数据库编程

开发平台：
Java

op_book.java~19~：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 bookshop.util.*;
import bookshop.book.*;
import javax.servlet.http.HttpServletRequest;
public class op_book extends DataBase{
  private book abooks = new book();	                       //新的图书类
        private javax.servlet.http.HttpServletRequest request; //建立页面请求
        private boolean sqlflag = true ;		       //对接收到的数据是否正确
        private Vector booklist;			       //显示图书列表向量数组
        private int page = 1;				       //显示的页码
        private int pageSize=10;				//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
        public String sqlStr="";
        public Vector getBooklist() {
                return booklist;
        }
        public boolean getSqlflag() {
                return sqlflag;
        }
        public String to_String( String str) {
                try
                {
                        return new String(str.getBytes("ISO8859-1"));
                }
                catch (Exception e)
                {
                        return str;
                }
        }
        //将页面表单传来的资料分解
        public boolean getRequest(javax.servlet.http.HttpServletRequest newrequest) {
                boolean flag = false;
                try
                {
                        request = newrequest;
                        String ID = request.getParameter("id");
                        long bookid = 0;
                        try
                        {
                                bookid = Long.parseLong(ID);
                        }
                        catch (Exception e)
                        {
                        }
                        abooks.setId(bookid);
                        String bookname = request.getParameter("bookname");
                        if (bookname==null || bookname.equals(""))
                        {
                                bookname = "";
                                sqlflag = false;
                        }
                        abooks.setBookName(to_String(bookname));
                        String author = request.getParameter("author");
                        if (author==null || author.equals(""))
                        {
                                author = "";
                                sqlflag = false;
                        }
                        abooks.setAuthor(to_String(author));
                        String publish = request.getParameter("publish");;
                        if (publish==null)
                        {
                                publish = "";
                        }
                        abooks.setPublish(to_String(publish));
                        String bookclass = request.getParameter("bookclass");
                        int bc = Integer.parseInt(bookclass);
                        abooks.setBookClass(bc);
                        String bookno = request.getParameter("bookno");
                        if (bookno == null)
                        {
                                bookno = "";
                        }
                        abooks.setBookNo(to_String(bookno));
                        String picture = request.getParameter("picture");
                        if (picture == null)
                        {
                                picture = "images/01.gif";
                        }
                        abooks.setPicture(to_String(picture));
                        float price;
                        try	{
                                price =new Float(request.getParameter("price")).floatValue();
                        }
                        catch (Exception e)
                        {
                                price = 0;
                                sqlflag = false;
                        }
                        abooks.setPrince(price);
                        int amount;
                        try
                        {
                                amount = new Integer(request.getParameter("amount")).intValue();
                        }
                        catch (Exception e)
                        {
                                sqlflag = false;
                                amount = 0;
                        }
                        abooks.setAmount(amount);
                        String content = request.getParameter("content");
                        if (content == null)
                        {
                                content = "";
                        }
                        abooks.setContent(to_String(content));
                        if (sqlflag)
                        {
                                flag = true;
                        }
                        return flag;
                }
                catch (Exception e)
                {
                        return flag;
                }
        }
        public String getSql() {
                sqlStr = "select id,classname from book order by id";
                return sqlStr;
        }
        public boolean book_search(HttpServletRequest res) throws Exception {
          DataBase db = new DataBase();
                   db.connect();
                   stmt = db.conn.createStatement ();
                // System.out.println("aaaaaaaa");
                request = res;
                String PAGE = request.getParameter("page");   //页码
                String classid = request.getParameter("classid");	//分类ID号
                String keyword = request.getParameter("keyword");	//查询关键词
                if (classid==null) classid="";
                if (keyword==null) keyword = "";
