PHP MySQL queries return no results
Question
My queries to MySQL via PHP are returning no results. First, I have tried connecting and doing a select on a known table and get no results. I then try to get a listing of the tables and again no results. When I look at the database via phpMyAdmin I can see the tables and their contents. Here is my code. Can anyone offer some help as to what I am doing wrong?
<?php
# /* $ php -f db-connect-test.php */
echo"preparing to connect";
$dbname = '#########';
$dbuser = '#########';
$dbpass = '#########';
$dbhost = 'localhost';
$connect = @mysqli_connect($dbhost, $dbuser, $dbpass, $dbname) or die("Unable to Connect to '$dbhost'");
echo"<html>";
echo"<title>test page</title>";
echo"<body>";
echo"<h2> test page</h2>";
/* check connection */
if ($conn->connect_error) {
die("Connection failed: " . mysqli_connect_error());
}
else{
echo"Successfully Connected <p>";
}
if(mysqli_ping($connection)){
echo "got it<p>";
}
$sql = "SELECT * FROM `announcements`";
$result = mysqli_query($dbname, $sql);
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo 'date: ' . $row['date'] . '\tTitle: ' . $row['title'] . '\tBody: ' . $row['body'] .'<br />';
}
} else {
echo "0 results<p>";
$sql = "SHOW TABLES";
$result = mysqli_query($dbname, $sql);
if (!$result) {
echo "DB Error, could not list tables<p>";
echo 'MySQL Error: ' . mysqli_error();
}
else{
while ($row = mysqli_fetch_row($result)) {
echo "Table: {$row[0]}<p>";
}
}
}
$conn->close();
echo"</body>";
echo"</html>";
?>
Here is the result I am seeing:
preparing to connect
test page
Successfully Connected
0 results
DB Error, could not list tables
MySQL Error:
end of results
For some reason I am unable to get MySQL to return a error message.
2 answers
solution1
1 ACCPTED 2018-07-30 05:45:08
When calling mysqli_query()
mysqli_query($dbname, $sql);
The first parameter is your database link not the name...
mysqli_query($connect, $sql);
Also - don't use @ for your connection (or preferably anywhere) as this suppresses errors.
Update: Also just noticed...
mysqli_ping($connection)
which should be...
mysqli_ping($connect)
solution2
1 2018-07-30 06:04:39
You just have to Copy and Paste this code
You don't have to use $dbname Have to use $connect
<?php
# /* $ php -f db-connect-test.php */
echo"preparing to connect";
$dbname = '#########';
$dbuser = '#########';
$dbpass = '#########';
$dbhost = 'localhost';
$connect = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname) or die("Unable to Connect to '$dbhost'");
echo"<html>";
echo"<title>test page</title>";
echo"<body>";
echo"<h2> test page</h2>";
/* check connection */
if ($conn->connect_error) {
die("Connection failed: " . mysqli_connect_error());
}
else{
echo"Successfully Connected <p>";
}
if(mysqli_ping($connection)){
echo "got it<p>";
}
$sql = "SELECT * FROM `announcements`";
$result = mysqli_query($connect, $sql);
if (mysqli_num_rows($result) > 0) {
// output data of each row
while($row = mysqli_fetch_assoc($result)) {
echo 'date: ' . $row['date'] . '\tTitle: ' . $row['title'] . '\tBody: ' . $row['body'] .'<br />';
}
} else {
echo "0 results<p>";
$sql = "SHOW TABLES";
$result = mysqli_query($connect, $sql);
if (!$result) {
echo "DB Error, could not list tables<p>";
echo 'MySQL Error: ' . mysqli_error();
}
else{
while ($row = mysqli_fetch_row($result)) {
echo "Table: {$row[0]}<p>";
}
}
}
$conn->close();
echo"</body>";
echo"</html>";
?>
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