Good afternoon lads, I am trying to make a page where I can check which bosses I did today. I have two tables (table with bosses and table with boss times). Now I need to show all bosses but for each of them I only want to show the closest time when the boss is going to spawn.
The select so far looks like that:
$timePlus = strtotime($currentTime) + 60*60*2.2;
$timePlusForm = date("H:i:s", $timePlus);
$userNametoLower = strtolower($userName);
$userTableName = "".$userNametoLower."_bosses";
$currentTime = date("H:i:s", time());
"SELECT `bossTime`.`ID`, `bossTime`.`bossID`, `bossTime`.`time`, `$userTableName`.`ID`, `$userTableName`.`name`,
`$userTableName`.`zone`, `$userTableName`.`map`, `$userTableName`.`waypointCode`, `$userTableName`.`bossDone`
FROM `bossTime` LEFT JOIN `$userTableName` ON `$userTableName`.`ID` = `bossTime`.`bossID`
WHERE `bossTime`.`time` BETWEEN '$currentTime' AND '$timePlusForm'
GROUP BY `bossTime`.`bossID`
ORDER BY `bossTime`.`time` ASC";
The problem is that this select does not pick the next closest value from time table. I also tried BETWEEN and it also didn't work (some bosses got correct closest time but other got the second closest). Any idea how to solve this is welcomed.
I removed GROUP BY and changed the condition to WHERE bossTime.time >= '$currentTime' AND bossTime.time <='$timePlusForm' and for some reason it works
I have three tables (I simplified it in this question) :
Table 1
id | Name
-----------
1 | John
2 | Smith
Table 2
id | Title
-----------
1 | Developer
2 | Web Developer
3 | A New Title
Table 3 (links between 1 and 2)
idName | idTitle
-----------
1 | 1
1 | 2
2 | 1
My problem is with the update page. My HTML is <select multiple> ... options ... </select> and I am using chosen to select and deselect options. I am trying to do this with PHP only.
Lets say that we have the following scenario:
The administrator wanted to remove the 'Developer' Title for 'John' and add 'New Title' for 'John'.
He/She will deselect Title id 1 and select id 3. When He/She submits the form I will get two select values: id 1 (the one that he selected) and id 2 (the one that was already there). But I will not get id 3 because he deselected it.
What I am struggling with is : when the user posted the new selected values the ones that were deselected were not submitted with the form. There is no way for me to track the ones that were deselected so I can delete them from my table. How do you update your table with the new changes then? Do you delete what is already existed in that table and add the ids again? Is there a better option?
UPDATE :
It seems #wander answer is less destructive than the other ones. However, #wonder did not explain how to compute step 4 in his answer. to distinguesh between new selected options, already existing selected options, and deselected options.
There's no need to submit the deselected one. e.g.
John has two titles(Developer and Web Developer) saved in database.
The administrator opens the page, selects 'New Title', deselects 'Developer' and clicks submit.
Now on server side, we can get
the title list of John stored in database: Developer and Web Developer
title list submitted from the users: Web Developer and New Title
We compare the two title lists and figure out: we shall delete Developer title and add New Title on John.
You could add hidden fields before the select menu which will cause 0/falsey values to also be sent to PHP.
<input type="hidden" name="stuff[]" value="0" />
<input type="hidden" name="stuff[]" value="0" />
<input type="hidden" name="stuff[]" value="0" />
<select multiple name="stuff[]">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
This is similar to how you would send unchecked check boxes to the server:
https://stackoverflow.com/a/1992745/268074 (note the answer without JS)
You can dump your old values in a hidden select, so you'll get them when handling your form.
<!-- Invisible select field -->
<select multiple name="oldData[]" style="display:none;" aria-hidden="true">
<option value="1">1</option>
<option value="2" selected>2</option>
<option value="3" selected>3</option>
</select>
<!-- Real select field -->
<select multiple name="data[]">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
Note: I was inspired by #Petah's answer, don't forget to upvote him :-).
