How to increment the counter value that is stored in database on a click of a button ?

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There is a column named Quantity in the table. the quantity of available books in the inventory is stored here. When a book is de-assigned from a user the value in Quantity column should increase by 1. This de-assign is performed on a click of a button. How do I perform this?

What I have tried:

I have not tried anything. I thought of creating a procedure to do this. But I do not know how to call the procedure in button click..

Posted 7-Feb-17 23:50pm

Pallavi 24

Updated 8-Feb-17 0:06am

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[no name] 8-Feb-17 6:06am

You can use a stored procedure, or a SELECT and UPDATE from your code. What is the problem?

Pallavi 24 13-Feb-17 5:01am

Conversion failed when converting the varchar value 'System.Windows.Forms.DataGridViewSelectedRowCollection' to data type int.
I get the above error when I use Update statement..
I used the below code,.....
cmd.CommandText = "Update IssueBooks set BookStatus='Returned' where IssueId='"+dataGridView1.SelectedRows+"' ";
I have used a grid view. Based on selection that the user does the table has to be updated..

[no name] 13-Feb-17 5:17am

Firstly, do not use string concatenation to create SQL statements; use parameters. And secondly, look at the data types you are referring to, they must be the same.

Pallavi 24 8-Feb-17 23:47pm

If I create a procedure then how will the procedure be called when the button is called ?

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OriginalGriff · Answer 1 · 2017-02-08T00:06:00

Solution 1

Try:

C#

using (SqlConnection con = new SqlConnection(strConnect))
    {
    con.Open();
    using (SqlCommand cmd = new SqlCommand("UPDATE myTable SET Quantity = Quantity + 1 WHERE BookID = @BI", con))
        {
        cmd.Parameters.AddWithValue("@BI", IdValueForTheRowToSayWhichBookItIs);
        cmd.ExecuteNonQuery();
        }
    }

[EDIT]Forgot the WHERE condition...[/EDIT]

Posted 8-Feb-17 0:06am

OriginalGriff

Updated 8-Feb-17 0:08am

v2

Comments

Pallavi 24 8-Feb-17 23:41pm

The Quantity value should not exceed. I mean if Quantity has been entered as 10 by the librarian then after each increment Quantity value should not exceed 10.
10 is the limit, right.