auto generated sequence number

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Actually i want to create the auto generated text_id. it should be a sequence number and should be unique. i need the code for that. pls help.
for example if the table is empty means the text_id should be 0001. if the entities are there means should add 1 to the last value.
Ms Sql database
con.Open();
SqlCommand cmd = new SqlCommand("count(text_id), sum(text_id) from text_data", con);
SqlDataReader r1 = default(SqlDataReader);
DataSet ds =new DataSet();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
// float a = 1;
float increment_id;
r1 = cmd.ExecuteReader();
r1.Read();

//da = r1.Read();

if(r1[0]==0)
{

increment_id = 1;
}
else
{

//r1.MoveLast;
// r1.NextResult();

increment_id = int.parse(dr[0].toString()) + 1;
}
this s my code what is the change i want to do.

Posted 8-Mar-10 1:17am

ramyaaksh

Updated 8-Mar-10 1:51am

v3

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radix3 · Answer 1 · 2010-03-08T01:35:00

Solution 1

is database coming into action do reply

Posted 8-Mar-10 1:35am

radix3

Indrajeet Sutar · Answer 2 · 2010-03-08T01:39:00

use following instructions

count(text_id), sum(text_id) from tablename

execute this query you will get 1 row with values

now check if ...

if dr[0]==o then 
increment_id=1
else
increment_id= int.parse(dr[1].toString())+1;

and then comes your insert code

insert into tablename values(increment_id,.....)

Happy coding

Indrajeet Sutar · Answer 3 · 2010-03-08T02:04:00

your code is correct just make some change

remove

C#

r1.Read();
//da = r1.Read();
if(r1[0]==0)
{
increment_id = 1;
}
else
{
//r1.MoveLast;
// r1.NextResult();
increment_id = int.parse(dr[0].toString()) + 1;
}

and add

if r1.hasrows();
while (r1.read())
{
    if (r1[0].tostring()=="0")
    {
      increment_id=1
    }
    else
    {
        int.parse(r1[1].toString()) + 1;
    }
}

Now, there will not be error, but still any error occurs then give deals about error....

auto generated sequence number

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