So I have a form that lets people add a list of grades, and using jQuery they are able to add up to 9 extra fields. (Meaning they can submit any number from 1 to 10 grades). What I want to know is how I can go about storing this in my database, as I do not want to convert them all into one string. My concern is that because I don't know how many grades the user is going to enter, I can't set a definitive array number to store (or can I?)
Sorry if this is not terribly well explained, I'm still relatively new to PHP and SQL!
A quick assumption if I am not mistaken would be: saving one user with multiple grades for multiple subjects can be achieved like this.
Firstly we get one user id from the form and put it in PHP:
$id = isset($_POST['id'])? $_POST['id']:'';
Then get multiple grades and subjects which would be sent as comma separated values:
//$id= explode(',',$_POST['id']);// For multiple users
$grade= explode(',',$_POST['grade']);
$subj= explode(',',$_POST['subject']);
$entry= explode(',',$_POST['entry']);
Now count the number of grades: $count= count($grade);
Use the count in a for loop to have insert in loop:
for ($i = 0; $i < $count; $i++) {
try {
$dbh->beginTransaction(); //$dbh is your PDO connection
$insertQ = "INSERT INTO `grades` (id, grade, subject, entry)
VALUES('$id', '$grade[$i]', '$subj[$i]','$entry[$i])";
$dbh->query($insertQ);
$dbh->commit();
} catch (Exception $e) {
$error = $e->getMessage();
}
}
Hope this may help.
Related
This question already has answers here:
Is there a way to fetch associative array grouped by the values of a specified column with PDO?
(8 answers)
Closed 1 year ago.
I want to send the overdue tasks that are assigned to a specific employee as an email summary. It is possible that multiple todos are assigned to the same employee. So multiple todos can be assigned to the same employee AND are overdue. That's where the problem starts...
So what I did, is grabbing all the overdue tasks from the database and then I grabbed the assigned employees to the tasks. I created an array that consists of the todoID, the employeeID and the employeeEmail. Now, is there a better way to do this and if not, how can I group the rows by email address?
The end result should be an array that shows every overdue todo that's assigned to one employee.
// Get all Todos that are not archived
$sql = "SELECT * FROM todo WHERE archiv = 0";
$abfrage = $db->prepare($sql);
$abfrage->execute();
$overdue_array = array();
// Now we get everything that's overdue from the Database
while ($row = $abfrage->fetch()) {
if ($row["status"] !== 3) {
if ($row["archiv"] !== 1) {
if ($row["durchfuehrung"]) {
if (strtotime($row["durchfuehrung"]) < strtotime(date("Y-m-d"))) {
// Here we now get the email from the assiged employee to the todo
$sql2 = "SELECT email FROM mitarbeiter WHERE mitarbeiterID = :mitarbeiterFID";
$abfrage2 = $db->prepare($sql2);
$abfrage2->bindParam("mitarbeiterFID", $row["mitarbeiterFID"]);
$abfrage2->execute();
while ($row2 = $abfrage2->fetch()) {
$overdue_array[] = array("todoID" => $row["todoID"], "mitarbeiterID" => $row["mitarbeiterFID"], "mitarbeiterEmail" => $row2["email"]);
}
}
}
}
}
The result is the following:
Let's pretty up your scripting with some best practices...
only add columns to your SELECT clause when you have a use for them
enjoy PDO's very handy fetching modes -- FETCH_GROUP is perfect for your case.
always endeavor to minimize trips to the database
always endeavor to minimize the number of loops that you use.
Recommended code (yes, it is just that simple):
$sql = "SELECT email, todoID, mitarbeiterFID
FROM todo
JOIN mitarbeiter ON mitarbeiterID = mitarbeiterFID
WHERE archiv = 0
AND status != 3
AND durchfuehrung < CURRENT_DATE";
foreach ($db->query($sql)->fetchAll(PDO::FETCH_GROUP) as $email => $rows) {
sendSummary($email, $rows, $company, $db);
}
For the record, I don't know where $company comes from.
You could strongly improve your request with a JOIN (as said #mickmackusa) and even structure your response with PDO Fetch Statements (like PDO FETCH_GROUP or PDO FETCH ASSOC). You could directly get the result you want with one (bigger but better) request.
