How Do I Select Particular Data From Sql Database In C#?

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hello guys,
below is my sql select statement :

SQL

SELECT product.P_ID, Product.P_Name,Product.Leadtime, Product.SafetyStockamount,
Monthlysales.Month, Monthlysales.totalsalesamount, (totalsalesamount/30) as Averagedailysales, ((totalsalesamount/30) * Leadtime + SafetyStockamount) as reorderpoint
FROM Product, Monthlysales
where Product.P_ID = Monthlysales.P_ID

in product table there are product id, name, lead time, safety stock column, meanwhile in monthly sales table, there are productid, month (in int), and totalsalespermonth.

the problem is :

i want to retrieve the reorder point result from the select statement above in visual studio c#
the interface will include product id , month options, button and label to show the result.
the reorder point result will be based on the month, for example
if the user choose
pid 1 : 1
month options: 2 (february)
then label result will show the reorder point amount for pid 1 in february.

i also wondering whether i can directly calculate the reorder point result based on product id and its month in sql server and directly call it in c#.

how could i do it?? please help me
thank you

Posted 10-May-14 17:59pm

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Updated 10-May-14 18:01pm

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DamithSL · Accepted Answer · 2014-05-10T18:28:00

you need to use parameters in your where condition as below

SQL

SELECT product.P_ID, Product.P_Name,Product.Leadtime, Product.SafetyStockamount,
Monthlysales.Month, Monthlysales.totalsalesamount, (totalsalesamount/30) as Averagedailysales, ((totalsalesamount/30) * Leadtime + SafetyStockamount) as reorderpoint
FROM Product, Monthlysales
where Product.P_ID = Monthlysales.P_ID AND Product.P_ID =@P_ID AND Monthlysales.Month =@Month

C# code:

C#

using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();

    using (SqlCommand command = new SqlCommand(
    "SELECT product.P_ID, Product.P_Name,Product.Leadtime, Product.SafetyStockamount," +
    "Monthlysales.Month, Monthlysales.totalsalesamount, (totalsalesamount/30) as Averagedailysales, ((totalsalesamount/30) * Leadtime + SafetyStockamount) as reorderpoint " +
    "FROM Product, Monthlysales "+
    "where Product.P_ID = Monthlysales.P_ID AND Product.P_ID =@P_ID AND Monthlysales.Month =@Month ", connection))
    {

        command.Parameters.Add(new SqlParameter("P_ID", pid));
        command.Parameters.Add(new SqlParameter("Month", month));
        SqlDataAdapter adapter = new SqlDataAdapter(command);
        DataSet ds = new DataSet();
        adapter.Fill(ds);
        // now you have the data in Dataset ds
    }
}