connectionfactory.java

大唐电信的管理系统

package task.business;

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

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

public class ConnectionFactory {
	private static DataSource ds = null;

	public static synchronized Connection getConnection() throws Exception {
		if (ds == null) {
			Context ctx = new InitialContext();
			ds = (DataSource) ctx.lookup("java:comp/env/jdbc/DataSource");
		}
		Connection con = ds.getConnection();
		return con;
	}

	public static void close(Connection conn) {
		try {
			if (conn != null)
				conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public static void close(PreparedStatement stmt) {
		try {
			if (stmt != null)
				stmt.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public static void close(ResultSet rs) {
		try {
			if (rs != null)
				rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}

	}
}