数据访问查询实例 租房子
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<body>
<h2>租赁信息</h2><br />
<div>
<form action="zufang.php" method="post">
<div>区 域：
<input type="checkbox" onclick="CheckAll(this,\'qy\')" />全选</div>
<?php
require_once "DBDB.class.php";
$db = new DBDB();
$sqlqy = "select distinct Area from house";
$attrqy = $db->Query($sqlqy);
//var_dump($attrqy);
foreach($attrqy as $v)
{
echo "<input class=\'qy\' type=\'checkbox\' value=\'{$v[0]}\' name=\'qy[]\'/>{$v[0]} ";
}
?>
<div><br />租赁类型：<input type="checkbox" onclick="CheckAll(this,\'zl\')"/>全选</div>
<div>
<?php
$sqlzl = "select distinct RentType from House";
$attrzl = $db->Query($sqlzl);
foreach($attrzl as $v)
{
echo "<input class=\'zl\' type=\'checkbox\' value=\'{$v[0]}\' name=\'zl[]\'/>{$v[0]} ";
}
?>
</div><br />
<div>房屋类型：<input type="checkbox" onclick="CheckAll(this,\'fw\')" />全选</div>
<div>
<?php
$sqlfw = "select distinct HouseType from House";
$attrfw = $db->Query($sqlfw);
//var_dump($attrqy);
foreach($attrfw as $v)
{
echo "<input class=\'fw\' type=\'checkbox\' value=\'{$v[0]}\' name=\'fw[]\'/>{$v[0]} ";
}
?>
</div><br />
<div >关 键 字：
<input type="text" name="keyword" id="key" />
<br />
<input type="submit" value="搜索" />
</form>
<br />
<br />
<br />
<table border="2" width="80%" style="text-align:center;" >
<tr>
<td>关键字</td>
<td>区域</td>
<td>面积</td>
<td>租金</td>
<td>租赁类型</td>
<td>房屋类型</td>
</tr>
<?php
$tj = "";
$tj1 = " 1=1 ";//条件恒成立注意空格
$tj2 = " 1=1 ";
$tj3 = " 1=1 ";
$tj4 = " 1=1 ";
if(!empty($_POST["qy"]))
{
// area in (\'\',\'\',\'\',\'\')
$attr = $_POST["qy"];
$str = implode("\',\'",$attr);//拼接字符串
$tj1 = " Area in (\'{$str}\')";
}
if(!empty($_POST["zl"]))
{
$attr = $_POST["zl"];
$str = implode("\',\'",$attr);
$tj2 = " RentType in (\'{$str}\')";
}
if(!empty($_POST["fw"]))
{
$attr = $_POST["fw"];
$str = implode("\',\'",$attr);
$tj3 = " HouseType in (\'{$str}\')";
}
if(!empty($_POST["keyword"]))
{
$attr = $_POST["keyword"];
$tj3 = " keyword like \'%{$attr}%\'";
}
$tj = " Where {$tj1} and {$tj2} and {$tj3} and {$tj4}";//Where 前加空格
$sql = "select * from House".$tj;//拼接
$attrall = $db->Query($sql);
//var_dump($attrall);
foreach($attrall as $v)
{
echo "<tr>
<td>{$v[1]}</td>
<td>{$v[2]}</td>
<td>{$v[3]}</td>
<td>{$v[4]}</td>
<td>{$v[5]}</td>
<td>{$v[6]}</td>
</tr>";
}
?>
</table>
</div>
<script type="text/javascript">
function CheckAll(a,b)//this表示该
{
var qx = a.checked;
var ck = document.getElementsByClassName(b);
for(var i =0;i<ck.length;i++)
{
ck[i].checked = qx;
}
}
</script>
</body>
保持选中查询后条件还是在选中状态
<body>
<h2>租赁信息</h2><br />
<div>
<form action="zufang.php" method="post">
<div>区 域：
<input type="checkbox" onclick="CheckAll(this,\'qy\')" />全选</div>
<?php
require_once "DBDB.class.php";
$db = new DBDB();
$tj = "";
$tj1 = "1=1";
$tj2 = "1=1";
$tj3 = "1=1";
$tj4 = "1=1";
$attr1 = array();
