Re: [PHP] finding a particular record within a MySQL result set
On Wed, April 4, 2007 12:07 pm, James Tu wrote: I've cross posted this to the MySQL list... Here's my original post. Is there some quick way to do the following in MySQL? (I know I can use PHP to search through the result set, but I wanted to see if there's a quick way using some sort of query) Let's say I know that Joe is from Maine. I want to do a query of all employees from Maine, ordered by hiring date, and figure out where Joe falls in that list. (i.e. which record number is he?) -James Here's my new plan of attack... Right now I'm trying to use PHP to do a binary search on the result set so I don't have to traverse the entire result set. I'm using PHP's mysql_data_seek() to move the pointer within the result set and looking at the data to do the necessary comparisons. What do people think of this approach? It will probably be slow if you have many records in result set. In what way is it even meaningful to figure out where Joe falls in the list?... Whatever it means, and whatever that is for, it ought to be stored in the DB in the first place, probably... Or you're just plain breaking good practices in a Big Way that will hurt you later. Hard to tell... -- Some people have a gift link here. Know what I want? I want you to buy a CD from some indie artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] finding a particular record within a MySQL result set
I've cross posted this to the MySQL list... Here's my original post. Is there some quick way to do the following in MySQL? (I know I can use PHP to search through the result set, but I wanted to see if there's a quick way using some sort of query) Let's say I know that Joe is from Maine. I want to do a query of all employees from Maine, ordered by hiring date, and figure out where Joe falls in that list. (i.e. which record number is he?) -James Here's my new plan of attack... Right now I'm trying to use PHP to do a binary search on the result set so I don't have to traverse the entire result set. I'm using PHP's mysql_data_seek() to move the pointer within the result set and looking at the data to do the necessary comparisons. What do people think of this approach? -James -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] finding a particular record within a MySQL result set
I've cross posted this to the MySQL list... Here's my original post. Is there some quick way to do the following in MySQL? (I know I can use PHP to search through the result set, but I wanted to see if there's a quick way using some sort of query) Let's say I know that Joe is from Maine. I want to do a query of all employees from Maine, ordered by hiring date, and figure out where Joe falls in that list. (i.e. which record number is he?) -James Here's my new plan of attack... Right now I'm trying to use PHP to do a binary search on the result set so I don't have to traverse the entire result set. I'm using PHP's mysql_data_seek() to move the pointer within the result set and looking at the data to do the necessary comparisons. What do people think of this approach? You will probably get a better approach from the mysql list, but from a PHP solution perspective, I'd load up an array with the result set and use key() to get the number. The example at http://php.net/key does exactly that. JM -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] finding a particular record within a MySQL result set
You will probably get a better approach from the mysql list, but from a PHP solution perspective, I'd load up an array with the result set and use key() to get the number. The example at http://php.net/key does exactly that. Or array_search() :) JM -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] finding a particular record within a MySQL result set
I've looked at those, but both approaches requires traversing through the entire mysql result set to create another array ( could be memory intensive if the result set is large...100,000 ? ) -James On Apr 4, 2007, at 1:39 PM, Jim Moseby wrote: You will probably get a better approach from the mysql list, but from a PHP solution perspective, I'd load up an array with the result set and use key() to get the number. The example at http://php.net/key does exactly that. Or array_search() :) JM -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] finding a particular record within a MySQL result set
I've looked at those, but both approaches requires traversing through the entire mysql result set to create another array ( could be memory intensive if the result set is large...100,000 ? ) -James I agree. That's why I said the mysql group will give you better answers. Really, the best solution is to just get your answer from mysql. I am 100% sure you can forge an SQL query or series of queries that will return the number you want. JM -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] finding a particular record within a MySQL result set
2007/4/4, James Tu [EMAIL PROTECTED]: I've cross posted this to the MySQL list... Here's my original post. Is there some quick way to do the following in MySQL? (I know I can use PHP to search through the result set, but I wanted to see if there's a quick way using some sort of query) Let's say I know that Joe is from Maine. I want to do a query of all employees from Maine, ordered by hiring date, and figure out where Joe falls in that list. (i.e. which record number is he?) -James Here's my new plan of attack... Right now I'm trying to use PHP to do a binary search on the result set so I don't have to traverse the entire result set. I'm using PHP's mysql_data_seek() to move the pointer within the result set and looking at the data to do the necessary comparisons. What do people think of this approach? -James -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php There is a previous thread in this list regarding the same topic: http://marc.info/?t=11668863811 This is the solution I've used for this kind of problems, and posted as a response to that thread: http://marc.info/?m=116697534311544
