Java简单数据库操作

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public  class DbTool {
    private static Connection conn=null;    //创建Connection对象
    public static Connection getConn() {
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");    //加载SQL Server数据库驱动
        } catch(ClassNotFoundException e) {
            e.printStackTrace();
        }
        //指定连接数据库的URL
        String url="jdbc:sqlserver://localhost:1433;databaseName=SRM";
        String user="sa";                //指定连接数据库的用户名
        String passWord="1111";            //指定连接数据库的密码
        try {
            conn=DriverManager.getConnection(url,user,passWord);
            if(conn!=null) {                //如果Connection实例不为空
                //System.out.println("数据库连接成功");  //提示信息
            }
            
            /*
             //加载MySQL数据库的连接
             Class.forName("com.mysql.jdbc.Driver"); //加载MySQL数据库驱动
             String url="jdbc:mysql://localhost:3306/SRM";
             String user="sa";
             String passWord="1111";
             conn=DriverManager.getConnection(url,user,passWord);
             if(conn!=null){
             
             }
             
             //加载Oracle数据库的连接
             Class.forName("oracle.jdbc.driver.OracleDriver");// 加载Oracle驱动程序
             String url = "jdbc:oracle:" + "thin:@127.0.0.1:1521:SRM";// 127.0.0.1是本机地址，SRM是精简版Oracle的默认数据库名
             String user = "sa";// 用户名
             String password = "1111";// 你安装时选设置的密码
             conn = DriverManager.getConnection(url, user, password);// 获取连接
             */
        } catch(SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
}

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;

public class DbOperation {
    private static  DbOperation instance = null;   
    public static DbOperation getInstance() { //返回DbOperation类实例的静态方法,单例模式！！！！
        if (instance == null) {
            instance = new DbOperation();
        }    
        return instance;
    }
    public boolean addTbNews(TbNews tns) {  //添加数据方法
        Connection conn=null;
        boolean result=false;
        try {
            conn=DbTool.getConn();    //建立与数据库的连接
            String sqlInsert="INSERT INTO tbNews(topicId,contentTxt)VALUES(?,?)";
            PreparedStatement stm=conn.prepareStatement(sqlInsert);
            stm.setString(1, tns.getTopicId());
            stm.setString(2, tns.getContentTxt());
            int i=stm.executeUpdate();
            if (i==1) {
                result=true;
            }
        }catch(SQLException e) {
            e.printStackTrace();
        }finally {
            try {
                conn.close();
            }catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return result;
    }
    
    public Vector<TbNews> queryTbNews(){     //返回Vector类型方式查询数据
        Vector<TbNews> list =new Vector<TbNews>();
        Connection conn=null;
        try {
            conn=DbTool.getConn();
            Statement stmt=conn.createStatement();
            String querySql="select * from TbNews";
            ResultSet rs=stmt.executeQuery(querySql);
            while(rs.next()) {
                TbNews tbs=new TbNews();
                tbs.setTopicId(rs.getString(1));
                tbs.setContentTxt(rs.getString(2));
                list.add(tbs);
            }
        } catch(Exception e) {
            e.printStackTrace();
        } finally {
            try {
                conn.close();
            } catch(SQLException e) {
                e.printStackTrace();
            }
        }
        return list;
    }
    
    public List<String> selectTbNews(){        //查询数据方法
        List<String> tbsList=new ArrayList<String>();
        Connection conn=null;
        try {
            conn=DbTool.getConn();
            Statement stmt=conn.createStatement();
            String selectSql="select * from TbNews";    
            ResultSet rs=stmt.executeQuery(selectSql);    //执行SQL并返回结果集
            while(rs.next()) {    
                String tbs=rs.getString("topicId")+","+rs.getString("contentTxt");
                tbsList.add(tbs);
            }
        } catch(Exception e) {
            e.printStackTrace();
        } finally {
            try {
                conn.close();        //关闭连接
            }catch(SQLException e) {
                e.printStackTrace();
            }
        }
        return tbsList;
    }
}

public class TbNews {
    private String topicId;
    private String contentTxt;
    public String getTopicId() {
        return topicId;
    }
    public void setTopicId(String topicId) {
        this.topicId=topicId;
    }
    public String getContentTxt() {
        return contentTxt;
    }
    public void setContentTxt(String contentTxt) {
        this.contentTxt=contentTxt;
    }
}

