数据库编程

开发平台：
Java

op_user.java：源码内容
							package bookshop.run;
/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */
import java.sql.*;
import java.util.Vector;
import javax.servlet.http.HttpServletRequest;
import bookshop.util.*;
import bookshop.book.*;
public class op_user extends DataBase{
        private user user = new user();	                        //新的用户对象
        private javax.servlet.http.HttpServletRequest request;  //建立页面请求
        private Vector userlist;			//显示用户列表向量数组
        private int page = 1;					//显示的页码
        private int pageSize=8;					//每页显示的图书数
        private int pageCount =0;				//页面总数
        private long recordCount =0;			        //查询的记录总数
        private String message = "";			        //出错信息提示
        private String username = "";			      //注册后返回的用户名
        private long userid = 0;			     //注册后返回的用户ID
  public op_user() {
  }
  //添加新用户
  public boolean add(HttpServletRequest req) throws Exception {
        if (getRequest(req)) {
            DataBase db = new DataBase();
            db.connect();
            stmt = db.conn.createStatement ();
            sqlStr = "select * from shop_user where username = '" +
                      user.getUserName() +"'";
            sqlStr = "insert into shop_user (username,password,Names,sex,"+
                     "Address,Phone,Post,Email,RegTime,RegIpaddress) values ('";
            sqlStr = sqlStr + dataFormat.toSql(user.getUserName()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getPassWord()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getNames()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getSex()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getAddress()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getPhone()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getPost()) + "','";
            sqlStr = sqlStr + dataFormat.toSql(user.getEmail()) + "',now(),'";
            sqlStr = sqlStr + user.getRegIpAddress() + "')";
            try{
                stmt.executeUpdate(sqlStr);
                sqlStr = "select max(id) from shop_user where username = '" +
                         user.getUserName()+ "'";
                         rs = stmt.executeQuery(sqlStr);
                         while (rs.next()){
                              userid = rs.getLong(1);
                              }
                             rs.close();
                             return true;
                }catch (Exception sqle){
                  System.out.print(sqle.getMessage());
                  return false;
                }
           } else{
            return false;
           }
  }
  //分析页面转递的参数
  public boolean getRequest(javax.servlet.http.HttpServletRequest newrequest) {
       boolean flag = false;
       try {
        request = newrequest;
        String ID = request.getParameter("userid");
        if (ID!=null ){
        userid = 0;
        try{
            userid = Long.parseLong(ID);
            user.setId(userid);
            }catch (Exception e){
                 message = message + "你要修改的用户号出错！";
            }
         }
         username = request.getParameter("username");
         if (username==null || username.equals("")){
              username = "";
              message = message + "用户名为空!";
              }
              user.setUserName(getGbk(username));
              String password = request.getParameter("passwd");
              if (password==null || password.equals("")){
                  password = "";
                  message = message + "密码为空!";
                  }
              String pwdconfirm = request.getParameter("passconfirm");
              if (!password.equals(pwdconfirm)){
                 message = message + "确认密码不相同!";
                 }
              user.setPassWord(getGbk(password));
              String names = request.getParameter("names");;
              if (names==null){
                   names = "";
                   }
              user.setNames(getGbk(names));
              String sex = request.getParameter("sex");
              user.setSex(getGbk(sex));
              String address = request.getParameter("address");
              if (address == null){
                   address = "";
                  }
              user.setAddress(getGbk(address));
              String post = request.getParameter("post");
              if (post == null){
                  post = "";
                 }
               user.setPost(getGbk(post));
              String phone = request.getParameter("phone");
              if (phone== null){
                  phone = "";
              }
             user.setPhone(phone);
             String email = request.getParameter("email");
             if (email == null){
                  email = "";
                  }
              user.setEmail(getGbk(email));
             String IP = request.getRemoteAddr();
             user.setRegIpAddress(IP);
             if (message.equals("")){
                  flag = true;
                  }
               return flag;
        }catch (Exception e){
            return flag;
            }
 }
 //查询书店所有的用户
public boolean get_alluser() throws Exception {
      sqlStr = "select count(*) from shop_user";    //取出记录数
      int rscount = pageSize;
      try{
        DataBase db = new DataBase();
        db.connect();
        stmt = db.conn.createStatement ();
        ResultSet rs1 = stmt.executeQuery(sqlStr);
        if (rs1.next()) recordCount = rs1.getInt(1);
        rs1.close();
        }catch (SQLException e){
          System.out.print("count:"+e.getMessage());
          return false;
        }
                                //设定有多少pageCount
        if (recordCount < 1)
           pageCount = 0;
        else
           pageCount = (int)(recordCount - 1) / pageSize + 1;
                                //检查查看的页面数是否在范围内
        if (page < 1)
           page = 1;
        else if (page > pageCount)
          page = pageCount;
          rscount = (int) recordCount % pageSize;	 // 最后一页记录数
                                //sql为倒序取值
          sqlStr = "select  * from shop_user ";
