I'm trying to display how many id's does my procedure finds, but the variable $processz only got the first row of the sql result. It should display that there are 17 rows or id's, and only got 1. Why does it happends?
$conexion = con_abrir();
$sqlquery = "OEE.dbo.VerPlanillas_fechas '$Linea_ID','$fecha1','$fecha2'";
$processz = odbc_exec($conexion,$sqlquery);
con_cerrar($conexion);
$res = count($processz);
echo $res;
count ($processz) tells you how many results you have - one.
If you want to know how many rows are in the result, you need to call odbc_num_rows ($processz);
Look into using PDO rather than odbc specific functions.
Related
I am trying to figure out how to delete all ids in the database that do not exist in an array. I have been trying to use NOT IN in my query but I am not sure why it wont work when running it in a script the same way it works when I manually enter it into mysql. Here is an example.
mysqli_query($con, "DELETE FROM table WHERE id NOT IN ($array)");
$array is a list of ids from a json api. I use CURL to fetch the ids and I am trying to delete all ids in the database that do not match the ids in $array.
First I use another simple CURL script to scrape the apis and insert the ids found into the database and what I am trying to do here is basically make a link/data checker.
If the ids in the database are not found in the array when rechecking them then I want them deleted.
I thought that the query above would work perfect but for some reason it doesn't. When the query is ran from a script the mysql log shows the queries being ran as this.
Example:
DELETE FROM table WHERE id NOT IN ('166')
or this when I am testing multiple values.
DELETE FROM table WHERE id NOT IN ('166', '253', '3324')
And what happens is it deletes every row in the table every time. I don't really understand because if I copy/paste the same query from the log and run it manually myself it works perfect.
I have been trying various ways of capturing the array data such as array_column, array_map, array_search and various functions I have found but the end result is always the same.
For right now, just for testing I am using these 2 bits of code for testing 2 different apis which gives me the same sql query log output as above. The functions used are just a couple random ones that I found.
//$result is the result from CURL using json_decode
function implode_r($g, $p) {
return is_array($p) ?
implode($g, array_map(__FUNCTION__, array_fill(0, count($p), $g), $p)) :
$p;
}
foreach ($result['data'] as $info){
$ids = implode_r(',', $info['id']);
mysqli_query($con, "DELETE FROM table WHERE id NOT IN ($ids)");
}
And
$arrayLength = count($result);
for($i = 0; $i < $arrayLength; $i++) {
mysqli_query($con, "DELETE FROM table WHERE id NOT IN ('".$result[$i]['id']."')");
}
If anyone knows what is going on i'd appretiate the help or any suggestions on how to achieve the same result. I am using php 7 and mysql 5.7 with innodb tables if that helps.
It probably doesn't work because your IN value is something like this
IN('1,2,3,4');
When what you want is this
IN('1','2','3','4')
OR
IN( 1,2,3,4)
To get this with implode include the quotes like this
$in = "'".implode("','", $array)."'";
NOTE whenever directly inputting variables into SQL there is security Implications to consider such as SQLInjection. if the ID's are from a canned source you're probably ok, but I like to sanitize them anyway.
You can't mix array and string.
This works:
mysqli_query($con, "DELETE FROM table WHERE id NOT IN (".implode(',', $ids).")");
I have quite an issue I can not seem to solve. I am trying to get a row count from a select statement.
I should start by saying I have tried most all methods resulting from google searches on this issue.
I am using the result set so I would prefer not to make a second query.
The query uses a prepared select statement which seems to be a main issue if I understand it correctly.
I decided to try a simple approach using PHP's native count() function. Which lead me here because I finally reached the end of the rope on this.
On to the details...within a class of mine, I make the query like this.
// Create database connection
$database = DatabaseFactory::getFactory()->getConnection();
// Set and execute database query
$sql = "SELECT * FROM `service_orders` WHERE `agency_id` = :agency_id $filter ORDER BY $sort $order $per_page";
$query = $database->prepare($sql);
$query->execute($query_array);
// If results
if ($query->rowCount() > 0) {
$results = $query->fetchAll();
self::$order_count = "Count: " . count($results);
return $results;
}
// Default, return false
return false;
Findings
If I perform count($results) like I did above, I get the total rows in the database (Let's say 50).
If I print_r($results), it shows the array with the proper number of entries (Let's say 10) that of course differs from the total rows in the database.
How can these two differ? It's as if the count($results) is misreading the result array.
More Findings
Within my actual php page, I call the class to retrieve the data like this.
$results = OrderModel::getServiceOrders();
echo count($results);
Strangely enough, if I then perform count($results) it gives me the correct reading of the result array (which in my example here would be 10).
I am perplexed by this as the count function is being performed on the exact same array. The only difference is one is called on the array within the class, and the other is called on the array returned from the class.
Does anyone have any ideas on how to solve this or why there is the discrepancy when using count() in this instance?
Thank you all in advance!
