i am trying to get recently inserted primary key and display on label, primary key is teacher_id which is identity, I am using ExecuteScalar() method but it gives me number rows in table here is...

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C#

cmd.CommandText = "SELECT COUNT(Teacher_id) from Teacher";
               int newid = (int)cmd.ExecuteScalar();
               Label8.Text = "your Teacher_id is  "+Convert.ToString(newid);

//and also tried for

C#

cmd.CommandText = "SELECT MAX(Teacher_id) from Teacher";
               int newid = (int)cmd.ExecuteScalar();
               Label8.Text = "your Teacher_id is  "+Convert.ToString(newid);

Posted 3-Mar-14 18:34pm

swati gapat

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Ankur^\m/ 4-Mar-14 0:45am

1st query is certainly going to give you the number of rows in the table. It is doing what it is supposed to do.
I am wondering what's wrong with your second query. It should give you what you want. Are you not getting the correct answer?

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Peter Leow · Answer 1 · 2014-03-03T21:55:00

Check out the following example:

string newid = "";

string sql = "INSERT INTO teachers (name, gender) VALUES (@name, @gender);" +
                    " SELECT SCOPE_IDENTITY();";

using (var con = new SqlConnection("your connection string") )
using (var cmd = new SqlCommand(sql, con)
{
    cmd.Parameters.Add("@name", SqlDbType.VarChar, 100).Value = txtName.Text;
    cmd.Parameters.Add("@gender", SqlDbType.VarChar, 20).Value = txtGender.Text;

    con.Open();
    newid = cmd.ExecuteScalar().ToString();
}

Read more: SCOPE_IDENTITY (Transact-SQL)[^]

george4986 · Answer 2 · 2014-03-03T18:40:00

Solution 1

plz check this link
http://stackoverflow.com/questions/14246744/executescalar-vs-executenonquery-when-returning-an-identity-value[^]

Posted 3-Mar-14 18:40pm

george4986

Jhone2011 · Answer 3 · 2014-03-03T19:33:00

If ur coloumn teacher column is identity than after insert query u have to concate one more query as given below...

Insert into tbl_teacher_mst values(); select cast(scope_identity() as bigint);

you have to execute both query as given sequence using execute scaler method of command class and it will return newely inserted identity value.

ErBhati · Answer 4 · 2014-03-03T20:41:00

Solution 3

C#

use ExecuteNonQuery in second Query

cmd.CommandText = "SELECT MAX(Teacher_id) from Teacher";
               int newid = (int)cmd.ExecuteNonQuery();
               Label8.Text = "your Teacher_id is  "+Convert.ToString(newid);

Posted 3-Mar-14 20:41pm

ErBhati

v2

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ErBhati 4-Mar-14 7:11am

plz select as answer for others if it helps you....

i am trying to get recently inserted primary key and display on label, primary key is teacher_id which is identity, I am using ExecuteScalar() method but it gives me number rows in table here is...

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