database.java

来自「网络商店源代码用NetBeans6.1Beta开发」· Java 代码 · 共 25 行

package model.db;

import java.sql.*;

public class Database {
  private static final String driver = "com.mysql.jdbc.Driver";
  private static final String url = "jdbc:mysql://localhost/store";
  private static final String user = "guest";
  private static final String password = "";
  private static Object driver_obj = null;
  private static Connection cx = null;

  public static Connection connect() throws Exception {
    if (driver_obj == null) {
      System.out.println("=> load driver");
      driver_obj = Class.forName(driver).newInstance();
    }
    if (cx == null || cx.isClosed()) {
      System.out.println("=> connect");
      cx = DriverManager.getConnection(url, user, password);
    }
    return cx;
  }
}