JDBC: 数据库基本操作演示程序

/** @author：毛毛

JDBC中操作数据库的一些基本操作演示程序。GUI设计界面是随意的。

这里数据库是Access表，数据库名：Data, 表名：Student。

package AccessSQL;

import java.awt.*;
import java.sql.*;
import java.awt.event.*;

import javax.swing.*;

/*
* 数据库操作，插入，删除，查询等
*/
public class ModifyDisplay extends JFrame
implements ActionListener{

//定义各个组件

JLabel lbRow = new JLabel("行数");
JTextField tfRow = new JTextField();

JLabel lbID = new JLabel("学号");
JLabel lbName = new JLabel("姓名");
JLabel lbAge = new JLabel("年龄");
JLabel lbPro = new JLabel("专业");

JTextField tfID = new JTextField();
JTextField tfName = new JTextField();
JTextField tfAge = new JTextField();
JTextField tfPro = new JTextField();

JButton btnFind = new JButton("查 询");
JButton btnDel = new JButton("删 除");
JButton btnAll = new JButton("全 部");
JButton btnInsert = new JButton("插 入");

JLabel lPro = new JLabel("专业");
JTextField tPro = new JTextField();
JButton btnFind2 = new JButton("按专业查询");

JPanel panel = new JPanel();
JTextArea taInfo = new JTextArea();
private Container contrainer = getContentPane();

public ModifyDisplay()
{
super("学生信息查询");
setSize(400, 300);
this.setBounds(100, 100, 500, 600);
}

//设置容器面板的布局
public void setLayout()
{

panel.setLayout(null);

//在面板panel中相对panel, 其中lbRow:left=0 top=10 width=30 height=25
lbRow.setBounds(0, 10, 30, 25);
tfRow.setBounds(40, 10, 70, 25);
btnFind.setBounds(130, 10, 70, 25);
btnDel.setBounds(210, 10, 70, 25);
btnAll.setBounds(290, 10, 70, 25);

lbID.setBounds(10, 50, 60, 25);
lbName.setBounds(75, 50, 60, 25);
lbAge.setBounds(140, 50, 60, 25);
lbPro.setBounds(210, 50, 60, 25);

tfID.setBounds(0, 80, 60, 25);
tfName.setBounds(65, 80, 60, 25);
tfAge.setBounds(130, 80, 60, 25);
tfPro.setBounds(200, 80, 60, 25);
btnInsert.setBounds(275, 80, 70, 25);

lPro.setBounds(0, 120, 30, 25);
tPro.setBounds(40, 120, 90, 25);
btnFind2.setBounds(160, 120, 100, 25);

panel.add(lbRow);
panel.add(tfRow);
panel.add(btnFind);
panel.add(btnDel);
panel.add(btnAll);

panel.add(lbID);
panel.add(lbName);
panel.add(lbAge);
panel.add(lbPro);

panel.add(tfID);
panel.add(tfName);
panel.add(tfAge);
panel.add(tfPro);
panel.add(btnInsert);

panel.add(lPro);
panel.add(tPro);
panel.add(btnFind2);

//注册监听器
btnFind.addActionListener(this);
btnDel.addActionListener(this);
btnAll.addActionListener(this);
btnInsert.addActionListener(this);
btnFind2.addActionListener(this);

getContentPane().setLayout(null);

//panel: left=20 top=10 width=370 height=110
panel.setBounds(20, 10, 370, 150);
taInfo.setBounds(20, 160, 370, 380);

getContentPane().add(panel);
getContentPane().add(taInfo);

}

public void GetRecord(int Row, int type, String ID, String Name,
String Age, String Pro) throws SQLException{

String URL,SQL;
Connection con = null;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException ex)
{
taInfo.setText(ex.getMessage());
System.out.println(-1);
}

try{

//连接数据库, 向数据库发送执行请求
URL = "jdbc:odbc:Data";
con = DriverManager.getConnection(URL);
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
SQL = "SELECT ID,姓名,age,专业 FROM Student";
ResultSet rs = stmt.executeQuery(SQL);

taInfo.setText("");
taInfo.append("学号/t姓名/t年龄/t专业/n/n");
if(type == 0) //全部查询
{
rs.beforeFirst();
while(rs.next())
{
taInfo.append(rs.getInt("ID") + "/t");
taInfo.append(rs.getString("姓名") + "/t");
taInfo.append(rs.getInt("age") + "/t");
taInfo.append(rs.getString("专业") + "/n");
}
}
else if(type == 1) //按行查询
{
rs.absolute(Row);
taInfo.append(rs.getInt("ID") + "/t");
taInfo.append(rs.getString("姓名") + "/t");
taInfo.append(rs.getInt("age") + "/t");
taInfo.append(rs.getString("专业") + "/n");
}
else if(type == 2) //删除

