Been all over the place and spent 8 hours working loops and math...still cant get it...
I am writing a CP for a customer. The input form will allow them to add a package deal to their web page. Each package deal is stored in mysql in the following format
id header item1 item2 item3...item12 price savings
The output is a table with 'header' being the name of the package and each item being 1 of the items in the package stored in a row within the table, then the price and amount saved (all of this is input via a form and INSERT statement by the customer, that part works) stored rows as well.
Here is my PHP:
include 'dbconnect.php';
$query = "SELECT * FROM md ";
$result = mysql_query($query);
while ($row = mysql_fetch_array($result)) {
//Print 4 tables with header, items, price, savings
//Go to next row (on main page) and print 4 more items
//Do this until all tables have been printed
}
mysql_free_result($result);
mysql_close($conn);
Right now the main page is simpley a header div, main div, content wrap and footer div.
Ideal HTML output of a 'package' table, not perfect and a little confusing
$header
$item1
$item2
ect...
$price$savings
I basically want the PHP to print this 4 times per row on the main page and then move to the next row and print 4 times and continue until there are no more items in the array. So it could be row 1 4 tables, row 2 4 tables, row 3 3 tables.
Long, confusing and frustrating. I about to just do 1 item per row..please help
Jake
You say "tables", but do you mean cells?
The basic flow would be:
$res = mysql_query(...) or die(mysql_error());
if (mysql_numrows($res) == 0) {
... say there's nothing to show ...
} else {
... print table header ...
while($row = mysql_fetch_assoc($res)) {
... print row ...
}
... print table footer
}
if i get your question right you need to use a loop, something like a for
while ($row = mysql_fetch_array($result)) {
for($i=1; $i<=3; $i++){
//print table (change $i values to change number of loops)
}
}
if i didnt get it right, please post an example of how the table should look like.
$items_per_line=4;
$counter=$items_per_line;
while ($row = mysql_fetch_array($result)) {
if($counter <1){
$counter=$items_per_line;
// goto next pages
}
// print header etc.
$counter--;
}
Related
I have a page that's suppose to create a Div for every 9 entries in the database.
Every Div will consist of 3 ULs and every UL will consist of 3 LIs.
Something like this:
Demo
So, every LI is where each entry is displayed and every Div is essentially a unique page.
This is my code so far:
$sql = mysql_query("SELECT * FROM `reviews`") or die(mysql_error());
$e_count = mysql_num_rows($sql);
$r_pages = ceil($e_count / 9);
$x = 1;
$y = 1;
if($e_count > 9){ // if there are more than 9 entries in the database
for($x=1;$x<=$r_pages;$x++){ // creates a div for every 9 items in the database
echo '<div class="rp_pages" id="rp_page_'.$x.'">';
for($y=1;$y<=3;$y++){ // creates 3 ULS in each "page"
echo '<ul>';
// 3 lis should appear here
echo '</ul>';
}
echo '</div>';
}
}
The problem is, i don't want to use multiple queries with a LIMIT in them to select the respective entries.
Can this be done with just a single query?
I only see one query (the first select). After that, instead of using it to count the number of rows, parse each row and extract the review text, this way:
Let's imagine that the reviews table has a text column where the review text is saved. Having your code:
$sql = mysql_query("SELECT * FROM `reviews`") or die(mysql_error());
$e_count = mysql_num_rows($sql);
$r_pages = ceil($e_count / 9);
$x = 1;
$y = 1;
if($e_count > 9){ // if there are more than 9 entries in the database
for($x=1;$x<=$r_pages;$x++){ // creates a div for every 9 items in the database
echo '<div class="rp_pages" id="rp_page_'.$x.'">';
for($y=1;$y<=3;$y++){ // creates 3 ULS in each "page"
echo '<ul>';
// Here the code that extract the rows from the query.
for($z=1;$z<=3;$z++){
echo '<li>';
if($data = mysql_fetch_array($sql, MYSQL_ASSOC)) {
echo $data['text']; // Use some type of parser to show special characters like < or > as text, so you are safe from code injection.
}
echo '</li>';
}
echo '</ul>';
}
echo '</div>';
}
}
As you can see, it creates a new loop to create the 3 lis and in each li extracts the text selected in the query, then echoes it.
