值java.sql.SQLException

Question

我收到以下错误：

java.sql.SQLException: Exhausted Resultset
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
    at oracle.jdbc.driver.ScrollableResultSet.getOracleObject(ScrollableResultSet.java:655)
    at oracle.jdbc.driver.ScrollableResultSet.getFloat(ScrollableResultSet.java:828)
    at oracle.jdbc.driver.OracleResultSet.getFloat(OracleResultSet.java:1552)
    at website.web.InboxReader.NormalizeImp(InboxReader.java:625)
    at website.web.InboxReader.accessGmail(InboxReader.java:122)
    at website.web.InboxReader.main(InboxReader.java:51)

在以下几行之后：

    ResultSet parentMessage = parentstmt.executeQuery("SELECT SUM(IMPORTANCE) AS IMPAVG FROM MAIL");
    avgsum = parentMessage.getFloat("IMPAVG");

我没有正确地做到这一点吗？

谢谢！

Answer 1

尝试致电

parentMessage.next();

尝试访问SQL之前