1. 首页
  2. 问答
  3. 使用for循环从数据库中检索数据

使用for循环从数据库中检索数据

2011-12-28 52 views
0

正在使用以下代码从MYSQL数据库中检索数据。我为数据库连接创建单独的方法（GCotnStr），并在此代码中调用该方法。数据库连接和检索数据工作正常。我的问题是我使用“字符串StudName = TmpFlxTRs.getString（”StudName“）;”如class，mark1，mark2，用于获取和设置Jtable中的值的结果。如何使用特定的行检索数据并显示在JTable中，如何使用学生名称检索数据，如果将参数传递为“学生姓名”我没有使用“String StudName = TmpFlxTRs.getString（”StudName“）;”使用FOR LOOP。使用for循环从数据库中检索数据

package designstudent; 
import javax.swing.table.DefaultTableModel; 
import java.sql.*; 

public class FrmeA extends javax.swing.JFrame { 

    Statement TmpFlxTSt=null; 
     ResultSet TmpFlxTRs=null; 
     GContnStr GCS=new GContnStr(); 

    public FrmeA() { 
     initComponents(); 
    } 

public void initcon() 
    { 
try{ 
    DefaultTableModel model=(DefaultTableModel)jTable1.getModel(); 
      GCS.GContnStr(); 
      TmpFlxTSt= GCS.GCotnStr.createStatement(); 
      String select = "Select * from studentmaster"; 
      TmpFlxTRs = TmpFlxTSt.executeQuery(select); 

       int i = 0; 
       while (TmpFlxTRs.next()){ 

        String Name = TmpFlxTRs.getString("StudName"); 
        String Class = TmpFlxTRs.getString("StudClass"); 
        String Subj1 = TmpFlxTRs.getString("StudMrk1"); 
        String Subj2= TmpFlxTRs.getString("StudMrk2"); 
        String StudTot = TmpFlxTRs.getString("StudTot"); 
        String StudRes= TmpFlxTRs.getString("StudRes"); 
        String StudNo=TmpFlxTRs.getString("StudNo"); 
        String StudId=TmpFlxTRs.getString("StudId"); 
        model.addRow(new Object[]{Name,Class,Subj1,Subj2,StudTot,StudRes,StudId,StudNo}); 
} 
     } 
     catch (Exception e) { 
       System.out.println(e); 
      } 
       } 

    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code">       
    private void initComponents() { 

     jPanel1 = new javax.swing.JPanel(); 
     jPanel2 = new javax.swing.JPanel(); 
     CmdA = new javax.swing.JButton(); 
     CmdE = new javax.swing.JButton(); 
     CmdD = new javax.swing.JButton(); 
     cmdQ = new javax.swing.JButton(); 
     jPanel3 = new javax.swing.JPanel(); 
     jScrollPane1 = new javax.swing.JScrollPane(); 
     jTable1 = new javax.swing.JTable(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

     jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createMatteBorder(1, 1, 1, 1, new java.awt.Color(0, 0, 255)), "Commands")); 

     CmdA.setText("+"); 

     CmdE.setText("E"); 

     CmdD.setText("-"); 

     cmdQ.setText("Q"); 

     javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); 
     jPanel2.setLayout(jPanel2Layout); 
     jPanel2Layout.setHorizontalGroup(
      jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(jPanel2Layout.createSequentialGroup() 
       .addContainerGap() 
       .addComponent(CmdA, javax.swing.GroupLayout.PREFERRED_SIZE, 64, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
       .addComponent(CmdE, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
       .addComponent(CmdD, javax.swing.GroupLayout.DEFAULT_SIZE, 72, Short.MAX_VALUE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
       .addComponent(cmdQ, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap()) 
     ); 
     jPanel2Layout.setVerticalGroup(
      jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(jPanel2Layout.createSequentialGroup() 
       .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false) 
        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel2Layout.createSequentialGroup() 
         .addGap(20, 20, 20) 
         .addComponent(CmdA, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel2Layout.createSequentialGroup() 
         .addGap(22, 22, 22) 
         .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
          .addComponent(CmdD, javax.swing.GroupLayout.DEFAULT_SIZE, 57, Short.MAX_VALUE) 
          .addComponent(CmdE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
          .addComponent(cmdQ, javax.swing.GroupLayout.DEFAULT_SIZE, 57, Short.MAX_VALUE)))) 
       .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
     ); 

     jPanel3.setBorder(javax.swing.BorderFactory.createMatteBorder(1, 1, 1, 1, new java.awt.Color(0, 0, 255))); 

     jTable1.setModel(new javax.swing.table.DefaultTableModel(
      new Object [][] { 

