Java ResultSet如何检查是否有任何结果
结果集没有方法for hasNext。我想检查resultSet是否有任何值
Resultset has no method for hasNext. I want to check if the resultSet has any value
这是正确的方法
if (!resultSet.next() ) {
System.out.println("no data");
}
这是正确的，最初是 ResultSet 的光标指向第一行之前，如果第一次调用 next（）返回 false 然后 ResultSet 中没有数据。
That's correct, initially the ResultSet's cursor is pointing to before the first row, if the first call to next() returns false then there was no data in the ResultSet.
如果你使用这个方法，您可能必须在重置之后立即调用 beforeFirst（），因为它现在已将自己定位在第一行之后。
If you use this method, you may have to call beforeFirst() immediately after to reset it, since it has positioned itself past the first row now.
但是应该注意，下面的 Seifer的回答是这个问题的更优雅的解决方案。
It should be noted however, that Seifer's answer below is a more elegant solution to this question.