I have a database with the following table:
id value
-----------
1 yes
2 no
3 no
4 maybe
I'm using some simple php to log the choices entered on a poll website. The user selects a radio box and it is entered into the above table. However, I want to make this a little more flexible. I created a simple backend that allowed an admin user to add or delete poll choices. What would I do to show on the frontend the number of votes for each individual choice, when the number of choices is not constant? I know I could do this easily if the poll choices were static but since the backend user will be changing the choices, how could I dynamically display the results?
I am not really sure what you are asking. Is it COUNT you're looking for?
Don't worry about the choices or the number of choices, grab all the votes/choices and iterate through them and add them to an array indiscriminately: http://codepad.org/LWPyuTqj
$total = array();
$votes = array(1=>'yes',2=>'no',3=>'no',4=>'maybe');
foreach($votes as $vote) {
if (!isset($total[$vote]))
$total[$vote] = 1;
else
$total[$vote] += 1;
}
print_r($total);
I would recommend google graph API for this. It is really easy!
http://code.google.com/apis/chart/interactive/docs/gallery/piechart.html
Generate the code dynamically, using the first example on the link above. First select the values. This assuming there is a question ID so you can relate to the question. In this case id 1.
$result = mysql_query('SELECT value,COUNT(*) as num FROM choises WHERE question_id = 1 GROUP BY value');
Then with PHP loop through the data
$results = array();
while ($row = mysql_fetch_assoc($result)){
$results[$row['value']] = $num;
}
With this you can generate the graph:
echo 'data.addRows('.count($results).');';
$i = 0;
foreach ($results as $value => $num){
echo'
data.setValue('.$i.', 0, "'.$value.'");
data.setValue('.$i.', 1, '.$num.');
';
$i++;
}
Related
I am trying to combine the results from 2 queries into a single array but am having problems getting the correct code.
I have a table called PrimaryEvents that I query to add to an array. This query works ok:
$rows = query("SELECT * FROM PrimaryEvents WHERE unit = ? ORDER BY event", $unit);
I add the data to an array using the following:
foreach ($rows as $row)
{
// $event = lookup($row["event"]); (removed as spotted by sergio not required)
$event["event"] = $row["event"];
$event["validity"] = $row["validity"];
$event["eventsrequired"] = $row["eventsrequired"];
$event["unit"] = $row["unit"];
$event["role"] = $row["role"];
//now we have the data lets try and do something to it
if ($event["role"] == "0")
{
//then the user is active so change value to a YES
$event["role"] = "ALL";
}
//add our stock to the portfolio array
$portfolio[] = $event;
}
So far everything works well. I would like to query a separate table and add certain results to the array portfolio[];
$rowsCompleted = query("SELECT * FROM portfolio WHERE id = ? ORDER BY name", $_SESSION["id"]);
My original plan was to use the following additional code to add the data of interest to the portfolio[] but it doesn't work:
//now add individual stats to the array
foreach($rowsCompleted as $row)
{
if ($portfolio["event"] == $row["name"]
{
//then add our number and date to the array
$portfolio["datecompleted"] = $row["datecompleted"];
$portfolio["number"] = $row["number"];
}
//else do nothing
}
My final aim was to pull the datacompleted value and number value from the portfolio table and then add it to the array ONLY if the event name matches the name in portfolio array.
Hopefully I have described my problem and required behaviour well enough.
Thanks for nay help that can be offered, I am new to php/sql so learning as I go.
Andy
EDIT:
Also tried the following loop to try and loop through the array:
//now add individual stats to the array
foreach($rowsCompleted as $row)
{
foreach ($portfolio["event"] as $item)
{
if ($portfolio["event"] == $row["name"]
{
//then add our number and date to the array
$portfolio["datecompleted"] = $row["datecompleted"];
$portfolio["number"] = $row["number"];
}
}
//else do nothing
}
EDIT2: To try and make my question more clear: The Primary-events table lists all the events a specific user has to complete. The portfolio table tracks which events have been completed by the user (by means of date-completed and number).