{
rs.absolute(Row);
rs.deleteRow();
rs.updateRow();

rs.beforeFirst();
while(rs.next())
{
taInfo.append(rs.getInt("ID") + "/t");
taInfo.append(rs.getString("姓名") + "/t");
taInfo.append(rs.getInt("age") + "/t");
taInfo.append(rs.getString("专业") + "/n");
}
}
else if(type == 3) //插入
{
rs.last();
rs.moveToInsertRow();
int id = Integer.parseInt(ID);
int age = Integer.parseInt(Age);

rs.updateInt("ID", id);
rs.updateString("姓名", Name);
rs.updateInt("age", age);
rs.updateString("专业", Pro);

rs.insertRow();
rs.updateRow();

rs.beforeFirst();
while(rs.next())
{
taInfo.append(rs.getInt("ID") + "/t");
taInfo.append(rs.getString("姓名") + "/t");
taInfo.append(rs.getInt("age") + "/t");
taInfo.append(rs.getString("专业") + "/n");
}
}
else if(type == 4) //按专业查询
{
String sql = "SELECT ID,姓名,age,专业 FROM Student"+" WHERE 专业=?";
PreparedStatement preSt = con.prepareStatement(sql);
preSt.setString(1,Pro);
ResultSet rs1 = preSt.executeQuery();

while(rs1.next())
{
taInfo.append(rs1.getInt("ID") + "/t");
taInfo.append(rs1.getString("姓名") + "/t");
taInfo.append(rs1.getInt("age") + "/t");
taInfo.append(rs1.getString("专业") + "/n");
}

rs1.close();
preSt.close();
}
contrainer.add(taInfo);

rs.close();
stmt.close();
}
catch(SQLException ex){
taInfo.setText(ex.getMessage());
}
finally{
con.close();
}
}

public static void main(String[] args) {

ModifyDisplay frame = new ModifyDisplay();
frame.setLayout();
frame.show();

}

@Override // 按钮事件处理
public void actionPerformed(ActionEvent e) {

/*
* type值含义
* 0:全部查询 , 1:按行查询 , 2:按行删除 , 3:按行插入, 4:按专业查询
*/
if(e.getSource() == btnAll)
{
int type = 0;
try{
GetRecord(0, type, null,null,null,null);

}catch(SQLException ex){

taInfo.setText(ex.getMessage());
taInfo.setForeground(Color.red);
}
}
else if(e.getSource() == btnFind)
{
int type;
String strRow = tfRow.getText();
char ch;
boolean flag = false;

//判断输入的数据是否全是数字
for(int i=0; i<strRow.length(); i++)
{
ch = strRow.charAt(i);
if(Character.isDigit(ch))
flag = true;
else
{
flag = false;
break;
}
}

if(flag)
{
type = 1;
int intRow = Integer.parseInt(strRow);

try{
GetRecord(intRow,type,null, null,null,null);
}
catch(SQLException ex){
taInfo.setText(ex.getMessage());
}
}
else
{
taInfo.setText("Please only input number!");
taInfo.setForeground(Color.red);
}

}
else if(e.getSource() == btnDel)
{
int type;
String strRow = tfRow.getText();
char ch;
boolean flag = false;

//判断输入的数据是否全是数字
for(int i=0; i<strRow.length(); i++)
{
ch = strRow.charAt(i);
if(Character.isDigit(ch))
flag = true;
else
{
flag = false;
break;
}
}

if(flag)
{
type = 2;
int intRow = Integer.parseInt(strRow);

try{
GetRecord(intRow,type,null,null,null,null);
}
catch(SQLException ex){

taInfo.setText(ex.getMessage());
taInfo.setForeground(Color.red);
}
}
else
{
taInfo.setText("Please only input number!");
taInfo.setForeground(Color.red);
}

}
else if(e.getSource() == btnInsert)
{
String strID = tfID.getText();
String strName = tfName.getText();
String strAge = tfAge.getText();
String strPro = tfPro.getText();

int type = 3;
char ch1,ch2;
boolean flag1=false, flag2=false;

for(int i=0; i<strID.length(); i++)
{
ch1 = strID.charAt(i);
if(Character.isDigit(ch1))
flag1 = true;
else
{
flag1 = false;
break;
}
}
for(int i=0; i<strAge.length(); i++)
{
ch2 = strAge.charAt(i);
if(Character.isDigit(ch2))
flag2 = true;
else
{
flag2 = false;
break;
}
}
if(flag1&&flag2)
{
try{
GetRecord(0,type,strID,strName,strAge,strPro);
}
catch(SQLException ex){
taInfo.setText(ex.getMessage());
taInfo.setForeground(Color.red);
}
}
else
{
taInfo.setText("Please input right(correct) student's information!");
taInfo.setForeground(Color.red);
}

}
else if(e.getSource() == btnFind2)
{
int type = 4;
String strPro = tPro.getText();

try{
GetRecord(0, type, null,null,null,strPro);

}catch(SQLException ex){
taInfo.setText(ex.getMessage());
taInfo.setForeground(Color.red);
}
}
}
}