import java.sql.*;
import java.util.*;
public class GetPage ...{
private int pageSize = 6; //每一页显示的记录数
private int pageCount = 1; //总的页数
private int currentPage = 1; //当前显示的页
//"showVar" 值为"-1"表示显示最后页，为"-2"表示显示上一页，为"-3"表示显示下一页，否则显示当前页。
public Vector<Vector> doGet(int showVar) ...{
Vector<Vector> all = new Vector<Vector> (); //当前页的记录集
Statement stmt = null;
ResultSet rs = null;
Connection con = null;
try ...{
Class.forName("com.microsoft.jdbc.sqlserver.sqlServerDriver"); //定义数据库驱动
String url =
"jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=lesson"; //连接数据库"lesson"
String user = "sa"; //用户名
String password = "123"; //密码
con = DriverManager.getConnection(url, user, password); //连接
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
String sql = "SELECT COUNT(*) FROM test"; //获取纪录总条数
rs = stmt.executeQuery(sql);
rs.next();
int allRows = rs.getInt(1);
pageCount = (allRows % pageSize == 0) ? (allRows / pageSize) :
(allRows / pageSize + 1);
if (pageCount == 0) ...{
pageCount = 1;
}
switch (showVar) ...{
case -1:
currentPage = pageCount;
break;
case -2:
currentPage = (currentPage > 1) ? (currentPage - 1) : 1;
break;
case -3:
currentPage = (currentPage < pageCount) ? (currentPage + 1) :
pageCount;
break;
default:
if (showVar > 0 && showVar <= pageCount) ...{
currentPage = showVar;
}
}
//****************从数据库中读取当前页的数据***********
if (currentPage == 1) ...{
sql = "SELECT TOP " + pageSize +
" * FROM test ORDER BY ID";
}
else ...{
sql = "SELECT TOP " + pageSize +
" * FROM test WHERE(ID >(SELECT MAX(id) FROM(SELECT TOP " +
pageSize * (currentPage - 1) +
" id FROM test ORDER BY id) AS T)) ORDER BY ID";
}
rs = stmt.executeQuery(sql);
//*************************************************
//****************获取当前页的数据*******************
Vector<Integer> id = new Vector<Integer> ();
Vector<String> zhuti = new Vector<String> ();
for (int i = 0; i < pageSize && rs.next(); i++) ...{
id.add(rs.getInt("id"));
zhuti.add(rs.getString("zhuti"));
}
all.add(id);
all.add(zhuti);
//*************************************************
}
catch (Exception ex) ...{
ex.printstacktrace();
}
finally ...{
if (rs != null) ...{
try ...{
rs.close();
}
catch (Exception e) ...{}
}
if (stmt != null) ...{
try ...{
stmt.close();
}
catch (Exception e) ...{}
}
if (con != null) ...{
try ...{
con.close();
}
catch (Exception e) ...{}
}
}
return all;
}
public int getPageCount() ...{
return pageCount;
}
public int getCurrentPage() ...{
return currentPage;
}
}
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 [email protected] 举报，一经查实，本站将立刻删除。
