Question

我正在尝试实现一个jdbc连接，当我“搜索”与'％input％'匹配输入的内容时，它会返回表中的所有数据。

例如ResultSet rs4 = stm4.executeQuery("select imageTime from image_data where imageName like '%" + value3 + "%' or imageTime like '%" + value3 + "%' or imageLocation like '" + value3 + "'" );

我正在尝试将结果集中的所有行作为搜索结果返回。但如果我没有更多的行去指令Resultset.next 导致以下结果集全部为null，....

如果有任何id喜欢输出整个结果集的方法，谢谢。

EDIT 编辑问题：更直接;我需要一种方法来从结果集的每个包含列中的每一行获取每一段数据。所以我可以输出它。这是我在下面的尝试。

rs4 =如下所述的结果集。

这是我的代码;

if(name_time_location == 1)
        {                
            String value3=searchInput.getText();//Sets the search Input as value3


            // selecting the cominbation from table, that match input options                               
            try{
                con = DriverManager.getConnection("jdbc:mysql:blah blah");

                // Query the database for the correct username and passord                    
                Statement stm3 = con.createStatement();  
                Statement stm4 = con.createStatement();
                Statement stm5 = con.createStatement();


                //queries database for password from input username 
                ResultSet rs3 = stm3.executeQuery("select imageName from image_data    where imageName like '%" + value3 + "%' or imageTime like '%" + value3 + "%' or imageLocation like '" + value3 + "'" );
                //ResultSetMetaData rsmd = rs3.getMetaData();
                //stm3.setFetchSize(5);
                //rs3.last();
                //int numberOfRows = rs3.getRow();


                //String[] resultList; 
                //resultList = new String[numberOfRows];
                // Fetch each row from the result set
                rs3.beforeFirst();
                while(rs3.next())
                {
                    imageSearchResult1 = rs3.getString(1); 
                    rs3.next();
                    imageSearchResult11 = rs4.getString(1);
                    rs3.next();
                    imageSearchResult12 = rs4.getString(1);
                    rs3.next();
                    imageSearchResult13 = rs4.getString(1);
                    rs3.next();
                    imageSearchResult14 = rs4.getString(1); 
                }rs3.close();

            }catch (Exception e)
            {
                    //System.out.println("Exception: " + e + "");
            }

            System.out.println("Search Results: \nName: " + imageSearchResult1 + "         Time stamp: " + imageSearchResult2 + "   Location: " + imageSearchResult3 + "\n" +
                    "Name: " + imageSearchResult11 + "   Time stamp: " + imageSearchResult21 + "   Location: " + imageSearchResult31 + "\n" + 
                    "Name: " + imageSearchResult12 + "   Time stamp: " + imageSearchResult22 + "   Location: " + imageSearchResult32 + "\n" +
                    "Name: " + imageSearchResult13 + "   Time stamp: " + imageSearchResult23 + "   Location: " + imageSearchResult33 + "\n" +
                    "Name: " + imageSearchResult14 + "   Time stamp: " + imageSearchResult24 + "   Location: " + imageSearchResult34 + "\n" );

Answer 1

我认为你可以通过修改查询来实现同样的目的，而不是创建3个查询，在同一个查询中获取3个值：

select imageName,imageLocation,imageTime from .....

然后使用此查询生成ResultSet并将三个值作为rs.getType(1),rs.getType(2),rs.getType(3)。

在同一个while(rs.next())循环中，您可以打印要打印的数据。

java jdbc连接 - 结果集输出问题

1 个答案: