JDBC工具類

<strong><span style="font-family:Microsoft YaHei;font-size:14px;">package xuan.news.dao.impl;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
/**
 * 
 * @author 陳軒
 *
 */
public class DBhelper {
		public static Connection conn =null;//數據庫連接對象
		public static ResultSet rs = null;//處理結果集
		public static PreparedStatement ps = null;//想數據庫發送SQL腳本
		public static String user = "sa";//數據庫用戶
		public static String password = "";//數據庫用戶密碼
		public static String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";//驅動字符串
		public static String url = "jdbc:sqlserver://localhost:1433;databaseName=NewsManagerSystem";//數據庫連接字符串
		/**
		 * 獲取數據庫連接
		 * @throws ClassNotFoundException 
		 * @throws SQLException 
		 */
		public static Connection getConnection() throws ClassNotFoundException, SQLException{
//			Class.forName(driver);
//			conn = DriverManager.getConnection(url, user, password);
			DataSource ds=null;
			try {
				Context ctx = new InitialContext();
				ds = (DataSource)ctx.lookup("java:comp/env/jdbcnews");
				conn=ds.getConnection();
			} catch (NamingException e) {
				System.out.println(e.getMessage());
			}
			return conn;
		}
		/**
		 * 關閉所有連接
		 */
		public static void consoleAll(){
			try {
				if(rs!=null)
					rs.close();
				if(ps!=null)
					ps.close();
				if(conn!=null)
					conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		/**
		 * 增刪改
		 */
		public static int update(String sql ){
			return update(sql,null);
		}
		public static int update(String sql ,Object[] obj){
			int count =0;//用於保存受影響行數
			try {
				getConnection();//打開連接
				ps = conn.prepareStatement(sql);//獲取SQL存入ps
				if(obj!=null){
					for (int i = 0; i < obj.length; i++) {
						ps.setObject(i+1, obj[i]);//SQL查詢所用的參數賦值給SQL
					}
				}
				count=ps.executeUpdate();//執行SQL獲取結果
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			} catch (SQLException e) {
				e.printStackTrace();
			}finally{
				consoleAll();
			}
			return count;
		} 
		/**
		 * 查詢(調用此方法後應及時調用consoleAll()關閉連接)
		 */
		public static ResultSet Query(String sql ){
			return Query(sql,null);
		}
		public static ResultSet Query(String sql,Object[] obj) {
			try {
				getConnection();
				ps=conn.prepareStatement(sql);
				if(obj!=null)
					for (int i = 0; i < obj.length; i++) {
						ps.setObject(i+1, obj[i]);
					}
				rs=ps.executeQuery();
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			return rs;
		}
}
</span></strong>