jdbcutils.java

来自「一个公司管理系统,用简单的htmlt要servlet做的,有增.查.改功能.适合」· Java 代码 · 共 73 行

/**
 * 
 */
package com.tarena.util;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;

/**
 * @author dong xuyuan
 *
 */
public class JdbcUtils {
	
	private final static String DATABASE_JNDI_NAME = "java:comp/env/jdbc/tarena";
	
	/**
	 * get the db connection
	 * 
	 * @return
	 */
	public static Connection getConnection() {
		Connection conn = null;
		try {
			Context ctx = new InitialContext();
			DataSource ds = (DataSource)ctx.lookup(DATABASE_JNDI_NAME);
			conn = ds.getConnection();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return conn;
	}
	
	public static void close(Connection conn) {
		if(conn != null) {
			try {
				conn.close();
			} catch(Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	
	public static void close(Statement stmt) {
		if(stmt != null) {
			try {
				stmt.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	
	public static void close(ResultSet rs) {
		if(rs != null) {
			try {
				rs.close();
			} catch(Exception e) {
				e.printStackTrace();
			}
		}
	}

}