carddao.java

ACCP课程中的商业程序网吧管理系统

package com.jbaptech.accp.netbar.server.dao;

import com.jbaptech.accp.netbar.server.entity.Card;

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

/**
 * Class Description here.
 * <p>Title: com.jbaptech.accp.netbar.server.dao.CardDAO</p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: 北京阿博泰克北大青鸟信息技术有限公司</p>
 *
 * @author luohao
 * @version 1.0
 */
public class CardDAO {
  /**
   * constructor.
   */
  public CardDAO() {
  }

  /**
   * judge card is valid or not.
   * @param card Card
   * @return boolean
   */
  public  boolean cardIsValid( Card card) {

    boolean cardIsValid = false;
    Connection dbConnection = null;
    PreparedStatement pStatement = null;
    ResultSet res = null;
    try {
      dbConnection = ConnectionManager.getConnction();
      // 查询数据SQL语句
      String strSql = "select * from card where id='" + card.getId()
          + "' and password ='" + card.getPassword() + "'";
      if (dbConnection != null) {
        System.out.println(dbConnection != null);
      }

      //查询操作
      pStatement = dbConnection.prepareStatement(strSql);
      res = pStatement.executeQuery();
      if (res.next()) {
        cardIsValid = true;
      }
    } catch (SQLException sqlE) {
      sqlE.printStackTrace();
    } finally {
      ConnectionManager.closeResultSet(res);
      ConnectionManager.closeStatement(pStatement);
      ConnectionManager.closeConnection(dbConnection);
    }

    return cardIsValid;
  }

  /**
   * judge card have balance or not.
   * @param card Card
   * @return boolean
   */
  public  boolean cardIsHaveBalance( Card card) {

    boolean haveBalance = false;
    Connection dbConnection = null;
    PreparedStatement pStatement = null;
    ResultSet res = null;
    try {
      dbConnection = ConnectionManager.getConnction();
      // 查询数据SQL语句
      String strSql = "select * from card where id='" + card.getId()
          + "' and password ='" + card.getPassword() + "'";
      if (dbConnection != null) {
        System.out.println(dbConnection != null);
      }

      //查询操作
      pStatement = dbConnection.prepareStatement(strSql);
      res = pStatement.executeQuery();
      if (res.next()) {
        int balance = res.getInt("balance");
        if (balance >= 2) {
          haveBalance = true;
        }
      }
    } catch (SQLException sqlE) {
      sqlE.printStackTrace();
    } finally {
      ConnectionManager.closeResultSet(res);
      ConnectionManager.closeStatement(pStatement);
      ConnectionManager.closeConnection(dbConnection);
    }
    return haveBalance;
  }

}