I want to run a query that lists all the events from Primary-events, then into those results add the date-completed and number from the users portfolio. If the answer is blank from the portfolio then the user has not yet completed the event but I would still like to list it from the Primary-events table data.
I tried 2 queries to start with as it seemed to follow what I was trying to achieve.
EDIT3:
New code with help from Barmar
foreach ($rows as $row) {
$event = lookup($row["event"]);
$event["event"] = $row["event"];
$event["validity"] = $row["validity"];
// $event["datecompleted"] = $row["datecompleted"];
// $event["number"] = $row["number"];
$event["eventsrequired"] = $row["eventsrequired"];
$event["unit"] = $row["unit"];
$event["role"] = $row["role"];
//now we have the data lets try and do something to it
if ($event["role"] == "0") {
//then the user is active so change value to a YES
$event["role"] = "ALL";
}
//add our stock to the portfolio array
$portfolio[] = $event;
//now add individual stats to the array
foreach ($rowsCompleted as $row) {
foreach ($portfolio as &$item) {
if ($item["event"] == $row["name"]) {
//then add our number and date to the array
$item["datecompleted"] = $row["datecompleted"];
$item["number"] = $row["number"];
}
}
}
}
The page still isn't being displayed by chrome so guessing i've missed something.
EDIT4: Page displayed, I am now getting undefined index errors when the table is rendered on the html page.
Specifically the undefined index errors are for date-completed and number. I am taking it to mean that these values are not being added to the portfolio array? Do try and help I have added an Else statement (as below) to ensure that even if the event isn't available the index is:
//now add individual stats to the array
foreach($rowsCompleted as $row)
{
foreach ($portfolio as &$item)
{
if ($item["event"] == $row["name"])
{
//then add our number and date to the array
$item["datecompleted"] = $row["datecompleted"];
$item["number"] = $row["number"];
}
else
{
$item["datecompleted"] = "Never";
$item["number"] = "0";
}
}
}
EDIT 5: Near Success. Sorry to reopen this but I have just noticed behaviour I wasn't expecting: The nested loop only sets the date-completed and number for the first value to matches from the portfolio table. The follow on values are not set. It would seem like the nested loop isn't stepping through all of the portfolio values, and just exiting once the first "event" == "name".
EDIT 6: Sample data and clarification on desired functions:
portfolio sample data
|id|name |number|datacompleted
|21|event1 |3 |2014-07-07
|15|event1 |5 |2014-07-05
|21|event2 |5 |2014-05-08
|15|event1 |1 |2013-05-05
id is the id of the user that completed the event
number is the number of events completed
PrimaryEvents sample data
|id|event |validity|eventsrequired
|1 |event1 |7 |10
|1 |event2 |25 |1
|1 |event3 |12 |50
id is the id of the user that created the entry (used for historic purpose only)
The desired functionality is:
The query should create a an array to allow a html table to be created of everything within the Primary-events table. This table lists the events the user must complete.
The second query or current nested loop should gather the data from the portfolio table for the current user id, then match the event name to the name in the Primary-events array and update (if present) the number and date-completed value. (I.E populate the data for the events that the user has completed).
The current code merges the data from portfolio only for the first match, but then the nested loop seems to exit.
Hopefully this is a more clear description of what I am trying to achieve.
EDIT: I have changed the functionality to use the Left join statement below but am still having problems:
The table only contains some of the events from primary-events table and not all of them. The events being pulled over are only those that the user has completed, the ones the user has not yet completed are not being shown.
EDIT: This query seems to work:
$allEvents = query("SELECT * FROM PrimaryEvents LEFT JOIN portfolio ON (PrimaryEvents.event = portfolio.name) WHERE PrimaryEvents.event = ? AND (portfolio.id = ? Or portfolio.id is null) ORDER BY PrimaryEvents.event", $currentEvent, $_SESSION["id"]);
You need to notice that portfolio is not associative array but multidimensional array, so you cannot access it using $portfolio["event"]. You should use $portfolio[0]["event"], $portfolio[1]["event"] and so on.
