列中的多个值

Question

我的代码就像这样

ResultSet rs = statement.executeQuery(
    "SELECT SUM(column1) FROM table where column2=name "); 
system.out.println(rs)

这是对的吗？或者我如何从java中的SQL列中获取sum值？你能写一个小例子吗？

Answer 1

ResultSet rs = statement.executeQuery(
   "SELECT SUM(column1) FROM table where column2=name "); 
System.out.println(rs);// this is wrong 

这将打印ResultSet对象。

这应该是

ResultSet rs = statement.executeQuery(
   "SELECT SUM(column1) FROM table where column2=name "); 
if(rs.next()){
System.out.println(rs.getInt(1));
}