Nevertheless, if you want to simply sort your array with PHP, the use of foreach can do the job.
foreach ($array as $todo) {
if (!isset($newArray[$todo["mitarbeiterEmail"]])) {
// Here we create a new array with the email as a key and put the two first key-values in it with array_slice
$newArray[$todo["mitarbeiterEmail"]] = [array_slice($todo, 0, 2)];
} else {
// Here we push another todo if the email is already declared as a key
array_push($newArray[$todo["mitarbeiterEmail"]], array_slice($todo, 0, 2));
}
}
// Check your new array
print_r($newArray);
You could also avoid foreach by combining array_multisort to sort by emails then array_reduce to remove duplicate elements keeping associated data. Many solutions can be proposed.
So, I've been looking for a solution to my case, but I've kept finding only partial and not quite solving-the-matter kind of answers.
First, let me describe what I'm trying to achieve.
In my database I have two tables: PLACES and PLACES_CATEGORIES which are connected by a third table PLACES_A_CATEGORIES in an entity many to many. That is because a PLACE can be characterised by one or more CATEGORIES (but it can also have no CATEGORIES at all).
I want to add data send in one form to two tables: PLACES and PLACES_A_CATEGORIES. The user has all the categories listed with checkboxes and he may (but doesnt have to) check one or more of them.
I automated the display of those checkboxes so it reacts accordingly to changes in database (like adding or removing categories). This part works just fine, but let me show the code for you as it may be useful in solving the real issue:
$query = "SELECT name FROM places_categories";
$result = $connection->query($query);
$category_no = $result->num_rows;
echo "Categories of places:";
for ($j = 0; $j < $category_no; ++$j)
{
$category = $result->fetch_assoc()['name'];
echo '<br><input type="checkbox" id="'.$category.'" name="places_categories" value="'.$category.'"><label for="'.$category.'">'.$category.'</label><br>';
}
So, let's return to the problem. I want to:
always add data (only one row) to the table PLACES
add as many rows of data to the table PLACES_A_CATEGORIES as many checkboxes have been checked
So, let me now show you how I've tried to solve the matter and below I'll explain what and why I've done.
if ($everything_OK==true)//Hurra, everything is ok, lets add the place to the database
{
mysqli_query($connection, "SET NAMES utf8");//need it for special characters
//Adding multiple rows of data to database
$query = "SELECT name FROM places_categories";
$result = $connection->query($query);
$category_no = $result->num_rows;
for ($j = 0; $j < $category_no; ++$j)
{
$category[$j] = $result->fetch_assoc()['name'];
if ($_POST['places_categories'] == $category[$j])
{
//counts number of records in table PLACES
$query1 = "SELECT name FROM places";
$result1 = $connection->query($query1);
$places_no = $result1->num_rows;
$places_no += 1;
//looks for category_id in table places_categories where the name matches the current value from form
$query2 = "SELECT category_id FROM places_categories WHERE name='$category[$j]'";
$result2 = $connection->query($query2);
$what_category_id = mysqli_fetch_array($result2);
$connection->query("INSERT INTO places_a_categories VALUES ('$places_no', '$what_category_id')");
}
}
if ($connection->query("INSERT INTO places VALUES (NULL, 0, 0, 0, '$name', '$wysokosc', '$zajawka', '$zatloczenie', '$data_dodania', '$data_edycji', '$szer_geo', '$dlu_geo', '$tytul', '$opis', '$adres', '$tresc')"))
{
echo "Test!";
}
else
{
throw new Exception($connection->error);
}
}
Okay, explanations:
The part which inserts data to the table PLACES works just fine. It
adds data to the database according to what user has added in a form.
No help needed here.
Because of the before-mentioned automation of
table CATEGORIES I want to check how many of categories actually are
in the database. The first part of the code was supposed to do this.
with instruction FOR I assign every existing category to an array with a value equal to the name of the category in the database
then with instruction IF I want to add ass many rows of data to the table PLACES_A_CATEGORIES as many checkboxes have been checked
first value $places_no equals to id of the place which is being added to another table
second value $what_category_id looks for category_id in table PLACES_CATEGORIES where the name matches the current value got from the checkbox
And what are the results? Data is added to the table PLACES with no problem at all. But there is nothing added to the second table. Furthermore, I get no error message of any kind. It's probably some stupid error I just can't see... Any ideas? What have I done wrong?
I hope someone can help. Basically I'm fairly OK with PHP and MySQL,
however, I need some advice on how to complete this task.
As my system is to complex to explain, I've condensed it down so it's clearer.
