动态创建一个mysql搜索字符串? [英] creating a mysql search string dynamically?

问题描述

我正在尝试创建一个简单的搜索页面，但我不是 100% 确定如何编写实际的搜索字符串(如果变量存在，则使用适当的 AND 等)这里是代码:

I'm trying to create a simple search page, but I'm not 100% sure how to write the actual search string (using the appropriate AND's etc if the variable exists) here's the code:

if ($post) {

    //get all search variables
    $type = JRequest::getVar('type');
    $classifications = JRequest::getVar('classifications', array(0), 'post', 'array');
    $rating = JRequest::getVar('rating');
    $status = JRequest::getVar('status');
    $cterms = JRequest::getVar('cterms');
    $clientid = JRequest::getVar('clientid');
    $company = JRequest::getVar('company');
    $address = JRequest::getVar('address');
    $name = JRequest::getVar('name');
    $surname = JRequest::getVar('surname');
    $city = JRequest::getVar('city');
    $state = JRequest::getVar('state');
    $pcode = JRequest::getVar('pcode');
    $country = JRequest::getVar('country');

    //create search string
    echo "SELECT * FROM #__db_clients "; <- the query is supposed to be done here.. it's in as echo because I was trying to spit it out before trying to make it run.. :)

} else {

    echo 'There has been an error, please try again.';

};

我试过使用 (if type != null then searchtype = "where type = 'X'") 但后来我不知道如何在搜索需要之前/之后放置 AND ..如果这是有道理的?

I've tried using (if type != null then searchtype = "where type = 'X'") but then I couldn't figure out how to place the AND before/after if it's required for the search.. if that makes sense?

推荐答案

这是一个简单的例子.我不知道 JRequest::getVar 返回什么样的数据(总是字符串还是混合类型?)但这应该会让你开始.确保使用适用于 foreach 循环的任何转义方法:

This is a quick example. I don't know what kind of data JRequest::getVar returns (always a string, or mixed types?) but this should start you off. Make sure to use whichever escaping method applies within the foreach loop:

if ($post) {
    $criteria = array();
    //get all search variables
    $criteria['type'] = JRequest::getVar('type');
    $criteria['classifications'] = JRequest::getVar('classifications', array(0), 'post', 'array');
    $criteria['rating'] = JRequest::getVar('rating');

    //if there are some criteria, make an array of fieldName=>Value maps
    if(!empty($criteria)) {
        $where = array();
        foreach($criteria as $k => $v) {
            //IMPORTANT!!
            //$v is the value of the field, needs to be quoted correctly!!
            $where[] = "$k = '$v'";
        }
    }
    //create search string
    $query =  "SELECT * FROM #__db_clients";

    if($where) {
        $query .= " where " . join(' AND ', $where);
    }   
} else {    
    echo 'There has been an error, please try again.';
};

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