As http://php.net/manual/en/function.mysql-fetch-array.php says:
Returns an array that corresponds to the fetched row and moves the
internal data pointer ahead.
So the next time you fetch a row, it will be the next one.
PD: PHP's mysql is deprecated. Use mysqli instead. Is the same but with another library that is currently under developement, not like mysql.
I have a query like this:
$sql = "SELECT * FROM doctors WHERE city ='$city' LIMIT 10 ";
$result = $db->query($sql);
And I show the result like this :
while($row = $result->fetch_object()){
echo $row->city;
}
The Problem :
Mysql , will search through my database to find 10 rows which their city field is similar to $city.
so far it is OK;
But I want to know what is the exact row_number of the last result , which mysql selected and I echoed it ?
( I mean , consider with that query , Mysql selected 10 rows in my database
where row number are:
FIRST = 1
Second = 5
Third = 6
Forth = 7
Fifth = 40
Sixth = 41
Seventh = 42
Eitghth = 100
Ninth = 110
AND **last one = 111**
OK?
I want to know where is place of this "last one"????
)
MySQL databases do not have "row numbers". Rows in the database do not have an inherent order and thereby no "row number". If you select 10 rows from the database, then the last row's "number" is 10. If each row has a field with a primary id, then use that field as its "absolute row number".
You could let the loop run and track values. When the loop ends, you will have the last value. Like so:
while($row = $result->fetch_object()){
echo $row->city;
$last_city = $row->city;
}
/* use $last_city; */
To get the row number in the Original Table of the last resultant (here, tenth) row, you could save the data from the tenth row and then, do the following:
1. Read whole table
2. Loop through the records, checking them against the saved data
3. Break loop as soon as data found.
Like So:
while($row = $result->fetch_object()){
echo $row->city;
$last_row = $row;
}
Now, rerun the query without filters:
$sql = "SELECT * FROM doctors";
$result = $db->query($sql);
$rowNumber = 0;
while($row = $result->fetch_object()) {
if($row == $last_row) break;
$rowNumber++;
}
/* use $rowNumber */
Hope this helps.
What you can do is $last = $row->id; (or whatever field you want) inside your while loop - it will keep getting reassigned with the end result being that it contains the value of the last row.
You could do something like this:
$rowIndex = 0;
$rowCount = mysqli_num_rows($result);
You'd be starting a counter at zero and detecting the total number of records retrieved.
Then, as you step through the records, you could increment your counter.
while ( $row = $result->fetch_object() ) {
$rowIndex++;
[other code]
}
Inside the While Loop, you could check to see whether the rowIndex is equal to the rowCount, as in...
if ($rowIndex == $rowCount) {
[your code]
}
I know this is a year+ late, but I completely why Andy was asking his question. I frequently need to know this information. For instance, let's say you're using PHP to echo results in a nice HTML format. Obviously, you wouldn't need to know the record result index in the case of simply starting and ending a div, because you could start the div before the loop, and close it at the end. However, knowing where you are in the result set might affect some styling decisions (e.g., adding particular classes to the first and/or last rows).
I had one case in which I used a GROUP BY query and inserted each set of records into its own tabbed card. A user could click the tabs to display each set. I wanted to know when I was building the last tab, so that I could designate it as being selected (i.e., the one with the focus). The tab was already built by the time the loop ended, so I needed to know while inside of the loop (which was more efficient than using JavaScript to change the tab's properties after the fact).
Ive been battling away with the following problem
Ive got a page where I pull names from players specific to their positions in a sport squad.
Example: I will display all the Wings in the squad using a dropdown where a coach can then pick his wing for the game.
There are dropdowns for each different position
The aim of the page is to let the coach quickly select his team for a fixture
After the coach selected his team he will, select the opponents for which the selected team will play against.
When he clicks submit the selected oppents and players will get stored in two arrays which will get called to display the team selected and their opponents on a new page. (After which it will get uploaded to the DB.)
I am having trouble getting the values from the select list to display on the new page.
I guess I have to do something like this on the new page:
foreach ($_REQUEST['opponents'] as $opponents){
print $opponents;
echo'<br>';
}
but it is not giving the desired results.