if(!empty($_POST["qy"]))
{
$attr1 = $_POST["qy"];
$str = implode("\',\'",$attr1);
$tj1 = " Area in (\'{$str}\')";
}
$attr2 = array();
if(!empty($_POST["zl"]))
{
$attr2 = $_POST["zl"];
$str = implode("\',\'",$attr2);
$tj2 = " RentType in (\'{$str}\')";
}
$attr3 = array();
if(!empty($_POST["fw"]))
{
$attr3 = $_POST["fw"];
$str = implode("\',\'",$attr3);
$tj3 = " HouseType in (\'{$str}\')";
}
$attr4 = "";
if(!empty($_POST["keyword"]))
{
$attr4 = $_POST["keyword"];
$tj3 = " keyword like \'%{$attr4}%\'";
}
//把if语句拿到上面 拿到复选框的上面，把每个attr拿到花括号外面
$sqlqy = "select distinct Area from house";
$attrqy = $db->Query($sqlqy);
//var_dump($attrqy);
foreach($attrqy as $v)//加if语句
{
if(in_array($v[0],$attr1)){
//判断$v[0] 是否在数组attr1中 遍历出的$v[0]是否被选中
echo "<input class=\'qy\' type=\'checkbox\' checked=\'checked\' value=\'{$v[0]}\' name=\'qy[]\'/>{$v[0]} ";
}else{
echo "<input class=\'qy\' type=\'checkbox\' value=\'{$v[0]}\' name=\'qy[]\'/>{$v[0]} ";
}
}
?>
<div><br />租赁类型：<input type="checkbox" onclick="CheckAll(this,\'zl\')"/>全选</div>
<div>
<?php
$sqlzl = "select distinct RentType from House";
$attrzl = $db->Query($sqlzl);
foreach($attrzl as $v)
{
if(in_array($v[0],$attr2)){
echo "<input class=\'zl\' type=\'checkbox\' checked=\'checked\' value=\'{$v[0]}\' name=\'zl[]\'/>{$v[0]} ";
}else{
echo "<input class=\'zl\' type=\'checkbox\' value=\'{$v[0]}\' name=\'zl[]\'/>{$v[0]} ";
}
}
?>
</div><br />
<div>房屋类型：<input type="checkbox" onclick="CheckAll(this,\'fw\')" />全选</div>
<div>
<?php
$sqlfw = "select distinct HouseType from House";
$attrfw = $db->Query($sqlfw);
//var_dump($attrqy);
foreach($attrfw as $v)
{
if(in_array($v[0],$attr3)){
echo "<input class=\'fw\' type=\'checkbox\' checked=\'checked\' value=\'{$v[0]}\' name=\'fw[]\'/>{$v[0]}";
}else{
echo "<input class=\'fw\' type=\'checkbox\' value=\'{$v[0]}\' name=\'fw[]\'/>{$v[0]}";
}
}
?>
</div><br />
<div >关 键 字：
<input type="text" name="keyword" id="key" value=\'<?php echo $attr4; ?>\'/><!--加入一小段php代码-->
<br />
<input type="submit" value="搜索"/>
</form>
<br />
<br />
<br />
<table border="2" width="80%" style="text-align:center;" >
<tr>
<td>关键字</td>
<td>区域</td>
<td>面积</td>
<td>租金</td>
<td>租赁类型</td>
<td>房屋类型</td>
</tr>
<?php
$tj = " Where {$tj1} and {$tj2} and {$tj3} and {$tj4}";//Where 前加空格
$sql = "select * from House".$tj;
$attrall = $db->Query($sql);
//var_dump($attrall);
foreach($attrall as $v)
{
echo "<tr>
<td>{$v[1]}</td>
<td>{$v[2]}</td>
<td>{$v[3]}</td>
<td>{$v[4]}</td>
<td>{$v[5]}</td>
<td>{$v[6]}</td>
</tr>";
}
?>
</table>
</div>
<script type="text/javascript">
function CheckAll(a,b)//this表示该
{
var qx = a.checked;
var ck = document.getElementsByClassName(b);
for(var i =0;i<ck.length;i++)
{
ck[i].checked = qx;
}
}
</script>
</body>
查询完成条件还是选中状态 和第一个不一样 第一个查询后条件就变为空
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