我正在使用 PHP 和 MYSQL 完成一项作业。
任务之一是搜索任意字段组合。这包括从数据库填充的下拉框。和文本字段。
t2ath 包含
ID
SPORT
COUNTRY
GENDER
FIRSTNAME
LASTNAME
Image
我已经为此代码工作了一个星期，以便能够毫无错误地搜索任何组合。
我想知道是否有另一种更有效的方法来做到这一点。
$selectedSport = $_POST['sport']; $gender =$_POST['gender']; $fName =$_POST['fname']; $lName =$_POST['lname']; $country =$_POST['country'];
$sql_fName=""; $sql_lName=""; $sql_gender=""; $sql_sport=""; $sql_country="";
$checkFiled=False;
$where="";
$and="";
//
if ( $selectedSport=="showAll")
{
!isset($selectedSport);
}
else
{
if (isset($selectedSport))
{
if ($checkFiled==True)
{
$sql_sport = " AND t2ath.sport = '$selectedSport'" ;
}
else
{
$sql_sport = " t2ath.sport = '$selectedSport' " ;
$checkFiled=True;
}
}
else {
$sql_sport = "";
}
}
//
if ( $country =="showAll")
{
!isset($country);
}
else
{
if (isset($country))
{
if ($checkFiled ==True)
{
$sql_country = " AND t2ath.country = '$country'" ;
}
else
{
$sql_country = " t2ath.country = '$country' " ;
$checkFiled=True;
}
}
else {
$sql_country = "";
}
}
//
if ( $gender=="Gender")
{
!isset($gender);
}
else
{
if (isset($gender))
{
if ($checkFiled ==True)
{
$sql_gender = " AND t2ath.gender = '$gender'" ;
}
else
{
$sql_gender = " t2ath.gender = '$gender' " ;
$checkFiled=True;
}
}
else {
$sql_gender = "";
}
}
//
if ($fName =="")
{
!isset($fName);
}
else
{
if (isset($fName))
{
if ($checkFiled==True)
{
$sql_fName = " AND t2ath.firstName = '$fName'" ;
}
else
{
$sql_fName = " t2ath.firstName = '$fName' " ;
$checkFiled=True;
}
}
else {
$sql_fName = "";
}
}
//
if ($lName =="")
{
!isset($lName);
}
else
{
if (isset($lName))
{
if ($checkFiled==True)
{
$sql_lName = " AND t2ath.lastName = '$lName' " ;
}
else
{
$sql_lName = " t2ath.lastName = '$lName' " ;
$checkFiled=True;
}
}
else
{
$sql_lName = "";
}
}
if ($checkFiled == True)
$where=" where ";
$selectString = "SELECT t2ath.lastName,t2ath.firstName,t2ath.image,t2ath.sport,t2ath.gender,t2ath.country,t2country.flag FROM t2ath LEFT JOIN t2country
ON t2ath.country = t2country.name $where $sql_sport $sql_country $sql_gender $sql_fName $sql_lName ";
$result = mysql_query($selectString);
最佳答案
不要使用有关在连接查询时是否添加 AND 的所有条件，而是使用数组和 implode。
$fields = array('sport' => 'sport',
'gender' => 'gender',
'fname' => 'firstName',
'lname' => 'lastName',
'country' => 'country');
$wheres = array();
foreach ($fields as $postfield => $dbfield) {
if ($_POST[$postfield] != 'showAll') {
$wheres[] = "$dbfield = '" . mysql_real_escape_string($_POST[$postfield]) . "'";
}
}
$selectString = "SELECT t2ath.lastName, t2ath.firstName, t2ath.image, t2ath.sport, t2ath.gender, t2ath.country, t2country.flag
FROM t2ath LEFT JOIN t2country
ON t2ath.country = t2country.name";
if (count($wheres) > 0) {
$selectString .= " WHERE " . implode(" AND ", $wheres);
}
$result = mysql_query($selectString);
要了解如何使用 PDO 准备好的语句进行类似的操作，请参阅我的答案:What code approach would let users apply three optional variables in PHP/MySQL?
关于php - 使用 PHP 和 MYSQL 组合字段搜索，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21691675/