php搜索帮助
以下是我从搜索表单中发布的变量:php搜索帮助,php,mysql,Php,Mysql,以下是我从搜索表单中发布的变量: $city = $_REQUEST['city']; $location = $_REQUEST['location']; $bedrooms = $_REQUEST['noofbedrooms']; $addeddate = $_REQUEST['addeddate']; $minprice = $_REQUEST['pricefrom']; $maxprice = $_REQUEST['priceto']; $minarea = $_REQUEST['are
$city = $_REQUEST['city'];
$location = $_REQUEST['location'];
$bedrooms = $_REQUEST['noofbedrooms'];
$addeddate = $_REQUEST['addeddate'];
$minprice = $_REQUEST['pricefrom'];
$maxprice = $_REQUEST['priceto'];
$minarea = $_REQUEST['areafrom'];
$maxarea = $_REQUEST['areato'];
$propertytype = $_REQUEST['proptype'];
到目前为止还不错。现在,我需要一些关于以下场景的好建议。
我的领域中几乎每个元素都是可选的。这意味着我可以在上面的变量中得到空值
为上述变量创建mysql查询的场景应该是什么。在这种情况下,我可以为每个场景使用条件。乙二醇
if($city=="")
$query="";
elseif($location=="")
$query="";
and so on....
我需要一些专业的方法来解决这个问题。你可以这样做
$where = array();
if(strcmp($_REQUEST['city'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['city'] . "'";
}
if(strcmp($_REQUEST['location'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['location'] . "'";
}
if(strcmp($_REQUEST['noofbedrooms'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['noofbedrooms'] . "'";
}
if(strcmp($_REQUEST['addeddate'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['addeddate'] . "'";
}
if(strcmp($_REQUEST['pricefrom'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['pricefrom'] . "'";
}
...... // check for all the fields
when create the SQL using
$SQL = implode(" OR ", $where);
之后,您可以在一些SQL上使用它,比如
"SELECT * FROM WHERE {$SQL}";
你可以这样做
$where = array();
if(strcmp($_REQUEST['city'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['city'] . "'";
}
if(strcmp($_REQUEST['location'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['location'] . "'";
}
if(strcmp($_REQUEST['noofbedrooms'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['noofbedrooms'] . "'";
}
if(strcmp($_REQUEST['addeddate'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['addeddate'] . "'";
}
if(strcmp($_REQUEST['pricefrom'], "")){
$where[] = "SEARCH_COLUMN = '" . $_REQUEST['pricefrom'] . "'";
}
...... // check for all the fields
when create the SQL using
$SQL = implode(" OR ", $where);
之后,您可以在一些SQL上使用它,比如
"SELECT * FROM WHERE {$SQL}";
如果所有查询部分都以相同的方式构建:WHERE fieldname='fieldvalue',则可以使用一种基于循环的惰性方法:
$conditions = array();
foreach (array("city", "location", "noofbedrooms") as $field)
// ^ add all fields as needed
{
// Check whether parameter was passed at all
if (!array_key_exists($field, $_POST)) continue;
// Check whether parameter is empty
if (!empty($_POST[$field]))
$conditions[]="`$field` = ".mysql_real_escape_string($_POST[$field]);
// ^ or whatever your database library
// does for escaping
}
$query = "SELECT * from table where ".implode(" AND ", $conditions);
如果所有查询部分都以相同的方式构建:WHERE fieldname='fieldvalue',则可以使用一种基于循环的惰性方法:
$conditions = array();
foreach (array("city", "location", "noofbedrooms") as $field)
// ^ add all fields as needed
{
// Check whether parameter was passed at all
if (!array_key_exists($field, $_POST)) continue;
// Check whether parameter is empty
if (!empty($_POST[$field]))
$conditions[]="`$field` = ".mysql_real_escape_string($_POST[$field]);
// ^ or whatever your database library
// does for escaping
}
$query = "SELECT * from table where ".implode(" AND ", $conditions);
这样做应该可以:
$fields = array('city', 'location' /* ... */);
$conditions = array();
foreach ($fields as $field) {
if (!empty($_REQUEST[$field])) {
$conditions[] = 'column LIKE "%'.mysql_real_escape_string($_REQUEST[$field]).'%"';
}
}
$query = 'SELECT row FROM table WHERE '.implode(' OR ', $conditions);
您需要调整此选项以满足您的需要,例如。类似的操作应该可以:
$fields = array('city', 'location' /* ... */);
$conditions = array();
foreach ($fields as $field) {
if (!empty($_REQUEST[$field])) {
$conditions[] = 'column LIKE "%'.mysql_real_escape_string($_REQUEST[$field]).'%"';
}
}
$query = 'SELECT row FROM table WHERE '.implode(' OR ', $conditions);
您需要调整此字段以满足您的需要,例如。我在上面回答过,我认为由于您的字段是可选的,您不需要使用SQL,而且,有些时候=也不太好,您可以在大多数情况下使用LIKE,如location,price from可以是a>=等。请注意 我在上面回答了,我认为由于您的字段是可选的,您不需要使用SQL,而且,有时=也不太好,您可以在大多数情况下使用LIKE,例如location,price from可以是>=等。请注意 嗯,在我看来,您可以将表字段的默认值设置为NULL,然后插入表值“{$\u REQUEST['city']}”……根据标题,我认为这是关于选择而不是插入。在我看来,您可以将表字段的默认值设置为NULL,然后插入表值“{$\u REQUEST['city']}”,…根据标题,我认为这是关于选择而不是插入。我随意添加了mysql\u real\u escape\u字符串,mysql\u escape\u字符串不受欢迎。我随意添加了mysql\u real\u escape\u字符串,mysql\u escape\u字符串不受欢迎