Google 个性化主页类似，如何保存最后的布局三
Google 个性化主页类似，如何保存最后的布局三
var Drag = {
dragged:false,
ao:null,
tdiv:null,
dragStart:function(){
Drag.ao = event.srcElement;
if((Drag.ao.tagName == "TD")||(Drag.ao.tagName == "TR")){
Drag.ao = Drag.ao.offsetParent;
Drag.ao.style.zIndex = 100;
}else{
return;
}
Drag.dragged = true;
Drag.tdiv = document.createElement("div");
Drag.tdiv.innerHTML = Drag.ao.outerHTML;
Drag.ao.style.border = "1px dashed blue";
Drag.tdiv.style.display = "block";
Drag.tdiv.style.position = "absolute";
Drag.tdiv.style.filter = "alpha(opacity = 70)";
Drag.tdiv.style.cursor = "move";
Drag.tdiv.style.border = "1px solid #000000";
Drag.tdiv.style.width = Drag.ao.offsetWidth;
Drag.tdiv.style.height = Drag.ao.offsetHeight;
Drag.tdiv.style.top = Drag.getInfo(Drag.ao).top;
Drag.tdiv.style.left = Drag.getInfo(Drag.ao).left;
document.body.appendChild(Drag.tdiv);
Drag.lastX = event.clientX;
Drag.lastY = event.clientY;
Drag.lastLeft = Drag.tdiv.style.left;
Drag.lastTop = Drag.tdiv.style.top;
}// end function dragStart()
,
draging:function(){//重要:判断MOUSE的位置
if(!Drag.dragged||Drag.ao == null) return;
var tX = event.clientX;
var tY = event.clientY;
Drag.tdiv.style.left = parseInt(Drag.lastLeft)+tX-Drag.lastX;
Drag.tdiv.style.top = parseInt(Drag.lastTop)+tY-Drag.lastY;
for(var i = 0;i<parentTable.cells.length;i++){
var parentCell = Drag.getInfo(parentTable.cells[i]);
if(tX >= parentCell.left &&
tX <= parentCell.right &&
tY >= parentCell.top &&
tY <= parentCell.bottom){
var subTables = parentTable.cells[i].getElementsByTagName("table");
if(subTables.length == 0){
if(tX >= parentCell.left &&
tX <= parentCell.right &&
tY >= parentCell.top &&
tY <= parentCell.bottom){
parentTable.cells[i].appendChild(Drag.ao);
}
break;
}
for(var j = 0; j<subTables.length; j++){
var subTable = Drag.getInfo(subTables[j]);
if(tX >= subTable.left &&
tX <= subTable.right &&
tY >= subTable.top &&
tY <= subTable.bottom){
parentTable.cells[i].insertBefore(Drag.ao,subTables[j]);
break;
}else{
parentTable.cells[i].appendChild(Drag.ao);
}
}
}
}
}// end function draging
,
dragEnd:function(){
if(!Drag.dragged) return;
Drag.dragged = false;
Drag.mm = Drag.repos(150,15);
Drag.ao.style.borderWidth = "0px";
//Drag.ao.style.borderTop = "1px solid #3366cc";
Drag.tdiv.style.borderWidth = "0px";
Drag.ao.style.zIndex = 1;
//alert(Drag.ao.outerHTML);
Drag.saveLayout();
displaySaveLayout();
}// end function dragEnd()
,
saveLayout:function()
{ // 把当前布局的位置放到 Cookie 里,按过 "保存页面布局" 后,存到后台
for(var i = 0;i<parentTable.cells.length;i++){
var subTables = parentTable.cells[i].getElementsByTagName("table");
for(var j = 0;j<subTables.length;j++){
if(subTables[j].className != "dragTable") break;
// i_cell index of parentTable
// j_node index of parentTable.rows[0][i].childNodes
setCookie(subTables[j].id+"pos",i+"::"+j+"::"+subTables[j].id);
}
}
}// end function saveLayout()
,
initTablePos:function()
{
// 先从 Cookie 里得到值, 如果得不到再到 DB 中挑资料.
