Data Retrieve from Database using for loop
Question
Am using the following code for retrieve the data from MYSQL Data Base.I create separate method(GCotnStr) for DB connection and I call that method in this code.The DB connection and Retrieve the data is working properly.My problem is I use "String StudName = TmpFlxTRs.getString("StudName");" like class,mark1,mark2 ,result for getting and set the values in Jtable.How to retrieve the data and display in JTable using particular row,How to retrieve the data using Student Name,If I pass the parameter as "Student name" means I get all student Name without using "String StudName = TmpFlxTRs.getString("StudName");" use FOR LOOP.
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
}
2 answers
solution1
1 2011-12-28 06:20:29
编写自定义方法来修改您的查询以获取您想要的确切数据，例如，您希望获得所有学生的姓名，您的查询应该是String select = "Select StudName from studentmaster"而不是String select = "Select * from studentmaster"因此创建一个通用将获取将由查询提取的列的参数的方法
solution2
1 2011-12-28 07:34:11
Well,I'm not sure if this is what you mean?
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.
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
How to retrieve data from database using hashmap?
Retrieve a row data from database using JPQL
retrieve data from database into textboxes using jsf and to edit that data
Using Spring Reactor to retrieve data from relational database
Retrieve data from database and display it dynamically in the rows of the table using textboxes
How to retrieve the java data types of columns from the database using Hibernate?
How to retrieve data in java from memo field using progress database
Store/Retrieve Json data to/from Mysql 5.7 database using hibernate
retrieve data of collection type from database using getters and setters
How to retrieve data from database using jOOQ based on jsontype properties
Related Tags