如何将标签文本更改为MySql数据库中的最后一个值？

Question

So i got a database senzor with user senzor and pass password the database looks like this database screen

i want to display last value from "temp" in a text label in c# program when i click a "REFRESH" button. i`m using visual studio 2013 C# for the program.

PS the text label will automaticly change value when i click the REFRESH button and will remain unchanged untill i press the REFRESH button again.

thanks in advance ,

Johnny M

Answer 1

Order descending, then use the limit to return the last row -- now in the first position!

    String query =  @"SELECT temp
        FROM TableName
        ORDER BY Id DESC
        LIMIT 1";

     string connString = "Server=localhost; Database=myDatabaseName; 
 Trusted_Connection=Yes";

   SQLiteConnection connection = new SQLiteConnection(connString);
SQLiteDataAdapter da = new SQLiteDataAdapter(query, connection);


DataSet ds = new DataSet();

Do your table mappings if any. And then call da.Fill(ds, "issuedBooks");

    Label.Text = ds;

you can use this code inside button "REFRESH"