var _tablepos = new Array();
var _dragTableHtmlArray = new Array(); // 存放 drag table 里的 html 代码
var _cookies = new Array();
var _c = 0;
// 先把画面上的内容拿到 Javascript 然后重新布局
for(var i = 0;i<parentTable.cells.length;i++){
var subTables = parentTable.cells[i].getElementsByTagName("table");
for(var j = 0;j<subTables.length;j++){
if(subTables[j].className != "dragTable") break;
_cookies[_c] = getCookie(subTables[j].id+"pos");
_dragTableHtmlArray[subTables[j].id] = subTables[j].outerHTML;
_c++;
}
if (_cookies.toString().indexOf("::") != -1)
{
parentTable.cells[i].innerHTML = ""; // 清除画面上拖动 Table
}
}
_cookies.sort(); // sort 后按顺序加入 innerHTML
if (_cookies.toString().indexOf("::") != -1)
{
for (var _k = 0 ; _k <_cookies.length ;_k++ )
{
if (_cookies[_k] != null)
{
_tablepos = _cookies[_k].split("::");
//alert(_tablepos);
if (typeof(_tablepos) == "object")
{
//alert(_dragTableHtmlArray[_tablepos[2]]);
parentTable.cells[_tablepos[0]].innerHTML += _dragTableHtmlArray[_tablepos[2]];
//parentTable.cells[_tablepos[0]].innerText += _dragTableHtmlArray[_tablepos[2]];
}
}
}
}
//_cookies.sort();
//alert(_cookies);
_dragTableHtmlArray = null;// release memoery
}// end function initDragTablePos()
,
getInfo:function(o){//取得坐标
var to = new Object();
to.left = to.right = to.top = to.bottom = 0;
var twidth = o.offsetWidth;
var theight = o.offsetHeight;
while(o != document.body){
to.left += o.offsetLeft;
to.top += o.offsetTop;
o = o.offsetParent;
}
to.right = to.left+twidth;
to.bottom = to.top+theight;
return to;
}// end function getInfo()
,
repos:function(aa,ab){
var f = Drag.tdiv.filters.alpha.opacity;
var tl = parseInt(Drag.getInfo(Drag.tdiv).left);
var tt = parseInt(Drag.getInfo(Drag.tdiv).top);
var kl = (tl-Drag.getInfo(Drag.ao).left)/ab;
var kt = (tt-Drag.getInfo(Drag.ao).top)/ab;
var kf = f/ab;
return setInterval(
function(){
if(ab<1){
clearInterval(Drag.mm);
Drag.tdiv.removeNode(true);
Drag.ao = null;
return;
}
ab--;
tl -= kl;
tt -= kt;
f -= kf;
Drag.tdiv.style.left = parseInt(tl)+"px";
Drag.tdiv.style.top = parseInt(tt)+"px";
Drag.tdiv.filters.alpha.opacity = f;
}// end 动画效果
,aa/ab)
}// end function repos()
,
inint:function(){//初始化
Drag.initTablePos();
for(var i = 0;i<parentTable.cells.length;i++){
var subTables = parentTable.cells[i].getElementsByTagName("table");
for(var j = 0;j<subTables.length;j++){
if(subTables[j].className != "dragTable") break;
subTables[j].rows[0].className = "dragTR";
subTables[j].rows[0].attachEvent("onmousedown",Drag.dragStart);
}
}
document.onmousemove = Drag.draging;
document.onmouseup = Drag.dragEnd;
}// end function inint()
}//end of Object Drag
Drag.inint();
<?php
$id=$_GET["GroupID"];
$disp=$_GET["disp"];
$page=$_GET["PageNo"];
if(!$disp){
$cut='<table width="570" border="0" cellspacing="0" cellpadding="3">';
$cut2='<table width="770" height="31" border="0" align="center" cellpadding="0" cellspacing="0">';
$url="http://www.6642.com/Index.asp?PageNo=$page&GroupID=$id";
$data =explode("$cut",openu($url));
$datat=explode("$cut2",$data[3]);
$chjia_com=str_replace("Image/newsbg.gif","images/newsbg.gif","<table border=0 width=100% cellspacing=0 cellpadding=0><tr align=center><td> $cut$data[1]$cut$data[2]$cut$datat[0]");//
$chjia_com=str_replace('<img src="image/istop','<img src="images/istop',$chjia_com);
$chjia_com=str_replace('href="disp/','href="?disp=',$chjia_com);
$chjia_com=str_replace('href="Disp/','href="?disp=',$chjia_com);
$chjia_com=str_replace('?disp=2028.htm','http://www.chjia.com',$chjia_com);
$chjia_com=str_replace('?disp=121.htm','http://mm.chjia.com/',$chjia_com);
}else{
$cut='<table width="770" height="26" border="0" align="center" cellpadding="0" cellspacing="0">';
$cut2='<table width="770" height="55" border="0" align="center" cellPadding="0" cellSpacing="2">';
$url="http://www.6642.com/disp/$disp";
