Execute Multiple Queries in PHP with NULL as an Input Parameter - php

Question

EDIT (2011-07-23)
Have gotten some very helpful answers, both of which I've tried implementing. But I can't seem to get back the id from my Get_Security statement. I'm pretty sure my problem is that, in my first call statement Get_Security, the last three parameters are set to NULL. Seems like other people have the same problem. Doesn't seem like there's much documentation on having NULL as an input. How does one go about this?
NEW CODE
$stmt = mysqli_stmt_init($link);
$sql = "CALL Get_Security('$symbol', '$tagName', NULL, NULL, NULL)";
if (!mysqli_stmt_prepare($stmt, $sql)){
$error = 'Failed to prepare statement. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
while ($row = mysqli_fetch_assoc($result)) {
$id = $row['id'];
}
mysqli_stmt_close($stmt);
mysqli_close($link);
include $_SERVER['DOCUMENT_ROOT'] . 'mypath-to-database-link'; //this gets $link
$stmt = mysqli_stmt_init($link);
$sql = "CALL Add_Active('$id','Research')";
if (!mysqli_stmt_prepare($stmt, $sql)){
$error = 'Failed to prepare statement Add_Active. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}
mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($link);
include $_SERVER['DOCUMENT_ROOT'] . 'mypath-to-database-link'; //this gets $link
$sql = "INSERT INTO MyTable SET
id='$id',
open_items='$openItems',
attachments='$attachments'
";
$stmt = mysqli_stmt_init($link);
if (!mysqli_stmt_prepare($stmt, $sql)){
$error = 'Failed to INSERT INTO Research_Security. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}
mysqli_stmt_execute($stmt);
mysqli_stmt_close($stmt);
mysqli_close($link);
ORIGINAL ENTRY
Searched extensively (e.g. PHP Manual, SO questions) but answers are confusing.
I need to execute 3 of SQL statements in a row:
Call stored procedure Get_Security that takes some inputs and returns an array, including the id.
Call another stored procedure Add_Active that takes the returned id from Get_Security as an input.
Insert some variables into my table.
Problem: I'm getting the MySQL Error Number 2014: "Commands out of sync; you can't run this command now".
I know I have to use mysqli_stmt_prepare, mysqli_stmt_execute, and mysqli_stmt_close to resolve this, but it's very confusing how to do this.
Would very much appreciate help in how to translate this using the above functions.
CODE:
$sql = "CALL Get_Security('$symbol', '$tagName', NULL, NULL, NULL)";
$result = mysqli_query($link, $sql);
if (!$result){
$error = 'Error calling stored procedure Get_Security.';
include '../error.html.php';
exit();
}
while($row = mysqli_fetch_array($result)){
$tags[] = array('id' => $row['id']);
}
foreach ($tags as $tag){
$id = $tag['id'];
}
$sql = "CALL Add_Active('$id','Research')";
$result = mysqli_query($link, $sql);
if (!$result){
$error = 'Error calling stored procedure Add_Active. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}
$sql = "INSERT INTO MyTable SET
id='$id',
open_items='$openItems',
attachments='$attachments'
";
if (!mysqli_query($link, $sql)){
$error = 'Error adding submitted tag into Research_Security. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}

Answer 1

I hope this helps. From what I can tell you aren't doing anything too fancy, so this should suffice. PDO does also support IN/OUT params to stored procedures as well, but I didn't see you using them.
Please note, PDO handles errors in different ways depending on how it is initialized. So I've skipped error handling here. Please let me know if you have questions.
Also note that until you add a DSN (MySQL's for example) this code doesn't care what database type it is, so the DSN can be a config value making your code more portable. I'm sure you could also see how this code could easily be expanded into a class/model structure (specifically the security check SP could become a PHP method)
$db = new PDO(); // http://www.php.net/manual/en/pdo.construct.php for params
// These generate PDO_Statement (see: http://www.php.net/manual/en/class.pdostatement.php)
$securityStmt = $db->prepare("CALL Get_Security( ?, ?, ?, ?, ? )");
$addActiveStmt = $db->prepare("CALL Add_Active( ?, ? )");
$insertStmt = $db->prepare("INSERT INTO MyTable SET id=?, open_items=?, attachments=?");
// Security CALL
$securityStmt->bindParam( 1, $symbol, PDO::PARAM_STR );
$securityStmt->bindParam( 2, $tagName, PDO::PARAM_STR );
$securityStmt->bindParam( 3, NULL, PDO::PARAM_NULL );
$securityStmt->bindParam( 4, NULL, PDO::PARAM_NULL );
$securityStmt->bindParam( 5, NULL, PDO::PARAM_NULL );
$securityStmt->execute();
// Bind the ID to a variable is useful sometimes...
$securityStmt->bindColumn( 'id', $securityId );
$securityStmt->fetch( PDO::FETCH_BOUND );
/*
Insert + Active call
These are much simpler because we don't need to set the data types of the input
(they are all string I hope...you didn't mention what the last 2 were in the insert).
*/
$addActiveStmt->execute(
array(
$securityId,
'Wedge Research'
)
);
$insertStmt->execute(
array(
$securityId,
$openItems,
$attachments
)
);

Answer 2

$stmt = mysqli_stmt_init($link);
mysqli_stmt_prepare($stmt, "CALL SOMETHING()");
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
while ($row = mysqli_fetch_assoc($result)) {
print_r($row);
}
mysqli_stmt_close($stmt);

Answer 3

So I've figured out how to solve this with my original code by simply closing the link to the database after every query. I would love to do prepared statements instead, but at least this works.
include $_SERVER['DOCUMENT_ROOT'] . 'path-to-connecting-to-db'; //get $link here
$sql = "CALL Get_Security('$symbol', '$tagName', NULL, NULL, NULL)";
$result = mysqli_query($link, $sql);
if (!$result){
$error = 'Error calling stored procedure Get_Security.';
include '../error.html.php';
exit();
}
while($row = mysqli_fetch_array($result)){
$tags[] = array('id' => $row['id']);
}
foreach ($tags as $tag){
$id = $tag['id'];
}
mysqli_close($link);
include $_SERVER['DOCUMENT_ROOT'] . 'path-to-connecting-to-db'; //get $link here
$sql = "CALL Add_Active('$id','Research')";
$result = mysqli_query($link, $sql);
if (!$result){
$error = 'Error calling stored procedure Add_Active. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}
mysqli_close($link);
include $_SERVER['DOCUMENT_ROOT'] . 'path-to-connecting-to-db'; //get $link here
$sql = "INSERT INTO myTable SET
id='$id',
open_items='$openItems',
attachments='$attachments'
";
if (!mysqli_query($link, $sql)){
$error = 'Error adding submitted tag into Research_Security. Error No: ' . mysqli_errno($link) . ': ' . mysqli_error($link);
include '../error.html.php';
exit();
}