Let's say we have $old_titles list with titles from db, and $new_titles titles from submit.
$add = array_diff($new_titles, $old_titles);
$delete = array_diff($old_titles, $new_titles);
$add - list of titles to add, $delete - list of titles to delete.
Add action:
$dbh->prepare('INSERT INTO table3(idName, idTitle) VALUES (:idName, :idTitle)');
foreach($add as $titleId) {
$dbh->execute(['idName' => $userId, 'idTitle' => $titleId]);
}
Delete action:
$dbh->prepare('DELETE FROM table3 WHERE idName = :idName AND idTitle = :idTitle');
foreach($delete as $titleId) {
$dbh->execute(['idName' => $userId, 'idTitle' => $titleId]);
}
Not sure why everybody keeps using hidden input fields to track the existing data. When you POST your form, you can just retrieve the original values from the database. That's a lot safer then depending on user input, because even hidden fields can be altered. I know it won't matter too much in this particular situation, but I think it's best to always use the best practise.
Now in PHP you have two options. The first would be to delete all relations and then add the new relations. The second would be to delete all that wasn't posted and add/update the relations that where.
Although the second options might seem to be the "least destructive" as you call it, it is the easiest and least error prone way. The only reason I would abandon this tactic is when I would store extra data in the relations table. EG: date added (when did somebody get into a function) or added by user.
How would you go about it (method 2)?
Keep in mind that I use a method that tries to continue whenever possible. Another approach would be to halt when false data is posted.
<?php
if (array_key_exists("relations",$_POST) && is_array($_POST["relations"])) {
//no duplicates, you dont want to store the same function twice
//only integers
$list = array_unique(array_filter($_POST["relations"], "is_int"));
$csv = implode(',', $list);
//get the userid hoewever you normally would
$userId = 1
//Delete existing
$query = "DELETE FROM Table3 WHERE idname=".$userId
//insert all posted functions
//I select the id's from the actual table so it will never inserted a none existing ID.
//this approach never has duplicates, so the duplicate check in the beginning is redundant now, but I leave it incase I change this.
$query = "INSERT INTO Table3 (idName, idTitle) SELECT ".$userId.", Id FROM Table2 WHERE id IN (".$csv.")".
//execute queries
} else {
//nothing posted, delete all relations
}
?>
Now if you only want to insert new data and remove none-existing
<?php
if (array_key_exists("relations",$_POST) && is_array($_POST["relations"])) {
//no duplicates, you dont want to store the same function twice
//only integers
$list = array_unique(array_filter($_POST["relations"], "is_int"));
$csv = implode(',', $list);
//get the userid hoewever you normally would
$userId = 1
//Delete existing
$query = "DELETE FROM Table3 WHERE idname=".$userId." AND idTitle NOT IN (".$csv.")"
//only insert new functions
//I select the id's from the actual table so it will never inserted a none existing ID.
//this approach never has duplicates, so the duplicate check in the beginning is redundant now, but I leave it incase I change this.
$query = "INSERT INTO Table3 (idName, idTitle) SELECT ".$userId.", Id FROM Table2 WHERE id IN (".$csv.") AND id NOT IN (SELECT idTitle FROM table3 WHERE idName=".$userId.")".
//execute queries
} else {
//nothing posted, delete all relations
}
?>
The only better way is the simplest one, remember KIS
on update you just need to do following
DELETE FROM table3 WHERE idName=??
and then insert all selected idTitles again in table3
This can be done in two SQL statement without knowing which value has been de-selected. Following these 2 steps
1) In your PHP, create a comma separated list of all selected option. For example: 2, 3.
2) Then execute the following statements:
DELETE FROM tblLink WHERE idName = $id AND idTitle NOT IN ($list);
INSERT IGNORE tblLink (idName, idTitle)
SELECT $id, id FROM tblTitle WHERE id IN ($list);
Note: for shake of simplification, I use $id and $list in my example. When you intent to use it, you should properly prepare and bind parameter properly. Make sure that idName and idTitle are primary key to make it work.