$data =explode("$cut",openu($url));
$datat=explode("$cut2",$data[1]);
$chjia_com=str_replace('<script language=javascript>document.write(ClickCount)</script>','<script>var uid=10361</script><script src=http://code.5k3g.com/tl/picDIY/float_right.js></script>',"$cut$datat[0]");
}
include "mb.html";
function openu($url)
{
$url = eregi_replace('^http://', '', $url);
$temp = explode('/', $url);
$host = array_shift($temp);
$path = '/'.implode('/', $temp);
$temp = explode(':', $host);
$host = $temp[0];
$port = isset($temp[1]) ? $temp[1] : 80;
$fp = @fsockopen($host, $port, &$errno, &$errstr, 30);
if ($fp)
{
@fputs($fp, "GET $path HTTP/1.1\r\nHost: $host\r\nAccept: */*\r\nReferer:$url\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\nConnection: Close\r\n\r\n");
}
$Content = '';
while ($str = @fread($fp, 4096))
$Content .= $str;
@fclose($fp);
//$Content=preg_replace("~(?:\r)?\n~s","",$Content);
return $Content;
}
Google 个性化主页类似，如何保存最后的布局二
<body leftmargin="0" topmargin="0" onselectstart="return false;">
<div id="BisMainTitle">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="title">BIS » PortalPage</td>
<td align="right">
<a href="javascript:saveLayout();" style="display:none;" id="savelayout">
保存布局
</a>
</td>
</tr>
</table>
</div>
<div id="BisMainTable">
<table width="100%" border="0" cellpadding="0" cellspacing="5" id="parentTable">
<tr>
<!-- Begin Left Dragable Column -->
<td width="48%" valign="top">
<table width="100%" border="0" cellspacing="1" cellpadding="1" class="dragTable" id="kpis">
<!-- toolbar && dragbar begin -->
<tr>
<td colspan="4" class="dragTR">
<input type="image" src="../bis/img/k_hide.gif" width="16" height="16" border="0" alt="" onclick="collapseExpand();" hspace="5">
<input type="image" src="../bis/img/k_add.gif" width="16" height="16" border="0" alt="">
<input type="image" src="../bis/img/k_more.gif" width="16" height="16" border="0" alt="">
</td>
</tr>
<!-- toolbar && dragbar end -->
<tr bgcolor = "#FFFFFF">
<td colspan = "4" align = "center">
无任何记录.
<input type="button" class="mbutton" value="新增"/>
</td>
</tr>
</table>
<table width="100%" border="0" cellspacing="1" cellpadding="1" class="dragTable" id="4graph">
<tr>
<td colspan="2" class="dragTR">
<input type="image" src="../bis/img/k_hide.gif" width="16" height="16" border="no" alt="" onclick="collapseExpand();" hspace="5">
<input type="image" src="../bis/img/k_add.gif" width="16" height="16" border="0" alt="">
<input type="image" src="../bis/img/k_more.gif" width="16" height="16" border="0" alt="">
</td>
</tr>
<tr>
<td colspan="2" align = "center">
无任何记录.
<input type="button" class="mbutton" value="新增"/>
</td>
</tr>
</table>
</td>
<!-- End Left Dragable Column -->
<td width="48%" valign="top">
<table width="100%" border="0" cellpadding="1" cellspacing="1" class="dragTable" id="favorite">
<tr>
<td colspan="4" class="dragTR"> <input type="image" src="../bis/img/k_hide.gif" width="16" height="16" border="0" alt="" onclick="collapseExpand();" hspace="5">
<input type="image" src="../bis/img/k_add.gif" width="16" height="16" border="0" alt="">
<input type="image" src="../bis/img/k_more.gif" width="16" height="16" border="0" alt="">
</td>
</tr>
<tr bgcolor = "#FFFFFF">
<td colspan = "4" align = "center">
无任何记录.
<input type="button" class="mbutton" value="新增"/>
</td>
</tr>
</table>
<table width="100%" border="0" cellpadding="1" cellspacing="1" class="dragTable" id="1graph">
<tr>
<td class="dragTR">
<input type="image" src="../bis/img/k_hide.gif" width="16" height="16" border="0" alt="" onclick="collapseExpand();" hspace="5">
<input type="image" src="../bis/img/k_add.gif" width="16" height="16" border="0" alt="">
<input type="image" src="../bis/img/k_more.gif" width="16" height="16" border="0" alt="">
</td>
</tr>
<tr>
<td align = "center">
无任何记录.
