I want to access randomly to a result sets retuned from a Stored Procedure using PDO Mysql and PHP. I found PDOStatement::nextRowset but the access to the result sets seems to be sequential.
EDIT
I'm looking for some like this:
$pdo = new PDO("mysql:host=$server;port=$port;dbname=$dbname;charset=utf8", $user, $pass, array(PDO::ATTR_PERSISTENT => false));
$statement = "CALL FooSP()";
$query = $pdo->prepare($statement);
$query->execute();
$query->resultSet[1][0]["ColumnFoo"] // Second Resultset, first row, column "ColumnFoo"
$query->resultSet[3][1]["ColumnBar"] // third Resultset, second row, columna "ColumnBar"
$query->resultSet[0][0]["Column1"] // first Resultset, first row, columna "Column1"
Can anyone help me?
If You need all resultsets - just prefetch them using next rowset like this:
<?php
$sql = 'CALL multiple_rowsets()';
$stmt = $conn->query($sql);
$fetched_rowsets = array();
do {
$rowset = $stmt->fetchAll(PDO::FETCH_NUM);
if ($rowset)
{
$fetched_rowsets[] = $rowset;
}
# This is important part.
} while ($stmt->nextRowset());
#Now You got the table with all data from all resultsets, fetched in PHP memory.
$fetched_rowsets[1][0]["ColumnFoo"];
$fetched_rowsets[3][1]["ColumnBar"];
$fetched_rowsets[0][0]["Column1"];
?>
Just remember that it can be memory consuming.
Related
I'm new to php. I am making a call to store procedure that returns multiple result sets in MYSQL.
I can't seem to get PHP PDO to get the second result set. I only get the first. Any help is appreaciated
--more info
store procedure just makes to select statements like so
select * from Product where productId = id;
select url from Images where product_id = id;
PHP Code:
$conn = new PDO('mysql:host=localhost;dbname=salamancju_HardGraft', $this->userName, $this->password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$conn->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
$stmt = $conn -> prepare('call GetProductById(:id)');
$stmt->execute( array(':id' => $id));
$results = array();
do {
$results = $results + $stmt->fetchAll(PDO::FETCH_NUM);
} while ($stmt->nextRowset());
echo json_encode($results);
Your problem has nothing to do with stored procedures.
+ operator on arrays works not the way you think. Use [] instead:
do {
$results[] = $stmt->fetchAll(PDO::FETCH_NUM);
} while ($stmt->nextRowset());
will produce a nested array. If you want another format, please provide an example.
Save for this issue, your code is perfect. Most people who aren't new to PHP, won't be able to make it ever.
Right now im using Mysqli to retrieve data from a Mysql Database, The code im using is difficult to understand and from my understanding has depreciated functions or itself in entire is depreciated.
If i could get some insight and maybe some updated techniques on my Qoal of retrieving data from a mysql DB.
mysqli prepared statements
What i have so far is this:
$param = 1;
$mysqli = new mysqli("127.0.0.1", "user", "password", "databaseName");
$mysqli->query('SELECT reply_id FROM replies WHERE reply_topic = ? ORDER BY reply_date ASC');
$mysqli->bind_param('i',$param)
$mysqli->execute();
$row = bind_result_array($mysqli);
while($mysqli->fetch()){
$set[$row['']] = getCopy($row);
}
$mysqli->free_result();
return $set;
function bind_result_array($stmt)
{
$meta = $stmt->result_metadata();
$result = array();
while ($field = $meta->fetch_field())
{
$result[$field->name] = NULL;
$params[] = &$result[$field->name];
}
call_user_func_array(array($stmt, 'bind_result'), $params);
return $result;
}
function getCopy($row)
{
return array_map(create_function('$a', 'return $a;'), $row);
}
You need to clean up the call on the database first. $mysqli->query has send the query before you bound parameters and so on.
