SQLException:在开始结果集之前

Question

   ResultSet rs;
   rs = this.orderedProduct.select(" sum(unitstoproduce) "," soNo = "+ soNo);

   int sum = Integer.parseInt(rs.getString(1));

当我尝试在java类中执行上述查询时,我得到如下的异常.这里有orderedProduct(orderedZnAlProduct)是表

   SELECT  sum(unitstoproduce)  FROM orderedZnAlProduct WHERE  soNo = '15005'

   java.sql.SQLException: Before start of result set

Answer 1

我没有看到您的查询执行的位置(如statement.executeQuery())但是,当光标位置不正确时,通常会发生这种错误.您需要调用类似rs.next()或rs.first()移动光标然后获取结果的内容.