dbconnection.java

java写的一个简单的bbs系统

package com.ibm.common;

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;



public class DBConnection {
	private Connection con;
	private static DBConnection dbcon=null;

	private DBConnection()
	{

	}

	public static DBConnection getInstance()
	{
		if(dbcon==null)
		{
			dbcon=new DBConnection();
			return dbcon;
		}else
		{
			return dbcon;
		}
	}

	/**
	 * 返回链接对象
	 * @return
	 */
	public Connection getConnection()
	{
		try {
			Class.forName("com.mysql.jdbc.Driver");  //加载驱动包
			con=DriverManager.getConnection("jdbc:mysql://localhost:3306/ibmbbs","root","root"); //获取连接 
			System.out.println("数据库连接成功!");
		} 

		catch (ClassNotFoundException e) {
			System.out.println("驱动包未找到!");
		} 
		catch (SQLException e) {
			System.out.println("数据库连接错误!");
		}

		return con;
	}
	
	public void close(Statement s,PreparedStatement ps,CallableStatement cs,ResultSet rs,Connection con)
	{
		if(s != null)
		{
			try{
				s.close();
			}catch(SQLException e){
				e.printStackTrace();
				System.out.println("DBConnection.close.s");
			}
		}
		if(ps != null)
		{
			try{
				ps.close();
			}catch(SQLException e){
				e.printStackTrace();
				System.out.println("DBConnection.close.ps");
			}
		}
		if(cs != null)
		{
			try{
				cs.close();
			}catch(SQLException e){
				e.printStackTrace();
				System.out.println("DBConnection.close.cs");
			}
		}
		if(rs != null)
		{
			try{
				rs.close();
			}catch(SQLException e){
				e.printStackTrace();
				System.out.println("DBConnection.close.rs");
			}
		}
		if(con != null)
		{
			try{
				con.close();
			}catch(SQLException e){
				e.printStackTrace();
				System.out.println("DBConnection.close.con");
			}
		}
	}
}