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ENHANCEMENT: constraint queries are now cached

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This commit is contained in:
Geoff Munn 2010-11-01 01:11:31 +00:00
parent a59e02efee
commit f3e29be23c
1 changed files with 23 additions and 5 deletions
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28
code/PostgreSQLDatabase.php
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@ -63,6 +63,16 @@ class PostgreSQLDatabase extends SS_Database {
*/
public static $check_database_exists = true;
/**
* This holds a copy of all the constraint results that are returned
* via the function constraintExists(). This is a bit faster than
* repeatedly querying this column, and should allow the database
* to use it's built-in caching features for better queries.
*
* @var array
*/
private static $cached_constraints=array();
/**
* Connect to a PostgreSQL database.
* @param array $parameters An map of parameters, which should include:
@ -887,12 +897,20 @@ class PostgreSQLDatabase extends SS_Database {
}
/**
* Find out what the constraint information is, given a constraint name.
* We also cache this result, so the next time we don't need to do a
* query all over again.
*
* @param string $constraint
*/
function constraintExists($constraint){
$exists=DB::query("SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname='$constraint' ORDER BY 1;")->first();
if(!isset(self::$cached_constraints[$constraint])){
$exists=DB::query("SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname='$constraint' ORDER BY 1;")->first();
self::$cached_constraints[$constraint]=$exists;
}
//echo "SELECT conname,pg_catalog.pg_get_constraintdef(r.oid, true) FROM pg_catalog.pg_constraint r WHERE r.contype = 'c' AND conname='$constraint' ORDER BY 1;<Br>";
return $exists;
return self::$cached_constraints[$constraint];
}
/**
@ -1785,4 +1803,4 @@ class PostgreSQLQuery extends SS_Query {
}
?>
?>