最初学习Java入门时候的东西:入门的哥们可以看看,就是与数据库链接，查询，删除等操纵数据库。
/**
* @(#)studentsearch.java
*
*
* @author
* @version 1.00 2007
*/
/*
* studentssearch.java
*
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
/**
*
* @author Administrator
*/
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.lang.Object.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class studentssearch extends JFrame{
JPanel contentPane;
Label label1 = new Label();
TextField snoField = new TextField();
Label label2 = new Label();
TextField snameField = new TextField();
Label label3 = new Label();
TextField smarkField = new TextField();
Label label4 = new Label();
TextField cnameField = new TextField();
Label label5 = new Label();
TextField sdeptField = new TextField();
Button searchButton = new Button();
Button deleteButton = new Button();
Button refreshButton = new Button();
Button addButton = new Button();
Vector vector;
String title []={"姓名","学号","课程","系别"," 成绩","老师"};
Connection connection = null;
ResultSet rSet =null;
Statement statement =null;
AbstractTableModel tm;
public void StuAoddQuerySysFrame() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
label1.setText("学号");
contentPane.setLayout(xYLayout1);
this.setSize(new Dimension(571, 521));
this.setTitle("学生成绩管理查询系统");
label2.setText("姓名");
label3.setText("成绩");
label4.setText("课程");
label5.setText("系名");
addButton.setLabel("添加");
deleteButton.setLabel("删除");
refreshButton.setLabel("更新");
addButton.setLabel("查询");
searchButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
searchButton_actionPerformed(e);
}
});
deleteButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
deleteButton_actionPerformed(e);
}
});
refreshButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
refreshButton_actionPerformed(e);
}
});
addButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
addButton_actionPerformed(e);
}
});
contentPane.add(snoField);
contentPane.add(label1);
contentPane.add(snameField);
contentPane.add(Label2);
contentPane.add(smarkField);
contentPane.add(Label3);
contentPane.add(cnameField);
contentPane.add(Label4);
contentPane.add(searchButton);
contentPane.add(deleteButton);
contentPane.add(refreshButton);
contentPane.add(addButton);
createtable();
}
void createtable(){
JTable table;
JScrollPane scroll;
vector =new Vector();
tm = new AbstractTableModel() {
public int getColumnCount() {
return title.length;
}
public int getRowCount() {
return vector.size();
}
public Object getValueAt(int row, int column) {
if(!vector.isEmpty()) {
return ((Vector)vector.elementAt(row)).elementAt(column);
}
else {
return null;
}
}
public void setValueAt(Object value, int row, int column) {
}
public String getColumnName(int column) {
return title[column];
}
public Class getColumnClass(int c) {
return getValueAt(0,c).getClass();
}
public boolean isCellEditable(int row, int column) {
return false;
}
};
table = new JTable(tm);
table.setToolTipText("Display add Result");
table.setAutoResizeMode(table.AUTO_RESIZE_OFF);
table.setCellSelectionEnabled(false);
table.setShowHorizontalLines(true);
table.setShowVerticalLines(true);
scroll = new JScrollPane(table);
scroll.setBounds(6,20,540,250);
contentPane.add(scroll);
}
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
}
}
void addButton_actionPerformed(ActionEvent e) {
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/studentmark";
connection = DriverManager.getConnection(url,root,"1230");
statement = connection.createStatement();
String sql1 = "insert into student(sno,sname,ssex,sdept) values (" + Integer.parseInt(snoField.getText()) +", '" + snameField.getText()+"'," ",'" "',"+"'"+sdepartField.getText()+ "')";
String sql2 = "insert into courese (smark,cname,tname) values (" + "'" + smarkField.getText()+"','" + cnamelField.getText()+"'," ")";
statement.executeUpdate(sql2);
statement.executeUpdate(sql1);
snoField.setText("");
snameField.setText("");
sdepartField.setText("");
}
catch(SQLException ex){
System.out.println("\nERROR:----- SQLException -----\n");
while (ex != null) {
System.out.println("Message: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
}
}
catch(Exception ex ) {
ex.printStackTrace();
}
finally {
try {
if(statement != null) {
statement.close();
}
if(connection != null) {
connection.close();
}
}
catch (SQLException ex) {
System.out.println("\nERROR:----- SQLException -----\n");
System.out.println("Message: " + ex.getMessage( ));
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
}
}
}
void delete_actionPerformed(ActionEvent e){