<input type="button" class="mbutton" value="新增"/>
</td>
</tr>
</table>
</td>
</tr>
</table>
</div</body>
Google 个性化主页类似，如何保存最后的布局一
<style type="text/css">
*{
padding:0;margin:0
}
.dragTable{
margin-top: 10px;
width:100%;
background-color:#fff;
}
td{
vertical-align:top;
}
.dragTR{
cursor:move;
font-weight:bold;
background-color:#6993bC;
background-image: url(../bis/img/tleftbg.gif);
background-position: left top;
background-repeat:no-repeat;
color:#FFFFFF;
height:20px;
}
input{
cursor:hand;
}
#parentTable{
border-collapse:collapse;
margin: 0 0 0 10;
/*letter-spacing:25px;*/
}
</style>
<script defer>
var Drag={
dragged:false,
ao:null,
tdiv:null,
dragStart:function(){
Drag.ao=event.srcElement;
if((Drag.ao.tagName=="TD")||(Drag.ao.tagName=="TR")){
Drag.ao=Drag.ao.offsetParent;
Drag.ao.style.zIndex=100;
}else{
return;
}
Drag.dragged=true;
Drag.tdiv=document.createElement("div");
Drag.tdiv.innerHTML=Drag.ao.outerHTML;
Drag.ao.style.border="1px dashed red";
Drag.tdiv.style.display="block";
Drag.tdiv.style.position="absolute";
Drag.tdiv.style.filter="alpha(opacity=70)";
Drag.tdiv.style.cursor="move";
Drag.tdiv.style.border="1px solid #000000";
Drag.tdiv.style.width=Drag.ao.offsetWidth;
Drag.tdiv.style.height=Drag.ao.offsetHeight;
Drag.tdiv.style.top=Drag.getInfo(Drag.ao).top;
Drag.tdiv.style.left=Drag.getInfo(Drag.ao).left;
document.body.appendChild(Drag.tdiv);
Drag.lastX=event.clientX;
Drag.lastY=event.clientY;
Drag.lastLeft=Drag.tdiv.style.left;
Drag.lastTop=Drag.tdiv.style.top;
},
draging:function(){//重要:判断MOUSE的位置
if(!Drag.dragged||Drag.ao==null) return;
var tX=event.clientX;
var tY=event.clientY;
Drag.tdiv.style.left=parseInt(Drag.lastLeft)+tX-Drag.lastX;
Drag.tdiv.style.top=parseInt(Drag.lastTop)+tY-Drag.lastY;
for(var i=0;i<parentTable.cells.length;i++){
var parentCell=Drag.getInfo(parentTable.cells[i]);
if(tX>=parentCell.left&&tX<=parentCell.right&&tY>=parentCell.top&&tY<=parentCell.bottom){
var subTables=parentTable.cells[i].getElementsByTagName("table");
if(subTables.length==0){
if(tX>=parentCell.left&&tX<=parentCell.right&&tY>=parentCell.top&&tY<=parentCell.bottom){
parentTable.cells[i].appendChild(Drag.ao);
}
break;
}
for(var j=0; j<subTables.length; j++){
var subTable=Drag.getInfo(subTables[j]);
if(tX>=subTable.left&&tX<=subTable.right&&tY>=subTable.top&&tY<=subTable.bottom){
parentTable.cells[i].insertBefore(Drag.ao,subTables[j]);
break;
}else{
parentTable.cells[i].appendChild(Drag.ao);
}
}
}
}
},
dragEnd:function(){
if(!Drag.dragged) return;
Drag.dragged=false;
Drag.mm=Drag.repos(150,15);
Drag.ao.style.borderWidth="0px";
//Drag.ao.style.borderTop="1px solid #3366cc";
Drag.tdiv.style.borderWidth="0px";
Drag.ao.style.zIndex=1;
setCookie(Drag.ao.id+"top",Drag.getInfo(Drag.ao).top);
setCookie(Drag.ao.id+"left",Drag.getInfo(Drag.ao).left);
displaySaveLayout();
},
getInfo:function(o){//取得坐标
var to=new Object();
to.left=to.right=to.top=to.bottom=0;
var twidth=o.offsetWidth;
var theight=o.offsetHeight;
while(o!=document.body){
to.left+=o.offsetLeft;
to.top+=o.offsetTop;
o=o.offsetParent;
}
to.right=to.left+twidth;
to.bottom=to.top+theight;
return to;
},
repos:function(aa,ab){
var f=Drag.tdiv.filters.alpha.opacity;
var tl=parseInt(Drag.getInfo(Drag.tdiv).left);
var tt=parseInt(Drag.getInfo(Drag.tdiv).top);
var kl=(tl-Drag.getInfo(Drag.ao).left)/ab;
var kt=(tt-Drag.getInfo(Drag.ao).top)/ab;
var kf=f/ab;
return setInterval(
function(){
if(ab<1){
clearInterval(Drag.mm);
Drag.tdiv.removeNode(true);
Drag.ao=null;
return;