Strangely what gets printed is the variable name from the previous page select menu.
Upon further inspection I did a vardump on the new page and it says that $opponenets gets passed a value of string which is the variable name and not the value thereof?
My page looks like this
My question is how would I go abouts getting the values from the select dropdowns
if(isset($_POST["submit"]))
{
foreach ($_REQUEST['opponents'] as $against){
var_dump($against);
print $against;
echo'<br>';
}
}
else
{
echo'<h1>Select your Team</h1>';
$x = array("THP", "HKR", "LHP", "LH", "FLH"); //players positions gets assigned to x which will be used to query the database
echo '<form name="playerselect" method="post" action="">';
//query database with different query after each loop
for ($i = 0; sizeof($x) > $i; $i++)
{
//query where position field equeals variable x
$result = mysql_query("SELECT `name`, `position` FROM `player_info`
WHERE `position` = '$x[$i]'") or die(mysql_error()) ;
//Gets data from DB and assigns values to arrays below
while($row = mysql_fetch_array($result))
{
$playername[] = $row['name'];
$position[] = $row['position'];
}
//print player position
print $position[0];
echo'<br>';
//unset the array so that it is empty for the next query in the new loop
unset($position);
echo '<select name="players[]" >' ;
foreach ($playername as $name )
{
//Put playernames relevant to the position in the option element
echo'<option value="$name" selected="selected">'.$name;'</option>';
echo'<br>';
}
echo'</select>';
//unset array so that its contents is empty for the next query in the new loop
unset($playername);
echo'<br>';
}
You cannot. Your submit will only transmit select values. This is not a bug, it is a feature. You do not want to send data back and forth from/to the server/client which is known to both of them.
On the server you are free to query your database at any time. You can also cache your select list into the $_SESSION variable in your initial list read. However this is advanced fittling as your cache list may become outdated and also your server memory utilization must leave space for file caching (the SESSION cache goes to files).
If you go for the database query you may need some ID as sort of anchor. Just put the into the $_SESSION variable - eg.:
$_SESSION['positions']=$x;
In your example the $x seems to be static, which obviously reduces the need to cache it into the $_SESSION - however on other occasions you may need this method.
Say I have a query the following query run:
Edit
Added order clause because the real sql statement has one.
SELECT description, amount, id FROM table ORDER BY id
In this instance, the ID is not unique to the dataset. It would return something like this.
Description Amount ID
----------- ------ --
1 Hats 45 1
2 Pants 16 1
3 Shoes 3 1
4 Dogs 5 2
5 Cats 6 2
6 Waffles 99 3
What I need to do is enclose each section of IDs in it's own div (So rows 1,2,3 in one div, 4,5 in another div and 6 in it's own div).
There are tons of solutions to this but I just can't think of one that isn't overly complicated.
I want to be able to keep the SQL how it is and somehow sort the data set in PHP so that I can loop through each section of the dataset while looping through the dataset as a whole.
Some kind of array would work but the structure of it is stumping me.
How can I get this to work? PHP solutions would be idea but theoretical will help too.
See if something like this works for you.
// execute query: Select description, amount, id from table
$results = array();
while ($row = $query_result->fetch_array()) {
if (!isset($results[$row['id']])) $results[$row['id']] = array();
$results[$row['id']][] = $row; // push $row to results for this id
}
// later on
foreach($results as $id => $data) {
// output div based on $id
foreach($data as $datum) {
// output individual data item that belongs to $id
}
}
A simple serial solution might look something like this:
$curId = ''; // track working id
$firstDiv = true; // track if inside first div
// open first div
echo '<div>';
// foreach $row
{
// when id changes, transition to new div, except when in first div
if ($row->$id != $curId) {
if ($firstDiv) {
$firstDiv = false;
} else {
// start new div
echo '</div>';
echo '<div>';
}
$curId = $row->$id; // track new current id
}
// display contents of current row
}
// close last div
echo '</div>';
Just store the id in temp variable, if the next one is different close the div and open new div
Assuming associative arrays for the db results:
$final = array();
foreach($results as $result)
{
$final[$result['id']][] = $result;
}
This leaves you with an associative array $final that groups the entries by ID
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()) {