Basically, I have an simple PHP Form that asks the user for their:
Name,Item Ordered, Item Quantity. The OrderID is autogenerated and is a random
4 number. So at the moment I do it with this:
$sql="INSERT INTO system_orders
(orderid,name,itemordered,itemquantity) VALUES
('$randomgeneratednumber', '$_POST[name]','$_POST[itemordered]','$_POST[itemquantity]')"; and
run $sql
Now what I want is if they put the quantity as "2", I want it to create an additional row and append
the randomgeneratednumber. For example, if the randomgeneratednumber was 9876 and the quantity was 2, it would create an additional new row, with the $randomgeneratednumber-2, in this example 9876-2
Would anyone know how to achieve this?
I have temporarily used an if statement (which I know is really bad programming practice)
to append the -2 manually, but there must be a function out there to detect if $quantity = 2
then create additional row with the appended -2 and so on for 3,4,5,6,7,8...
Use a loop:
if ($quantity > 1) {
for ($q = 2; $q <= $quantity; $q++) {
$sql = "INSERT INTO system_orders
(orderid,name,itemordered,itemquantity) VALUES
('$randomgeneratednumber-$q', '$_POST[name]', '$_POST[itemordered]', '$_POST[itemquantity]')";
// run $sql
}
}
You also should switch to a database API that supports parametrized queries, or escape the user-supplied inputs.
$sql="INSERT INTO system_orders
(orderid,name,itemordered,itemquantity) VALUES
('$randomgeneratednumber', '$_POST[name]','$_POST[itemordered]','$_POST[itemquantity]')"; and
run $sql
if ($_POST['itemquantity']>1) {
$multipleorderid = $randomgeneratednumber."-".$POST['itemquantity'];
$sql="INSERT INTO system_orders
(orderid,name,itemordered,itemquantity) VALUES
('$multipleorderid', '$_POST[name]','$_POST[itemordered]','$_POST[itemquantity]')"; and
run $sql
}
I have a form where I am trying to implement a tag system.
It is just an:
<input type="text"/>
with values separated by commas.
e.g. "John,Mary,Ben,Steven,George"
(The list can be as long as the user wants it to be.)
I want to take that list and insert it into my database as an array (where users can add more tags later if they want). I suppose it doesn't have to be an array, that is just what seems will work best.
So, my question is how to take that list, turn it into an array, echo the array (values separated by commas), add more values later, and make the array searchable for other users. I know this question seems elementary, but no matter how much reading I do, I just can't seem to wrap my brain around how it all works. Once I think I have it figured out, something goes wrong. A simple example would be really appreciated. Thanks!
Here's what I got so far:
$DBCONNECT
$artisttags = $info['artisttags'];
$full_name = $info['full_name'];
$tel = $info['tel'];
$mainint = $info['maininst'];
if(isset($_POST['submit'])) {
$tags = $_POST['tags'];
if($artisttags == NULL) {
$artisttagsarray = array($full_name, $tel, $maininst);
array_push($artisttagsarray,$tags);
mysql_query("UPDATE users SET artisttags='$artisttagsarray' WHERE id='$id'");
print_r($artisttagsarray); //to see if I did it right
die();
} else {
array_push($artisttags,$tags);
mysql_query("UPDATE users SET artisttags='$artisttags' WHERE id='$id'");
echo $tags;
echo " <br/>";
echo $artisttags;
die();
}
}
Create a new table, let's call it "tags":
tags
- userid
- artisttag
Each user may have multiple rows in this table (with one different tag on each row). When querying you use a JOIN operation to combine the two tables. For example:
SELECT username, artisttag
FROM users, tags
WHERE users.userid = tags.userid
AND users.userid = 4711
This will give you all information about the user with id 4711.
Relational database systems are built for this type of work so it will not waste space and performance. In fact, this is the optimal way of doing it if you want to be able to search the tags.
I have an online form which collects member(s) information and stores it into a very long MySQL database. We allow up to 16 members to enroll at a single time and originally structured the DB to allow such.
For example:
If 1 Member enrolls, his personal information (first name, last name, address, phone, email) are stored on a single row.
If 15 Members enroll (all at once), their personal information are stored in the same single row.
The row has information housing columns for all 'possible' inputs. I am trying to consolidate this code and having every nth member that enrolls put onto a new record within the database.
I have seen sugestions before for inserting multiple records as such:
INSERT INTO tablename VALUES
(('$f1name', '$f1address', '$f1phone'), ('$f2name', '$f2address', '$f2phone')...
