我的Oracle分页实现
我的Oralce分页实现，主要使用了三个类一个接口！
具体代码如下：
DatabaseConnection.java
Emp.java
Pagination接口
分页具体实现
测试页
本人是初学者，各位有好的意见，请多多指教！谢谢！
具体代码如下：
DatabaseConnection.java
package com.founder.oraclepagination.dbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* 数据库连接类用于连接或销毁数据库对象
* @author husong
*
*/
public class DatabaseConnection {
/**
* 数据库连接驱动
*/
private static final String DRIVER = "oracle.jdbc.driver.OracleDriver" ;
/**
* 数据库连接URL地址
*/
private static final String URL = "jdbc:oracle:thin:@localhost:1521:hsit" ;
/**
* 数据库连接用户名
*/
private static final String USERNAME = "scott" ;
/**
* 数据库连接密码
*/
private static final String PASSWORD = "tiger" ;
private Connection conn = null ;
static{
try{
Class.forName(DRIVER) ;
}catch(ClassNotFoundException e){
e.printStackTrace() ;
}
}
/**
* 获取数据库连接
* @return 可用的数据库连接对象
*/
public Connection getConnection(){
try{
conn = DriverManager.getConnection(URL,USERNAME,PASSWORD) ;
}catch(SQLException e){
e.printStackTrace() ;
}
return conn ;
}
/**
* 销毁数据库各种对象
* @param 各种数据库对象如Connection Statement ResultSet
*/
public void destroy(Object...params){
if(null==params||params.length<1){
System.err.println("没有要销毁的对象或要销毁的对象为空");
System.exit(0);
}else{
try{
for(int i=0;i<params.length;i++){
Object obj = params[i] ;
if(obj instanceof ResultSet){
ResultSet rs = (ResultSet)obj ;
if(null!=rs)
rs.close() ;
}else if(obj instanceof Statement){
Statement stmt =(Statement)obj ;
if(null!=stmt)
stmt.close() ;
}else if(obj instanceof Connection){
Connection _conn = (Connection)obj ;
if(null!=_conn)
_conn.close() ;
}else{
System.err.println("params的类型不匹配，只能为Connection,Statement,ResultSet或其子类");
System.exit(0) ;
}
}
}catch(Exception e){
e.printStackTrace() ;
}
}
}
}
Emp.java
package com.founder.oraclepagination.vo;
import java.util.Date;
/**
* 雇员实体类
*
* @author husong
*
*/
public class Emp {
/**
* 雇员编号
*/
private int empno;
/**
* 雇员名称
*/
private String ename;
/**
* 工种
*/
private String job;
/**
* 领导工号
*/
private int mgr;
/**
* 入职日期
*/
private Date hiredate;
/**
* 薪酬
*/
private float sal;
/**
* 奖金
*/
private float comm;
/**
* 部门代码
*/
private int deptno;
public int getEmpno() {
return empno;
}
public void setEmpno(int empno) {
this.empno = empno;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public int getMgr() {
return mgr;
}
public void setMgr(int mgr) {
this.mgr = mgr;
}
public Date getHiredate() {
return hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
public float getSal() {
return sal;
}
public void setSal(float sal) {
this.sal = sal;
}
public float getComm() {
return comm;
}
public void setComm(float comm) {
this.comm = comm;
}
public int getDeptno() {
return deptno;
}
public void setDeptno(int deptno) {
this.deptno = deptno;
}
}
Pagination接口
package com.founder.oraclepagination.pagination;
import java.sql.SQLException;
import java.util.List;
/**
* 分页接口
* @author husong
*
*/
public interface Pagination {
/**
* 获取总记录数
* @return 获取到的总记录数
* @throws SQLException
*/
int getRowCount() throws SQLException;
/**
* 获取总页数
* @return 获取到的总页数
*/
int getPageCount() ;
/**
* 依据当前页号取得相应的数据
* @param 当前页号
* @return 当前页号取得相应的数据
* @throws SQLException
*/
List<Object> getPage(int pageNum) throws SQLException;
}
分页具体实现
package com.founder.oraclepagination.pagination.impl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.founder.oraclepagination.dbc.DatabaseConnection;
import com.founder.oraclepagination.pagination.Pagination;
import com.founder.oraclepagination.vo.Emp;
/**
* 雇员信息分页实现类
* @author husong
*
*/
public class EmpPaginationImpl implements Pagination {
private DatabaseConnection dbc = null ;
private int pageSize = 5 ;
public EmpPaginationImpl(){
this.dbc = new DatabaseConnection() ;
}
public void setPageSize(int pageSize){
if(0>=pageSize){
this.pageSize = 5 ;
}else{
