Question

我想从数据库中检索数据并显示到JLabels。我在Netbeans工作，我已经完成了这个..

private void showActionPerformed(java.awt.event.ActionEvent evt) {                                     
  int row=jTable1.getSelectedRow();
  int column=jTable1.getSelectedColumn();
    String str=(String)jTable1.getValueAt(row,column); 

    try{
    rs=stat.executeQuery("select * from table3 where e_id='"+str+"'");

    jLabel1.setText(rs.getString("name"));
    jLabel12.setText(rs.getString("e_id"));

    }
    catch(Exception e)
    {System.out.print(e);}


}

无法显示任何内容。我在记事本中试过这个并且工作正常，但不是在netbeans中任何帮助表示赞赏。

Answer 1

在获取列信息之前，您应该致电ResultSet#next()。

 rs=stat.executeQuery("select * from table3 where e_id='"+str+"'");
    while(rs.next()){
    jLabel1.setText(rs.getString("name"));
    jLabel12.setText(rs.getString("e_id"));
    }

我强烈建议您使用PreparedStatement而不是Simple Statement，这会使您的代码容易出现SQL注入

Answer 2

试试这个

while (rs1.next()) {
    k= new Object[8][8]; 
    k[i][0] = rs1.getString("st_id");
    k[i][1] = rs1.getString("name");
    k[i][2] = rs1.getString("adm_year");
    k[i][3] = rs1.getString("crrt_year");
    k[i][4] = rs1.getString("mcode");
    k[i][5] = rs1.getString("grade");
    k[i][6] = rs1.getString("credit");
    k[i][7] = rs1.getString("attempt");
    System.out.println(k[i][4]);
    i++;

    }
    jTable1.setModel(new DefaultTableModel(k, new String[]{"Student ID", "Name", "Admmission Year", "Current Year", "Modules", "Grade", "Credit", "Attempt"}))

从数据库检索到JLabel

2 个答案: