php bind_param for limit

Question

I have problem with binding values to mysql query in php.

$this->conn->prepare("SELECT * FROM tablename LIMIT ? , ? ");
$pageStart = 11; 
$pageEnd = 20 ;
$stmt->bind_param("ii" , $pageStart , $pageEnd );
$stmt->execute();

This is returning 20 rows. Any help?

Answer 1

This is correct behaviour.

From the documentation :

...
[LIMIT {[offset,] row_count | row_count OFFSET offset}]
...

the number after the comma is rowcount.

If you want 10 records, just tell that:

SELECT * FROM tablename LIMIT 11 , 10;

Answer 2

Query is executing correctly. Your parameters having incorrect values as per expected output.

If you want records from 11-20 query should be:

SELECT * FROM tablename LIMIT 11 , 10

as you are passing 20 as second parameter its returning 20 rows

You can use LIMIT offset, row_ count or LIMIT row_count OFFSET offset

See documentation http://dev.mysql.com/doc/refman/5.0/en/select.html

Answer 3

$pageStart = 11; Means the result start for 11 and $pageEnd = 20 ; means 20 result after 11

So you get 20 result now.

To get result up to 10 you need to set $pageEnd = 10. It will return you result 11 to 21

Answer 4

Regarding the names of your variables you should change

$stmt->bind_param("ii" , $pageStart , $pageEnd );

to

$stmt->bind_param("ii" , $pageStart , $pageEnd - $pageStart + 1);

because the second parameter of LIMIT is the amount of rows to be selected. The first parameter is the offset.