/*****************************************************************************
* Created on 2005-3-25 *
* This file is part of the tna framework distribution. *
* Documentation and updates may be get from biaoping.yin the author of *
* this framework *
* *
* Sun Public License Notice: *
* *
* The contents of this file are subject to the Sun Public License Version *
* 1.0 (the "License"); you may not use this file except in compliance with *
* the License. A copy of the License is available at http://www.sun.com *
* *
* The Original Code is tag. The Initial Developer of the Original *
* Code is biaoping yin. Portions created by biaoping yin are Copyright *
* (C) 2000. All Rights Reserved. *
* *
* GNU Public License Notice: *
* *
* Alternatively, the contents of this file may be used under the terms of *
* the GNU Lesser General Public License (the "LGPL"), in which case the *
* provisions of LGPL are applicable instead of those above. If you wish to *
* allow use of your version of this file only under the terms of the LGPL *
* and not to allow others to use your version of this file under the SPL, *
* indicate your decision by deleting the provisions above and replace *
* them with the notice and other provisions required by the LGPL. If you *
* do not delete the provisions above, a recipient may use your version of *
* this file under either the SPL or the LGPL. *
* *
* biaoping.yin (yin-bp@163.com) *
* *
*****************************************************************************/
package com.frameworkset.common.tag.pager;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Hashtable;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import com.frameworkset.common.poolman.DBUtil;
import com.frameworkset.common.poolman.PreparedDBUtil;
import com.frameworkset.common.poolman.Record;
import com.frameworkset.common.poolman.SQLParams;
import com.frameworkset.util.ListInfo;
/**
* 提供DataInfo接口的缺省实现，从数据库中获取数据集
* @author biaoping.yin
* created on 2005-3-25
* version 1.0
*/
public class DefaultDataInfoImpl implements DataInfo {
/**封装页面数据变量*/
private ListInfo listInfo = null;
private int pageItemsize;
private long offSet;
protected HttpServletRequest request = null;
protected HttpSession session = null;
protected String sql = null;
protected String dbName = null;
protected boolean listMode;
protected boolean first = true;
private static final Logger log = Logger.getLogger(DefaultDataInfoImpl.class);
/**
* 标识查询是否是more查询
*/
private boolean moreQuery;
/**
* 预编译处理参数
*/
private SQLParams params;
/**
* 无需实现
* @param sortKey
* @param desc
* @param offSet
* @param pageItemsize
* @param listMode
* @param request
*/
public void initial(String sortKey, boolean desc, long offSet,
int pageItemsize, boolean listMode,HttpServletRequest request) {
}
/**
* 初始化获取分页/列表数据的必要参数
* @param sql 数据库查询语句
* @param dbName 数据库连接池名称
* @param offSet 获取分页数据时，用该参数设置获取数据的起点
* @param pageItemsize 获取分页数据时，用该参数设置获取数据的条数
*/
public void initial(String sql,
String dbName,
long offSet,
int pageItemsize,
boolean listMode,
// String sortKey,
// boolean desc,
HttpServletRequest request) {
initial( sql,
dbName,
offSet,
pageItemsize,
listMode,
// String sortKey,
// boolean desc,
request,(SQLParams)null);
}
/**
* 初始化获取分页/列表数据的必要参数
* @param sql 数据库查询语句
* @param dbName 数据库连接池名称
* @param offSet 获取分页数据时，用该参数设置获取数据的起点
* @param pageItemsize 获取分页数据时，用该参数设置获取数据的条数
*/
public void initial(String sql,
String dbName,
long offSet,
int pageItemsize,
boolean listMode,
// String sortKey,
// boolean desc,
HttpServletRequest request,SQLParams params) {
this.sql = sql;
this.dbName = dbName;
this.offSet = offSet;
this.pageItemsize =pageItemsize;
this.request = request;
this.params = params;
if(request != null)
session = request.getSession(false);
this.listMode = listMode;
listInfo = null;
first = true;
}
/**
* 从数据库中获取分页页面数据
* @see com.frameworkset.common.tag.pager.DataInfo#getPageItemsFromDB()
*/
public Object[] getPageItemsFromDB() {