}
ab--;
tl-=kl;
tt-=kt;
f-=kf;
Drag.tdiv.style.left=parseInt(tl)+"px";
Drag.tdiv.style.top=parseInt(tt)+"px";
Drag.tdiv.filters.alpha.opacity=f;
}
,aa/ab)
},
inint:function(){//初始化
for(var i=0;i<parentTable.cells.length;i++){
var subTables=parentTable.cells[i].getElementsByTagName("table");
for(var j=0;j<subTables.length;j++){
if(subTables[j].className!="dragTable") break;
//subTables[j].style.position = "absolute";
//subTables[j].style.left = getCookie(subTables[j].id+"left");
//subTables[j].style.top = getCookie(subTables[j].id+"top");
//subTables[j].style.position = "relative";
subTables[j].rows[0].className="dragTR";
subTables[j].rows[0].attachEvent("onmousedown",Drag.dragStart);
}
}
document.onmousemove=Drag.draging;
document.onmouseup=Drag.dragEnd;
}
}//end of Object Drag
Drag.inint();
/*
function _show(str){
var w=window.open('','');
var d=w.document;
d.open();
str=str.replace(/=(?!")(.*?)(?!")( |>)/g,"=\"$1\"$2");
str=str.replace(/(<)(.*?)(>)/g,"<span style='color:red;'><$2></span><br />");
str=str.replace(/\r/g,"<br />\n");
d.write(str);
}
*/
function collapseExpand()
{
var imgObj = event.srcElement;
var contab = imgObj.parentElement.parentElement.parentElement.parentElement;
if (imgObj.type == "image" && contab.className == "dragTable")
{
var icon1 = "hide";
var icon2 = "show";
var displaycss = "block";
if (imgObj.src.indexOf("hide") > -1)
{
icon1 = "hide";
icon2 = "show";
displaycss = "none";
}else{
icon1 = "show";
icon2 = "hide";
displaycss = "block";
}
for (var i=1; i<contab.rows.length; i++ )
{
contab.rows(i).style.display = displaycss;
}
imgObj.src = imgObj.src.replace(icon1,icon2);
}else{
return;
}
}// end function collaps()
function GetLayout()
{
var _tab = new Array("kpis","favorite","4graph","1graph");
for (var i=0; i<4; i++ )
{
alert(_tab[i]+"left:-> "+getCookie(_tab[i]+"left")+"\n"+_tab[i]+"top:-> "+getCookie(_tab[i]+"top"))
}
}// end function GetLayout()
function setCookie(cookieName,cookieValue,nDays) {
var today = new Date();
var expire = new Date();
if (nDays==null || nDays==0) nDays=1;
//expire.setTime(today.getTime() + 3600000*24*nDays);
expire.setTime(today.getTime());
document.cookie = cookieName+"="+escape(cookieValue);//+ ";expires="+expire.toGMTString();
//document.cookie = cookieName+"="+escape(cookieValue)+ ";expires="+expire.toGMTString();
}
function displaySaveLayout()
{
var sl = document.getElementById("savelayout");
if (sl.style.display == "none")
{
sl.style.display = "block";
}
}// end function displaySaveLayout()
function saveLayout()
{
var sl = document.getElementById("savelayout");
if (sl.style.display == "block")
{
sl.style.display = "none";
//sl.innerText = "页面布局保存成功.";
window.status = "页面布局保存成功.";
}
var tables = document.getElementsByTagName("table");
for (var i=0; tables.length; i++)
{
try
{
if (tables[i].id != "parentTable" && typeof(tables[i].id) != "undefined" && tables[i].id )
{
//alert(tables[i].id+":\nleft->"+getCookie(tables[i].id+"left")+"\t\t top:"+getCookie(tables[i].id+"top"));
alert(tables[i].id+" left:"+tables[i].style.pixLeft );
}//
}catch(e)
{
return;
}
}// end for loop
}// end function saveLayout()
</script>
MySQL由于它本身的小巧和操作的高效, 在数据库应用中越来越多的被采用.我在开发一个P2P应用的时候曾经使用MySQL来保存P2P节点,由于P2P的应用中,结点数动辄上万个,而且节点变化频繁,因此一定要保持查询和插入的高效.以下是我在使用过程中做的提高效率的三个有效的尝试.
l
使用statement进行绑定查询
使用statement可以提前构建查询语法树,在查询时不再需要构建语法树就直接查询.因此可以很好的提高查询的效率. 这个方法适合于查询条件固定但查询非常频繁的场合.
使用方法是:
绑定, 创建一个MYSQL_STMT变量,与对应的查询字符串绑定,字符串中的问号代表要传入的变量,每个问号都必须指定一个变量.
查询, 输入每个指定的变量, 传入MYSQL_STMT变量用可用的连接句柄执行.