this.pageSize = pageSize ;
}
}
public int getPageSize(){
return this.pageSize ;
}
@Override
public int getRowCount() throws SQLException {
int count = 0 ;
Connection conn = null ;
PreparedStatement pstmt = null ;
ResultSet rs = null ;
String sql = "select count(*) as count from emp" ;
try{
conn = dbc.getConnection() ;
pstmt = conn.prepareStatement(sql) ;
rs = pstmt.executeQuery() ;
if(null!=rs&&rs.next())
count = rs.getInt("count") ;
}catch(SQLException e){
throw e ;
}finally{
dbc.destroy(rs,pstmt,conn) ;
}
return count ;
}
@Override
public int getPageCount() {
int rowCount = 0 ;
try {
rowCount = getRowCount();
} catch (SQLException e) {
e.printStackTrace();
}
return (rowCount%pageSize==0)?(rowCount/pageSize):(rowCount/pageSize+1) ;
}
@Override
public List<Object> getPage(int pageNum) throws SQLException {
List<Object> list = null ;
String sql = "select * from (select a.*,rownum rn from (select * from emp)a where Rownum<=?) where rn>?" ;
Connection conn = null ;
PreparedStatement pstmt = null ;
ResultSet rs = null ;
try{
if(0>=pageNum){
pageNum = 1 ;
}else if(pageNum>=getPageCount()){
pageNum = getPageCount() ;
}
conn = dbc.getConnection() ;
pstmt = conn.prepareStatement(sql) ;
pstmt.setInt(1, pageSize*pageNum) ;
pstmt.setInt(2, pageSize*(pageNum-1)) ;
rs = pstmt.executeQuery() ;
list = new ArrayList<Object>() ;
/*System.out.println(pageSize*(pageNum));
System.out.println(pageSize*(pageNum-1));
System.out.println(sql);*/
if(null!=rs){
while(rs.next()){
Emp emp = new Emp() ;
emp.setEmpno(rs.getInt("empno")) ;
emp.setEname(rs.getString("ename"));
emp.setJob(rs.getString("job"));
emp.setMgr(rs.getInt("mgr"));
emp.setSal(rs.getFloat("sal"));
emp.setComm(rs.getFloat("comm")) ;
emp.setHiredate(rs.getDate("hiredate")) ;
emp.setDeptno(rs.getInt("deptno")) ;
list.add(emp);
}
}
}catch(SQLException e){
throw e ;
}finally{
dbc.destroy(rs,pstmt,conn) ;
}
return list ;
}
}
测试页
<%@ page language="java" contentType="text/html; charset=gbk"
pageEncoding="gbk"%>
<%@ page import="com.founder.oraclepagination.vo.*,com.founder.oraclepagination.pagination.*,com.founder.oraclepagination.pagination.impl.*,java.util.*" %>
<%
String pageNumStr = request.getParameter("pageNum") ;
int pageNum =1 ;
List<Object> list = null ;
Pagination pagination =new EmpPaginationImpl() ;
if(null==pageNumStr){
pageNumStr ="1" ;
}
try{
//pageNumStr = request.getParameter("pageNum") ;
pageNum = Integer.parseInt(pageNumStr) ;
if(0>=pageNum){
pageNum=1 ;
}else if(pageNum>=pagination.getPageCount()){
pageNum= pagination.getPageCount() ;
}
}catch(Exception e){
pageNum =1 ;
//e.printStackTrace() ;
}
list = pagination.getPage(pageNum) ;
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<link rel="stylesheet" href="css/main.css" type="text/css"/>
<title>Employee detail</title>
</head>
<body>
<div id="container">
<table>
<tr>
<th>雇员编号</th>
<th>雇员名称</th>
<th>工种</th>
<th>主管编号</th>
<th>部门代码</th>
<th>入职日期</th>
<th>薪酬</th>
<th>佣金</th>
</tr>
<%
if(null!=list){
for(Object obj:list){
Emp emp = null ;
if(obj instanceof Emp){
emp = (Emp)obj ;
}
%>
<tr>
<td><%=emp.getEmpno() %></td>
<td><%=emp.getEname() %></td>
<td><%=emp.getJob() %></td>
<td><%=emp.getMgr() %></td>
<td><%=emp.getDeptno() %></td>
<td><%=emp.getHiredate() %></td>
<td><%=emp.getSal() %></td>
<td><%=emp.getComm() %></td>
</tr>
<%
}
}
%>
</table>
<p>
总记录数为<%=pagination.getRowCount() %>，共<%=pagination.getPageCount() %>页，当前第<%=pageNum %>页
<%
if(1==pageNum){
%>
<a href="index.jsp?pageNum=<%=pageNum+1 %>">下一页</a>
<%
}else if(pageNum==pagination.getPageCount()){
%>
<a href="index.jsp?pageNum=<%= pageNum-1 %>">上一页</a>
<%
}else{
%>
<a href="index.jsp?pageNum=<%=pageNum+1 %>">下一页</a>
<a href="index.jsp?pageNum=<%= pageNum-1 %>">上一页</a>
<%
}
%>
</p>
</div>
</body>
</html>
本人是初学者，各位有好的意见，请多多指教！谢谢！