      }, 
      new String [] { 
       "StudName", "StudClass", "StudMrk1", "StudMrk2", "StudTot", "StudRes", "StudNO", "StudId" 
      } 
     ) { 
      Class[] types = new Class [] { 
       java.lang.String.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class 
      }; 

      public Class getColumnClass(int columnIndex) { 
       return types [columnIndex]; 
      } 
     }); 
     jScrollPane1.setViewportView(jTable1); 
     jTable1.getColumnModel().getColumn(0).setResizable(false); 
     jTable1.getColumnModel().getColumn(0).setPreferredWidth(150); 
     jTable1.getColumnModel().getColumn(1).setResizable(false); 
     jTable1.getColumnModel().getColumn(1).setPreferredWidth(70); 
     jTable1.getColumnModel().getColumn(2).setResizable(false); 
     jTable1.getColumnModel().getColumn(2).setPreferredWidth(70); 
     jTable1.getColumnModel().getColumn(3).setResizable(false); 
     jTable1.getColumnModel().getColumn(3).setPreferredWidth(70); 
     jTable1.getColumnModel().getColumn(4).setResizable(false); 
     jTable1.getColumnModel().getColumn(4).setPreferredWidth(70); 
     jTable1.getColumnModel().getColumn(5).setResizable(false); 
     jTable1.getColumnModel().getColumn(5).setPreferredWidth(70); 
     jTable1.getColumnModel().getColumn(6).setMinWidth(0); 
     jTable1.getColumnModel().getColumn(6).setPreferredWidth(0); 
     jTable1.getColumnModel().getColumn(6).setMaxWidth(0); 
     jTable1.getColumnModel().getColumn(7).setMinWidth(0); 
     jTable1.getColumnModel().getColumn(7).setPreferredWidth(0); 
     jTable1.getColumnModel().getColumn(7).setMaxWidth(0); 

     javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3); 
     jPanel3.setLayout(jPanel3Layout); 
     jPanel3Layout.setHorizontalGroup(
      jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 984, Short.MAX_VALUE) 
      .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel3Layout.createSequentialGroup() 
        .addContainerGap() 
        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 964, Short.MAX_VALUE) 
        .addContainerGap())) 
     ); 
     jPanel3Layout.setVerticalGroup(
      jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 249, Short.MAX_VALUE) 
      .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel3Layout.createSequentialGroup() 
        .addContainerGap() 
        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 184, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addContainerGap(54, Short.MAX_VALUE))) 
     ); 

     javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
     jPanel1.setLayout(jPanel1Layout); 
     jPanel1Layout.setHorizontalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() 
       .addContainerGap(657, Short.MAX_VALUE) 
       .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap()) 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addContainerGap() 
        .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
        .addContainerGap())) 
     ); 
     jPanel1Layout.setVerticalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(jPanel1Layout.createSequentialGroup() 
       .addGap(19, 19, 19) 
       .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addContainerGap(803, Short.MAX_VALUE)) 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addGap(190, 190, 190) 
        .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addContainerGap(492, Short.MAX_VALUE))) 
     ); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 1016, Short.MAX_VALUE) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGap(0, 946, Short.MAX_VALUE) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addContainerGap(13, Short.MAX_VALUE))) 
     ); 

     pack(); 
     java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize(); 
     java.awt.Dimension dialogSize = getSize(); 
     setLocation((screenSize.width-dialogSize.width)/2,(screenSize.height-dialogSize.height)/2); 
    }// </editor-fold>       

    public static void main(String args[]) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
        FrmeA f= new FrmeA(); 
       f.initcon(); 
       f.setVisible(true); 

      } 
     }); 
    } 

    // Variables declaration - do not modify      
    private javax.swing.JButton CmdA; 
    private javax.swing.JButton CmdD; 
    private javax.swing.JButton CmdE; 
    private javax.swing.JButton cmdQ; 
    private javax.swing.JPanel jPanel1; 
    private javax.swing.JPanel jPanel2; 
    private javax.swing.JPanel jPanel3; 
    private javax.swing.JScrollPane jScrollPane1; 
    private javax.swing.JTable jTable1; 
    // End of variables declaration     

}

来源

2011-12-28 unknown

+0

的可能重复的[无法显示使用MySQL数据JTable中任何输出（http://stackoverflow.com/questions/8645123/unable-to-show-any-output-in-a-jtable - 使用MySQL的数据） – trashgod 2011-12-28 09:08:50

回答

1

写您的自定义的方法来修改你的查询来获取你想你想获得所有学生的姓名您的查询应该是String select = "Select StudName from studentmaster"代替String select = "Select * from studentmaster"例如，所以创造出将采取列参数的泛型方法准确数据，将通过查询获取

来源

2011-12-28 06:20:29

1

嗯，我不确定这是不是你的意思？

String select = "Select StudName from studentmaster"; 
TmpFlxTRs = TmpFlxTSt.executeQuery(select); 

    while (TmpFlxTRs.next()){     
     // TmpFlxTRs.getString(1) will have the corresponding name, add it to the table. 
    }

来源

2011-12-28 07:34:11 COD3BOY

相关问题

 相关问题