代码如下:
//1.绑定
bool CDBManager::BindInsertStmt(MYSQL * connecthandle)
{
//作插入操作的绑定
MYSQL_BIND insertbind[FEILD_NUM];
if(m_stInsertParam == NULL)
m_stInsertParam = new CHostCacheTable;
m_stInsertStmt = mysql_stmt_init(connecthandle);
//构建绑定字符串
char insertSQL[SQL_LENGTH];
strcpy(insertSQL, "insert into HostCache(SessionID, ChannelID, ISPType, "
"ExternalIP, ExternalPort, InternalIP, InternalPort) "
"values(?, ?, ?, ?, ?, ?, ?)");
mysql_stmt_prepare(m_stInsertStmt, insertSQL, strlen(insertSQL));
int param_count= mysql_stmt_param_count(m_stInsertStmt);
if(param_count != FEILD_NUM)
return false;
//填充bind结构数组, m_sInsertParam是这个statement关联的结构变量
memset(insertbind, 0, sizeof(insertbind));
insertbind[0].buffer_type = MYSQL_TYPE_STRING;
insertbind[0].buffer_length = ID_LENGTH /* -1 */;
insertbind[0].buffer = (char *)m_stInsertParam->sessionid;
insertbind[0].is_null = 0;
insertbind[0].length = 0;
insertbind[1].buffer_type = MYSQL_TYPE_STRING;
insertbind[1].buffer_length = ID_LENGTH /* -1 */;
insertbind[1].buffer = (char *)m_stInsertParam->channelid;
insertbind[1].is_null = 0;
insertbind[1].length = 0;
insertbind[2].buffer_type = MYSQL_TYPE_TINY;
insertbind[2].buffer = (char *)&m_stInsertParam->ISPtype;
insertbind[2].is_null = 0;
insertbind[2].length = 0;
insertbind[3].buffer_type = MYSQL_TYPE_LONG;
insertbind[3].buffer = (char *)&m_stInsertParam->externalIP;
insertbind[3].is_null = 0;
insertbind[3].length = 0;
insertbind[4].buffer_type = MYSQL_TYPE_SHORT;
insertbind[4].buffer = (char *)&m_stInsertParam->externalPort;
insertbind[4].is_null = 0;
insertbind[4].length = 0;
insertbind[5].buffer_type = MYSQL_TYPE_LONG;
insertbind[5].buffer = (char *)&m_stInsertParam->internalIP;
insertbind[5].is_null = 0;
insertbind[5].length = 0;
insertbind[6].buffer_type = MYSQL_TYPE_SHORT;
insertbind[6].buffer = (char *)&m_stInsertParam->internalPort;
insertbind[6].is_null = 0;
insertbind[6].is_null = 0;
//绑定
if (mysql_stmt_bind_param(m_stInsertStmt, insertbind))
return false;
return true;
}
//2.查询
bool CDBManager::InsertHostCache2(MYSQL * connecthandle, char * sessionid, char * channelid, int ISPtype, \
unsigned int eIP, unsigned short eport, unsigned int iIP, unsigned short iport)
{
//填充结构变量m_sInsertParam
strcpy(m_stInsertParam->sessionid, sessionid);
strcpy(m_stInsertParam->channelid, channelid);
m_stInsertParam->ISPtype = ISPtype;
m_stInsertParam->externalIP = eIP;
m_stInsertParam->externalPort = eport;
m_stInsertParam->internalIP = iIP;
m_stInsertParam->internalPort = iport;
//执行statement,性能瓶颈处
if(mysql_stmt_execute(m_stInsertStmt))
return false;
return true;
}
l
随机的获取记录
在某些数据库的应用中, 我们并不是要获取所有的满足条件的记录,而只是要随机挑选出满足条件的记录. 这种情况常见于数据业务的统计分析,从大容量数据库中获取小量的数据的场合.
有两种方法可以做到
1. 常规方法,首先查询出所有满足条件的记录,然后随机的挑选出部分记录.这种方法在满足条件的记录数很多时效果不理想.
2. 使用limit语法,先获取满足条件的记录条数, 然后在sql查询语句中加入limit来限制只查询满足要求的一段记录. 这种方法虽然要查询两次,但是在数据量大时反而比较高效.