          if (page == 1){
             sqlStr = sqlStr + " order by Id desc limit 0,"+pageSize;
             } else {
               sqlStr = sqlStr + " order by Id desc limit "+(recordCount-pageSize*page) +","+(recordCount - pageSize * (page-1));
               }
        try{
          DataBase db = new DataBase();
          db.connect();
          stmt = db.conn.createStatement ();
          rs = stmt.executeQuery(sqlStr);
          userlist = new Vector();
          while (rs.next()){
                user user = new user();
                user.setId(rs.getLong("id"));
                user.setUserName(rs.getString("username"));
                user.setPassWord(rs.getString("password"));
                user.setNames(rs.getString("names"));
                user.setSex(rs.getString("sex"));
                user.setAddress(rs.getString("address"));
                user.setPhone(rs.getString("Phone"));
                user.setPost(rs.getString("post"));
                user.setEmail(rs.getString("email"));
                user.setRegTime(rs.getString("regtime"));
                user.setRegIpAddress(rs.getString("RegIpaddress"));
                userlist.addElement(user);
                }
                rs.close();
                 return true;
            }catch (SQLException e){
              System.out.print(e.getMessage());
              return false;
              }
}
//修改用户
public boolean update(HttpServletRequest req) throws Exception {
if (getRequest(req)){
sqlStr = "update shop_user set ";
sqlStr = sqlStr + "username = '" + dataFormat.toSql(user.getUserName()) + "',";
sqlStr = sqlStr + "password = '" + dataFormat.toSql(user.getPassWord()) + "',";
sqlStr = sqlStr + "Names = '" + dataFormat.toSql(user.getNames()) + "',";
sqlStr = sqlStr + "sex = '" + dataFormat.toSql(user.getSex()) + "',";
sqlStr = sqlStr + "address = '" + dataFormat.toSql(user.getAddress()) + "',";
sqlStr = sqlStr + "phone = '" + dataFormat.toSql(user.getPhone()) + "',";
sqlStr = sqlStr + "post = '" + dataFormat.toSql(user.getPost()) + "',";
sqlStr = sqlStr + "Email = '" + dataFormat.toSql(user.getEmail()) + "' ";
sqlStr = sqlStr + " where id = '" + user.getId() + "'";
try{
                  DataBase db = new DataBase();
                  db.connect();
                  stmt = db.conn.createStatement ();
                  stmt.execute(sqlStr);
                  return true;
    } catch (SQLException e){
      return false;
       }
} else {
       return false;
       }
}
//删除用户
 public boolean delete( long aid ) throws Exception {
    sqlStr = "delete from shop_user where id = "  + aid ;
    try{
      DataBase db = new DataBase();
      db.connect();
      stmt = db.conn.createStatement ();
      stmt.execute(sqlStr);
      return true;
       }catch (SQLException e){
        System.out.println(e);
        return false;
        }
}
//查询指定id的用户，用于支持页面的查看详细资料请求
 public boolean  getUserinfo(long newid ) throws Exception {
    try{
      sqlStr="select  * from shop_user where Id = " + newid ;
      DataBase db = new DataBase();
      db.connect();
      stmt = db.conn.createStatement ();
      rs = stmt.executeQuery(sqlStr);
      userlist = new Vector();
      while (rs.next()){
        user.setId(rs.getLong("id"));
        System.out.print(rs.getLong("id"));
        user.setUserName(rs.getString("username"));
        user.setPassWord(rs.getString("password"));
        user.setNames(rs.getString("names"));
        user.setSex(rs.getString("sex"));
        user.setAddress(rs.getString("address"));
        user.setPhone(rs.getString("Phone"));
        user.setPost(rs.getString("post"));
        user.setEmail(rs.getString("email"));
        user.setRegTime(rs.getString("regtime"));
        user.setRegIpAddress(rs.getString("RegIpaddress"));
         userlist.addElement(user);
         }
         rs.close();
         return true;
        }catch (Exception e){
          System.out.print(e.getMessage());
          return false;
        }
}
  public String getGbk( String str) {
               try  {
                return new String(str.getBytes("ISO8859-1"));
                }catch (Exception e){
                  return str;
                  }
          }
  public int getPage() {				//显示的页码
                              return page;
                      }
                      public void setPage(int newpage) {
                              page = newpage;
                      }
                      public int getPageSize(){			//每页显示的图书数
                              return pageSize;
                      }
                      public void setPageSize(int newpsize) {
                              pageSize = newpsize;
                      }
                      public int getPageCount() {		//页面总数
                              return pageCount;
                      }
                      public void setPageCount(int newpcount) {
                              pageCount = newpcount;
                      }
                      public long getRecordCount() {
                              return recordCount;
                      }
                      public void setRecordCount(long newrcount) {
                              recordCount= newrcount;
                      }
                      public String getMessage() {
                              return message;
                      }
                      public void setMessage(String msg) {
                              message = msg;
                      }
                      public void setUserid(long uid) {
                              userid = uid;
                      }
                      public long getUserid() {
                              return userid;
                      }
                      public void setUserName(String uName) {
                              username = uName;
                      }
                      public String getUserName() {
                              return username;
                      }
                      public Vector getUserlist() {
                           return userlist;
                       }
};

						