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class BoxLayoutFrame extends JFrame {
    private JTextField textField;
    private JTextArea textArea;
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        BoxLayoutFrame frame=new BoxLayoutFrame();
        frame.setVisible(true);    

    }
    public BoxLayoutFrame() {
        super();
        setTitle("箱式布局管理界面");
        setBounds(360,260,360,320);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container cp=getContentPane();
        Box topicBox=Box.createHorizontalBox();    //创建一个水平箱容器
        cp.add(topicBox, BorderLayout.NORTH);    //添加到窗体中的最北部
        topicBox.add(Box.createHorizontalStrut(5));    //添加一个5像素的水平支柱
        JLabel topicLabel=new JLabel("主题:");    //创建标签topicLabel
        topicBox.add(topicLabel);                //添加到水平箱容器中
        topicBox.add(Box.createHorizontalStrut(5));    //添加一个5像素的水平支柱
        textField=new JTextField(80);            //创建文本框
        topicBox.add(textField);                //添加到水平容器中
        Box box=Box.createVerticalBox();        //创建一个垂直箱容器
        cp.add(box, BorderLayout.CENTER);        //添加到窗体中
        box.add(Box.createVerticalStrut(5));    //添加一个5像素的垂直支柱
        Box contentBox=Box.createHorizontalBox();    //创建一个水平箱容器
        contentBox.setAlignmentX(1);            //设置组件的水平调整值，靠右对齐
        box.add(contentBox);                    //添加到垂直容器中
        contentBox.add(Box.createHorizontalStrut(5));    //添加一个5像素的水平支柱
        JLabel contentLabel=new JLabel("内容:");    //定义标签contentLabel
        contentLabel.setAlignmentY(0);            //设置组件的垂直调整值，靠上方对齐
        contentBox.add(contentLabel);            //添加到水平箱容器中
        contentBox.add(Box.createHorizontalStrut(5));    //添加一个5像素
        JScrollPane scrollPane=new JScrollPane();    //创建滚动面板
        scrollPane.setAlignmentY(0);            //设置组件的垂直调整值，向上对齐
        contentBox.add(scrollPane);                //将滚动面板添加到contentBox中
        textArea=new JTextArea();                //创建文本框textArea
        textArea.setLineWrap(true);                //允许自动换行
        scrollPane.setViewportView(textArea);    //文本框添加到滚动面板scrollPane
        box.add(Box.createVerticalStrut(5));    //添加一个5像素高的垂直支柱
        
        Box bottomBox=Box.createHorizontalBox();
        bottomBox.setAlignmentX(1);
        box.add(bottomBox,BorderLayout.SOUTH);
        JButton viewButton=new JButton("浏览记录");
        bottomBox.add(viewButton);
        viewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                SelectFrame sframe=new SelectFrame(BoxLayoutFrame.this);
                sframe.setVisible(true);
            }
        });
        
        JButton button=new JButton("确定");        //创建一个按钮button
        button.setAlignmentX(1);                //设置组件的水平调整值，靠右对齐
        //box.add(button);                        //按钮添加到垂直箱容器
        bottomBox.add(button);
        
        button.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent arg1) {
                //System.exit(0);
                if(textField.getText().length()==0) {//如果文本框无输入信息则不作任何处理
                    
                }
                if(!textField.getText().equals("")) {
                TbNews tbs=new TbNews();
                tbs.setTopicId(textField.getText());
                tbs.setContentTxt(textArea.getText());
                boolean res =DbOperation.getInstance().addTbNews(tbs);
                if (res==true) {
                    textField.setText(null);
                    textArea.setText(null);
                }  }
            }
        });    
    }

}

import java.awt.BorderLayout;
import java.awt.Container;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;
import java.util.Vector;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class SelectFrame extends JDialog {
    Thread t;
    private JTable table;    
    private DefaultTableModel tableModel;
    public SelectFrame(BoxLayoutFrame frame) {
        super(frame,"浏览记录",true);
        setBounds(380,300,300,260);
        Container cp=getContentPane();

        String[] columns= {"topicId","contentTxt"};
        tableModel=new DefaultTableModel(columns,0);
        List<String> tbs=DbOperation.getInstance().selectTbNews();
        for(String info:tbs) {
            String[] args=info.split(",");
            tableModel.addRow(args);
        }
        table=new JTable();
        table.setModel(tableModel);
        
        final JScrollPane scrollPane=new JScrollPane();
        cp.add(scrollPane, BorderLayout.CENTER);
        scrollPane.setViewportView(table);
    }
}