What I am trying to do is:
I have a table called Stations, and it has 100 columns. I want to select all records from Stations and randomly select 1 record and echo the random record.
Here is what I have got so far:
<?PHP
$connect = mysql_connect("***", "****", "****") or die("Connection Failed");
mysql_select_db("***");
$query = mysql_query("SELECT * FROM Stations ORDER BY RAND() LIMIT 1");
WHILE($rows = mysql_fetch_array($query)):
$Station = $rows['Station1'];///seems it will only show Station1 Column I have Station1 to Station100 was not sure how to add rest of Stations
endwhile;
?>
Since you're limiting the result set to only one row, you don't need that while() loop. Just fetch the row from the result set and use it afterwards, like this:
$rows = mysql_fetch_array($query);
Now comes to your question,
... it will only show Station1 Column I have Station1 to Station100 was not sure how to add rest of Stations
To display all hundred column values, it's better to use a for loop like this,
for($i = 1; $i <= 100; ++$i){
// display $rows['Station' . $i] as per your choice. Below is one way.
echo $rows['Station' . $i] . '<br />';
}
Update:
From your comment,
... I need it to randomly choose 1 value out of all 100 columns and echo that value please
After fetching the row from the result set, use array_rand() function to get a random key out of the array, and then use that key to display the column value, like this:
$randKey = array_rand($rows);
echo $rows[$randKey];
Sidenote: Don't use mysql_* functions, they are deprecated as of PHP 5.5 and are removed altogether in PHP 7.0. Use mysqli or PDO extensions instead. Also read, why shouldn't I use mysql_* functions in PHP?.
Related
In my mysql tables I have for example a row that holds values, lets call this table "days" and the row "haircuts".
So I have 5 rows all with "1","2","3","4","5" under "haircuts". What I want to do, in php, is add them all together and echo. So it would maybe look like this:
echo "Total haircuts: ",$haircuts;
Which would hopefully show:
Total haircuts: 15
I can't figure out how, though. Here's how I'm currently doing it.
$getstats = mysqli_query($con,"SELECT * FROM stats");
$gotstats = mysqli_fetch_array($getstats);
$haircuts = $gotstats['haircuts'];
But it only echoes the "haircuts" of the first row? :(
I have multiple columns I would like to total and echo too if that is possible?
You can use the MySQL statment SUM in your query, just change your code by this one:
$getstats = mysqli_query($con,"SELECT SUM(haircuts) AS totalhaircuts FROM stats");
$gotstats = mysqli_fetch_array($getstats);
$totalhaircuts = $gotstats['totalhaircuts'];
echo "Total haircuts: ",$totalhaircuts;
You probably should use MySQL SUM().
SELECT SUM(haircuts) as tot_cuts FROM stats;
$gotstats['tot_cuts'];
You need to use loop for getting all rows. Example:
$getstats = mysqli_query($con,"SELECT * FROM stats");
while($gotstats = mysqli_fetch_array($getstats)){
$haircuts = $gotstats['haircuts'];
echo $haircuts . '<br />';
}
I have to identify unsaved value from mysql table using php and mysql, for example i using table named as numtab and i have already stored some numbers 1, 3, 4, 7, 23, 12, 45 in numb column.
now i have generated one new number randomly(for example 23) and i have to check this number with already stored numbers,
if 23 is exist in the table mean i have to generate another one new number and have to check once again with stored values, this process have to continue till finding unsaved number.
if generated value is not exist in table mean can stop the process and can store this number in table.
here below the format i am currently using
$numb=23;
$qryb="select * from numtab where numb='$numb'";
$results=mysql_query($qryb)or die("ERROR!!");
if(mysql_num_rows($results) == 1)
{
$numb=rand(1,100);
mysql_query("insert query");
}
the problem is above the code is validation once only, its not verifying second time. i think if using for or while loop mean can solve this problem, but i dont know how to do looping, so help me to solve this problem.
You can use in clause like this :
$qryb="select * from numtab where numb in('$numb')";
$results=mysql_query($qryb)or die("ERROR!!");
$count = mysql_num_rows($results);
if ($count > 0) {
echo "number exist in db";
} else {
echo "number does not exist in db";
}
You could make a while() loop to check if the numbers exist in your database. You could also retrieve all numbers from the database, store them in an array and check if the generated number exists within that array.
The first option would be something like this:
do {
$numb=rand(1,100);
$qryb="select * from numtab where numb='$numb'";
$results = mysql_query($qryb) or die("ERROR!!");
} while(mysql_num_rows($results) >= 1)
mysql_query("insert query");
The second option would be something like this:
$query = mysql_query("SELECT DISTINCT(numb) as numb FROM numtab");
// set array
$array = array();
// look through query
while($row = mysql_fetch_assoc($query)){
// add each row returned into an array
$array[] = $row['numb'];
}
do
{
$numb = rand(1,100);
}
while(!in_array ( $numb , $array) ;
mysql_query("insert query");
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).
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.