I have a table in my database named visitor_table . Within table i have a column named visitor_affiliate. I want to get the count of the rows when visitor_affiliate = "someurer" .
I want to get the count as number. I already have this code but i don't know how to get the count only for the rows containing the string. I currently get the number of all rows,
$result = mysql_query("SELECT * FROM visitor_table");
$num_rows = mysql_num_rows($result);
echo "$num_rows Rows\n";
You can ask MySQL to return the count:
SELECT COUNT(*) FROM visitor_table WHERE visitor_affiliate = 'someurer'
You shouldn't be using the ancient (deprecated as of PHP v5.5.0, soon to be removed entirely) MySQL extension for writing new code—use instead the improved MySQLi extension or the PDO abstraction layer, both of which enable you to pass variables to the database in a safe, parameterised, fashion that ensures they are not evaluated for SQL (and therefore prevents SQL injection attacks):
$dbh = new PDO("mysql:dbname=$dbname", $username, $password);
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, FALSE);
$qry = $dbh->prepare('
SELECT COUNT(*) FROM visitor_table WHERE visitor_affiliate = ?
');
$qry->execute(['someurer']);
echo $qry->fetchColumn(), ' rows';
$result = mysql_query("SELECT * FROM visitor_table WHERE `visitor_affiliate` = 'someurer'");
$num_rows = mysql_num_rows($result);
echo $num_rows . " Rows\n";
With what little information you have given just try this-
$result = mysql_query("SELECT * FROM visitor_table Where visitor_affiliate like '%someurer%'");
$num_rows = mysql_num_rows($result);
echo "$num_rows Rows\n";
The deprecated MySQL:
$res = mysql_query('SELECT * FROM visitor_table');
echo 'Number of rows:'.mysql_num_rows($res);
Procedural MySQLi:
$tu = mysqli_prepare($DBH,'SELECT * FROM visitor_table');
mysqli_execute($tu);
$num_rows = mysqli_num_rows($tu);
echo $num_rows.' rows\n';
mysql has been deprecated. Please use mysqli.
Using MySQLi bind_param to get your result:
$someuser = 'Dave';
$DBH = mysqli_connect('localhost','user','pass','database');
$query = mysqli_prepare($DBH,'SELECT * FROM visitor_table WHERE user = ?');
mysqli_bind_param($query,'s',$someuser);
mysqli_execute($query);
mysqli_bind_result($id,$user,$tabCol1,$tabCol2);
while(mysqli_fetch_result){
$row = $row +1;
echo $user.': was found in the record with ID of: '.$id;
}
echo 'total records found:'.$row;
That's one way of doing it as I'm not completely 100% sure about using a mysqli_num_row() with the query above.
Related
I know that inside MySQL, you can use:
SELECT COUNT(*) FROM table
I have written the following code in PHP to display the number of rows on the page:
$sql = 'select * from users';
$data = $conn -> query($sql);
echo $data;
But when I run it, I get the following error:
Catchable fatal error: Object of class PDOStatement could not be converted to string in [Directory] on line 19.
I think the problem is that the returned value is not in string form. If that is correct, how would I be able to display the number of rows on the page?
If you want to count the rows you can do this with PDO:
$sql = 'select * from users';
$data = $conn->query($sql);
$rows = $data->fetchAll();
$num_rows = count($rows);
Well, you arent badly off, you are almost there:
$sql = 'SELECT COUNT(*) as numrow FROM users';
$data = $conn -> query($sql);
rows = $data->fetchAll();
Depending on the type of return data, you could use
$rows->numrow if the return data is an object
There are some easy and faster way to do this
COUNT the column in query and fetch
$sql = "SELECT COUNT(id) AS total_row FROM table_name";
$stmt = $conn->query($sql);
$stmt->execute();
echo $count['total_row'];
Using rowCount()
$sql = "SELECT * FROM table_name";
$stmt = $conn->query($sql);
$stmt->execute();
$count = $stmt->rowCount();
echo $count;
I need to get the number of rows of a studentID and then echo if the count is over 10.
This is what I wrote so far. But doesn't seem to work.
$findID = ID1231275;
$gipct = mysql_query("SELECT COUNT(studentID) FROM classFees WHERE studentID = '".$findID."'");
if ($gipct>10) {
echo ("$gipct");
}
$searchID = 'ID1231275';
$gipct = mysql_query("SELECT COUNT(studentID) as students FROM classFees WHERE studentID = '$searchID'");
$row = mysql_fetch_object($gipct);
if ($row->students >10) {
echo $row->students;
}
Btw, mysql_ functions are deprecated and can/will be removed in future versions of php, I recommend you to look at PDO statements or mysqli_ functions
$gipct is a mysql resource. So you have to use the function mysql_num_rows to get all rows that are selected.
Thats in your case not working because you have a COUNT in your query so you get only one row.
In your case you have to fetch the data first.
$gipct = mysql_query("SELECT COUNT(studentID) AS countout FROM classFees WHERE....");
$row = mysql_fetch_object($gpict);
if ($row->countout > 10) {
echo ("$gipct");
}
Or the method with the mysql_num_rows
$gipct = mysql_query("SELECT * FROM classFees WHERE student...");
if (mysql_num_rows($row) > 10) {
echo ("$gipct");
}
But here you select all records which can be much slower as the first solution.
