SQL字符串与if语句串联

Question

I have simple query for full text search, data comes from HTML form inputs. If statement checks or it was filled all three inputs with array_key_exists and then concatenate all strings, but if someone didn't fill first or second input and then my query WHERE part is WHERE AND contract = $var so in this situation AND is not needed. What is solution for my problem, how i can solve this? When AND is needed just add to query string and when didn't needed don't add.

    $sql = "SELECT 
                slug, 
                title, 
                company, 
                location, 
                email, 
                street, 
                city, 
                phone, 
                url, 
                description, 
                image, 
                created_at 
                FROM jobs
                WHERE ";

    array_key_exists('paieska', $segment) ? $sql .= "MATCH(title, description) AGAINST('".urldecode($segment['paieska'])."') " : '';
    array_key_exists('darbo-laikas', $segment) ? $sql .= "AND contract = '".$segment['darbo-laikas']."' " : '';
    array_key_exists('miestas', $segment) ? $sql .= "AND location = '".$segment['miestas']."'" : '';

Answer 1

The easiest solution is to just add a 1 to the original where statement (And AND before your first $sql if statement). This will always be true, and will return all the records.

If darbo-laikas exists, your query would be ...FROM jobs WHERE 1 AND contract... which would work correctly.

$sql = "SELECT 
            slug, 
            title, 
            company, 
            location, 
            email, 
            street, 
            city, 
            phone, 
            url, 
            description, 
            image, 
            created_at 
            FROM jobs
            WHERE 1 ";

array_key_exists('paieska', $segment) ? $sql .= "AND MATCH(title, description) AGAINST('".urldecode($segment['paieska'])."') " : '';
array_key_exists('darbo-laikas', $segment) ? $sql .= "AND contract = '".$segment['darbo-laikas']."' " : '';
array_key_exists('miestas', $segment) ? $sql .= "AND location = '".$segment['miestas']."'" : '';

Answer 2

try this, add 'AND' in every last statement

array_key_exists('paieska', $segment) ? $sql .= "MATCH(title, description) AGAINST('".urldecode($segment['paieska'])."') AND " : '';
array_key_exists('darbo-laikas', $segment) ? $sql .= "contract = '".$segment['darbo-laikas']."' AND " : '';
array_key_exists('miestas', $segment) ? $sql .= "location = '".$segment['miestas']."' AND " : '';

before execute, delete last char('AND') using

rtrim($sql, "AND ")

note: rtrim should with whitespace, because your 'AND ' using whitespace too