Replace with the following;
$stmt = $mysqli->prepare('SELECT reply_id FROM replies WHERE reply_topic = ? ORDER BY reply_date ASC');
$stmt->bind_param('i',$param)
$stmt->execute();
The $mysqli->prepare returns a new object that you should bind values to and then execute. It avoids SQL injection!
None of this is depreciated. mysqli_ is exactly what you should use.
As all you want is an array of the results, you can use the following code to do so - no user functions required.
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
$set[] = $row['reply_id'];
}
For each row in the while, each field is saved into an array with the column name as the key. So $row['reply_id'] contains the value of the reply_id column in the database. Above I have saved this value to an array called $set, and when it loops over the next result row it saves the next value to that array too.
You can manipulate the result before or after saving it to the new array, as you see fit.
Hope this helps.
Below is some poorly written and heavily misunderstood PHP code with no error checking. To be honest, I'm struggling a little getting my head around the maze of PHP->MySQLi functions! Could someone please provide an example of how one would use prepared statements to collect results in an associative array whilst also getting a row count from $stmt? The code below is what I'm playing around with. I think the bit that's throwing me off is using $stmt values after store_result and then trying to collect an assoc array, and I'm not too sure why...
$mysqli = mysqli_connect($config['host'], $config['user'], $config['pass'], $config['db']);
$stmt = $mysqli->prepare("SELECT * FROM licences WHERE generated = ?");
$stmt->bind_param('i', $core['id']);
$result = $stmt->execute();
$stmt->store_result();
if ($stmt->num_rows >= "1") {
while($data = $result->fetch_assoc()){
//Loop through results here $data[]
}
}else{
echo "0 records found";
}
I feel a little cheeky just asking for code, but its a working demonstration of my circumstances that I feel I need to finally understand what's actually going on. Thanks a million!
I searched for a long time but never found documentation needed to respond correctly, but I did my research.
$stmt->get_result() replace $stmt->store_result() for this purpose.
So, If we see
$stmt_result = $stmt->get_result();
var_dump($stmt_result);
we get
object(mysqli_result)[3]
public 'current_field' => int 0
public 'field_count' => int 10
public 'lengths' => null
public 'num_rows' => int 8 #That we need!
public 'type' => int 0
Therefore I propose the following generic solution. (I include the bug report I use)
#Prepare stmt or reports errors
($stmt = $mysqli->prepare($query)) or trigger_error($mysqli->error, E_USER_ERROR);
#Execute stmt or reports errors
$stmt->execute() or trigger_error($stmt->error, E_USER_ERROR);
#Save data or reports errors
($stmt_result = $stmt->get_result()) or trigger_error($stmt->error, E_USER_ERROR);
#Check if are rows in query
if ($stmt_result->num_rows>0) {
# Save in $row_data[] all columns of query
while($row_data = $stmt_result->fetch_assoc()) {
# Action to do
echo $row_data['my_db_column_name_or_ALIAS'];
}
} else {
# No data actions
echo 'No data here :(';
}
$stmt->close();
$result = $stmt->execute(); /* function returns a bool value */
reference : http://php.net/manual/en/mysqli-stmt.execute.php
so its just sufficient to write $stmt->execute(); for the query execution.
The basic idea is to follow the following sequence :
1. make a connection. (now while using sqli or PDO method you make connection and connect with database in a single step)
2. prepare the query template
3. bind the the parameters with the variable
4. (set the values for the variable if not set or if you wish to change the values) and then Execute your query.
5. Now fetch your data and do your work.
6. Close the connection.
/*STEP 1*/
$mysqli = mysqli_connect($servername,$usrname,$pswd,$dbname);
/*STEP 2*/
$stmt = $mysqli->prepare("SELECT * FROM licences WHERE generated = ?");
/*Prepares the SQL query, and returns a statement handle to be used for further operations on the statement.*/
//mysqli_prepare() returns a statement object(of class mysqli_stmt) or FALSE if an error occurred.
