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Say that you want to retrieve a list, formatted for display, of all a user s friends who have birthdays in the next three months Listing 166 shows how to write that queryWe use the FQL concat() function to create a formatted string of the user s name and birthdayWe use the FQL substr() function to get the month from first two characters of the birthday_date field, which is always formatted mm/dd/yyyyWe subtract the current month number and constrain our results to when that value is greater than 3
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Listing 166 Accessing Subfields Directly
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SELECT concat( name, " - ",birthday ) FROM user WHERE uid IN ( SELECT uid2 FROM friend WHERE uid1 = $userID ) AND ( substr( birthday_date, 0, 2 ) - $currentMonthNumber ) >= 3
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One of the problems with the standard FQL query is that that subqueries cannot reference the outer queryThis often means that you have to use multiple queries to get the data you needThe fqlmultiquery() function lets you pass all these queries to be executed in one call, and each query can reference the otherThis method takes a JSONencoded array of queries, each with its own name Queries use the same format as the normal fqlquery() method, except you can now reference the results of other queries using their name in the FROM clause For example, if you want to get both tagged photos and recent links for all app user friends, you can call fqlmultiquery(), as demonstrated in Listing 167We create a query for the commonly used app user friends query called appfriendsThis query is used as the pool of UIDs for the other two queries, referencing it like we do here, with the query name preceded by a #:
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SELECT uid FROM #friends
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Listing 167
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$queries = '{ "appfriends":"SELECT uid FROM user WHERE uid IN ( SELECT uid2 FROM friend WHERE uid1 = 698700806 ) AND is_app_user = 1", "taggedPhotos":"SELECT pid FROM photo_tag WHERE subject IN ( SELECT uid FROM #friends ) LIMIT 10", "links":"SELECT link_id FROM link WHERE owner IN ( SELECT uid FROM #friends ) LIMIT 10"}'; $appUsers = $facebook->api_client->fql_multiquery( $queries );
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The PHP client library s fql_multiquery() function returns the result of each query in an array, as shown in Listing 168
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Listing 168 PHP Client Library fql_multiquery() Results
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array 0 => array 'name' => string 'appfriends' (length=7) 'fql_result_set' => array 0 => array 'uid' => string '698700806' (length=12) 1 => array 'name' => string 'links' (length=5) 'fql_result_set' => array 0 => array 'link_id' => string '122217238584' (length=12)
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The fqlmultiquery() function performs faster than using several individual fqlquery() calls, even if those calls are batched using the batching API
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If your application canvas pages end up using the same queries (or API calls that ultimately call them) each time they are loaded, you can tell Facebook to automatically run those queries before calling your page and pass you the resultsAlthough this doesn t reduce the FQL query time, it does remove the round-trip time those queries take if they are executed via fqlquery() calls
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This feature is still in beta, but it has been used for a while now by many developers It was also used for one of the biggest applications on Facebook, Top Friends
This preloading is achieved through the user of the adminsetAppProperties() API functionThis function is not called during the normal operation of an application, but as a set up mechanism, much like registering Feed Template bundlesWe will set the preload_fql property, passing in an array of rules Each rule is composed of three parts: the name, the pattern, and the query:
Name is a user-defined name to apply to this ruleThis name is used as part of a POST variable passed to the application canvas page Pattern is a regular expression that matches the canvas pages to which this should be sentThe entire URL is available, so you can match individual files, entire directories, or the entire site Query is an FQL statement to be executed It can be parameterized to use the value of any GET parameter and can use a special parameter, {*user*}, which is the active user
Let s use our app user friends query as an example Listing 169 shows how to create a rule and pass it to adminsetAppProperties()We set the name to appfriends and our pattern to match all pagesThe query is the same one we have been using, except we use the {*user*} token for the active userWe use json_encode() to make sure that the regular expressions are escaped properly and convert the array to the string format that the API call expects If we want to use a GET parameter called UID instead of the active user for the query, we just replace the curly braces with {UID}
Listing 169 Preloading FQL Using adminsetAppProperties()
$rules = json_encode( array("appfriends" => array("pattern" => "*", "query" => "SELECT uid FROM user WHERE uid IN ( SELECT uid2 FROM friend WHERE uid1 = {*user*} ) AND is_app_user = 1"))); $facebook->api_client->admin_setAppProperties(array("preload_fql" => $rules)));
After this code is executed, Facebook changes what it sends to your application in the variablesThis differs between FBML and IFrame canvas pages, so we start with what happens with FBML canvas pages First, Facebook no longer sends the fb_sig_friends variable If you depend on this list of all the user s friends, you need to add another rule for it, like this:
POST array("friends" => array("pattern" => "*", "query" => "SELECT uid2 FROM friend WHERE uid1 = {*user*}"))