prepared-statement

问题 Although there are some good examples of multiple parameters being used in MySQL stored procedures, I have been unable to find a simple example that shows how to use them in a stored procedure that is prepared . The code below returns 'Incorrect arguments to EXECUTE' when calling it using: `call test_parms('my report','example.com'); I've tried with and without '@' in front of the parameter names (just gives an unknown column error), and different variations of the code . What am I doing

问题 Next to the addBatch() method of PreparedStatement there is also an addBatch(String) method in the Statement class. I want to process a series of different sql statements and am looking for some clarification on what addBatch(String) means performance-wise. Is it safe (and fast) to use this method or is it better to group similar sql-statements in Java and execute them in groups? 回答1: Batch Processing allows you to group related SQL statements into a batch and submit them with one call to the

问题 Whats the point for php developer to create function bind_result, as it seems get_result work fine too. if($stmt=$mysqli->prepare("SELECT member_ID FROM members where hair=? and hand=?")){ if($stmt->bind_param('ss',$hair,$hand)){ if($stmt->execute){ $result=$stmt->get_result(); while($line=$result->fetch_assoc()){ echo $line['member_ID']; } // ------------ versus ------------------- // $stmt->store_result(); // $stmt->bind_result($member_ID); // while($stmt->fetch()){ // echo $member_ID; // }

问题 How can I make an prepared statement of this one? Statement stmt = con.createStatement(); long lastid = getLastId(stmt); // create a SQL query String strQuery = "INSERT INTO studenten " + " (id, naam, adres, postcode, plaats, geboren) " + " VALUES (" + (lastid+1) + "," + "'" + contact.getNaam() + "'," + "'" + contact.getAdres() + "'," + "'" + contact.getPostcode() + "'," + "'" + contact.getPlaats() + "'," + "{d '" + contact.getGeboren() + "'}" + ") "; stmt.executeUpdate(strQuery); stmt.close(

问题 I do understand that the prepared statements is the ultimate way to seek protection against the SQL injection. However, they provide coverage in a limited fashion; for example, in cases where I let the user to decide how the order by operation to be ( i.e, is it ASC or DESC? etc ), I get no coverage there with the prepared statements. I understand that I can map the user input to a pre-defined white list for that. But, this is only possible when a whitelist can be created or guessed

问题 I want to do an upsert. Rails doesn't support this yet. The query is something like this: INSERT INTO foos (thing_id, bar_id) VALUES (1, 2) ON CONFLICT (thing_id, bar_id) DO NOTHING I can easily do this with self.class.connection.execute or exec_insert . But I want to also leverage prepared statements. I thought I can do this like so: thing_id = ActiveRecord::Relation::QueryAttribute.new("thing_id", thing.id, ActiveRecord::Type::Integer.new) bar_id = ActiveRecord::Relation::QueryAttribute.new

问题 Problem How to call two MySQL stored procedures in the same mysqli connection using prepared statements (or another query method equally safe against SQL injections) without getting the following errors: Warning: Packets out of order. Expected 1 received 61. Packet size=7 in /... Warning: mysqli::prepare(): MySQL server has gone away in /... Got the code hooked up online at tutorialspoint Story I'm making a PHP backend with a MySQL database. I have two results that I want to get from one

问题 The understanding of PDO that I've had up till now is that PDO will use real prepared statements where it can, and emulate them where it can't. I also understood that where mysql was concerned, real prepared statements would be used provided you were communicating with a version of mysql that supported them. In fact the PHP manual page for the MySQL PDO driver says as much. http://php.net/manual/en/ref.pdo-mysql.php However, on another SO question I was helping out on How to replace all

问题 From Java, I'm calling a prepared statement in Postgresql with an insert that has a RETURNING clause for my identity column. In PG admin it comes right back, but not sure how to get it from my prepared statement: String insertStatement = "INSERT INTO person(\n" + " name, address, phone, customer_type, \n" + " start_dtm)\n" + " VALUES (?, ?, ?, ?, \n" + " ?)\n" + " RETURNING person_id;"; PreparedStatement stmt = connection.prepareStatement(insertStatement); stmt.setObject(1, perToSave.getName

问题 I'm trying to fetch rows that are in an array of integers that I have using Zend Framework 1.11. $this->dbSelect ->from($table_prefix . 'product_link') ->joinLeft($table_prefix . 'product_link_name', $table_prefix . 'product_link.product_link_name_ref_id = ' . $table_prefix . 'product_link_name.product_link_name_id') ->where('product_ref_id IN (?)', implode(', ', $product_ids)); When I use the __toString() method of $this->dbSelect , I get SELECT `phc_distrib_product_link`.*, `phc_distrib