Re: [GENERAL] PHP and Postgres arrays
Le vendredi 18 janvier 2008 à 23:10 +0100, Ivan Sergio Borgonovo a écrit : On Fri, 18 Jan 2008 23:01:09 +0100 Yannick Warnier [EMAIL PROTECTED] wrote: Hello, I've been searching (not very thoroughly, but still) for a way to get Postgres arrays right into PHP arrays, but it seems that the Postgres driver simply doesn't allow that. What about using a stored procedure to return the array as a joined row? I thought about it, but it's not very portable if you want to ship a PHP application. But I admit I will fall back to that solution if I cannot find any other (considering PostgreSQL might be the only open-source database to offer in-fields arrays anyway). Yannick ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
[GENERAL] PHP and Postgres arrays
Hello, I've been searching (not very thoroughly, but still) for a way to get Postgres arrays right into PHP arrays, but it seems that the Postgres driver simply doesn't allow that. The only solution seems to use some user-defined functions[1] to split the result of a query (a string) into a PHP array. Some Perl-related readings [2] seem to say that Postgres actually provides a string, loosing the possibility to get it as an array, but these comments date back to 2005. Any chance someone around here might tell me more about this and possibly give me some better way to get those arrays than copy-pasting the user-proposed PHP functions? Thanks, Yannick Warnier [1] http://www.php.net/manual/en/ref.pgsql.php#58660 [2] http://www.perlmonks.org/?node_id=474518 ---(end of broadcast)--- TIP 6: explain analyze is your friend
[GENERAL] GiST and Gin technical doc
Hi there, I'm having trouble finding technical documentation about GiST, Gin and TSearch2. I am particularly interested in the internal data structure of a GiST-ed or Gin-ed index, and the availability of searches by proximity. Does anyone know of a good place to find such doc, outside from the source code (I'm not too much into C/C++)? Thank you, Yannick ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [GENERAL] People near me query
Le ven 19/03/2004 à 11:05, David Garamond a écrit : Imagine an Orkut-like site. Suppose we have 'person' table of 100k people. About 75% of these people fill in their location (City/State/Country) information. We also have a 'city' table containing list of cities with their state country and each city's latitude/longitude. Assume all people's location is registered in the 'city' table. How does one design a database to be able to process Show me people that live no farther than 250 miles from where I live quickly? I can do Show me people that live within (A-X to A+X) latitude and (B-X to B+X) longitude though. (Where A and B is the latitude and longitude [of the person], and X is some numeric value. Hi David, I think the answer depends on the precision you want. Reading your post, it doesn't seem to me you need a lot of precision. Usually your technique could do for an approximation. If you want to be more precise though, you would have to use a completely different calculation or structure. Did you think about the fact that longitude is different in terms of distance if you look it from here or from the equator? Also, using a difference in terms of longitude and latitude just by making a subtraction will give you persons which are actually located at more than sqrt(2) times 250 miles. Making it 350 miles sometimes (and that's still flying like a bird). A more precise way of doing this would be to keep a table with distances between cities, and then calculate your way to your destination by taking the shorter path (and that's only a question of distance, not time)... That's really a lot more calculations. It depends on what you need. Yannick ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
