我今天自己编了一个跟数据库有关的用户界面程序,可是总是出现错误,大家帮我挑挑毛病?急!!!给个建议。
数据库文件:
BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
CREATE TABLE dbo.Table3
(
User_Name varchar(20) NOT NULL,
Password varchar(20) NOT NULL
) ON [PRIMARY]
GO
COMMIT源代码:1:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
import javax.swing.*;
public class Land
{
public static void main(String[] args)
{
LandFrame frame=new LandFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
class LandFrame extends JFrame
{
JLabel labelWelcome = new JLabel("小区车辆管理系统");
JLabel labelName=new JLabel("用户名:");
JLabel labelPassword=new JLabel("密码:");
JTextField textName=new JTextField();
JPasswordField textPassword=new JPasswordField();
JButton buttonEnter=new JButton("登录");
JButton buttoncancel=new JButton("清空");
public LandFrame()
{
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
int screenWidth=screenSize.width;
int screenHeight=screenSize.height;
setSize(screenWidth/4,screenHeight/4);
setLocation(screenWidth*3/8,screenHeight*3/8);
setTitle("登陆界面");
Font f = new Font("新宋体",Font.PLAIN,12);
Container con = getContentPane();
con.setLayout(null);
labelWelcome.setBounds(95,10,150,20);
labelWelcome.setFont(new Font("新宋体",Font.PLAIN,14));
con.add(labelWelcome);
labelName.setBounds(45,40,55,20);
labelName.setFont(f);
con.add(labelName);
textName.setBounds(95,40,120,20);
con.add(textName);
labelPassword.setBounds(45,70,45,20);
labelPassword.setFont(f);
con.add(labelPassword);
textPassword.setBounds(95,70,120,20);
con.add(textPassword);
buttonEnter.setBounds(90,110,60,20);
buttonEnter.setFont(f);
con.add(buttonEnter);
buttonEnter.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent m){
if(textName.getText().equals("")){
new JOptionPane().showMessageDialog(null,"用户名不能为空!");
}
else if(textPassword.getText().equals("")){
new JOptionPane().showMessageDialog(null,"密码不能为空!");
}
else{
String sql="select * from ClientInformation where User_Name = '" + textName.getText() + "' and Password = '" + textPassword.getText()+ "'";
System.out.println(sql);
Judge(sql);
}
}
});
buttoncancel.setBounds(155,110,60,20);
buttoncancel.setFont(f);
con.add(buttoncancel);
buttoncancel.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent m){
textName.setText("");
textPassword.setText("");
}
});
}
private void Judge(String sqlString) { if (Database.joinDB()) {
if (Database.query(sqlString))
try{
if(Database.rs.isBeforeFirst()) {
System.out.println("密码正确");
Database.cn.close();
}
else {
System.out.println("错误");
new JOptionPane().showMessageDialog(null,"用户名或密码错误!","",JOptionPane.ERROR_MESSAGE);
}
}catch(Exception e) {
System.out.println(e.getMessage());
}
}
else{
System.out.println("连接数据库不成功!!!");
}
}
}
2:import java.sql.*;public class Database {
public static Connection cn;
public static Statement st;
public static ResultSet rs; public static boolean joinDB() {
boolean joinFlag;
try {
joinFlag = true;
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
cn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=sample","sa","605");
System.out.println("数据库连接成功");
st = cn.createStatement();
st.execute("INSERT INTO Table3 VALUES ('admin,123')");
return joinFlag; }
catch (SQLException e) {
System.out.println(e.getMessage());
joinFlag = false;
return joinFlag;
}
catch (ClassNotFoundException e) {
System.out.println(e.getMessage());
joinFlag = false;
return joinFlag;
}
} public static boolean executeSQL(String sqlString) {
boolean executeFlag;
try {
st.execute(sqlString);
executeFlag = true;
} catch (Exception e) {
executeFlag = false;
System.out.println("sql exception:" + e.getMessage());
}
return executeFlag;
}
public static boolean query(String sqlString) { try {
rs = null;
rs = st.executeQuery(sqlString);
} catch (Exception e) {
System.out.println("sql exception:"+e);
return false;
}
return true;
}
}
数据库文件:
BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
CREATE TABLE dbo.Table3
(
User_Name varchar(20) NOT NULL,
Password varchar(20) NOT NULL
) ON [PRIMARY]
GO
COMMIT源代码:1:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
import javax.swing.*;
