oracle 数据库连接 单子模式

package cn.sjy.org.dbconn;

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

import cn.sjy.org.exception.MyRunTimeException;

public class OracleDBConn {
	private static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
	private static final String DBURL = "jdbc:oracle:thin:@localhost:1521:ora9i";
	private static final String DBUSER = "sjy";
	private static final String DBPASSWORD = "sjy";
	private static OracleDBConn oracledbconn = new OracleDBConn();
	Connection conn;
	
	private OracleDBConn (){//单子模式
		try {
			Class.forName(DBDRIVER);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			throw new MyRunTimeException("数据库加载失败", e);
		}
	}
	
	public static OracleDBConn getOracleDBConn(){
		return oracledbconn;
	}
	
	public Connection getConnection(){
		try {
			conn = DriverManager.getConnection(this.DBURL, this.DBUSER, this.DBPASSWORD);
		} catch (SQLException e) {
			e.printStackTrace();
			throw new MyRunTimeException("连接数据库失败", e);
		}
		return conn;
	}
	
	public void colse(Connection conn, PreparedStatement ps, ResultSet rs) {
		try {
			if(rs != null)
				rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			try {
				if(ps != null)
					ps.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}finally{
				try {
					if(conn != null)
						conn.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
			}
		}
	}
}