I have a table tag. In this table there are only 2 fields id & tag. I am using mysqli prepared statement to insert in the database.
Here is the code:
$search='test';
// Do Prepared Query
$result = $mysqli->prepare("SELECT tag FROM tag where tag= ?");
$result ->bind_param("s", $search);
$result->execute();
$result->store_result();
$result->bind_result($search);
while ($result->fetch()) {
$tag = $tag;
}
if($result->num_rows != 1){
echo "Test";
$result1 = $mysqli->prepare("INSERT INTO tag (tag) VALUES (?)");
$result1 ->bind_param("s", $search);
$result1->execute();
$result1->store_result();
if($result1->affected_rows == 1){
//$res['success'] = true;
$data[] = "Added Successfully";
}
}
// return the result in json
echo json_encode($data);
For some reason it is not working. I have added the db.php file.
It is working fine until here if($result->num_rows != 1){ because I echo Test there and I am getting the output.
You have to close your connection properly :
$result->close();
Related
I am trying to get both the results of my query and the row count wihtout having to make two trips the the DB if possible. I am using prepared statements in a procedural way. My code is as follows:
$dbd = mysqli_stmt_init($dbconnection);
if (mysqli_stmt_prepare($dbd, "SELECT * FROM Contacts WHERE First_Name = ?" )) {
mysqli_stmt_bind_param($dbd, "s", $val1);
if (!mysqli_stmt_execute($dbd)) {
echo "Execute Error: " . mysqli_error($dbconnection);
} else {
//do nothing
}
} else {
echo "Prep Error: " . mysqli_error($dbconnection);
}
$result = mysqli_stmt_get_result($dbd);
So the above code works just fine and returns my results. What I want to do now is get the row count using this same statement but i don't want to have to write a brand new prepared statement. If I writer a separate prepared statement and use store_results and num_rows I get the row count but that would force me to have to write an entire new block of code and trip to db. I am trying to do something as follows but It throws and error:
$dbd = mysqli_stmt_init($dbconnection);
if (mysqli_stmt_prepare($dbd, "SELECT * FROM Contacts WHERE First_Name = ?" )) {
mysqli_stmt_bind_param($dbd, "s", $val1);
if (!mysqli_stmt_execute($dbd)) {
echo "Execute Error: " . mysqli_error($dbconnection);
} else {
//do nothing
}
} else {
echo "Prep Error: " . mysqli_error($dbconnection);
}
$result = mysqli_stmt_get_result($dbd);
mysqli_stmt_store_result($dbd);
$rows = mysqli_stmt_num_rows($dbd);
The throws and error as if i can't run both get results and store results using the same prepared statement. Im simply trying to keep my code compact and reuse as much as possible. If i break the above out into two separat prepared statements it works fine, Im just wondering there is a way to just add a line or two to my existing statement and get the row count. Or do i have to write an entire new block of code with new stmt_init, stmt_prepare, bind_param, execute, etc...
I tried your code (and reformatted it a bit), but I can't get it to work when I use both store_result() and get_result(). I can only use store_result then bind_result().
So the alternative is to fetch all the rows and then count them:
Example:
$sql = "SELECT * FROM Contacts WHERE First_Name = ?";
$stmt = mysqli_stmt_init($dbconnection);
if (mysqli_stmt_prepare($stmt, $sql) === false) {
trigger_error("Prep Error: " . mysqli_error($dbconnection));
return 1;
}
if (mysqli_stmt_bind_param($stmt, "s", $val1) === false) {
trigger_error("Bind Error: " . mysqli_stmt_error($stmt));
return 1;
}
if (mysqli_stmt_execute($stmt) === false) {
trigger_error("Execute Error: " . mysqli_stmt_error($stmt));
return 1;
}
$result = mysqli_stmt_get_result($stmt);
$rows = mysqli_fetch_all($result, MYSQLI_ASSOC);
$num_rows = count($rows);
print "$num_rows rows\n";
foreach ($rows as $row) {
print_r($row);
}
In my opinion, PDO is much easier:
$pdo = new PDO("mysql:host=127.0.0.1;dbname=test", "xxxx", "xxxxxxxx");
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$sql = "SELECT * FROM Contacts WHERE First_Name = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$val1]);
$num_rows = $stmt->rowCount();
print "$num_rows rows\n";
while ($row = $stmt->fetch()) {
print_r($row);
}
Am trying to save the result of multiple check-boxes as separate records. my code is not functioning. please help!
<?php
session_start();
$id = $_SESSION['user_id'];
$db = new PDO('mysql:host=localhost;dbname=idp;charset=utf8','root', '');
foreach($_POST['comp'] as $val){
$tmp['user_id'] = $id;
$tmp['comp_id'] = $val;
$vars[] = $tmp;
}
$qry = "INSERT INTO compentency_result (user_id, result) VALUES (:user_id, :comp_id)";
try
{
$sql = $db->prepare($qry);
$numRows = 0;
foreach($vars as $insert){
$numRows += $sql->execute($insert);
}
print("<p>There were {$numRows} inserted into the database!</p>");
}
catch(PDOException $e)
{
print("<p>Oops! There was an issue - this is the message: {$e->getMessage()}</p>");
}
?>
The result is showing me that nothing is added to the database.
To bind the parameters individually you would do this:
try
{
$sql = $db->prepare($qry);
$numRows = 0;
foreach($vars as $insert){
$sql->bindParam(':user_id', $insert['user_id'], PDO::PARAM_STR);
$sql->bindParam(':comp_id', $insert['comp_id'], PDO::PARAM_STR);
$sql->execute();
$numRows += $sql->rowCount(); // get the rows affected this way
}
echo "<p>There were {$numRows} inserted into the database!</p>";
}
In addition, I added a more proper and reliable method of getting the affected rows, using rowCount().
