如何检查MySQL表是否具有Java / Android中的下一行

Question

I was thinking what is a nice way to check if database has a next row? I have an android app, which is consuming PHP web service and I have MySQL database ('dummy').

public class myAwesomeClass extends Activity{
    public void onButtonClicked(View view){
       if (dummy has row){
           //do something
           //and proceed to next row
        }
          else {
          //something else
            }
        }
    }

Hos does it work? Is there a "special" query in MySQL, or method in PHP? Or is it possible to do it directly within the app? Examples, suggestions, links - everything is appreciated. Thanks

Answer 1

您无需检查数据库是否有下一行，而是从数据库中获取的结果集是否包含另一个对象。在Java中（自您提到Android以来），当您从ResultSet对象中从数据库中获取结果时，可以循环遍历结果并通过ResultSet.hasNext（）检查它是否有下一行