To my opinion you have to check what actions should be performed first. This is a small example that you can run here http://sandbox.onlinephpfunctions.com/code/0fa11b3c9f846e344c912f5a3e994eea5e9cac34.
First run a select on Table 3 for idName=1 the output would be an array of idTitle's (1,2). In the following example the $array1 is the output of such a select statement and $array2 is the array of new idTitle's for the same idName that will have to be updated or deleted or inserted. If for example the new idTitles for a user are more or less than the previous ones then there you should have some sort of control over it in order to decide what queries you will run to the database.
$array1 = array(1,7,3,5);// initial idTitles try it on the above link (php sandbox) with more or less values
$array2 = array(1,4,3,6);//new idTitles try it on the above link (php sandbox) with more or less values
$count1=count($array1);
$count2=count($array2);
$diff=$count1-$count2;
if ($diff==0) {
$result1=array_values(array_diff_assoc($array2,$array1));
$result2=array_values(array_diff_assoc($array1,$array2));
$countr=count($result1);// or $result2 it is the same since they have the same length
$cr=0;
while($cr < $countr) {
print_r("update tblname set val=$result1[$cr] where id=theid and val=$result2[$cr]\n");
$cr++;
}
}
if ($diff!=0) {
$result1=array_diff($array2,$array1);
$result2=array_diff($array1,$array2);
if(count($result2)>0) {
foreach($result2 as $r2) {
print_r("delete from tblname where id=theid and val=$r2\n");
}
}
foreach($result1 as $r1) {
print_r("insert into tblname where id=theid and val=$r1\n");
}
}
How I would do it would extend the 1st table
id | Name | Title IDs
1 | John | 1,2
2 | Smith | 1,3
Each time the row is updated I would simply just replace the title_ids fields and be done with it.
I'm fetching data with PDO from a table containing 2 fields : comment and date.
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
extract($row);
echo $comment;
echo $date;
}
Which displays a list of all comments.
Now I'm trying to group these comments by month, the main goal is to create some filter menu with a GET value so that only the current month comments are displayed :
<ul>
<li>October 2014</li>
<li>November 2014</li>
<li>December 2014</li>
</ul>
I think I should be fine with the LIKE operator for displaying the results, but what about the menu links generation ?
Main issue : $date is in d/m/Y format, so I have to process before using it :
$created = $date;
$month = $created->format('mY');
Also I can't really know in advance which months are going to be registered in the table, so it have to be "dynamic".
So how do I get a list of every month appearing in the table ? Without redundancy of course. Like
1014
1114
1214
even if there is numerous comments created on October for instance.
You can use MySQL's STR_TO_DATE and DATE_FORMAT functions to return the date in the format you need. For example:
SELECT `comment`, DATE_FORMAT(STR_TO_DATE(`date`, "%d/%m/%Y"), "%m%y") as `date2` FROM `data`
If you need to query all the unique month/year combinations, use DISTINCT:
SELECT DISTINCT DATE_FORMAT(STR_TO_DATE(`date`, "%d/%m/%Y"), "%m%y") as `date2` FROM `data`
Here's a SQL fiddle showing the distinct select.
I am in the beginning of building a simple absence script for teachers to administrate students.
I need to populate the same list of students in 5 tables. One table for each day of the current week (monday to friday).
I have the following code at the moment
List students SQL query:
SELECT s.student_id, s.student_firstname, s.student_lastname,
a.student_absence_startdate, a.student_absence_enddate, a.student_absence_type
FROM students s
LEFT JOIN studentabsence a ON a.student_id = s.student_id
WHERE a.student_absence_startdate
IS NULL OR
'2012-06-20'
BETWEEN
a.student_absence_startdate AND a.student_absence_enddate
This query selects all students and joins another table wich is a linking table that holds the absence information for students.