                keyword = to_String(keyword).toUpperCase();
                try
                {
                        page = Integer.parseInt(PAGE);
                }
                catch (NumberFormatException e)
                {
                        page = 1;
                }
                //取出记录数
                if (!classid.equals("") && keyword.equals("") ) {
                        sqlStr = "select count(*) from book where bookclass='" + classid + "'";
                } else if (!keyword.equals("")) {
                        if (classid.equals(""))
                        {
                                sqlStr = "select count(*) from book where upper(bookname) like '%" +keyword+ "%' or upper(content) like '%" + keyword + "%'";
                        } else {
                                sqlStr = "select count(*) from book where bookclass='" + classid + "' and  (upper(bookname) like '%" +keyword+ "%' or upper(content) like '%" + keyword + "%')";
                        }
                } else {
                        sqlStr = "select count(*) from book";
                }
                int rscount = pageSize;
                try
                {
                        ResultSet rs1 = stmt.executeQuery(sqlStr);
                        if (rs1.next()) recordCount = rs1.getInt(1);
                        rs1.close();
                }
                catch (SQLException e)
                {        System.out.println(e.getMessage());
                        return false;
                }
                //设定有多少pageCount
                System.out.println("kkkkk"+recordCount);
                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;
 //System.out.println("bbbbbbbbbbbbb");
                rscount = (int) recordCount % pageSize;	 // 最后一页记录数
 //System.out.println("ccccccccccc");
                //sql为倒序取值
                sqlStr = "select   a.id,a.bookname,a.bookclass,b.classname,a.author,a.publish,a.bookno,a.content,a.prince,a.amount,a.Leav_number,a.regtime,a.picture from book a,bookclass b where a.Bookclass = b.Id ";
                // System.out.print("ccc"+sqlStr);
                if (!classid.equals("") && keyword.equals("") ){  //如果类别不为空，非查询
                        if (page == 1)
                        {
                                sqlStr = sqlStr + " and a.bookclass='" + classid + "' order by a.Id desc";
                        } else {
                                sqlStr = sqlStr + " and a.bookclass='" + classid + "limit "+(recordCount-pageSize * page)+","+(recordCount-pageSize * (page-1));
                        }
                } else if (!keyword.equals("")) {  //如果是查询资料
                        if (page == 1)
                        {
                                if (!classid.equals(""))  //查询某一类
                                {
                                        sqlStr = sqlStr + "and a.Bookclass='" + classid + "' and (upper(a.bookname) like '%" +keyword+ "%' or upper(a.content) like '%" + keyword + "%')  order by a.Id desc";
                                } else {		//查询所有类
                                        sqlStr = sqlStr + " and (upper(a.bookname) like '%" +keyword+ "%' or upper(a.content) like '%" + keyword + "%') order by a.Id desc";
                                }
                        } else {
                                if (!classid.equals(""))
                                {
                                        sqlStr = sqlStr + " and a.Bookclass='" + classid + "' and (upper(a.bookname) like '%" +keyword+ "%' or upper(a.content) like '%" + keyword + "%') limit "+(recordCount-pageSize * page)+","+(recordCount-pageSize * (page-1));
                                } else {
                                        sqlStr = sqlStr + " and (upper(a.bookname) like '%" +keyword+ "%' or upper(a.content) like '%" + keyword + "%') limit "+(recordCount-pageSize * page)+","+(recordCount-pageSize * (page-1));
                                }
                        }
                } else {		//非查询，也非分类浏览
                        if (page == 1)
                        {
                                sqlStr = sqlStr + "  order by a.Id desc limit 0,"+pageSize;
                        } else {
                                sqlStr = sqlStr + "limit "+(recordCount-pageSize * page)+","+(recordCount-pageSize * (page-1));
                        }
                }
                try
                {       //System.out.println(sqlStr);
                       rs = stmt.executeQuery(sqlStr);
                        booklist = new Vector(rscount);
                        while (rs.next())
                        {
                                book book = new book();
                                book.setId(rs.getLong("id"));
                                book.setBookName(rs.getString("bookname"));
                                book.setBookClass(rs.getInt("bookclass"));
                                book.setClassname(rs.getString("classname"));
                                book.setAuthor(rs.getString("author"));
                                book.setPublish(rs.getString("publish"));
                                book.setBookNo(rs.getString("Bookno"));
                                book.setContent(rs.getString("content"));
                                book.setPrince(rs.getFloat("prince"));
                                book.setAmount(rs.getInt("amount"));
                                book.setLeav_number(rs.getInt("leav_number"));
                                book.setRegTime(rs.getString("regtime"));
