I am trying to add numbers located in my database. so I tried sum() in SQL but it didn't show the total number. I don't know whats wrong with my code.
This is my code
<?php
session_start();
$email = $_SESSION['login_user'];
$con = mysqli_connect("localhost" , "root" , "" , "db_name");
if (mysqli_connect_errno()) {
echo "failed to connect:" . mysqli_connect_error();
}
$sql = "SELECT SUM(points) FROM points WHERE email='$email '";
$result = mysqli_query($con, $sql);
$row = mysqli_fetch_array($result, MYSQLI_NUM);
echo $row[0]. "total number" ;
mysqli_free_result($result);
mysqli_close($con);
?>
it just shows total number. i don't know what is wrong here
Use as total, and row of 'total' by mysqli_fetch_assoc.
Related
I am new into php and mysql and also on this website. So I hope I do everything good.
I am trying to get the SUM of some values in a column. But I don't see any result of this on the website. I am trying for a week now searched a lot of information and topics but so far no result at all. So I would like to ask a favor to you in the hope someone can see what I do wrong.
This is what I have now.
<?php
$con=mysqli_connect("localhost","user","1234","dbname");
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$res = mysqli_query($con,"SELECT SUM(Bedrag) FROM `Uitdraai` WHERE Datum BETWEEN '2018-01-01' AND '2018-03-01'");
if (FALSE === $res) die("Select sum failed: ".mysqli_error);
$row = mysqli_fetch_row($res);
$sum = $row[0];
mysqli_close($con);
?>
I already tried almost every option also on the following pages but so far no luck. I just get my regular webpage only without the answer.
Get sum of MySQL column in PHP
Single Result From SUM With MySQLi
I will be really thankful!
SELECT SUM(Bedrag) AS value_sum FROM `Uitdraai` WHERE Datum BETWEEN '2018-01-01' AND '2018-03-01;
In the PHP code, try this:
$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();
}
$result = mysqli_query($con,'SELECT SUM(Bedrag) AS value_sum FROM `Uitdraai` WHERE Datum BETWEEN '2018-01-01' AND '2018-03-01');
$row = mysqli_fetch_assoc($result);
$sum = $row['value_sum'];
echo $sum;
Using PDO (mysql_query is depreciated)
$stmt = $handler->prepare("SELECT SUM(Bedrag) AS value_sum FROM `Uitdraai` WHERE Datum BETWEEN '2018-01-01' AND '2018-03-01");
$stmt->execute();
$row = $handler->fetchAll(PDO::FETCH_OBJ);
$sum = $row->value_sum;
echo $sum;
You should know that mysql_connect is depreciated from php 7 or upper. For this you need to use mysqli or pdo for interacting with the server.
you can try below code for getting sum from the database.
$con = new mysqli("localhost", "my_user", "my_password", "my_db");
$sql = "SELECT SUM(Bedrag) AS value_sum FROM Uitdraai WHERE Datum BETWEEN '2018-01-01' AND '2018-03-01'";
$stmt = $con->query($sql);
if($stmt){
$result = $stmt->fetch_assoc();
echo $result['value_sum'];
}
Very basic but as a rookie I am struggling. The echo doesnt show any value, just the text. What am I doing wrong?
Connect.php:
<?php
$connection = mysqli_connect('test.com.mysql', 'test_com_systems', 'systems');
if (!$connection){
die("Database Connection Failed" . mysqli_error($connection));
}
$select_db = mysqli_select_db($connection, 'swaut_com_systems');
if (!$select_db){
die("Database Selection Failed" . mysqli_error($connection));
}
?>
Get.php:
<?php
require('connect.php');
$query2 = "SELECT systemid FROM user WHERE username=test";
$result2 = mysqli_query($connection, $query2);
echo ( 'SystemID: '.$result2);
?>
Assuming you have connected to the database successfully then the query is incorrect. You must wrap all text values in quotes like this
<?php
require('connect.php');
$query2 = "SELECT systemid FROM user WHERE username='test'";
$result2 = mysqli_query($connection, $query2);
Now the mysqli_query submits the query to the database where it is run and a result set built. To see the result set you need to read the result set back from the database using one of the fetch functions for example
$row = mysqli_fetch_assoc($result2);
echo 'SystemID: ' . $row['systemid'];
If there are more than one rows in the result set you must do that in a loop like this
while ($row = mysqli_fetch_assoc($result2)){
echo 'SystemID: ' . $row['systemid'];
}
You are printing the mysqli result object. In order to printthe result you have to use:
$row = mysqli_fetch_assoc($result2);
print_r($row);
You need to collect the results of the mysqli_query using the following:
require('connect.php');
$query2 = "SELECT systemid FROM user WHERE username=test";
$result2 = mysqli_query($connection, $query2);
while ($row = mysqli_fetch_assoc($result2))
{
echo "System ID is: " . $row['systemid'];
}
sorry to bother you all but I'm really struggling with this one:
I connect to my database fine and then I try the following mysql statements:
$query1 = "select row1 from mydatabase where row2 = $Name ";
$answer1 = mysql_query($query1);
However, a few lines later when I try :
echo $answer1;
I'm given only nulls :(
Can anyone give me any suggestions please?
edit:
SQL logins:
mysql_connect("correct", "username", "password");
mysql_select_db("dbname") or die(mysql_error());
everything you did is right you have just to fetch the data like this:
$query1 = "select row1 from mydatabase where row2 = $Name ";
$answer1 = mysql_query($query1);
while($data= mysql_fetch_array($answer1)){
echo $data['row1'];
}
And this is a complet answer, i adjust it as you need ;)
<?php
//Connect to your database
$con=mysqli_connect("db_hostname","db_user","db_password","db_name");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
//Value of the row to select
$row2 = 'some value';
//Make select query
$result = mysqli_query($con, "SELECT row1 FROM MyTable WHERE row2='$row2'");
//Fetch datas
while($row = mysqli_fetch_array($result))
{
echo $row['row1'];
echo "<br>";
}
//Close database
mysqli_close($con);
?>
Good Luck :)
Try using MySQLi_* instead MySQL_* functions and pass the connection variable to the function calls.
