I am trying to query my database using php, to then display the results of the query. For this example, I only want the number of elements in my MySQL database.
My code is:
<?php
print("This is just a test");
print("This is another test");
// Create connection
$con=mysqli_connect("mysql.netsons.com","****","****","****");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
print("A third test");
$result = mysqli_query($con, "SELECT COUNT(*) FROM MyGames");
echo $result;
echo mysqli_fetch_array($result);
print("A forth test");
mysqli_close($con);
?>
This is the result:
This is just a testThis is another testA third test
What am I doing wrong?
mysql_fetch_array
fetches ... an array.
$row = mysqli_fetch_array($result);
echo $row["COUNT(*)"];
I think it would be better to alias that column too:
SELECT COUNT(*) AS count FROM MyGames
...
echo $row['count'];
I would recomend using a diferent method of querying that is much safer(As far as I know there is no SQL Injection to worry about) and it saves a lot of time and space.
First you need to create an mysqli object
$stateConnect = new mysqli("localhost", "root", "PASS", "DBTable");
This does the same thing as mysqli_connect
and mysqli_select_db
Then you want to define your SQL query
$sql = "SELECT `userVotes` FROM `users` WHERE `userEmail`=?";
Next you want to create a variable called a statement with your SQL "attached to it"
$statement = $stateConnect->prepare($sql);
Notice how in my SQL I didn't directly put the value required for userEmail, instead I put an '?'. This acts as a variable that we will later define(However it will always be a '?'
To define this variable we need to use.
$statement->bind_param('s', $SESSION['email']);
This binds $SESSION['email']
to the first qustion mark, the s
is saying that the first question mark will be a string. Lets say we had to varribles:
$sql = "SELECT `userVotes` FROM `users` WHERE `userEmail`=? AND `userName`=?";
We would then use:
$statement->bind_param('ss', $SESSION['email'], "USERNAME");
Each s replresents a question mark and each value after that represents a question mark.
Now we have to execute our query with.
$statement->execute();
If we are expecting a result to be returned then we have to use
$statement->bind_result($userVotesText);
To bind the results to a variable, If I was expecting to columns of results I would need to put a second variable in.
Now to set those varribles we need to use
if($statement->fetch()){
$userVotesResult = userVotesText;
}
This method is much better than other for querying databases and is called Prepared Statement
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