백그라운드 dao BaseDao

package cn.service.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
 *            。
 */
public class BaseDao {
	private static String driver ="oracle.jdbc.driver.OracleDriver";//         
	private static String url = "jdbc:oracle:thin:@localhost:1521:oracle11";//   URL   
	private static String user = "newegg"; //       
	private static String password = "newegg"; //     
	/**
	 *          。
	 */
	public Connection getConnection() {
		Connection conn = null;//       
		//          
		try {
			Class.forName(driver);
			conn = DriverManager.getConnection(url, user, password);
		} catch (Exception e) {
			e.printStackTrace();//     
		}
		return conn;//       
	}
	/**
	 *        。
	 * @param conn      
	 * @param stmt Statement  
	 * @param rs    
	 */
	public void closeAll(Connection conn, PreparedStatement pstmt, 
					ResultSet rs) {
		//          ，   
		if (rs != null) {
			try {
				rs.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		//  Statement     ，   
		if (pstmt != null) {
			try {
				pstmt.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		//            ，   
		if (conn != null) {
			try {
				conn.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	/**
	 *     、  、  SQL    
	 * @param sql
	 * @param pars
	 * @return int
	 */
	public int executeUpdate(String sql, Object[] pars) {
		int rowCount =0;
		Connection conn = null;
		PreparedStatement pstmt = null;
		try {
			conn = this.getConnection();
			pstmt = conn.prepareStatement(sql);
			if(pars!=null){
				for(int i=0;i<pars.length;i++){
					pstmt.setObject(i+1, pars[i]);
				}
			}
			rowCount = pstmt.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			this.closeAll(conn, pstmt, null);
		}
		return rowCount;
	}
}