I the populate the code 5 times like this:
<?php
$data = array();
while ($row = mysql_fetch_array($list_students)) {
$data[] = $row;
}
?>
<table>
<?php
foreach($data as $row){
$class = "";
if ($row['student_absence_type'] == 2) {$class = " style='background:#f00;'";}
else if ($row['student_absence_type'] == 3) {$class = " style='background:#8A2BE2;'";}
echo "<tr><td$class>";
echo "<a class='ajaxlink' href='#' rel='pages/ajaxAbsence.php?student_id=".$row['student_id']."'>".$row['student_firstname']." ".$row['student_lastname']."</a>";
echo "</td></tr>\n";
}
?>
</table> <!-- Repeat -->
My question is how I should manage the date functions.
As you can see in my SQL query I have hardcoded the dates. I need it to automatically select the date of wich table the students are listed.
for example:
table > Monday (2012-07-23)
the user John Doe has absence information in this span, based on the above query. Let's change the background of <td>
table > Tuesday (2012-07-24)
the user John Doe has no absence information in this span. Just list him.
etc...
I am not expecting you to write my code. I am just curious on how to think. I am fairly new to programming.
The most flagrant error I find in your thoughts is that you don't need those five tables. You'll end up repeating and messing data.
You need different tables, from what I've read.
Students
ID, Name, etc..
Classes
class_id, name,
Teachers
Id_teacher, name, etc
TeachersInClass (so you can now which teachers gave a specific class)
id, id_teacher, id_class
Absences
id, id_student, id_class, date
This leaves you a more robust database, and you can play arroud with multiple associations like, which teachers had the most absences in a year... etc etc.
EDIT: Forgot to answer your "real" question.
You can use the PHP DateTime class to manipulate your dates. It's easy to use, and the php.net has a lot of good examples to give you a boost start
I have a table that has patient information (name, dob, ssn, etc.) and a table that has lists of medications that they take. (aspirin, claritin, etc.) The tables are related by a unique id from the patient table. So, it's easy enough to pull all of Mary Smith's medications.
But, what I need to do is to show a paginated list of patients that shows their name, other stuff from the patient table and has a column with a line-separated list of their medications. Roughly, this:
If I do a simple left join, I get 3 repeated rows of Mary Smith with one medication per row.
The patient table can have thousands of records, so I don't want to do a query to get all the patients and then loop through and get their meds. And, because it's paginated based on patient, I can't figure out how to get the correct number of patients for the page, along with all their medications.
(The patients/medications thing is just a rough example of the data; so please don't suggest restructuring how the data is stored.)
GROUP_CONCAT to the rescue!
SELECT patients.first_name, patients.last_name, GROUP_CONCAT(prescriptions.medication SEPARATOR ", ") AS meds FROM patients LEFT JOIN prescriptions ON prescriptions.patient_id = patients.id GROUP BY patients.id;
You've got a few choices.
rowspan clauses with one drug per cell per user. You'd need to run two SQL queries to precalculate how big each user's span would have to be, or suck the query results into PHP and do the counting there.
Simple state machine - start a new row each time the user changes, then just keep adding more drug names seperated with <br /> while the user's name stays constant.
The second one's probably easiest:
$previous_name = null;
$first = true;
echo "<table";
while($row = mysql_fetch_assoc($results)) {
if ($row['name'] <> $previous_name) {
if (!$first) {
echo "</td></tr>"; // end previous row, if it's not the first row we've output
$first = false;
}
echo "<tr><td>$row[name]</td><td>"
$previous_name = $row['name'];
}
echo "$row['drug']<br />";
}
echo "</td></tr></table>";
I think what you are looking for is referred to a 'concation of subquery'.
Check http://forums.mysql.com/read.php?20,157425,157796#msg-157796 and http://mysql.bigresource.com/SELECT-CONCAT-Subquery-S5cIpzqO.html