If you are using php > 5 then you must use mysqli instead of mysql class. Then try this:
$db = new mysqli('localhost','user','pass','database');
$searchID = 'ID1231275';
$stmt = $db->prepare("SELECT COUNT(studentID) FROM classFees WHERE studentID =? ");
$stmt->bind_param('s', $searchID);
$stmt->execute();
$stmt->bind_result($gipct);
$stmt->fetch();
if ($gipct > 10) {
echo ($gipct);
}
I want to search in a database table for a particular word and want to retrieve a text from other column in the same row and there may be more than one rows where that word may exist, so i want all those rows where that word is.
i am using this code
$found = 'world';
$sql = "SELECT file_id FROM hello WHERE $field = '$found'";
$result = mysql_query( $sql);
$row = mysql_fetch_array($result);
while($row)
{
echo $row['file_id'];
}
so my problem here is in database table i have only 5 rows and there are only 2 possible file_id to be printed after the code, but this while loop goes to infinite.
Thanks in advance
The quick fix is this:
$found = 'world';
$sql = "SELECT file_id FROM hello WHERE field = '$found'";
$result = mysql_query( $sql);
while($row = mysql_fetch_array($result)) {
echo $row['file_id'];
}
But there are quire a lot other things to be corrected:
use the mysqli extension, the mysql extension is deprecated
you should use prepared statements to prevent sql injections
you must add error checking and handling
...
if you are starting a project use PDO
$db new PDO('mysql:host=localhost dbname=foo', 'user', 'password');
$sql = 'SELECT file_id FROM hello WHERE field = ? ';
$stmt = $db-prepare($sql);
$stmt->bindValue(1, $word);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
foreach($result as $item){
echo $item['key'];
}
I am trying to view how many rows there are based on a SQL query using PHP.
I seem to be able query the database and return fields from a row but can't seem to find out how many rows there are based on the same query.
<?php
$host = 'localhost';
$user = 'MyUsername';
$pass = 'MyPassword';
$database = 'MyDatabase';
$con=mysqli_connect($host,$user,$pass ,$database);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM MyTable WHERE test='123' AND test2='456'");
$num_rows = mysql_num_rows($result);
echo "$num_rows Rows\n";
mysqli_close($con);
?>
All it returns is the text Rows on the screen, without the number of rows at the start.
Like I said, this same query works and returns a value if I try and select a row using:
while($row = mysqli_fetch_array($result))
{
echo $row["test"];
}
Anyone know why it won't return the number of rows?
You are using MySQLi. Because of you don't have a mysql query, mysql_num_rows doesn't return desired value.
You have to replace your mysql function with mysqli equal:
$num_rows = mysqli_num_rows($result);
You are using Mysqli to you should use mysqli_num_rows
$result = mysqli_query($con,"SELECT * FROM MyTable WHERE test='123' AND test2='456'");
$num_rows = mysqli_num_rows($result);
If you want only count then you can directly use count(*) like this:-
$result = mysqli_query($con,"SELECT COUNT(*) FROM MyTable WHERE test='123' AND test2='456'");
echo $result;
I'll do some thing like this:
$result = mysqli_query($con,"SELECT COUNT(*) FROM MyTable WHERE test='123' AND test2='456'");
echo $result
Is there any way to store mysql result in php variable? thanks
$query = "SELECT username,userid FROM user WHERE username = 'admin' ";
$result=$conn->query($query);
then I want to print selected userid from query.
Of course there is. Check out mysql_query, and mysql_fetch_row if you use MySQL.
Example from PHP manual:
<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
echo 'Could not run query: ' . mysql_error();
exit;
}
$row = mysql_fetch_row($result);
echo $row[0]; // 42
echo $row[1]; // the email value
?>
There are a couple of mysql functions you need to look into.
mysql_query("query string here") : returns a resource
mysql_fetch_array(resource obtained above) : fetches a row and return as an array with numerical and associative(with column name as key) indices. Typically, you need to iterate through the results till expression evaluates to false value. Like the below:
while ($row = mysql_fetch_array($query)){
print_r $row;
}
Consult the manual, the links to which are provided below, they have more options to specify the format in which the array is requested. Like, you could use mysql_fetch_assoc(..) to get the row in an associative array.
Links:
http://php.net/manual/en/function.mysql-query.php
http://php.net/manual/en/function.mysql-fetch-array.php
In your case,
$query = "SELECT username,userid FROM user WHERE username = 'admin' ";
$result=mysql_query($query);
if (!$result){
die("BAD!");
}
if (mysql_num_rows($result)==1){
$row = mysql_fetch_array($result);
echo "user Id: " . $row['userid'];
}
else{
echo "not found!";
}
$query="SELECT * FROM contacts";
$result=mysql_query($query);
I personally use prepared statements.
Why is it important?
Well it's important because of security. It's very easy to do an SQL injection on someone who use variables in the query.
Instead of using this code:
$query = "SELECT username,userid FROM user WHERE username = 'admin' ";
$result=$conn->query($query);
You should use this
$stmt = $this->db->query("SELECT * FROM users WHERE username = ? AND password = ?");
$stmt->bind_param("ss", $username, $password); //You need the variables to do something as well.
$stmt->execute();
Learn more about prepared statements on:
http://php.net/manual/en/mysqli.quickstart.prepared-statements.php MySQLI
http://php.net/manual/en/pdo.prepared-statements.php PDO
$query = "SELECT username, userid FROM user WHERE username = 'admin' ";
$result = $conn->query($query);
if (!$result) {
echo 'Could not run query: ' . mysql_error();
exit;
}
$arrayResult = mysql_fetch_array($result);
//Now you can access $arrayResult like this
$arrayResult['userid']; // output will be userid which will be in database
$arrayResult['username']; // output will be admin
//Note- userid and username will be column name of user table.