                                book.setPicture(rs.getString("picture"));
                                booklist.addElement(book);
                        }
                        rs.close();
                        return true;
                }
                catch (Exception e)
                {
                        System.out.println(e.getMessage());
                        return false;
                }
        }
        public boolean insert() throws Exception {
                sqlStr = "insert into book (Bookname,Bookclass,Author,Publish,Bookno,Content,Prince,Amount,Leav_number,Regtime,picture) values ('";
                sqlStr = sqlStr + dataFormat.toSql(abooks.getBookName()) + "','";
                sqlStr = sqlStr + abooks.getBookClass() + "','";
                sqlStr = sqlStr + dataFormat.toSql(abooks.getAuthor()) + "','";
                sqlStr = sqlStr + dataFormat.toSql(abooks.getPublish()) + "','";
                sqlStr = sqlStr + dataFormat.toSql(abooks.getBookNo()) + "','";
                sqlStr = sqlStr + dataFormat.toSql(abooks.getContent()) + "','";
                sqlStr = sqlStr + abooks.getPrince() + "','";
                sqlStr = sqlStr + abooks.getAmount() + "','";
                sqlStr = sqlStr + abooks.getLeav_number() + "',";
                sqlStr = sqlStr + "now()"+ "'";
                sqlStr = sqlStr + abooks.getPicture()+"'";
                try
                {       DataBase db = new DataBase();
                        db.connect();
                        stmt =db.conn.createStatement ();
                        stmt.execute(sqlStr);
                        return true;
                }
                catch (SQLException sqle)
                {
                        return false;
                }
        }
        public boolean update() throws Exception {
                sqlStr = "update book set ";
                sqlStr = sqlStr + "bookname = '" + dataFormat.toSql(abooks.getBookName()) + "',";
                sqlStr = sqlStr + "bookclass = '" + abooks.getBookClass() + "',";
                sqlStr = sqlStr + "Author = '" + dataFormat.toSql(abooks.getAuthor()) + "',";
                sqlStr = sqlStr + "publish = '" + dataFormat.toSql(abooks.getPublish()) + "',";
                sqlStr = sqlStr + "bookno = '" + dataFormat.toSql(abooks.getBookNo()) + "',";
                sqlStr = sqlStr + "content = '" + dataFormat.toSql(abooks.getContent()) + "',";
                sqlStr = sqlStr + "prince = '" + abooks.getPrince() + "',";
                sqlStr = sqlStr + "Amount = '" + abooks.getAmount() + "',";
                sqlStr = sqlStr + "leav_number = '" + abooks.getLeav_number()+ "' ";
                sqlStr = sqlStr + "picture = '" + abooks.getPicture() + "' ";
                sqlStr = sqlStr + "where id = " + abooks.getId();
                System.out.println(sqlStr);
                try
                {
                        DataBase db = new DataBase();
                        db.connect();
                        stmt =db.conn.createStatement ();
                        stmt.execute(sqlStr);
                        return true;
                }
                catch (SQLException e)
                {        System.out.print(e.getMessage());
                        return false;
                }
        }
        public boolean delete( int aid ) throws Exception {
                sqlStr = "delete from book 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;
                }
        }
        public boolean getOnebook(int newid ) throws Exception {
          DataBase db = new DataBase();
                           db.connect();
                           stmt =db.conn.createStatement ();
                try
                {
                        sqlStr="select  a.id,a.bookname,a.bookclass,b.classname,a.author,a.publish,a.bookno,a.content,a.prince,a.amount,a.Leav_number,a.regtime,a.picture from book a,bookclass b where a.Bookclass=b.Id and a.Id = " + newid ;
                        rs = stmt.executeQuery(sqlStr);
                        if (rs.next())
                        {	booklist = new Vector(1);
                                book book = new book();
                                book.setId(rs.getLong("id"));
                                book.setBookName(rs.getString("bookname"));
                                book.setBookClass(rs.getInt("bookclass"));
                                book.setClassname(rs.getString("classname"));
                                book.setAuthor(rs.getString("author"));
                                book.setPublish(rs.getString("publish"));
                                book.setBookNo(rs.getString("Bookno"));
                                book.setContent(rs.getString("content"));
                                book.setPrince(rs.getFloat("prince"));
                                book.setAmount(rs.getInt("amount"));
                                book.setLeav_number(rs.getInt("leav_number"));
                                book.setRegTime(rs.getString("regtime"));
                                book.setPicture(rs.getString("picture"));
                                booklist.addElement(book);
                        } else {
                                rs.close();
                                return false;
                        }
                        rs.close();
                        return true;
                }
                catch (SQLException e)
                {
                        return false;
                }
        }
        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 op_book() {
  }
}

						