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Fetch results from a prepared statement into the bound variables
(PHP 5)
Example 1568. Object oriented style<?phpExample 1569. Procedural style<?phpCode Examples / Notes » mysqli_stmt_fetchdan dot latter
The following function taken from PHP Cookbook 2, returns an associative array of a row in the resultset, place in while loop to iterate through whole result set. <?php public function fetchArray () { $data = mysqli_stmt_result_metadata($this->stmt); $fields = array(); $out = array(); $fields[0] = &$this->stmt; $count = 1; while($field = mysqli_fetch_field($data)) { $fields[$count] = &$out[$field->name]; $count++; } call_user_func_array(mysqli_stmt_bind_result, $fields); mysqli_stmt_fetch($this->stmt); return (count($out) == 0) ? false : $out; } ?> typer85
Just a side note, I see many people are contributing in ways to help return result sets for prepared statements in ASSOSITAVE arrays the same as the mysqli_fetch_assos function might return from a normal query issued via mysqli_query. This is done, in all the examples I have seen, by dynamically getting the field names in the prepared statement and binding them using 'variable' variables, which are variables that are created dynamically with the name of the field names. Some thing though you should take into consideration is illegal variable names in PHP. Assume that you have a field name in your database table named 'My Field' , notice the space between 'My' and 'Field'. To dynamically create this variable is illegal in PHP as variables can not have spaces in them. Furthermore, you won't be able to access the binded data as you can not reference a variable like so: <?php // Syntax Error. echo $My Table; ?> The only suitable solution I find now is to replace all spaces in a field name with an underscore so that you can use the binded variable like so: <?php // This Works. echo $My_Table; // Notice the space is now replaced with an underscore. ?> All you simply have to do is before you dynamically bind the data, so a string search for any spaces in the table name, replace them with an underscore, THEN bind the variable. That way you should not run into problems. andrey
IMPORTANT note: Be careful when you use this function with big result sets or with BLOB/TEXT columns. When one or more columns are of type (MEDIUM|LONG)(BLOB|TEXT) and ::store_result() was not called mysqli_stmt_fetch() will try to allocate at least 16MB for every such column. It _doesn't_ matter that the longest value in the result set is for example 30 bytes, 16MB will be allocated. Therefore it is not the best idea ot use binding of parameters whenever fetching big data. Why? Because once the data is in the mysql result set stored in memory and then second time in the PHP variable.
php
I wanted a simple way to get the equivalent of fetch_assoc when using a prepared statement. I came up with the following: <?php $mysqli = new mysqli($dbHost, $dbUsername, $dbPassword, $dbDatabase); $stmt = $mysqli->prepare('select * from foobar'); $stmt->execute(); $stmt->store_result(); $meta = $stmt->result_metadata(); // the following creates a bind_result string with an argument for each column in the query // e.g. $stmt->bind_result($results["id"], $results["foo"], $results["bar"]); $bindResult = '$stmt->bind_result('; while ($columnName = $meta->fetch_field()) { $bindResult .= '$results["'.$columnName->name.'"],'; } $bindResult = rtrim($bindResult, ',') . ');'; // executes the bind_result string eval($bindResult); $stmt->fetch(); echo var_dump($results); // outputs: // // array(3) { // ["id"]=> // &int(1) // ["foo"]=> // &string(11) "This is Foo" // ["bar"]=> // &string(11) "This is Bar" // } ?> |
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