Question

How can I use resultset to get me the minimum, average or maximum value from a mysql database column?

I have a prepared statement sql constant string = Select avg(EntryValues) from Entries;

I know I need to use a resultset.getString(EntryValues) but I dont know how to build the java method that would return the actual average value from that resultset.next() loop thing…

Could you please help me?

Answer 1

1. Get a statement from your connection

2. use the statement.executeQuery() method to invoke your query and assign it to your ResultSet, e.g.

   ResultSet rs = statement.executeQuery("SELECT AVG(EntryValues) FROM Entries");
   

3. Your result is one simple ‘row‘ therefore you can use

   if(rs.next()) {  // check if a result was returned
     String avg = rs.getString(1); // get your result
   }
   

If your result contains multiple rows you’ll have to use a while-loop for example to iterate through all the result entries:

while(rs.next()) {
  // do your thing
}

Hope this helpes, have Fun!