计数mysql语句未在Java中返回正确的值

Question

I am getting a value of 9 from a count statement, but when I tried it in the localhost I am getting 18. Help me pls I'm stuck here thank you so much

Here is my code

private int getgoods;
String query="Select count(item_id) as 'total' from item_tb";
PreparedStatement pst =conn.prepareStatement(query);
ResultSet rs = pst.executeQuery();

while(rs.next())
{
         getgoods=rs.getInt("total");
}

JOptionPane.showMessageDialog(null, getgoods); 
// supposedly to be 18 but im getting 9

Answer 1

Use * instead of item_id in the query like this,

String query="Select count(*) as 'total' from item_tb";

and use if(rs.next()) instead of while loop.

Answer 2

Try following:

ResultSet rs = st.executeQuery("Select count(*) as 'total' from item_tb");
rs.next();
int count = rs.getInt(1);

or

ResultSet rs = st.executeQuery("Select count(1) as 'total' from item_tb");
rs.next();
int count = rs.getInt(1);