If this doesn't work then you might want to try some further debugging by enabling all error reporting and dumping the global scope.
<?php
error_reporting(E_ALL); // Show all errors & warnings
$conn = mysqli_connect("server", "username", "password");
mysqli_select_db($conn, "dbname") or die(mysql_error());
$sql1 = "SELECT `row1` FROM `mydatabase` WHERE `row2` = '".$Name."';";
$query1 = mysqli_query($conn, $sql1);
$answer1 = mysqli_fetch_assoc($query1);
var_dump($GLOBALS); // Dumps all variables in the global scope
?>
add this after $answer1= mysql_query($query1);
while ($row = mysql_fetch_assoc($answer1)) {
// echo data
echo $row['row1'];
}
I can't count my users in the database with my current configurations.
<?php
require_once 'scripts/app_config.php';
mysqli_connect(DATABASE_HOST,DATABASE_USER,DATABASE_PASS,DATABASE_NAME);
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$query = "SELECT COUNT(*) FROM users";
$result = mysql_query($query);
$num = mysql_num_rows($result);
echo "There are: ". $num . " users in the database";
mysqli_close($con);
?>
Your problem is this:
$num = mysql_num_rows($result);
Your query only returns 1 row, so I presume the problem you're having is that it always outputs: There are 1 users in the database.
You should instead use:
$num = mysqli_fetch_array($query)[0];
Either use COUNT(*) OR use mysql_num_rows
$query = "SELECT COUNT(*) FROM users";
$result = mysql_query($query);
$row = mysql_fetch_array($result);
$num = $row[0];
echo "There are: ". $num . " users in the database";
Note : mysql_* function is deprecated, move on mysqli_* function asap.
What is the best MySQL command to count the total number of rows in a table without any conditions applied to it? I'm doing this through php, so maybe there is a php function which does this for me? I don't know. Here is an example of my php:
<?php
$con = mysql_connect("server.com","user","pswd");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("db", $con);
$result = mysql_query("some command");
$row = mysql_fetch_array($result);
mysql_close($con);
?>
<?php
$con = mysql_connect("server.com","user","pswd");
if (!$con) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db("db", $con);
$result = mysql_query("select count(1) FROM table");
$row = mysql_fetch_array($result);
$total = $row[0];
echo "Total rows: " . $total;
mysql_close($con);
?>
Either use COUNT in your MySQL query or do a SELECT * FROM table and do:
$result = mysql_query("SELECT * FROM table");
$rows = mysql_num_rows($result);
echo "There are " . $rows . " rows in my table.";
mysqli_num_rows is used in php 5 and above.
e.g
<?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();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
printf("Result set has %d rows.\n",$rowcount);
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
Use COUNT in a SELECT query.
$result = mysql_query('SELECT COUNT(1) FROM table');
$num_rows = mysql_result($result, 0, 0);
you can do it only in one line as below:
$cnt = mysqli_num_rows(mysql_query("SELECT COUNT(1) FROM TABLE"));
echo $cnt;
use num_rows to get correct count for queries with conditions
$result = $connect->query("select * from table where id='$iid'");
$count=$result->num_rows;
echo "$count";
for PHP 5.3 using PDO
<?php
$staff=$dbh->prepare("SELECT count(*) FROM staff_login");
$staff->execute();
$staffrow = $staff->fetch(PDO::FETCH_NUM);
$staffcount = $staffrow[0];
echo $staffcount;
?>
<?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();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
echo "number of rows: ",$rowcount;
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
it is best way (I think) to get the number of special row in mysql with php.
<?php
$conn=mysqli_connect("127.0.0.1:3306","root","","admin");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="select count('user_id') from login_user";
$result=mysqli_query($conn,$sql);
$row=mysqli_fetch_array($result);
echo "$row[0]";
mysqli_close($conn);
?>
Still having problem visit my tutorial http://www.studentstutorial.com/php/php-count-rows.php
$sql = "select count(column_name) as count from table";
Well, I used the following approach to do the same: I have to get a count of many tables for listing the number of services, projects, etc on the dashboard. I hope it helps.
PHP Code
// create a function 'cnt' which accepts '$tableName' as the parameter.
function cnt($tableName){
global $conection;
$itemCount = mysqli_num_rows(mysqli_query($conection, "SELECT * FROM `$tableName`"));
echo'<h6>'.$itemCount.'</h6>';
}
Then when I need to get the count of items in the table, I call the function like following
<?php
cnt($tableName = 'projects');
?>
In my HTML front end, so it renders the count number
It's to be noted that I create the cnt() function as a global function in a separate file which I include in my head, so I can call it from anywhere in my code.