dbc.java~8~

来自「用java做的图书管理系统」· JAVA~8~ 代码 · 共 72 行

package mydbc.dbc;
import java.sql.*;

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2008</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class DBC {
    public String url = "jdbc:odbc:test";
    public Connection conn;
    public static DBC only;

    public static DBC getInstance(){

        if(only == null){
            return new DBC();
        }else{
            return only;
        }
    }

    public void getConnection(){
        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            conn = DriverManager.getConnection(url);
        } catch (SQLException ex) {
            javax.swing.JOptionPane.showMessageDialog(null,ex.getMessage().toString());
        } catch (ClassNotFoundException ex) {
            javax.swing.JOptionPane.showMessageDialog(null,ex.getMessage().toString());
        }
    }

    public ResultSet executeQuery(String sql){
        ResultSet rs = null;
        try {
            getConnection();
            Statement stmt = conn.createStatement();
            rs = stmt.executeQuery(sql);
        } catch (SQLException ex) {
            javax.swing.JOptionPane.showMessageDialog(null,ex.getMessage().toString());
        }
        return rs;
    }

    public boolean executeUpdate(String sql){
        getConnection();
        int i = 0;
        try {
            Statement stmt = conn.createStatement();
            i = stmt.executeUpdate(sql);
            stmt.close();
            conn.close();
        } catch (SQLException ex) {
            javax.swing.JOptionPane.showMessageDialog(null,ex.getMessage().toString());
            return false;
        }
        if(i > 0){
            return true;
        }else{
            return false;
        }
    }
}