/* STEP 3*/
$stmt->bind_param('i', $core['id']);//Binds variables to a prepared statement as parameters
/* STEP 4*/
$result = $stmt->execute();//Executes a prepared Query
/* IF you wish to count the no. of rows only then you will require the following 2 lines */
$stmt->store_result();//Transfers a result set from a prepared statement
$count=$stmt->num_rows;
/*STEP 5*/
//The best way is to bind result, its easy and sleek
while($data = $stmt->fetch()) //use fetch() fetch_assoc() is not a member of mysqli_stmt class
{ //DO what you wish
//$data is an array, one can access the contents like $data['attributeName']
}
One must call mysqli_stmt_store_result() for (SELECT, SHOW, DESCRIBE, EXPLAIN), if one wants to buffer the complete result set by the client, so that the subsequent mysqli_stmt_fetch() call returns buffered data.
It is unnecessary to call mysqli_stmt_store_result() for other queries, but if you do, it will not harm or cause any notable performance in all cases.
--reference: php.net/manual/en/mysqli-stmt.store-result.php
and http://www.w3schools.com/php/php_mysql_prepared_statements.asp
One must look up the above reference who are facing issue regarding this,
My answer may not be perfect, people are welcome to improve my answer...
If you would like to collect mysqli results into an associative array in PHP you can use fetch_all() method. Of course before you try to fetch the rows, you need to get the result with get_result(). execute() does not return any useful values.
For example:
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli($config['host'], $config['user'], $config['pass'], $config['db']);
$mysqli->set_charset('utf8mb4'); // Don't forget to set the charset!
$stmt = $mysqli->prepare("SELECT * FROM licences WHERE generated = ?");
$stmt->bind_param('i', $core['id']);
$stmt->execute(); // This doesn't return any useful value
$result = $stmt->get_result();
$data = $result->fetch_all(MYSQLI_ASSOC);
if ($data) {
foreach ($data as $row) {
//Loop through results here
}
} else {
echo "0 records found";
}
I am not sure why would you need num_rows, you can always use the array itself to check if there are any rows. An empty array is false-ish in PHP.
Your problem here is that to do a fetch->assoc(), you need to get first a result set from a prepared statement using:
http://php.net/manual/en/mysqli-stmt.get-result.php
And guess what: this function only works if you are using MySQL native driver, or "mysqlnd". If you are not using it, you'll get the "Fatal error" message.
You can try this using the mysqli_stmt function get_result() which you can use to fetch an associated array. Note get_result returns an object of type mysqli_result.
$stmt->execute();
$result = $stmt->get_result(); //$result is of type mysqli_result
$num_rows = $result->num_rows; //count number of rows in the result
// the '=' in the if statement is intentional, it will return true on success or false if it fails.
if ($result_array = $result->fetch_assoc(MYSQLI_ASSOC)) {
//loop through the result_array fetching rows.
// $ rows is an array populated with all the rows with an associative array with column names as the key
for($j=0;$j<$num_rows;$j++)
$rows[$j]=$result->fetch_row();
var_dump($rows);
}
else{
echo 'Failed to retrieve rows';
}
I am trying to load a list of IDs into a PHP array which I can loop through. The SQL query I am using returns 283 rows when I run it in PHPMyAdmin. However, when I run the following PHP script, it only returns a single row (the first row). How can I modify my code to include all the rows from the resulting SQL query in my PHP array?
Code:
//Get active listing IDs
$active = "SELECT L_ListingID FROM `markers`";
$active = mysql_query($active) or die(mysql_error());
if(is_resource($active) and mysql_num_rows($active)>0){
$row = mysql_fetch_array($active);
print_r($row);
};
Thanks,
Using mysql_fetch_array will return only the first row and then advance the internal counter. You need to implement it as part of a loop like the following to get what you want.
while($row = mysql_fetch_array($active)) {
// Your code here
}
Keep in mind that mysql_ functions are now also deprecated and slated to be removed in future version of php. Use mysqli_ functions or PDO.
