Question

I am new in vb.NET and SQL. I want to view the latest input in my vb.NET program. How would I do it? Where bed number is auto-increment. Currently, this do record the changes in the database but when I want to view the details the label remains empty which it should be.

This is my code:

 Dim SQLStatement As String = "SELECT name, age, date_of_confinement,type_of_sickness, " _
                              "type_of_IV_fluid, number_of_bottles, drop_rate " _
                              "FROM patient WHERE bednumber=1"

    Dim cmd As MySqlCommand = New MySqlCommand

    With cmd
        .CommandText = SQLStatement
        .CommandType = CommandType.Text
        .Connection = SQLConnection
        .ExecuteNonQuery()

        '--read the records in database in phpmyadmin gui---
        Dim myReader As MySqlDataReader = cmd.ExecuteReader
        If myReader.Read Then
            ViewInfo.lblName.Text = myReader.GetString(0)
            ViewInfo.lblAge.Text = myReader.GetString(1)
            ViewInfo.lblDate.Text = myReader.GetString(2)
            ViewInfo.lblSickness.Text = myReader.GetString(3)
            ViewInfo.lblFluid.Text = myReader.GetString(4)
            ViewInfo.lblBottle.Text = myReader.GetString(5)
            ViewInfo.lblDrop.Text = myReader.GetString(6)

            myReader.Close()
        End If
    End With

Thanks!

Answer 1

Try to change the SQL statement in this way:

 Dim SQLStatement As String = "SELECT TOP 1 name, age, date_of_confinement,type_of_sickness, " _ 
                              "type_of_IV_fluid, number_of_bottles, drop_rate " _ 
                              "FROM patient ORDER BY bedumber DESC" 

This will sort the patient table on bednumber in descending order (so the last inserted record is on top) then get this first record (TOP 1).

Of course I suppose that bednumber is a numeric column with values autogenerated sequentially by the database in rough order of insertion.