ExecuteScaler for SUM(field)

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Hi all

I wanna Sum field in table as bellow :

C#

DataTable dt = new DataTable();
string query_arr = "SELECT Item_factor, SUM(number_item_factor) AS EX1 FROM Detail_factor_sell GROUP BY Item_factor"; 
db.Query_Select_ExecuteScaler(query_arr);

the query is correct when test in query designer but I want to return two field ( Item_factor , SUM(number_item_factor) ). how do i it??

thanks a lot.

Posted 25-Aug-15 6:15am

bernova

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PIEBALDconsult 25-Aug-15 12:32pm

"Executes the query, and returns the first column of the first row in the resultset returned by the query. " -- https://msdn.microsoft.com/en-us/library/system.data.idbcommand.executescalar(v=vs.110).aspx

I recommend you use a DataReader instead. Others may recommend a DataAdapter, but I don't.

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DamithSL · Accepted Answer · 2015-08-25T07:06:00

you can use SqlDataReader, sample code

C#

using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();
    using (SqlCommand command = new SqlCommand("SELECT top 1 Item_factor, SUM(number_item_factor) AS EX1 FROM Detail_factor_sell GROUP BY Item_factor", connection))
    {
    SqlDataReader reader = command.ExecuteReader();
    if (reader.Read())
    {
        string Item_factor= reader.GetString(0);
        int sumNumber_item_factor= reader.GetInt32(1);
    }
    }
}