if(first)
{
listInfo = getDataFromDB(sql,dbName,offSet,pageItemsize);
first = false;
}
if(listInfo == null)
return null;
return listInfo.getArrayDatas();
}
/**
* 从数据库中获取列表数据
* @see com.frameworkset.common.tag.pager.DataInfo#getListItemsFromDB()
*/
public Object[] getListItemsFromDB() {
if(first)
{
listInfo = getListItemsFromDB(sql,dbName);
first = false;
}
if(listInfo == null)
return null;
return listInfo.getArrayDatas();
}
/**
* 获取数据封装类的Class句柄
*/
public Class getVOClass() {
return Hashtable.class;
}
/* (non-Javadoc)
* @see com.frameworkset.common.tag.pager.DataInfo#getItemCount()
*/
public long getItemCount() {
if(first)
{
if(!listMode)
listInfo = getDataFromDB(sql,dbName,offSet,pageItemsize);
else
listInfo = getListItemsFromDB(sql,dbName);
first = false;
}
if(listInfo == null)
return 0;
return listInfo.getTotalSize();
}
public int getDataResultSize()
{
if(first)
{
if(!listMode)
listInfo = getDataFromDB(sql,dbName,offSet,pageItemsize);
else
listInfo = getListItemsFromDB(sql,dbName);
first = false;
}
if(listInfo == null)
return 0;
return listInfo.getResultSize();
}
/**
* 分页显示时从数据库获取每页的数据项，完成实际访问数据库的操作
* sql:查询语句
* dbName:数据库连接池的名称
* desc:排序的秩序，true为降序，false为升序
* @param offSet - 从数据源获取数据的游标位置
*
* @param pageItemsize - 每页显示的数据条数
* @return ListInfo
*/
protected ListInfo getDataFromDB(String sql,
String dbName,
long offSet,
int pageItemsize)
{
//定义数据库访问对象
try {
ListInfo listInfo = new ListInfo();
if(this.params == null)
{
DBUtil dbUtil = new DBUtil();
HashMap[] tables = (HashMap[])dbUtil.executeSelectForObjectArray(dbName,sql,offSet,pageItemsize,Record.class);
listInfo.setArrayDatas(tables);
listInfo.setTotalSize(dbUtil.getLongTotalSize());
listInfo.setResultSize(dbUtil.size());
return listInfo;
}
else
{
PreparedDBUtil dbUtil = new PreparedDBUtil();
dbUtil.preparedSelect(params.copy(), dbName, sql, offSet, pageItemsize);
HashMap[] tables = (HashMap[])dbUtil.executePreparedForObjectArray(Record.class);
listInfo.setArrayDatas(tables);
listInfo.setTotalSize(dbUtil.getLongTotalSize());
listInfo.setResultSize(dbUtil.size());
return listInfo;
}
} catch (SQLException e) {
log.error(e);
return null;
}
}
/**
* 完成从数据库获取列表显示数据的实际操作
*/
public ListInfo getListItemsFromDB(String sql,
String dbName)
{
try {
ListInfo listInfo = new ListInfo();
if(this.params == null)
{
//定义数据库访问对象
DBUtil dbUtil = new DBUtil();
HashMap[] tables = (HashMap[])dbUtil.executeSelectForObjectArray(dbName,sql,Record.class);
listInfo.setArrayDatas(tables);
listInfo.setResultSize(dbUtil.size());
return listInfo;
}
else
{
//定义数据库访问对象
PreparedDBUtil dbUtil = new PreparedDBUtil();
dbUtil.setMore(this.moreQuery);
dbUtil.preparedSelect(params.copy(), dbName, sql);
HashMap[] tables = (HashMap[])dbUtil.executePreparedForObjectArray(Record.class);
listInfo.setArrayDatas(tables);
listInfo.setMore(this.moreQuery);
listInfo.setResultSize(dbUtil.size());
return listInfo;
}
} catch (SQLException e) {
log.error(e);
return null;
}
}
/**
* 未实现
* @see com.frameworkset.common.tag.pager.DataInfo#getPageItems()
*/
public Object getPageItems() {
return null;
}
/**
* 未实现
*/
public Object getListItems() {
return null;
}
/* (non-Javadoc)
* @see com.frameworkset.common.tag.pager.DataInfo#getDataSize()
*/
public int getDataSize() {
if(first)
{
if(!listMode)
listInfo = getDataFromDB(sql,dbName,offSet,pageItemsize);
else
listInfo = getListItemsFromDB(sql,dbName);
first = false;
}
return listInfo == null
|| listInfo.getArrayDatas() == null
?0:listInfo.getArrayDatas().length;
}
public Object getObjectData() {
throw new UnsupportedOperationException("getObjectData()");
}
public boolean isMoreQuery() {
return moreQuery;
}
public void setMoreQuery(boolean moreQuery) {
this.moreQuery = moreQuery;
}
@Override
public boolean isMore() {
if(first)
{
if(!listMode)
listInfo = getDataFromDB(sql,dbName,offSet,pageItemsize);
else
listInfo = getListItemsFromDB(sql,dbName);
first = false;
}
if(listInfo == null)
return moreQuery;
return listInfo.isMore();
}
}