java - 检查 MySQL 结果是否返回行

Question

我有以下 Java 代码

// SELECT
String stringQuery  = "SELECT klucz, itemDATA, itemQTY, itemDUR FROM sellbox WHERE gracz =? "
                    + "ORDER BY czas DESC LIMIT 1";

PreparedStatement statement = this.connection.prepareStatement( stringQuery );
statement.setString( 1, playerName ); 

ResultSet queryResult = statement.executeQuery();
queryResult.first();

如何判断是否返回行？

Answer 1

你可以这样做:

ResultSet queryResult = statement.executeQuery();
if (queryResult.next()) {
   // process the data
}