public class Land
{
public static void main(String[] args)
{
LandFrame frame=new LandFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
class LandFrame extends JFrame
{
JLabel labelWelcome = new JLabel("小区车辆管理系统");
JLabel labelName=new JLabel("用户名:");
JLabel labelPassword=new JLabel("密码:");
JTextField textName=new JTextField();
JPasswordField textPassword=new JPasswordField();
JButton buttonEnter=new JButton("登录");
JButton buttoncancel=new JButton("清空");
public LandFrame()
{
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
int screenWidth=screenSize.width;
int screenHeight=screenSize.height;
setSize(screenWidth/4,screenHeight/4);
setLocation(screenWidth*3/8,screenHeight*3/8);
setTitle("登陆界面");
Font f = new Font("新宋体",Font.PLAIN,12);
Container con = getContentPane();
con.setLayout(null);
labelWelcome.setBounds(95,10,150,20);
labelWelcome.setFont(new Font("新宋体",Font.PLAIN,14));
con.add(labelWelcome);
labelName.setBounds(45,40,55,20);
labelName.setFont(f);
con.add(labelName);
textName.setBounds(95,40,120,20);
con.add(textName);
labelPassword.setBounds(45,70,45,20);
labelPassword.setFont(f);
con.add(labelPassword);
textPassword.setBounds(95,70,120,20);
con.add(textPassword);
buttonEnter.setBounds(90,110,60,20);
buttonEnter.setFont(f);
con.add(buttonEnter);
buttonEnter.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent m){
if(textName.getText().equals("")){
new JOptionPane().showMessageDialog(null,"用户名不能为空!");
}
else if(textPassword.getText().equals("")){
new JOptionPane().showMessageDialog(null,"密码不能为空!");
}
else{
String sql="select * from ClientInformation where User_Name = '" + textName.getText() + "' and Password = '" + textPassword.getText()+ "'";
System.out.println(sql);
Judge(sql);
}
}
});
buttoncancel.setBounds(155,110,60,20);
buttoncancel.setFont(f);
con.add(buttoncancel);
buttoncancel.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent m){
textName.setText("");
textPassword.setText("");
}
});
}
private void Judge(String sqlString) { if (Database.joinDB()) {
if (Database.query(sqlString))
try{
if(Database.rs.isBeforeFirst()) {
System.out.println("密码正确");
Database.cn.close();
}
else {
System.out.println("错误");
new JOptionPane().showMessageDialog(null,"用户名或密码错误!","",JOptionPane.ERROR_MESSAGE);
}
}catch(Exception e) {
System.out.println(e.getMessage());
}
}
else{
System.out.println("连接数据库不成功!!!");
}
}
}
2:import java.sql.*;public class Database {
public static Connection cn;
public static Statement st;
public static ResultSet rs; public static boolean joinDB() {
boolean joinFlag;
try {
joinFlag = true;
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
cn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=sample","sa","605");
System.out.println("数据库连接成功");
st = cn.createStatement();
st.execute("INSERT INTO Table3 VALUES ('admin,123')");
return joinFlag; }
catch (SQLException e) {
System.out.println(e.getMessage());
joinFlag = false;
return joinFlag;
}
catch (ClassNotFoundException e) {
System.out.println(e.getMessage());
joinFlag = false;
return joinFlag;
}
} public static boolean executeSQL(String sqlString) {
boolean executeFlag;
try {
st.execute(sqlString);
executeFlag = true;
} catch (Exception e) {
executeFlag = false;
System.out.println("sql exception:" + e.getMessage());
}
return executeFlag;
}
public static boolean query(String sqlString) { try {
rs = null;
rs = st.executeQuery(sqlString);
} catch (Exception e) {
System.out.println("sql exception:"+e);
return false;
}
return true;
}
}
楼主【beingyourself】截止到2008-07-19 23:13:08的历史汇总数据(不包括此帖):
发帖的总数量:48 发帖的总分数:970 每贴平均分数:20
回帖的总数量:14 得分贴总数量:0 回帖的得分率:0%
结贴的总数量:48 结贴的总分数:970
无满意结贴数:4 无满意结贴分:50
未结的帖子数:0 未结的总分数:0
结贴的百分比:100.00% 结分的百分比:100.00%
无满意结贴率:8.33 % 无满意结分率:5.15 %
敬礼!
joinFlag = true;
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
cn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=sample","sa","605");
System.out.println("数据库连接成功");
st = cn.createStatement();
st.execute("INSERT INTO Table3 VALUES ('admin,123')");//这句"INSERT INTO Table3 VALUES ('admin','123')"
return joinFlag; }