In PDO it's rather straight forward:
$rows = $conn->query($active)->fetchAll();
See PDO::queryDocs and PDOStatement::fetchAllDocs.
With mysqli you would use mysqli_result::fetch_all and with PDO there's PDOStatement::fetchAll to fetch all rows into an array.
Code for mysqli
$sql = "SELECT L_ListingID FROM `markers`";
$result = $mysqli->query($sql);
if ($result !== false) {
$rows = $result->fetch_all();
}
with PDO it's nearly the same
$sql = "SELECT L_ListingID FROM `markers`";
$result = $pdo->query($sql);
if ($result !== false) {
$rows = $result->fetchAll();
}
Sample code:
$infoArray = array();
require_once("connectAndSelect.php");
// Connects to mysql and selects the appropriate database
$sql = "SOME SQL";
if($results = mysql_query($sql))
{
while($result = mysql_fetch_array($results, MYSQL_ASSOC))
{
$infoArray[] = $result;
}
}
else
{
// Handle error
}
echo("<pre>");
print_r($infoArray);
echo("</pre>");
In this sample code, I simply want to get the result of my query in $infoArray. Simple task, simple measures... not.
I would have enjoyed something like this:
$sql = "SOME SQL";
$infoArray = mysql_results($sql);
But no, as you can see, I have two extra variables and a while loop which I don't care for too much. They don't actually DO anything: I'll never use them again. Furthermore, I never know how to call them. Here I use $results and $result, which kind of represents what they are, but can also be quite confusing since they look so much alike. So here are my questions:
Is there any simpler method that I
don't know about for this kind of
task?
And if not, what names do you
give those one-use variables? Is
there any standard?
The while loop is really only necessary if you are expecting multiple rows to be returned. If you are just getting one row you can simply use mysql_fetch_array().
$query = "SOME SQL";
$result = mysql_query($query);
$row = mysql_fetch_array($result);
For single line returns is the standard I use. Sure it is a little clunky to do this in PHP, but at least you have the process broken down into debug-able steps.
Use PDO:
<?php
/*** mysql hostname ***/
$hostname = 'localhost';
/*** mysql username ***/
$username = 'username';
/*** mysql password ***/
$password = 'password';
try {
$dbh = new PDO("mysql:host=$hostname;dbname=mysql", $username, $password);
$sql = "SELECT * FROM myTable";
$result = $dbh->query($sql)
//Do what you want with an actual dataset
}
catch(PDOException $e) {
echo $e->getMessage();
}
?>
Unless you are legacied into it by an existing codebase. DONT use the mysql extension. Use PDO or Mysqli. PDO being preferred out of the two.
Your example can be come a set of very consise statements with PDO:
// create a connection this could be done in your connection include
$db = new PDO('mysql:host=localhost;dbname=your_db_name', $user, $password);
// for the first or only result
$infoArray = $db->query('SOME SQL')->fetch(PDO::FETCH_ASSOC);
// if you have multiple results and want to get them all at once in an array
$infoArray = $db->query('SOME SQL')->fetchAll(PDO::FETCH_ASSOC);
// if you have multiple results and want to use buffering like you would with mysql_result
$stmt = $db->query('SOME SQL');
foreach($stmt as $result){
// use your result here
}
However you should only use the above when there are now variables in the query. If there are variables they need to be escaped... the easiest way to handle this is with a prepared statement:
$stmt = $db->prepare('SELECT * FROM some_table WHERE id = :id');
$stmt->execute(array(':id' => $id));
// get the first result
$infoArray = $stmt->fetch(PDO::FETCH_ASSOC);
// loop through the data as a buffered result set
while(false !== ($row = $stmt->fetch(PDO::FETCH_ASSOC))){
// do stuff with $row data
}