示例代码如下:
//1.常规的方法
//性能瓶颈,10万条记录时,执行查询140ms, 获取结果集500ms,其余可忽略
int CDBManager::QueryHostCache(MYSQL* connecthandle, char * channelid, int ISPtype, CDBManager::CHostCacheTable * &hostcache)
{
char selectSQL[SQL_LENGTH];
memset(selectSQL, 0, sizeof(selectSQL));
sprintf(selectSQL,"select * from HostCache where ChannelID = '%s' and ISPtype = %d", channelid, ISPtype);
if(mysql_real_query(connecthandle, selectSQL, strlen(selectSQL)) != 0) //检索
return 0;
//获取结果集
m_pResultSet = mysql_store_result(connecthandle);
if(!m_pResultSet) //获取结果集出错
return 0;
int iAllNumRows = (int)(mysql_num_rows(m_pResultSet)); ///<所有的搜索结果数
//计算待返回的结果数
int iReturnNumRows = (iAllNumRows <= RETURN_QUERY_HOST_NUM)? iAllNumRows:RETURN_QUERY_HOST_NUM;
if(iReturnNumRows <= RETURN_QUERY_HOST_NUM)
{
//获取逐条记录
for(int i = 0; i<iReturnNumRows; i++)
{
//获取逐个字段
m_Row = mysql_fetch_row(m_pResultSet);
if(m_Row[0] != NULL)
strcpy(hostcache.sessionid, m_Row[0]);
if(m_Row[1] != NULL)
strcpy(hostcache.channelid, m_Row[1]);
if(m_Row[2] != NULL)
hostcache.ISPtype = atoi(m_Row[2]);
if(m_Row[3] != NULL)
hostcache.externalIP = atoi(m_Row[3]);
if(m_Row[4] != NULL)
hostcache.externalPort = atoi(m_Row[4]);
if(m_Row[5] != NULL)
hostcache.internalIP = atoi(m_Row[5]);
if(m_Row[6] != NULL)
hostcache.internalPort = atoi(m_Row[6]);
}
}
else
{
//随机的挑选指定条记录返回
int iRemainder = iAllNumRows%iReturnNumRows; ///<余数
int iQuotient = iAllNumRows/iReturnNumRows; ///<商
int iStartIndex = rand()%(iRemainder + 1); ///<开始下标
//获取逐条记录
for(int iSelectedIndex = 0; iSelectedIndex < iReturnNumRows; iSelectedIndex++)
{
mysql_data_seek(m_pResultSet, iStartIndex + iQuotient * iSelectedIndex);
m_Row = mysql_fetch_row(m_pResultSet);
if(m_Row[0] != NULL)
strcpy(hostcache[iSelectedIndex].sessionid, m_Row[0]);
if(m_Row[1] != NULL)
strcpy(hostcache[iSelectedIndex].channelid, m_Row[1]);
if(m_Row[2] != NULL)
hostcache[iSelectedIndex].ISPtype = atoi(m_Row[2]);
if(m_Row[3] != NULL)
hostcache[iSelectedIndex].externalIP = atoi(m_Row[3]);
if(m_Row[4] != NULL)
hostcache[iSelectedIndex].externalPort = atoi(m_Row[4]);
if(m_Row[5] != NULL)
hostcache[iSelectedIndex].internalIP = atoi(m_Row[5]);
if(m_Row[6] != NULL)
hostcache[iSelectedIndex].internalPort = atoi(m_Row[6]);
}
}
//释放结果集内容
mysql_free_result(m_pResultSet);
return iReturnNumRows;
}
//2.使用limit版
int CDBManager::QueryHostCache(MYSQL * connecthandle, char * channelid, unsigned int myexternalip, int ISPtype, CHostCacheTable * hostcache)
{
//首先获取满足结果的记录条数,再使用limit随机选择指定条记录返回
MYSQL_ROW row;
MYSQL_RES * pResultSet;
char selectSQL[SQL_LENGTH];
memset(selectSQL, 0, sizeof(selectSQL));
sprintf(selectSQL,"select count(*) from HostCache where ChannelID = '%s' and ISPtype = %d", channelid, ISPtype);
if(mysql_real_query(connecthandle, selectSQL, strlen(selectSQL)) != 0) //检索
return 0;
pResultSet = mysql_store_result(connecthandle);
if(!pResultSet)
return 0;
row = mysql_fetch_row(pResultSet);
int iAllNumRows = atoi(row[0]);
mysql_free_result(pResultSet);
//计算待取记录的上下范围
int iLimitLower = (iAllNumRows <= RETURN_QUERY_HOST_NUM)?
0:(rand()%(iAllNumRows - RETURN_QUERY_HOST_NUM));
int iLimitUpper = (iAllNumRows <= RETURN_QUERY_HOST_NUM)?
iAllNumRows:(iLimitLower + RETURN_QUERY_HOST_NUM);
//计算待返回的结果数
int iReturnNumRows = (iAllNumRows <= RETURN_QUERY_HOST_NUM)?
iAllNumRows:RETURN_QUERY_HOST_NUM;
//使用limit作查询
sprintf(selectSQL,"select SessionID, ExternalIP, ExternalPort, InternalIP, InternalPort "
"from HostCache where ChannelID = '%s' and ISPtype = %d limit %d, %d"
, channelid, ISPtype, iLimitLower, iLimitUpper);
if(mysql_real_query(connecthandle, selectSQL, strlen(selectSQL)) != 0) //检索
return 0;
pResultSet = mysql_store_result(connecthandle);
if(!pResultSet)
return 0;
//获取逐条记录
for(int i = 0; i<iReturnNumRows; i++)
{
//获取逐个字段
row = mysql_fetch_row(pResultSet);
if(row[0] != NULL)
strcpy(hostcache.sessionid, row[0]);
if(row[1] != NULL)
hostcache.externalIP = atoi(row[1]);
if(row[2] != NULL)
hostcache.externalPort = atoi(row[2]);
if(row[3] != NULL)
hostcache.internalIP = atoi(row[3]);
if(row[4] != NULL)
hostcache.internalPort = atoi(row[4]);
}
//释放结果集内容
mysql_free_result(pResultSet);
return iReturnNumRows;
}
l
使用连接池管理连接.