try{
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/studentmark";
connection = DriverManager.getConnection(url,root,"1230");
statement = connection.createStatement(
ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql="select * from student where sno="Integer.parseInt(snoField.gettext());
rSet = statement.executeQuery(sql);
if (rSet.next()==false) {
JOptionPane msg = new JOptionPane();
JOptionPane.showMessageDialog(StuAddQuerySysFrame.this, "数据库中没有您删除的学号", "数据库中没有您删除的学号！", 1);
}
else {
String sql1="delete from student where sno="+Integer.parseInt(snoField.getText());
statement.executeUpdate(sql1);
String sql2="delete from course where cname="+Integer.parseInt(cnameField.getText());
statement.executeUpdate(sql2);
snoField.setText("");
snameField.setText("");
sdeptField.setText("");
}
}
catch(SQLException ex){
System.out.println("\nERROR:----- SQLException -----\n");
while (ex != null) {
System.out.println("Message: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
}
}
catch(Exception ex ) {
ex.printStackTrace();
}
finally {
try {
if(statement != null) {
statement.close();
}
if(connection != null) {
connection.close();
}
}
catch (SQLException ex) {
System.out.println("\nERROR:----- SQLException -----\n");
System.out.println("Message: " + ex.getMessage( ));
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
}
}
}
void refreshButton_actionPerformed(ActionEvent e) {
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/studentmark";
connection = DriverManager.getConnection(url,root,"1230");
statement = connection.createStatement();
String sql1="update student set sname='"+snameField.getText()+"', ssex='"+sexField.getText()+"',sdept='"+sdeptField.getText()+"' where sno="+Integer.parseInt(snoField.getText());
statement.executeUpdate(sql1);
String sql2="update course set cname='"+cnameField.getText()+"' where cname="+Integer.parseInt(cnoField.getText());
statement.executeUpdate(sql2);
String sql3="update smark set smark='"+Integer.parseInt(smarkField.getText())+"' where sno="+Integer.parseInt(snoField.getText());
statement.executeUpdate(sql3);
snoField.setText("");
snameField.setText("");
sdeptField.setText("");
smarkField.setText("");
cnameField.setText("");
}
catch(SQLException ex){
System.out.println("\nERROR:----- SQLException -----\n");
while (ex != null) {
System.out.println("Message: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
}
}
catch(Exception ex ) {
ex.printStackTrace();
}
finally {
try {
if(statement != null) {
statement.close();
}
if(connection != null) {
connection.close();
}
}
catch (SQLException ex) {
System.out.println("\nERROR:----- SQLException -----\n");
System.out.println("Message: " + ex.getMessage( ));
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
}
}
}
void queryButton_actionPerformed(ActionEvent e) {
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/studentmark";
connection = DriverManager.getConnection(url,root,"1230");
statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql = "select * from student where sname="+snameField.getText() ;
rSet = statement.executeQuery(sql);
if (rSet.next()==false) {
JOptionPane msg = new JOptionPane();
JOptionPane.showMessageDialog(StuAddQuerySysFrame.this, "数据库中没有您查询的studnet", "数据库中没有您查询的学生", 1);
}
else {
sql = "select student.sno,sname ,sdept,smark,cname from student,course，smark,teacher where sname="+snameField.getText()
+"and"+smark= '"+Integer.parseInt(smarkField.getText())"' ;
ResultSet rs = statement.executeQuery(sql);
stunumField.setText("") ;
vector.removeAllElements();
tm.fireTableStructureChanged();
while(rs.next())
{
Vector rec_vector = new Vector();
rec_vector.addElement(String.valueOf(rs.getInt(1)));
rec_vector.addElement(rs.getString(2));
rec_vector.addElement(String.valueOf(rs.getInt(4)));
rec_vector.addElement(rs.getString(3));
rec_vector.addElement(rs.getString(5));
vector.addElement(rec_vector);
}
tm.fireTableStructureChanged();
}
}
catch(SQLException ex){
System.out.println("\nERROR:----- SQLException -----\n");
while (ex != null) {
System.out.println("Message: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
}
}
catch(Exception ex ) {
ex.printStackTrace();
}
finally {
try {
if(statement != null) {
statement.close();
}
if(connection != null) {
connection.close();
}
}
catch (SQLException ex) {
System.out.println("\nERROR:----- SQLException -----\n");
System.out.println("Message: " + ex.getMessage( ));
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("ErrorCode: " + ex.getErrorCode());
}
}
}
}