James
Additional Info
This is another mind numbing scenario. If I return the count along with the actual results, I can access it on the page with the correct value (10 rows). Yet, if I set it into a session variable, and access it that way, the count is the whole data set (50 rows). How is it even possible these two values are not the same?!
$results = $query->fetchAll();
Session::set("order_count", $total[0]); // Yields 50 (incorrect)
return [
"results"=> $results,
"count"=> $total[0], // Yields 10 (correct)
];
I'm a beginner who has problems with PHP :(
I have a PHP function which shows all the rows from the database table. Now I have to create paging to show only limited number of rows per one page.
I have a problem with retrieving a COUNT result from query. I want to create a condition where PHP & MySQL use LIMIT if number of rows is bigger than needed on one page. The following code:
$count = "SELECT COUNT(*) FROM articles";
$countq = $db->query($count);
$countrs = mysql_fetch_array($countq);
echo $countrs;
should display a number of rows. However, it does not. What am I doing wrong? I want to see a result to make sure that everything else will work fine. But I can't get it working.
Error: mysql_fetch_array() expects parameter 1 to be resource, object given
$db contains database connection information (server, user...) and is working
Use PDO for MySQL query.
$db = new PDO('mysql:host=#YOUR HOST#;dbname=#YOUR DB#;charset=utf8', '#YOUR LOGIN#', '#YOUR PASSWORD#');
$query = $db->query('SELECT COUNT(*) AS count FROM articles');
$countq = $query->fetch();
$query->closeCursor();
echo $countq['count'];
I hope this will help you
You will have to set the limit in the query like
$count = "SELECT COUNT(*) FROM articles LIMIT 5,10";
where 5 is the starting point and 10 is the total number of results you want.
You mention: $db but not what $db is? i mean is it a database object class? this will work directly if you are using the a database class, and if that's the case the class will also have functions which will allow you to query data without using mysql_fetch_array (actually mysqli_fetch_array).
$out = odbc_exec($connection, $query);
$first = odbc_fetch_array($out);
works just fine
$out = odbc_exec($connection, $query);
$first = odbc_num_rows($out);
works just fine
$out = odbc_exec($connection, $query);
$first = odbc_fetch_array($out);
if(odbc_num_rows($out)) {
//This should execute true, but doesn't
}
To my knowledge, any variable you pass ($out) to a function are only read.
How can calling fetch_array cause num_rows to error?
Update
I've even copied the result straight after the odbc_exec into a 'temp' variable & used that on the fetch_array, yet still it throws. seriously, what the f.
From PHP Manual:
Note: Using odbc_num_rows() to determine the number of rows available
after a SELECT will return -1 with many drivers.
odbc_num_rows method is typically used to detect the number of rows modified by an INSERT, UPDATE, or DELETE call.
If you want the full query returned plus the length, loop through the results using odbc_fetch_array storing them into an array and then determine the number of tuples from the array length.
If you are only wanting to query the number of rows in a given view, then you are better off to write a query that returns a COUNT and fetch that as an array.
I have this function in a linked file:
function getNumberOfHerps() {
$sql = "SELECT COUNT(ID)
FROM HERPES;";
return DBIface::connect()->query($sql);
}
I can call on this function from any other page in the website. What I want to do is to be able to use the result of the COUNT function in my php code on various pages, because I need to know how many herps there are in the database on several occasions in the code.
I tried this:
$result = getNumberOfHerps();
$numberOfHerps = $result['COUNT'];
But it caused a parse error on the second line, saying this:
Cannot use object of type PDOStatement as array.
Please tell me how I can use the result of a Count function in php code. Thanks :D
You are actually facing 2 separate items here that need your attention:
You can't access the COUNT(ID) returned from your query and
You are attempting to access data of a PDOStatement object as an array
So:
You can create an ALIAS for the value returned from the COUNT() function:
$sql = "SELECT COUNT(ID) as COUNT...";
This will provide to your result set a new column named COUNT that you can access your row count from.
Secondly, you need to perform a fetch operation on the PDOStatement in order to access it's data (this is what is causing your parse error). You have several options for accessing the result set in a PDOStatement:
list ($idCount) = $result->fetch();
// $idCount will now have the value of your COUNT column
or
$results = $result->fetch(PDO::FETCH_ASSOC);
// you can then access your COUNT as $results['COUNT'];
or even
$results = $result->fetch(PDO::FETCH_OBJ);
// you can then access your count as $results->COUNT
There are actually several additional FETCH_* styles available to use. The ones I've described though would likely be the most common. You can find more information about fetching PDO result sets at
http://us1.php.net/manual/en/pdostatement.fetch.php
I worked it out for myself, so I'll put my answer up for anyone else who finds this question:
I changed the function to this:
function getNumberOfHerps() {
$sql = "SELECT COUNT(1)
FROM HERPES";
return DBIface::connect()->query($sql)->fetchColumn(0);
}
So what the function now returns is the actual count value (the first column of the query). That means that in the webpage php file, you can access it in this way:
$numberOfHerps = getNumberOfHerps();
Much more simple.