SQL MAX Function

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Hello,

I am trying to get the highest value from my custID column in my Customer table and to then save this out to an integer.

VB

Dim getHighAccountNo As SqlCommand = AccountsTableAdapter.Connection.CreateCommand()

        getHighAccountNo.CommandType = CommandType.Text

        custID = getHighAccountNo.CommandText = "SELECT MAX(custID) AS HighestAccountID FROM Customer"

        'custID = getHighAccountNo.CommandText = "SELECT IDENT_CURRENT('Customer') as LastIdentity"

        lblHighestAccountNo.Text = custID.ToString()

I'm not sure what I have done wrong as the code above always returns 0.

Any help is appreciated,

Thanks Glen.

Posted 24-Jan-14 0:23am

Glen Childs

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3 solutions

Solution 3

Thanks guys! That worked! I am silly! Should have noticed that one!

Thanks again!

Posted 24-Jan-14 0:38am

Glen Childs

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phil.o · Accepted Answer · 2014-01-24T00:26:00

You define the command text, but I cannot see where you actually execute the command and fetch its result.

Maybe:

C#

getHighAccountNo.CommandText = "SELECT MAX(custID) AS HighestAccountID FROM Customer"
int cutomerId = getHighAccountNo.ExecuteScalar();
lblHighestAccountNo.Text = customerId.ToString();

Hope this helps.

vini2k1 · Accepted Answer · 2014-01-24T00:34:00

You are missing "ExecuteScalar". The code below should do!

VB

Dim getHighAccountNo As SqlCommand = AccountsTableAdapter.Connection.CreateCommand()

        getHighAccountNo.CommandType = CommandType.Text

        getHighAccountNo.CommandText = "SELECT MAX(custID) AS HighestAccountID FROM Customer"
        custID = getHighAccountNo.ExecuteScalar()

        'custID = getHighAccountNo.CommandText = "SELECT IDENT_CURRENT('Customer') as LastIdentity"

         
        lblHighestAccountNo.Text = custID.ToString()

SQL MAX Function

3 solutions

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Solution 2

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