I am trying to do a simple SELECT to return rows of data from my database. I have a valid connection from my database so I know the issue is not there. I have ensured the names of each column are correct but it just returns 0 results.
My table inside the db is called 'user' and here is the members.php file:
<?php include 'header.php'; ?> <- this is where the db conect file is pulled in.
<?php
$sql = "SELECT id, username, email_address FROM user";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo
$row["id"];
}
} else {
echo "0 Members";
}
$conn->close();
?>
Just for ref here is my DB connection (Not the most secure i am just testing):
<?php
$servername = "localhost";
$username = "***********";
$password = "**********";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully<br><br>";
?>
you didnt select your database
$conn=new mysqli($servername, $username, $password);
this require another parameter which is your d.b name
$conn=new mysqli($servername, $username, $password,$db_name);
Related
I'm just starting PHP and keep returning null for my SQL query. I am successfully connected to the database and have copied and pasted the query even straight from the database.
<?php
$servername = "localhost";
$username = "username";
$password = "";
$dbname = "customerbasics";
$conn = new mysqli($servername, $username, $password);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM `orders`";
$result = $conn->query($sql);
if ($result == NULL){
echo 'No results';
};
if ($result->num_rows > 0) {
echo 'Rows returned';
}
} else {
echo "0 results";
}
$conn->close();
?>
This is what the browswer prints:
Update: Error checking added:
Fatal error: Uncaught mysqli_sql_exception: No database selected
Add the fourth parameter to your connection function
$conn = new mysqli($servername, $username, $password, $dbname);
You have forgotten the database name in your connection. For more information, you can go here. Plus I recommend you to learn PDO or prepared statements
First, you have to select database before executing a query:
mysqli_select_db($conn, $dbname);
Then execute your query:
$sql = "SELECT * FROM `orders`";
Other way, you can also specify database name directly every executing a query:
$sql = "SELECT * FROM $dbname.`orders`";
I am trying to select data from a database. I do have a successful connection, but it seems like the query doesn't work even though I know for sure that the query is right. What am I doing wrong?
If I execute the code below, the result I get is: "Connected successfullyBad query". The 'Bad query' should mean that the query is wrong, but I checked it and it isn't wrong...
<?php
$servername = "localhost";
$username = "root";
$password = "usbw";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
$sql ="SELECT * FROM `producten`";
$result = mysqli_query($conn, $sql) or die("Bad query");
$conn->close();
?>
I expect to only see "connected successfully"
You are missing your database name. You can do it two ways, or in the connect statement:
$conn = new mysqli($servername, $username, $password,$database);
Or you can do it in your select statement:
$sql ="SELECT * FROM `yourdatabase`.`producten`";
If you don´t set your database your query is wrong
Your query is right just write your database name in mysqli constructor.
$conn = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
Visit: https://www.php.net/manual/en/mysqli.construct.php
Please give database name also, check below code.
<?php
$servername = "localhost";
$username = "root";
$password = "usbw";
$dbname = ""; //Enter database name
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
$sql ="SELECT * FROM `producten`";
$result = mysqli_query($conn, $sql) or die("Bad query");
$conn->close();
?>
After I add a column to my database, I want to retrieve it but not expected.
In PHP, I try reopening apache and mysql still not work.
Does anyone know how to resolve it? Thanks!
your question is not fully explanatory but with what I could try to understand you want to retrieve data or records from your database
you could try the code below and tweak it to work your way
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT * FROM databaseName";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data
while($row = $result->fetch_assoc()) {
print $row"<br>";
}
} else {
echo "0 results";
}
$conn->close();
?>
So im trying to to post some data from database in wordpress ,i conect to the database normaly but it wont get any data from it. I have no idea what am i doing wrong.Here is the code
<?php
$servername = "localhost";
$username = "root";
$password = "root123";
$dbname = "MyDB";
$conn = new mysqli($servername, $username, $password);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully"."</br>";
$sql = "SELECT event_name FROM wp_em_events";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "Name :".$row["event_name"];
}
} else {
echo "0 results";
}
$conn->close();
?>
You're missing the database name from your connection.
Change this:
$conn = new mysqli($servername, $username, $password);
to
$conn = new mysqli($servername, $username, $password, $dbname);
It looks like you've connected to the Database correctly, but you've not specified what table to use. The line:
$conn = new mysqli($servername, $username, $password);
Should be:
$conn = new mysqli($servername, $username, $password, $tablename);
I have just set-up LAMP and am trying to query a mysql database and write the results on screen. The issue I have is that instead of writing the results of my query onscreen, my syntax is written on screen instead?
What is the proper way of querying a mysql database with php and writing the results on screen?
This is my syntax that does not work?
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}
$sql = "Select state from PHPTests.state";
$result = $conn->query($sql);
if ($result->num_rows > 0)
{
while($row = $result->fetch_assoc())
{
echo $row['state'];
}
}
else
{
echo "0 results";
}
$conn->close();
?>
<html>
<body>
<h4>Hello - This is test site with php</h4>
</body>
</html>