pdo

问题 I have got that error and the line was this: public function __destruct() { $this->db->close(); } I use PDO, is this the problem, does the PDO driver not recognize this function? If yes, what is its equivalent in PDO? 回答1: A PDO connection is closed by destroying its object: The connection remains active for the lifetime of that PDO object. To close the connection, you need to destroy the object by ensuring that all remaining references to it are deleted--you do this by assigning NULL to the

问题 Echoing to my previous question about SQL-injection. I'm trying to set up a PDO connection. For that I want to replace my old code with the new: Here is the old $conn = mysql_connect("localhost", "sec", "dubbelgeheim") or die('Error: ' . mysql_error()); mysql_select_db("bookshop"); $SQL = "select * from productcomment where ProductId='" . $input . "'"; $result = mysql_query($SQL) or die('Error: ' . mysql_error()); $row = mysql_fetch_array($result); if ($row['ProductId']) { echo "Product:" .

问题 Hi I have written a MySQL statement that has a conditional order by clause which you can see in the example below. MySQL Example: SELECT title, description FROM books WHERE title LIKE "%keyword%" OR description LIKE "%keyword%" ORDER BY CASE WHEN title LIKE "%keyword%" THEN 1 ELSE 2 END I am now trying to recreate this statement in Drupal using its PDO style db_select() function. But I have got stuck when writing the ORDER BY clause. Drupal Example: $node_select = db_select('node', 'n');

问题 Suppose I have the following table: mysql> CREATE TABLE example ( -> `id` INT(10) NOT NULL PRIMARY KEY AUTO_INCREMENT, -> `stuff` VARCHAR(255) NOT NULL -> ); Query OK, 0 rows affected (0.06 sec) The stuff column was declared as NOT NULL . When a null value gets passed to it in a prepared statement, it naturally fails. Thus: mysql> PREPARE test FROM "INSERT INTO example (stuff) VALUES (?)"; Query OK, 0 rows affected (0.00 sec) Statement prepared mysql> SET @a = NULL; Query OK, 0 rows affected

问题 I'm currently trying to pass a DB connection as follows: class Test { public $user; public $db; function __construct() { // connect to database try { $this->db = new PDO('mysql:host='.DB_HOST.';dbname='.DB_DATABASE.'', DB_USERNAME, DB_PASSWORD); $this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch(PDOException $err) { die($err->getMessage()); } $this->user = new User($this->db); } } class User { public $db; function __construct($db) { $this->db = $db; } // execute some

问题 So far I've got this code: $column_name = strtolower($_POST['<user input>']); if(!preg_match('/[^A-Za-z0-9.#\\-$]/', $column_name)){ if(!empty($column_name)){ $st = $db_pdo->prepare("DESCRIBE <table name>"); $st->execute(); $st = $st->fetchAll(PDO::FETCH_COLUMN); $compare = $st; foreach($compare as $key){ if($key === $column_name){ die('Project name already exists. Please select a different name.'); } } $st = $db_pdo->prepare("ALTER TABLE emails ADD <column name> varchar"); $st->execute(); }

问题 So far I've got this code: $column_name = strtolower($_POST['<user input>']); if(!preg_match('/[^A-Za-z0-9.#\\-$]/', $column_name)){ if(!empty($column_name)){ $st = $db_pdo->prepare("DESCRIBE <table name>"); $st->execute(); $st = $st->fetchAll(PDO::FETCH_COLUMN); $compare = $st; foreach($compare as $key){ if($key === $column_name){ die('Project name already exists. Please select a different name.'); } } $st = $db_pdo->prepare("ALTER TABLE emails ADD <column name> varchar"); $st->execute(); }

问题 I'm trying to use a prepared PDO statement for use in a database query that looks like the following, where the placeholders variables are represented by the numbers in quotes, i.e., "123" and "456": SELECT `user_ID` as `ID` FROM `usermeta` WHERE (`meta_key` = 'custom_fields') AND (`meta_value` REGEXP '.*"ABC";.*s:[0-9]+:"123".*') AND (`meta_value` REGEXP '.*"DEF";.*s:[0-9]+:"456".*') My question is, would the best practice be to bind to the whole REGEX expression, or just the "123" and "456"

问题 I'm trying to use a prepared PDO statement for use in a database query that looks like the following, where the placeholders variables are represented by the numbers in quotes, i.e., "123" and "456": SELECT `user_ID` as `ID` FROM `usermeta` WHERE (`meta_key` = 'custom_fields') AND (`meta_value` REGEXP '.*"ABC";.*s:[0-9]+:"123".*') AND (`meta_value` REGEXP '.*"DEF";.*s:[0-9]+:"456".*') My question is, would the best practice be to bind to the whole REGEX expression, or just the "123" and "456"

问题 I feel like I'm losing my mind on this one. I have three simple tables. A user table, a roles table, and a role_user table that joins the user and roles in a many to many relationship. I have the following code to the roles for a user: $query = $pdo->prepare('select roles.* from roles inner join role_user on roles.id = role_user.role_id where role_user.user_id = ?'); $query->execute(array('1')); die(var_dump($query->fetchAll())); This returns an empty array. No results. However, if I change