple method..

can any one help for this post..

or how can i increment btNodeID like primary key..we can set autoincrement for two columns??

Posted 22-Jul-12 19:35pm

ythisbug

Updated 15-Aug-12 19:48pm

v13

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Sergey Alexandrovich Kryukov 23-Jul-12 1:38am

Makes no sense.
--SA

ythisbug 23-Jul-12 2:00am

i updated my question.thank u

Sergey Alexandrovich Kryukov 27-Jul-12 19:04pm

Better, thank you. I think you already got an answer. Consider accepting it formally (green button).
--SA

ythisbug 28-Jul-12 0:47am

no its not working?i tried tat code

ythisbug 28-Jul-12 2:34am

i just want to increment using compute(max)

2 solutions

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sderen · Answer 1 · 2012-07-22T20:13:00

Solution 2

You can simply multiply all of them by -1 one by one.
And add btNodeID for each item in an array or list.

If a btNodeID already exists in list, find max value of list and make btNodeID = maxValue + 1.

Update:
If I understood question right:

Since you have a dataset, you can do something like following:

C#

DataTable table = dataset.Tables[0];
List<int> list = new List<int>();
foreach (DataRow row in table.Rows)
{
    int btNodeID = int.Parse(row[3].ToString()) * -1;
    if (list.Count > 0 && list.Contains(btNodeID))
    {
        btNodeID = list.Max() + 1;
    }
    list.Add(btNodeID);
    row[3] = btNodeID;
    row.AcceptChanges();
}
table.AcceptChanges();

You probably need to add more control statements though.

Posted 22-Jul-12 20:13pm

sderen

Updated 22-Jul-12 21:25pm

v3

Comments

ythisbug 23-Jul-12 2:40am

thanks sderen. can u suggest me more about this answer..i think in your post i will get answer.

sderen 23-Jul-12 2:55am

You are welcome.
How do you add these datas to database.

Are you trying to apply these changes in .net side(i assume it from tags) or at database side?

I may be able to provide a better answer if you tell me details about these.

ythisbug 23-Jul-12 3:02am

while editing am calling delete function den am inserting data.am using sp to insert data via for loop..and with the help of dataset dtBidtree

ythisbug 23-Jul-12 3:02am

in .net side

sderen 23-Jul-12 3:23am

see my updated answer please.

ythisbug 23-Jul-12 3:25am

sorry not dataset ..datatable dtBidtree

sderen 23-Jul-12 3:26am

No problem.Answer code uses dataset only to get datatable anyway.

ythisbug 23-Jul-12 3:46am

ok thanks i will try

ythisbug 23-Jul-12 4:26am

no its not incrementing know..newly added row adding as 1 only

sderen 23-Jul-12 4:55am

Try to do it after you have done all other changes.(Inserts, updates, deletes etc.)
That code part seems to be doing what you wish for, but it needs to be adapted properly into your code.

ythisbug 23-Jul-12 4:59am

now working small changes have to do row[0]

sderen 23-Jul-12 5:01am

I am glad you have solved.
Have a nice day.

ythisbug 23-Jul-12 5:40am

deren its not adding wat to do..?

ythisbug 23-Jul-12 7:14am

how to use compute method in this answer??

sderen 23-Jul-12 11:56am

You just need to do this operations before saving changes to db.It should still save all the changes, just as before.

ythisbug 24-Jul-12 1:04am

ya same i did before only..

ythisbug 16-Aug-12 2:27am

here am getting error cannot find table 0.

Christian Graus · Answer 2 · 2012-07-22T19:43:00

Solution 1

Your subject line is retarded. Every person asking is hoping someone can answer them. Make it clear what you want.

You increment a value by doing an update instead of an insert and settings the column to be equal to it's value + 1. Your question is somewhat nonsensical, but that seems to be the core of it, and it's really as easy as that. Set the value to what you want it to be, that's how DBs work.

Posted 22-Jul-12 19:43pm

Christian Graus

Comments

ythisbug 23-Jul-12 1:59am

thank you i updated

Christian Graus 23-Jul-12 2:01am

Good lord, just shoot me. That's more useless.

ythisbug 23-Jul-12 2:07am

again wat have to modify graus...??

Christian Graus 23-Jul-12 2:29am

'dont know how to ask question for this?please suggest?' How about incrementing values in a column ? Anything is better than that. It's not about making it pretty, a good subject attracts people who cxan help you.

ythisbug 23-Jul-12 2:33am

ya :) for that only i din knew how to ask so thout reader will suggest me..thank you