It's hard to show you exact solution because I don't know how those arrays/database queries should be merged.
EDIT
It seems your query should look like this:
query("SELECT * FROM PrimaryEvents e LEFT JOIN portfolio p ON e.event = p.name WHERE e.unit = ? AND p.id = ? ORDER BY e.event", $unit,$_SESSION["id"]);
EDIT2
I haven't proposed nested loop (as it's now in modified question) because of performance loss.
You're getting closer with your second query, but still confused about what's in each array.
foreach($rowsCompleted as $row)
{
foreach ($portfolio as &$item) // Need to use reference so we can update it
{
if ($item["event"] == $row["name"])
{
//then add our number and date to the array
$item["datecompleted"] = $row["datecompleted"];
$item["number"] = $row["number"];
break;
}
}
}
To avoid the nested loop, it would be better for $portfolio to be an associative array. Change the code for your initial query to use:
//add our stock to the portfolio array
$portfolio[$event["name"]] = $event;
Then the second loop becomes:
foreach($rowsCompleted as $row)
{
$name = $row["name"];
if (isset($portfolio[$name]) {
$portfolio[$name]["datecompleted"] = $row["datecompleted"];
$portfolio[$name]["number"] = $row["number"];
}
}
I need to get a random number between, lets say 1-200, but at the same time I need to prevent selecting a random number that has already been used for a particular REMOTE_ADDR (as stored in a table).
This is what I have so far (I have tried several different approaches):
$ip = $_SERVER['REMOTE_ADDR'];
$query7 = "
SELECT *
FROM IP
WHERE IP = '$ip'
";
$result7 = mysql_query($query7) or die(mysql_error());
$rows7 = mysql_num_rows($result7);
while ($row7 = mysql_fetch_array($result7)){
$id = $row7['ID'];
}
I'm using the random number to pick an image to display, but my users are complaining that the images selected for them is not random enough; ie, the same picture is getting "randomly" selected too often, sometimes showing the same image over and over.
It does not have to be in PHP, if there is another option.
Something like that
// all ids from 1 to 100
$all = array_fill(1, 200, 0);
// remove used
foreach ($used as $i) {
unset($all[$i]);
}
// get survived keys
$keys = array_keys($all);
// get random position, note that the array with keys is 0 based
$j = rand(0, count($all) - 1);
return $keys[$j];
Run your select and instead of using *, only select the id column. Then use:
while($row7[] = mysql_fetch_array($query7));
do{
$rand = rand(0,200);
}while(in_array($rand,$row7));
You can do it all in mysql. Have one table that has your list of images, and another table that has the list of IP addresses and the images that have already been shown to that IP. Then you select and join the tables and order the result randomly.
SELECT image_id FROM images
LEFT JOIN shown_images ON images.image_id=shown_images.image_id AND ip_addr=[#.#.#.#]
WHERE shown_images.image_id IS NULL
ORDER BY RAND() LIMIT 1;
After you show an image to an IP, just insert a record into the shown_images table with the IP and the image ID. That will work right up until that have seen all the images. Then you can delete the records and start over.
This answer assumes that you have 200 items, and collect the items which you do not want to show. Alternatively, you can query only id's of available items and choose from these, you would need to create a table with available items for that.
Create a map which maps consecutive numbers to (non-consecutive) available numbers. Suppose the numbers 1 and 3 are in use, you can map to 2 and 4 (and so on).
Actually, it is possible to use a simple array (not-associative) for this. You can do something like this:
$reserved = array(1, 3); // fill $reserved using your code
$available = array();
for ($i = 1; $i <= 200; $i++) {
if (!in_array($i, $reserved)) {
$available[] = $i;
}
}
if (count($available) > 0) {
$random_index = rand(0, count($available) - 1);
$r = $available[$random_index];
} else {
// Nothing available!