If you don't want to bind the elements individually you can use execute() with an array as shown in Demystifying PDO
I'm new to PHP,I got error in my web page.It said:
Notice: Undefined index: itemid in /home/tz005/public_html/COMP1687/edit.php on line 103
Can I use isset to fix this problem? If yes, how to do so? Here is my script:
<?php
//include database connection
include 'dbconnect.php';
// if the form was submitted/posted, update the item
if($_POST){
//write query
$sql = "UPDATE
item_information
SET
itemtitle = ?,
itemdescription = ?,
date = ?,
WHERE
itemid= ?";
$stmt = $mysqli->prepare($sql);
$stmt->bind_param(
'sssi',
$_POST['itemtitle'],
$_POST['itemdescription'],
$_POST['date'],
$_POST['itemid']
);
// execute the update statement
if($stmt->execute()){
echo "Item was updated.";
// close the prepared statement
$stmt->close();
}else{
die("Unable to update.");
}
}
$sql = "SELECT
itemid, itemtitle, itemdescription, date
FROM
item_information
WHERE
id = \"" . $mysqli->real_escape_string($_GET['itemid']) . "\"
LIMIT
0,1";
// execute the sql query
$result = $mysqli->query( $sql );
//get the result
if ($result = $mysqli->query( $sql )) {
if ($row = $result->fetch_assoc()) {
// $row contains data
}
}
//disconnect from database
$result->free();
$mysqli->close();
?>
change
$mysqli->real_escape_string($_GET['itemid'])
to
$mysqli->real_escape_string($_POST['itemid'])
or use empty() or isset() to check values exist
Yes you can do it with isset() function
Create conditions for it
if(isset($_GET['itemid'])){
//execute your code
}
else{
//header them back to page or show error that itemid not set or something else whatever suits you
}
This question already has an answer here:
$stmt->num_rows returning 0 even after calling store_result
(1 answer)
Closed 9 years ago.
i am just trying to learn prepared statement and i am following the PHP manual to guide me through, i have checked the answers regarding this problem on stackoverflow but, i can't find any solutions, the $stmt->num_rows always ( Return 0 )
there is a post on stackoverflow discussed the problem and they advised to use
$stmt->store_result() just before the $stmt-num_rows, but the $stmt->num_rows return 0
some one please can tell me what i am doing wrong here.... i am just sick of the procedural style coding and i want to enhance my skills with prepared statement
here is the function down below
function get_all()
{
// ** Initializing the Connection
$mysqli = Connect();
$sql = ( ' SELECT * FROM `users` ' );
$stmt = $mysqli->prepare($sql);
$stmt->execute();
$res = $stmt->get_result();
echo $num_count = $stmt->num_rows();
$user = array();
for ($counter = 0; $row = $res->fetch_assoc(); $counter++)
{
$user[$counter] = $row;
}
return $user;
}
// This is the second update
function get_all()
{
// ** Initializing the Connection
$mysqli = Connect();
$sql = ( ' SELECT * FROM `users` ' );
$stmt = $mysqli->prepare($sql);
$stmt->execute();
$res = $stmt->get_result();
echo $num_count = $stmt->num_rows;
$user = array();
while($row = $res->fetch_assoc())
{
$user[] = $row;
}
return $user;
}
// third update
function get_alll()
{
// ** Initializing the Connection
$mysqli = Connect();
// no need to use * character,
// need to write query this way
$sql = ( ' SELECT `id`,`fname`,`lname`,`uname`,`email` FROM `users` ' );
$stmt = $mysqli->prepare($sql);
// here need to use bind param
$stmt->bind_result( $id, $fname, $lname, $uname, $email);
$stmt->execute();
// it's important to store the result
// before using num rows
$res = $stmt->store_result();
echo $num_count = $stmt->num_rows;
//
while($stmt->fetch())
{
echo $fname;
}
}
num_rows is a property, not a method, try with $stmt->num_rows without brackets
This question already has answers here:
Single result from database using mysqli
(6 answers)
Closed 2 years ago.
I have the following code and where if 1 row is found I would like to set the result to $aPrds, how can I do this?
$stmt = $db->prepare("select * from products where id=?");
$stmt->bind_param("s", $_GET['id']);
if($stmt->execute())
{
$stmt->store_result();
echo $stmt->num_rows;
if($stmt->num_rows==1)
{
//SET RETURNED ROW TO aPrds
}
else
{
echo "no results or too many found";
}
}
else
{
echo "sql invalid";
}
I have also tried the following code which has been unsuccessful (returns (null):
$stmt = $db->prepare("select productid, product_name, description from product where productid=?");
$a=1;
$stmt->bind_param("i", $a);
if($stmt->execute()){
$stmt->store_result();
if($stmt->num_rows==1){
$stmt->bind_result($b, $c, $d);
print_r($b);
print_r($c);
print_r($aPrds);
}else{
echo "no result or more than 1 returned";
}
}else{
echo "invalid sql";
}
Please note that I have tested the SQL and it works, also the $db mysqli connection is definitely working.
I think you are looking for the get_result and fetch_assoc methods:
// ....
$result = $stmt->get_result();
$aPrds = $result->fetch_assoc();
// ....
Edit:
Apparently these functions are not yet available (should have tested this, sorry). So this is tested:
function bind_array($stmt, &$row) {
$md = $stmt->result_metadata();
$params = array();
while($field = $md->fetch_field()) {
$params[] = &$row[$field->name];
}
call_user_func_array(array($stmt, 'bind_result'), $params);
}
// ....
if($stmt->execute()) {
bind_array($stmt, $row);
$stmt->fetch();
print_r($row);
// ....
And you second solution should also work if you added $stmt->fetch() after $stmt->bind_result($b, $c, $d);