updating stock values based on the stock in/out value in vb.net

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Hi,
Let me go directly to my problem. Here is the explanation.
I want to update the value of stock level based on the stock in and stock out. the current quantity of the stock should change if user update the value of the stock in or stock out. Currently, i only can update the value based on the 1 situation whether it is value of stock in or stock out. Is there any possible coding/way that i should try?
this my coding for updating :

XML

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
            ConnectionString="<%$ ConnectionStrings:INVENTORY.MDFConnectionString %>"
            SelectCommand="SELECT Inventory.*, StokIn.QtyIn FROM Inventory INNER JOIN StokIn ON Inventory.MedicineId = StokIn.MedicineId"
            UpdateCommand="UPDATE Inventory SET CurrentQty = Inventory.CurrentQty + StokIn.QtyIn FROM Inventory INNER JOIN StokIn ON Inventory.MedicineId = StokIn.MedicineId">
        </asp:SqlDataSource>

Is there any possibility for me to combine the "-" arithmetic to calculate the current quantity once the user update the Stock out value? Thanks in advance

Posted 3-Apr-11 5:37am

sugababes4

Updated 1-Mar-21 9:15am

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MarqW · Accepted Answer · 2011-04-03T07:31:00

Solution 1

So you want to add the in and subtract the out in a single SQL statement?

Not sure of your schema, but something like this will work

SQL

UPDATE Inventory
SET CurrentQty = Inventory.CurrentQty + IsNull(StokIn.QtyIn, 0) - IsNull(StokOut.QtyOut, 0)
FROM Inventory
 LEFT JOIN StokIn ON Inventory.MedicineId = StokIn.MedicineId
 LEFT JOIN StokOut ON Inventory.MedicineId = StokIn.MedicineId

Posted 3-Apr-11 7:31am

MarqW

Comments

sugababes4 4-Apr-11 1:32am

thanks MarqW, i'be try the code that u've given. But, the calculation is not very well functioning. For your information, I'M using update function in the gridview. here is my code :

Protected Sub btnUpdate_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Dim KodUbat As String = CType(Session("KodUbat"), String)

Dim EstrConn As String
EstrConn = "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\inventory.mdf;Integrated Security=True;User Instance=True "
Dim EMySQL As String = "UPDATE Inventory SET CurrentQTY = Inventory.CurrentQTY + ISNULL(StockIn.QtyIn, 0) - ISNULL(StockOut.QtyOut, 0) FROM Inventori LEFT OUTER JOIN StockIn ON Inventory.MedicineId = StockIn.MedicineId LEFT OUTER JOIN StockOut ON Inventory.MedicineId = StokMasuk.MedicineId"
Dim EMyConn As New SqlClient.SqlConnection(EstrConn)
Dim ECmd As New SqlClient.SqlCommand(EMySQL, EMyConn)
EMyConn.Open()
ECmd.ExecuteNonQuery()
EMyConn.Close()
End Sub

The value of the current quantity should be changed based on the changing of the input value stock in or out.