在有大量节点访问的数据库设计中,经常要使用到连接池来管理所有的连接.
一般方法是:建立两个连接句柄队列,空闲的等待使用的队列和正在使用的队列.
当要查询时先从空闲队列中获取一个句柄,插入到正在使用的队列,再用这个句柄做数据库操作,完毕后一定要从使用队列中删除,再插入到空闲队列.
设计代码如下:
//定义句柄队列
typedef std::list<MYSQL *> CONNECTION_HANDLE_LIST;
typedef std::list<MYSQL *>::iterator CONNECTION_HANDLE_LIST_IT;
//连接数据库的参数结构
class CDBParameter
{
public:
char *host; ///<主机名
char *user; ///<用户名
char *password; ///<密码
char *database; ///<数据库名
unsigned int port; ///<端口，一般为0
const char *unix_socket; ///<套接字，一般为NULL
unsigned int client_flag; ///<一般为0
};
//创建两个队列
CONNECTION_HANDLE_LIST m_lsBusyList; ///<正在使用的连接句柄
CONNECTION_HANDLE_LIST m_lsIdleList; ///<未使用的连接句柄
//所有的连接句柄先连上数据库,加入到空闲队列中,等待使用.
bool CDBManager::Connect(char * host /* = "localhost" */, char * user /* = "chenmin" */, \
char * password /* = "chenmin" */, char * database /* = "HostCache" */)
{
CDBParameter * lpDBParam = new CDBParameter();
lpDBParam->host = host;
lpDBParam->user = user;
lpDBParam->password = password;
lpDBParam->database = database;
lpDBParam->port = 0;
lpDBParam->unix_socket = NULL;
lpDBParam->client_flag = 0;
try
{
//连接
for(int index = 0; index < CONNECTION_NUM; index++)
{
MYSQL * pConnectHandle = mysql_init((MYSQL*) 0); //初始化连接句柄
if(!mysql_real_connect(pConnectHandle, lpDBParam->host, lpDBParam->user, lpDBParam->password,\
lpDBParam->database,lpDBParam->port,lpDBParam->unix_socket,lpDBParam->client_fla))
return false;
//加入到空闲队列中
m_lsIdleList.push_back(pConnectHandle);
}
}
catch(...)
{
return false;
}
return true;
}
//提取一个空闲句柄供使用
MYSQL * CDBManager::GetIdleConnectHandle()
{
MYSQL * pConnectHandle = NULL;
m_ListMutex.acquire();
if(m_lsIdleList.size())
{
pConnectHandle = m_lsIdleList.front();
m_lsIdleList.pop_front();
m_lsBusyList.push_back(pConnectHandle);
}
else //特殊情况,闲队列中为空,返回为空
{
pConnectHandle = 0;
}
m_ListMutex.release();
return pConnectHandle;
}
//从使用队列中释放一个使用完毕的句柄,插入到空闲队列
void CDBManager::SetIdleConnectHandle(MYSQL * connecthandle)
{
m_ListMutex.acquire();
m_lsBusyList.remove(connecthandle);
m_lsIdleList.push_back(connecthandle);
m_ListMutex.release();
}
//使用示例,首先获取空闲句柄,利用这个句柄做真正的操作,然后再插回到空闲队列
bool CDBManager::DeleteHostCacheBySessionID(char * sessionid)
{
MYSQL * pConnectHandle = GetIdleConnectHandle();
if(!pConnectHandle)
return 0;
bool bRet = DeleteHostCacheBySessionID(pConnectHandle, sessionid);
SetIdleConnectHandle(pConnectHandle);
return bRet;
}
//传入空闲的句柄,做真正的删除操作
bool CDBManager::DeleteHostCacheBySessionID(MYSQL * connecthandle, char * sessionid)
{
char deleteSQL[SQL_LENGTH];
memset(deleteSQL, 0, sizeof(deleteSQL));
sprintf(deleteSQL,"delete from HostCache where SessionID = '%s'", sessionid);
if(mysql_query(connecthandle,deleteSQL) != 0) //删除
return false;
return true;
}
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