Random Number in MySqli Update Query - php

Question

I am android developer and have not much knowledge of php. currently I am working for make backend of my android application. I have quote table with about 1000 row in it. I am trying to update some row with below query.
$randomnumbershare = (rand(10,50));
$randomnumberlike = (rand(10,50));
$results = mysqli_query($mysqli,"UPDATE tbl_quotes SET qu_status=0, qu_like=$randomnumberlike,qu_share=$randomnumbershare,qu_favorite=0, qu_time=Now() ORDER BY _quid ASC ");
I want set qu_like and qu_share with random number from 10 to 50. its working fine but have only one issue that it's setting same number in all row, instead I want different number in all row. Anyone can please suggest me how can I do it ?
Thanks

Answer 1

The problem is you don't have a where clause, that means that the update is going to update all the rows in the table, if you want to have different values you need to do the update inside a for or while statement to repeat the update and add a where clause that matches every id of the table on every cicle.
Now you have this:
$randomnumbershare = (rand(10,50));
$randomnumberlike = (rand(10,50));
$results = mysqli_query($mysqli,"UPDATE tbl_quotes SET qu_status=0, qu_like=$randomnumberlike,qu_share=$randomnumbershare,qu_favorite=0, qu_time=Now() ORDER BY _quid ASC ");
But you need something like:
If you have a numeric id that goes from 1 to 1000 you can do something like
for ($x = 1; $x <= 1000; $x++)
{
$randomnumbershare = (rand(10,50));
$randomnumberlike = (rand(10,50));
$results = mysqli_query($mysqli,"UPDATE tbl_quotes SET qu_status=0, qu_like=$randomnumberlike,qu_share=$randomnumbershare,qu_favorite=0, qu_time=Now() where id=$x ORDER BY _quid ASC ");
}
That code do your update 1000 times, one update for each row you have in you table, now if you have a varchar id that is somethin more complex than a numeric sequence you need to add a query before that stores that ids into an array, something like:
$sql = mysql_query("select id from table_name");
$tableinfo = array();
foreach ($tableinfo as $tableid)
{
$randomnumbershare = (rand(10,50));
$randomnumberlike = (rand(10,50));
$results = mysqli_query($mysqli,"UPDATE tbl_quotes SET qu_status=0, qu_like=$randomnumberlike,qu_share=$randomnumbershare,qu_favorite=0, qu_time=Now() where id=$tableid[id] ORDER BY _quid ASC ");
}
For n number of row thinking you have a sequence from 1 to x number you can do:
$sql = mysql_query("select id from table_name");
$num_rows = mysql_num_rows($sql);
for ($x = 1; $x <= $num_rows; $x++)
{
$randomnumbershare = (rand(10,50));
$randomnumberlike = (rand(10,50));
$results = mysqli_query($mysqli,"UPDATE tbl_quotes SET qu_status=0, qu_like=$randomnumberlike,qu_share=$randomnumbershare,qu_favorite=0, qu_time=Now() where id=$x ORDER BY _quid ASC ");
}