I'm trying to learn php and I can't read any data from my database!. I know the connection to the server is live and working but this line seem to be giving me problems.
$result = $conn->query($sql);
Where $sql = "SELECT firstName, middleName, lastName FROM Base";
I'm not sure what the problem is but any hints or answer are appreciated .
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h1>My first PHP page</h1>
<?php
// connect to database
$user_name = "superUser";
$password = "";
$database = "Base"$server = "127.0.0.5";
// open connection to the server
$conn = new mysqli($server, $user_name, $password);
// echo "Connection to the server is open";
// check connetion
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
else {
print "Connection to the server is open";
}
// load the data from the table
$sql = "SELECT firstName, middleName, lastName FROM Base";
// echo $conn->server_info;
$result = $conn->query($sql);
if ($result) {
echo "Table was found";
}
else echo "no";
/*while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br />";
}
print $result["firstName"];// ": Number of Rows!" ;*/
// if ($result->num_rows > 0) {
// output data of each row
// close server connection
$conn->close();
?>
</body>
</html>
The following is a mysqli connect example.
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>
You forgot to add your database name.
Change this,
$conn = new mysqli($server, $user_name, $password);
to this
$conn = new mysqli($server, $user_name, $password, $database);
Related
The below code I got from the w3 schools website and adapted it a little to my db but no matter what when I click on my search button I only get the first line printed and nothing else. It doesn't even print if the connection to my db is successfully made or not.
I used chrome's dev tool to check my network traffic and I can see my POST request made successfully:
name: bahamas
submit: Search
I enabled logging for both error and general on my mysql instance, and did a grep for bahamas and got no hits. So this would seem to indicate that the script didn't even query my db?
IE this is what I get: https://imgur.com/a/PHKBmbU
<?php echo("PHP Search Page Loaded Successfully");
if(isset($_POST['submit'])){
if(preg_match("^/[A-Za-z]+/", $_POST['name'])){
$servername = "localhost";
$username = "test";
$password = "test";
$dbname = "test";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
} else {
echo("We are not dead");
}
$sql = "SELECT boatname, date, price FROM liveaboards";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo("<br> boatname: ". $row["boatname"]. " - date: ". $row["date"]. " " . $row["price"] . "<br>");
}
} else {
echo(" 0 results");
}
$conn->close();
}
}else{
echo("<p>Please enter a search query</p>");
}
?>
In following the theme of W3 Schools (one of my favorite resources), here is the correct way to sanitize data: https://www.w3schools.com/php/php_filter.asp
Applied to your code:
<?php echo("PHP Search Page Loaded Successfully");
// test variables.
$_POST['submit'] = true;
$_POST['name'] = "bahamas";
if(isset($_POST['submit'])){
$_POST['name'] = filter_var($_POST['name'], FILTER_SANITIZE_STRING);
$servername = "localhost";
$username = "test";
$password = "test";
$dbname = "test";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
} else {
echo("We are not dead");
}
$sql = "SELECT boatname, date, price FROM liveaboards";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo("<br> boatname: ". $row["boatname"]. " - date: ". $row["date"]. " " . $row["price"] . "<br>");
}
} else {
echo(" 0 results");
}
$conn->close();
}else{
echo("<p>Please enter a search query</p>");
}
?>
According to your POST result, you are receiving name: bahamas submit: Search , if so then Correct this
if(isset($_POST['submit'])){
TO
if(isset($_POST['Search'])){
while executing query got this error "Error updating record: You have an error in your SQL syntax"
$conn = new mysqli($servername, $username, $password, $dbname);
$sql = "SET #a:=0;UPDATE registrations SET EXIBIT_NO=#a:=#a+1 ORDER BY GR_ID";
You can wrtie:
$result=mysqli_query($conn,$sql);
Code Example:
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
}
} else {
echo "0 results";
}
mysqli_close($conn);
?>
I need to delete a data on database by using PHP code, i have written the code but there is some error message.
here is the php code(del.php):-
<!DOCTYPE html>
<html>
<body>
<?php
$conn = mysql_connect('localhost', 'root','');
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "DELETE FROM register WHERE name='' ";
if ($conn->query($sql) === TRUE)
{
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
$conn->close();
?>
</body>
</html>
The database name is 'selva' and the table name is 'register', in database the file names are "Name,Email,Contact,Address", i need to delete the name or email or contact . how to delete!!