The issue with this is two fold:
I do not know how many records are
being enrolled from person to person
so the only way to make the
statement above is to use a loop
The information collected from the
forms is NOT a single array so I
can't loop through one array and
have it parse out. My information is
collected as individual input fields
like such: Member1FirstName,
Member1LastName, Member1Phone,
Member2Firstname, Member2LastName,
Member2Phone... and so on
Is it possible to store information in separate rows WITHOUT using a loop (and therefore having to go back and completely restructure my form field names and such (which can't happen due to the way the validation rules are built.)
If you form's structured so that all the fields are numbered properly, so that a "firstname #1" is matched up with all the other "#1" numbered fields, then a loop is the simplest solution.
start_transaction();
$errors = false;
for ($i = 1; $i <= 16; $i++) {
if (... all $i fields are properly filled in ...) {
$field = $_POST["field$i"];
$otherfield = $_POST["otherfield$i"];
etc...
... insert into database ...
} else {
... handle error condition here
$errors = true;
}
}
if (!$errors) {
commit_transaction();
} else {
rollback();
}
If they're numbered randomly, so that firstname1 is matched with lastname42 and address3.1415927, then you'd have to build a lookup table to map all the random namings together, and loop over that
followup per comment:
well, if you absolutely insist on maintaining this database structure, where each row contains 16 sets of repeated firstname/lastname/etc.. records, then you'd do something like this:
$first = true;
for ($i = 1; $i <= 16; $i++) {
if (fields at position $i are valid) {
$firstname = mysql_escape_real_string($_POST["F{$i}name"]);
$lastname = mysql_real_escape_string($_POST["F{$i}lastname"]);
if ($first) {
$dbh->query("INSERT INTO table (f{$i}name, f{$i}lastname) VALUES ($firstname, $lastname);"
$recordID = $dbh->query("SELECT last_insert_id();");
$first = false;
} else {
$dbh->query("UPDATE table SET f{$i}name=$firstname, f{$i}lastname=$lastname WHERE idfield=$recordID");
}
}
}
It's ugly, but basically:
loop through the form field sets until you find a valid set (all required fields filled in, valid data entered, etc..
Insert that data set into the database to create the new record
retrieve ID of that new record
continue looping over the rest of the fields
for every subsequent set of valid records, do an update of the previously created record and add in the new fieldset data.
Though, honestly, unless you've got some highly offbeat design need to maintain a single table with 16 sets of repeated columns, you'd be better off normalizing a bit, and maintain two seperate tables. A parent "enrollment" table, and a child "members" table. That way you can create the parent enrollment table, then just insert new children as you encounter them in the form.
update #2:
well, a simplified form of a normalized layout would be:
signups (id, name, etc...)
signup_members (id, signup_id, firstname, lastname)
and you'd pull the full signup record set with the following query:
SELECT signups.id, signups.name, signup_members.id, firstname, lastname
FROM signups
LEFT JOIN signup_members ON signups.id = signup_members.signup_id
ORDER BY ...
That would give you a series of rows, one for each 'member' signup. To build the CSV, a simple loop with some state checking to see if you've reached a new signup yet:
$oldid = null;
$csv = ... put column headers here if you want ...
while ($signup = $result->fetchrow()) {
if ($signup['signups.id'] != $oldid) {
// current signup doesn't match previous seen id, so got a new signup record
$csv .= "\n"; // start new line in CSV
$csv .= ... add first few columns to new csv row ...
$oldid = $signup['signups.id']; // store new record id
} else {
$csv .= ... add extra member columns to current csv row ...
}
}
What you're trying to do could be simpler, but to solve the problem, you can join the user information into one variable, separated by a char of your choice and send it to Mysql DB...
$user1 = $f1name . ';' . $f1address . ';' . $f1phone;
$user2 = $f2name . ';' . $f2address . ';' . $f2phone;
$user3 = $f3name . ';' . $f3address . ';' . $f3phone;
INSERT INTO table-name VALUES('$user1','$user2','$user3')
To extract, just "explode" the value by the ";".
If you use the same order for all users data, and if you send a verification string in case one user leaves a field blank, works just fine :)
humm... this work's just fine if the user isn't allowed to use ";" as "personal data" :)
Hope it helps U!
I think you might want to look at "variable variables":
http://php.net/manual/en/language.variables.variable.php
Then you could conceivably loop through from 1 to 15, without having to rename your form fields.