}
There will be nothing to choose when you run out of pictures that have not been displayed yet. In this case, count($available) will be zero. One way to solve this would be to clear your list of displayed images for the current IP and choose again; see also other answers for this.
well, i wanna pull out some data from a mysql view, but the wuery dos not seem to retrieve anything ( even though the view has data in it).
here is the code i've been "playing" with ( i'm using adodb for php)
$get_teachers=$db->Execute("select * from lecturer ");
//$array=array();
//fill array with teacher for each lesson
for($j=0;$j<$get_teachers->fetchrow();++$j){
/*$row2 = $get_lessons->fetchrow();
$row3=$row2[0];
$teach=array(array());
//array_push($teach, $row3);
$teach[$j]=mysql_fetch_array( $get_teachers, TYPE );
//echo $row3;*/
$row = $get_teachers->fetchrow();
//$name=$row[0]+" "+$row[0]+"/n";
//array_push($teach, $row1);
echo $row[0]; echo " ";echo $row[1]." ";
//$db->debug = true;
}
if i try something like "select name,surname from users", the query partially works . By partially i mean , while there are 2 users in the database, the loop only prints the last user.
the original query i wanted to execute was this
$get_teachers=$db->Execute("select surname,name from users,assigned_to,lessons
where users.UID=assigned_to.UID and lessons.LID=assigned_to.LID and
lessons.term='".$_GET['term']."'");
but because it didnt seem to do anything i tried with a view ( when you execute this in the phpmyadmin it works fine(by replacing the GET part with a number from 1 to 7 )
the tables in case you wonder are: users,assigned_to and lessons. ( assigned_to is a table connecting each user to a lesson he teaches by containing UID=userid and LID=lessonid ). What i wanted to do here is get the name+surname of the users who teach a lesson. Imagine a list tha displays each lesson+who teaches it based on the term that lesson is available.
Looking at http://adodb.sourceforge.net/ I can see an example on the first page on how to use the library:
$rs = $DB->Execute("select * from table where key=123");
while ($array = $rs->FetchRow()) {
print_r($array);
}
So, you should use:
while ($row = $get_teachers->fetchrow()) {
instead of:
for ($j = 0; $j < $get_teachers->fetchrow(); ++$j) {
The idea with FetchRow() is that it returns the next row in the sequence. It does not return the number of the last row, so you shouldn't use it as a condition in a for loop. You should call it every time you need the next row in the sequence, and, when there are no more rows, it will return false.
Also, take a look at the documentation for FetchRow().
for($j=0;$j<$get_teachers->fetchrow();++$j){
... a few lines later ...
$row = $get_teachers->fetchrow();
See how you call fetchrow() twice before actually printing anything? You remove two rows from the result set for every 1 you actually use.
while ($row = $get_teachers->fetchrow()) {
instead and don't call fetchrow() again within the loop.
Because you're fetching twice first in the loop
for($j=0;$j<$get_teachers->fetchrow();++$j){
... some code ...
// And here you fetch again
$row = $get_teachers->fetchrow();
You should use it like this
while ($row = $get_teachers->fetchrow()) {
I have a table in phpmyadmin that stores an 'id' (auto inc), 'title' and a 'date'.
I have a webpage where I display the 10 latest items (I simply order by ID).
On that page I print the title and the date. My wish is to also display the number of the posted item, so the first posted item is 1, the second is 2, etc. I cannot simply print the ID from the database because if I delete a row, the numbers aren't straight anymore.
My idea was to put all the data in an array but I have no clue what the best way to do this is and how I could print that item number. So for example when I want to display the 54th item I can easily print $items[54][id] or something and it will show me the number 54 and to display the title I print $items[54][title].
I don't know if there are simpler methods, plus arrays always start at 0, but my items must start at 1.
