[英]MySQLi prepared statement with dynamic update query
我正忙於從普通的 mysql_queries 更改為准備好的語句,現在我發現了一個 function,它根據有多少字段不為空來生成動態查詢。
我設法對其進行了轉換,以便將每個字段作為單獨的查詢運行,但是有沒有辦法將所有這些查詢放入一個查詢而不轉換為 PDO?
public function edit($ticket_id, $department_id = '', $location_id = '', $ticketcat_id = '', $ticketsta_id = '',
$ticketmed_id = '', $ticketpri_id = '', $ticket_assigned = '', $ticket_plandate = '',
$ticket_user_name = '', $ticket_user_email = '', $ticket_user_phone = '', $ticket_subject = '') {
$data = array(
array('field' => 'department_id', 'value' => $department_id, 'type' => 'i'),
array('field' => 'location_id', 'value' => $location_id, 'type' => 'i'),
array('field' => 'ticketcat_id', 'value' => $ticketcat_id, 'type' => 'i'),
array('field' => 'ticketsta_id', 'value' => $ticketsta_id, 'type' => 'i'),
array('field' => 'ticketmed_id', 'value' => $ticketmed_id, 'type' => 'i'),
array('field' => 'ticketpri_id', 'value' => $ticketpri_id, 'type' => 'i'),
array('field' => 'ticket_assigned', 'value' => $ticket_assigned, 'type' => 'i'),
array('field' => 'ticket_plandate', 'value' => $ticket_plandate, 'type' => 's'),
array('field' => 'ticket_user_name', 'value' => $ticket_user_name, 'type' => 's'),
array('field' => 'ticket_user_email', 'value' => $ticket_user_email, 'type' => 's'),
array('field' => 'ticket_user_phone', 'value' => $ticket_user_phone, 'type' => 's'),
array('field' => 'ticket_subject', 'value' => $ticket_subject, 'type' => 's')
);
foreach($data as $id => $data_) {
IF(empty($data_['value'])) unset($data[$id]);
}
IF(count($data) > 0) {
$errors = false;
$query = 'UPDATE tickets SET ';
foreach($data as $id => $values) {
$query2 = $query.$values['field'].' = ? WHERE ticket_id = ? ';
echo $query2.'<br />';
IF($stmt = $this->db->prepare($query2)) {
$types = $values['type'].'i';
$stmt->bind_param($types, $values['value'], $ticket_id);
IF(!($stmt->execute())) {
$errors = true;
}
$stmt->close();
}
}
IF(!$errors) {
$this->db->commit();
return true;
}
return false;
}
}
訣竅是構造一個包含您要綁定的參數的數組,然后在call_user_func_array
的幫助下,您可以將此數組傳遞給bind_param
。
有關call_user_func_array
的詳細信息,請參閱http://www.php.net/manual/en/function.call-user-func-array.php 。
您的代碼可能類似於:
$para_type="";
/* $para is the array that later passed into bind_param */
$para=array($para_type);
$query = 'UPDATE tickets SET ';
IF(count($data) != 0) {
/* Looping all values */
foreach($data as $k=>$d) {
$query .= '`'.$d['field'].'` = ? ,';
$para_type .=$d['type'];
$para[] = &$data[$k]['value'];
}
/* removing last comma */
$query[(strlen($query)-2)] = '';
/* adding where */
$query .= ' WHERE `ticket_id` = ?';
$para_type .= 'i';
$para[]=&$ticket_id;
call_user_func_array(array($stmt, 'bind_param'), $para);
return true;
}
注意所有參數前面的&
,它是bind_param
所必需的。
我認為更好的另一種方法是使用 PDO。 它采用命名參數並且可以進行增量綁定。
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