[英]Possible to have PHP MYSQL query ignore empty variable in WHERE clause?
[英]try to have PHP MYSQL query ignore empty variable in WHERE clause
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$institute = $_POST['institute'];
if (isset($_POST['sections'])) {
$sections = $_POST['sections'];
}
if (isset($_POST['division'])) {
$division = $_POST['division'];
}
if (isset($_POST['level'])) {
$level = $_POST['level'];
}
//check empty var
$where = "WHERE a.institute =?";
$bind = "i";
$prams = "$institute, ";
if (!empty($sections)) {
$where .= "AND a.section = ?";
$bind .= "i";
$prams .= "$sections, ";
}
if (!empty($division)) {
$where .= "AND a.division =?";
$bind .= "i";
$prams .= "$division, ";
}
if (!empty($level)) {
$where .= "AND a.phase =?";
$bind .= "i";
$prams .= "$level";
}
//var_dump($institute, $sections, $division, $level);
var_dump($bind);
//$getSearch = $db->prepare("SELECT * FROM student_basic_info WHERE institute =? AND section = ? AND division =?");
$getSearch = $db->prepare("SELECT
a.*, a.id AS stud_id, b.id, b.ins_name, c.id, c.sec_name, d.id, d.div_name
FROM student_basic_info AS a
JOIN institutes AS b ON (a.institute = b.id)
CROSS JOIN ins_sections AS c ON (a.section = c.id)
CROSS JOIN ins_division AS d ON (a.division = d.id)
$where GROUP BY a.id
");
$studSearch = array();
$getSearch->bind_param("'".$bind."'", $prams);
if ($getSearch->execute()) {
$results = $getSearch->get_result();
while ($vStud = mysqli_fetch_array($results)) {
$studSearch[] = $vStud;
?>
得到
(!)致命錯誤:在第59行上的非對象上調用成員函數bind_param()
59行是
$getSearch->bind_param("'".$bind."'", $prams);
解決了Call to a member function bind_param()
現在得到Warning: mysqli_stmt::bind_param(): Number of elements in type definition string doesn't match number of bind variables
看起來$getSearch
為空(false)。 檢查您的prepare
功能。 成功應該返回true
。
if ($getSearch = $db->prepare(...)) {
$getSearch->bind_param(...);
...
}
else {
printf("Errormessage: %s\n", $db->error);
}
您需要在空格中添加AND
條件; 現在您的sql無效,並且prepare
將失敗:
$where .= " AND a.section = ?";
^ here
// etc.
但是,現在您的綁定將失敗,您無法連接值並發送一個長字符串作為第二個參數。 您需要分別綁定每個值。
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