I have a connection where i want to get some data from my database.
I have inserted some data but now i want to retreive it but i get NULL.
I have no idea why.
<?php
require "connect.php";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM tbltemperature ORDER BY time DESC LIMIT 1";
$result = $conn->query($sql);
var_dump($results);
$t = 0;
while($row = $result->fetch_assoc()) {
$weather[] = array(
$row["time"],
$row["inside_temperature"]
);
echo $row["time"];
echo $row["inside_temperature"];
}
$conn->close();
?>
check var_dump($results); , it looks like it should be var_dump($result);
otherwise you should check $result->num_rows() first to know if there is any row available.
Firstly you have to check your query in phpmyadmin query is working or not. If working you should try to var_dump($result); and after
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "<br> time: ". $row["time"]. " - inside_temperature: ". $row["inside_temperature"]."<br>";
}
} else {
echo "0 results";
}
Related
I have been working with this script for a while and I do not understand why it is giving me no results when the username and password exist. I have checked the capitalization and everything. I have attempted to edit my script to work with this link but alas no results. Here is a screenshot of the database user:. Thanks for your help!
$sql = "SELECT Status FROM Users WHERE Username = '".$_GET["username"]."' AND Password = '".$_GET["password"]."'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row or remove while loop if you wish
while($row = $result->fetch_assoc()) {
echo $row['Status'] ;
}
} else {
echo "0 results";
}
$conn->close();
Edit: I also tried this code, which gave me the error "Getting property of non-object on line 16 (which here is line 9):
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT Status FROM Users WHERE Username = '".$_GET["username"]." AND Password = '".$_GET["password"]."'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row or remove while loop if you wish
while($row = $result->fetch_assoc()) {
echo $row['Status'] ;
}
} else {
echo "0 results";
}
$conn->close();
?>
Edit: I did fix my SQL injections problem, thanks for the advice!
I tried your code as followed, Its working on my machine. Can you make sure of the $conn object creation. Also please enable the errors if not to see whats going wrong.
$conn = new mysqli('localhost','user','password','db');
$sql = "SELECT Status FROM Users WHERE Username = '".$_GET["username"]."'
AND Password = '".$_GET["password"]."'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row or remove while loop if you wish
while($row = $result->fetch_assoc()) {
echo $row['Status'] ;
}
} else {
echo "0 results";
}
$conn->close();
I'm having some troubles with fetching some database information with my php code.
All I'm getting is this message: "Connected successfully0 results".
Here's my code guys, thanks for the help in advance.
<?php
$servername = "example";
$username = "example1";
$password = "example2";
$row = array();
$conn = new mysqli($servername,$username,$password);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
$sql = "Select Distinct subject from mobile_math_science_toc";
$result = mysqli_query($conn, $sql);
if ($result = $conn->query($sql)) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo "Subject " ,$row["subject"];
}
} else {
echo "0 results ";
}
mysqli_close($conn);
?>
You should add dbname while creating your connection to database. You can use mysqli_num_rows function to count no. of rows.
<?php
$servername = "example";
$username = "example1";
$password = "example2";
$dbname = "your_db_name"; // Specify your db-name here.
$conn = new mysqli($servername,$username,$password,$dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
$sql = "Select Distinct subject from mobile_math_science_toc";
$result = mysqli_query($conn, $sql);
// Checking if there are some records available.
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo "Subject " ,$row["subject"];
}
} else {
echo "0 results ";
}
mysqli_close($conn);
?>
Change
$conn = new mysqli($servername,$username,$password);
To
$conn = new mysqli($servername,$username,$password, "<your database name>");
And
$result = mysqli_query($conn, $sql);
if ($result = $conn->query($sql)) {
}
To
$result = $conn->query($sql);
if ($result) {
}
Try
if (mysqli_num_rows($result) > 0) {
While checking you got the data or not
I'm trying to connect $countries to an array that will display all the data from my database, it only displays the last data I entered.Is there anyway I can display all of them?
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT product_id, product_name , quantity FROM inventory";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$tom = array(" ". $row["quantity"] . $row["product_name"]);
$countries = $tom;
}
} else {
echo "0 results";
}
$conn->close();
because you have assinged data to $countries with wrong manner:
$countries = array();
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$tom = array(" ". $row["quantity"] . $row["product_name"]);
$countries[] = $tom; // use []
}
} else {
echo "0 results";
}
$countries[] = $tom;
With [] at the end of inicialization of variable you add a row to that array. If you do it without [], it's just inicialization every time in while loop.
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT product_id, product_name , quantity FROM inventory";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc())
$countries[] = " ". $row["quantity"] . $row["product_name"];
} else {
echo "0 results";
}
$conn->close();
// create connection
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$conn = new mysqli($servername, $username, $password, $dbname);
// get the data
$sql = "SELECT product_id, product_name, quantity FROM inventory";
$countries = $conn->query($sql)->fetch_all();
Although it's only available with mysqlnd installations, you need one, because without mysqlnd mysqli is unusable anyway.
Ok, so it seems like my SELECT count query doesn't work here:
<?php
$servername = " ";
$username = " ";
$password = " ";
$dbname = " ";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
if (isset($_POST['submitted1'])) {
$result= mysqli_query("SELECT COUNT (Motspillerid)
FROM SESSION
WHERE Motspillerid= 3 ");
echo $result ;
} else {
echo "Wrong" ;
}
?>
And when I press submitt nothing happens, I don't get any error message and I don't get the result. So it's something wrong with the SELECT query I guess.
I'm noob I know, I'm new to this.
:)
You're not calling mysqli_query() correctly, the first argument has to be the database connection object returned by mysqli_connect.
And after performing the query, you have to fetch the results using one of the mysqli_fetch_X() functions.
if (isset($_POST['submitted1'])) {
$result= mysqli_query($conn, "SELECT COUNT(*) AS count
FROM SESSION
WHERE Motspillerid= 3 ");
$row = mysqli_fetch_assoc($result);
echo $row['count'];
} else {
echo "Wrong" ;
}
I am trying to query data from a table using the following script:
//connect file
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
//connect file included above - ECHO tested and it is connected as $conn
$sql = "SELECT * FROM userInfo";
$results = $conn->query($sql);
if (!$results) {
printf("Errormessage: %s\n", $conn->error);
exit;
} else {
echo $row['username'];
}
UPDATE --
It now no longer tries to throw an error and seems to go to the else section; however, no echo - and the spelling is correct this time and the column is filled.
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo $row["username"];
}
} else {
echo "0 results";
}
This now returns results. Thank you #Fred -ii- especially for your help on this.
Also thanks #jjczopek for the error checking advice!