prepared-statement

问题 I am getting different results performing the exact same query using regular statements and prepared statements, and I think it's a type conversion bug. mysql> show columns from server where field = "vlan"; +-------------+--------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+--------+------+-----+---------+-------+ | vlan | int(5) | YES | MUL | NULL | | +-------------+--------+------+-----+---------+-------+ mysql> select hostname from server

问题 I'm currently using HSQLDB to save java data. Within theses datas, there are some Double, and some of them can be of values of NaN (described as 0.0/0.0 in the javadoc). HSQLDB know how to handle these values in setDouble and setFloat of PreparedStatement . The thing is, I have to use a Statement object, not a precompiled stored procedure, and I just can't find a way to make it work. If you had the tinyest hint, it would be most welcome :) Thanks. EDIT : Here's the bunch of code I'm using :

问题 I'm using my own class for database queries, extending mysqli: class iDatabase extends mysqli { public $errorMsg; private $totalQueries; private $stmt; public function __construct() { parent::__construct( 'localhost', 'asd', 'asd', 'asd' ); if ( mysqli_connect_errno() ) { $this->errorMsg = 'Could not connect to server.<br /><i>' . mysqli_connect_error() . '</i>.'; return; } parent::query( 'SET NAMES utf8' ); } } However I'm running into trouble when executing queries and getting back results.

问题 I understand that I need to implement whitelists and prepared-statements into my php code. But I'm not sure how to do this with Postgresql and is it really necessary for my code? I'm using select lists to pass the users selected values to the query. <?php include "connect.php"; $table = $_POST['tableSelected']; $field = $_POST['fieldSelected']; $attribute = $_POST['attributeSelected']; $operator = $_POST['operatorSelected']; $fieldList = $_POST['fieldList']; $fieldstr = $fieldList . ",ST

问题 Here is my Java JDBC code (modified and simplified for example): ps = connection.prepareStatement("SELECT a,b,c FROM mytable WHERE category ~ ?"); ps.setString(1, "my/super/category/abc(def"); ^ | +---------------------------------+ | //this character is problem result = ps.executeQuery(); It didn't work because of round bracket in string. How to escape round brackets in prepared statement? EDIT: based on my answer (see below) I do correct to question. 回答1: Will answer myself - problem is in

问题 I would like to return all the results from my prepared query (mysqli) as objects in an array but i cant find a fetchall method or something similar. How do i go about this? public function getImageResults ($search_term) { if (empty($search_term)) return false; $image_query = $this->db_connection->stmt_init(); $image_query_sql = " SELECT Images.url as url FROM Images, ImageSearch, ImageSearchResults WHERE ImageSearch.search_string = ? AND ImageSearchResults.search_id = ImageSearch.id AND

问题 This question already has answers here : mysqli_stmt::bind_param(): Number of elements in type definition string doesn't match number of bind variables (3 answers) Closed 2 years ago . I use a dynamic database class I constructed for all my projects. Just started with a new one, and the class is giving me a hiccup. This is my code, not the details. But I recreated the error through minimal code. function vref($arr) { if (strnatcmp(phpversion(),'5.3') >= 0) {//Reference is required for PHP 5.3

问题 I am trying to make a simple search process with (noob) codes like this: $prep->prepare("SELECT * FROM details WHERE id REGEXP '?'"); $prep->bind_param("s", $search_query); It gives me this warning: Warning: mysqli_stmt::bind_param(): Number of variables doesn't match number of parameters in prepared statement I am guessing it could be because the question mark is also used for RegExp (optional previous character). Any idea about how to use REGEXP inside prepared statements (without

问题 Is it necessary to close ResultSet and PreparedStatement within one db.getConnection()? For the example below: Connection conn = db.getConnection(); PreparedStatement pstmt = conn.prepareStatement(firstsql); ResultSet r = pstmt.executeQuery(); // do something with the ResultSet r.close(); pstmt.close(); // do I need close the r and pstmt here? PreparedStatement pstmt = conn.prepareStatement(secondsql); ResultSet r = pstmt.executeQuery(); // do something with the ResultSet again r.close();

问题 I am new to PDO and I was wondering if there was an equivalent to a mysql statement that checks if a parameter is not null such as: SELECT * FROM table WHERE param IS NOT NULL I tried this: $pdo->prepare('SELECT * FROM ' . $tablename . ' WHERE ' . $field . ' = :' . $field . 'AND param IS NOT NULL'); without any success. I also looked on the web, but did not find anything relevan, can anyone help please ? 回答1: You can use any query in pdo that you could use in mysql directly but your way of