数据访问工具类

package com.accphr.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.sqlException;
import java.sql.Statement;
import java.util.Properties;

/**
 * 数据库访问工具类(使用了单例模式和工厂模式)
 */
public class @R_809_4044@ {
	/* 驱动程序的名字 */
	private static String driver;

	/* 连接数据库用的URL */
	private static String url;

	/* 用户名 */
	private static String user;

	/* 密码 */
	private static String pwd;

	/* @R_809_4044@类型的一个引用，用来持有自身的一个对象 */
	private static @R_809_4044@ self = null;

	/* 私有的构造方法，保证此类不能在外部进行实例化 */
	private @R_809_4044@() {
		try {
			Properties pros = new Properties(); // 此类用于读取配置文件config.properties
			pros.load(@R_809_404[email protected]sstream("config.properties"));
			driver = pros.getProperty("driver");
			url = pros.getProperty("url");
			user = pros.getProperty("user");
			pwd = pros.getProperty("pwd");
		} catch (Exception ex) {
			throw new RuntimeException(ex);
		}
	}

	/**
	 * 返回@R_809_4044@类的一个实例
	 * 
	 * @return
	 */
	public static @R_809_4044@ newInstance() {
		if (null == self) {
			self = new @R_809_4044@();
		}
		return self;
	}

	/**
	 * 返回数据库连接对象
	 * 
	 * @return Connection
	 */
	public Connection getConnection() {
		try {
			Class.forName(driver); // 加载驱动程序
			return DriverManager.getConnection(url,user,pwd); // 通过驱动程序管理器得到数据库连接对象
		} catch (Exception ex) {
			throw new RuntimeException(ex);
		}
	}

	public void close(Connection conn,Statement stmt,ResultSet rs) {
		close(rs);
		close(stmt);
		close(conn);
	}

	public void close(Connection conn) {
		if (null != conn) {
			try {
				conn.close();
			} catch (sqlException e) {
				e.printstacktrace();
			}
		}
	}

	public void close(Statement stmt) {
		if (null != stmt) {
			try {
				stmt.close();
			} catch (sqlException e) {
				e.printstacktrace();
			}
		}
	}

	public void close(ResultSet rs) {
		if (null != rs) {
			try {
				rs.close();
			} catch (sqlException e) {
				e.printstacktrace();
			}
		}
	}

	public static void main(String[] args) {
		Connection conn = @R_809_404[email protected]().getConnection();
		if (null != conn) {
			System.out.println("数据库连接成功！");
		} else {
			System.out.println("数据库连接失败！");
		}
	}
}

附录#oracle9i #driver=oracle.jdbc.driver.OracleDriver #url=jdbc:oracle:thin:@localhost:1521:ora9 #user=test #pwd=test #sql2005 driver=com.microsoft.sqlserver.jdbc.sqlServerDriver url=jdbc:sqlserver://localhost:1423;DatabaseName=house user=sa pwd=sa #sql2000 #driver=com.microsoft.jdbc.sqlserver.sqlServerDriver #url=jdbc:microsoft:sqlserver://localhost:1433;databaseName=unit6DB #user=sa #pwd=888888