Besides this page that shows the 10 latest items, there is another page where it gets the title of the item out of the URL. How will I be able to search the title in the array and display the data the same way but only for that requested title?
Thanks in advance!
"SELECT COUNT(id) as cnt FROM mytable";
you can select the count of all database entries.
and then assign it to your iterator
$i = $row['cnt']; // this will hold the ammount of records e.g. 21
// other query
while($row = mysql_fetch_assoc($result)) {
echo $i;
$i--; // this will decrement on every iteration 21, 20 , 19, and so on.
}
First off. I would add a timestamp field to the database and order by that instead as it feels overall more reliable and gives you additional details which may prove handy later.
To create the multidimensional array I would do something like:
$result = mysql_query(...);
$items = array();
while($item = mysql_fetch_assoc($result)) {
$items[] = $item;
}
Now $items[12] for example would give you item number 13 (since it's 0-indexed).
Lastly, to select only the item with a specific title I would use a query which included a WHERE clause, like
"SELECT ... FROM ... WHERE title = '".$title."'"
It's very important to sanitize this variable before using it in the query though.
You can read more about MySQL on a lot of places. A quick googling gave me this: http://www.tutorialspoint.com/mysql/index.htm
You should learn PHP before starting to program in PHP ;) Read and work through the PHP manual and some tutorials!
As to your question it is a simple loop you want to do. One way of doing it as an example.
Fetch the 10 last items from the database in any way you like, following some code, partly pseudo-code.
$markup = '';
for ($i=1; $i<=count($items); $i++)
{
$markup .= 'Item ' . $i . ': ' . $items['date'] . ' - ' . $items['title'];
$markup .= 'read more';
$markup .= PHP_EOL;
}
echo $markup;
I don't know how you print out your data exactly, but I assume there is a loop in there. Simply set a counter that increments by one at every row and print its value.
As for the title search, you'll have to run another query with a WHERE title = '$title' condition, but beware of SQL injection.
I have been racking my brains over this for a while now. Here is the data I have in the SQL data base as an example:
ID | TYPE | DATA
1 | TXT | TEST
2 | PHP | php
3 | JS | JAVASCRIPT
That is just an example, there are multiple listing for TXT, PHP and JS throughout the table. What I want to do is retrive all the data and display it all into separate drop down/select boxes. Meaning, select box one would list all data with type TXT, select box two would list all data with type PHP and select box 3 would list all data with type JS. The only way I have came about doing this is doing individual sql queries for each different type. I know there is a way to do it all in 1 query and then display it the way I want to but I just can't seem to figure out how and I know its going to drive me nuts when someone helps and I see just how they did it.
The only way that I know of to get all of the data in one query is just to do a generic SELECT * FROM tbl, and then you can group them in the code:
$res = mysqli_query('SELECT * FROM tbl');
$data = array();
while($row = mysql_fetch_assoc($res)) {
$type = $row['type'];
$data[$type][] = $row;
}
// $data contains all of the record, grouped by the TYPE column
foreach($data as $type => $records) {
echo "records for $type: <select>";
foreach($records as $record) {
echo "<option value='$id'>$id</option>";
}
echo "</select>";
}
Just retrieve all records and loop through them using PHP. Use an iterator if the recordset is going to be huge to prevent using too much memory.
$lists = array();
foreach($recordset as $record) {
$lists[$record['type']][$record['id']] = $record['data'];
}
Know you have an array containing all data.
Just order it by Type and make a loop using "foreach" into the results, changing of select box when the type is different than the preivous.
In this way you only loop once over the array.
You can do kind of grouping with "ORDER BY TYPE":
SELECT id, data
FROM table
ORDER BY type;
Then, in data output loop you can track current type, and build another select box once type changed:
$currentType = "no type";
while($row = mysql_fetch_assoc($res)) {
if ($currentType != $row['type']) {
$currentType = $row['type'];
// start new select box here
}
// do some other work here
}
BTW, such approach looks like kind of hack :)