//this will delete the whole row:
<!DOCTYPE html>
<html>
<body>
<?php
$servername = "localhost";
$username = "root";
$password = "your_password"; // add your pw from the here
$dbname = "selva";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
//this will delete the whole row
$sql = "DELETE FROM register WHERE 1 ";
if ($conn->query($sql) === TRUE)
{
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
$conn->close();
?>
</body>
</html>
//this will delete only the COLUMNS you set here:
<!DOCTYPE html>
<html>
<body>
<?php
$servername = "localhost";
$username = "root";
$password = "your_password"; // add your pw from the here
$dbname = "selva";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "ALTER TABLE register DROP Name, DROP Email; DROP Contact; ";
if ($conn->query($sql) === TRUE)
{
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
$conn->close();
?>
</body>
</html>
hope it will help you :)
Unable to select student: Access denied for user ''#'localhost' to
database 'student'
Error when tried to run the following codes.
none of the method described here works this is the code i've used
<?php
$servername = "localhost";
$username = "amal";
$password = "ZtFnzcDQB5K9hutM";
$dbname = "student";
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
if (!mysql_select_db("student")) {
echo "Unable to select student: " . mysql_error();
exit;
}
$sql = "SELECT id as Name, Course, DOB, Gender FROM application WHERE userstatus = 1";
$result = mysql_query($sql);
if (!$result) {
echo "Could not successfully run query ($sql) from DB: " . mysql_error();
exit;
}
if (mysql_num_rows($result) == 0) {
echo "No rows found, nothing to print so am exiting";
exit;
}
while ($row = mysql_fetch_assoc($result)) {
echo $row["id"];
echo " ";
echo $row["Name"];
echo " ";
echo $row["Course"];
echo " ";
echo $row["DOB"];
echo " ";
echo $row["Gender"];
echo "<br><br>";
}
mysql_free_result($result);
$conn->close();
?>
Try this something like this :
<?php
$servername = "localhost";
$username = "amal";
$password = "ZtFnzcDQB5K9hutM";
$dbname = "student";
$conn = new mysqli($servername, $username, $password,$dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
if (!mysqli_select_db("student")) {
trigger_error('Database connection failed : ' .$conn->connect_error , E_USER_ERROR);
exit;
}
?>
You used both mysqli and mysql function. Use any one of then it will solve.
i am new to PHP, and i am attempting to create a simple connection from html to mySQL using php. I met with some problems when running my codes.
this is my code:
<?php
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "database";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT username FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "<br> id: ". $row["userid"]. ;
}
} else {
echo "0 results";
}
$conn->close();
?>
after running on a browser, this is displayed:
connect_error) { die("Connection failed: " . $conn->connect_error); } $sql = "SELECT username FROM users"; $result = $conn->query($sql); if ($result->num_rows > 0) { // output data of each row while($row = $result->fetch_assoc()) { echo "
id: ". $row["userid"]. ; } } else { echo "0 results"; } $conn->close(); ?>
Do you have mysql running on your localhost machine? You must verify that it is working first before you can connect via php. Also, make sure you have TCP/IP sockets open in mysql and to make sure it isn't just listening via unix sockets.
echo "<br> id: ". $row["userid"]. ;
this is a syntax error, no need to end it with a full stop.also the correct syntax to connect to sql server is
mysqli_connect("localhost","my_user","my_password","my_db") or die("");
Debug the code before posting it here.
maybe try testing it with a try catch statement. Its what I've done. this way you can display your error messages a little more nicely. As for the cause, PressingOnAlways is probably right
If you are using wampserver or any other server you need to put your php files into c:\wamp\www folder and run them in browser by typing localhost/nameofyourfile.php (change c:\wapm\www for your server installation path or type)
you have the syntax error in blow line
echo "<br> id: ". $row["userid"]. ;
. (dot) should not be there.
second you fetch usernamestrong text by following query
$sql = "SELECT username FROM users";
but you try to get userid
echo "<br> id: ". $row["userid"]. ;
try below code.
<?php
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "databasename";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT usersname FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "<br> id: ". $row["usersname"] ;
}
} else {
echo "0 results";
}
$conn->close();
?>