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- Patch #748340 by Berdir, andypost, catch, noahb, Crell: MySQL-optimized tableExists() implementation.

merge-requests/26/head
Dries Buytaert 2010-04-04 07:20:05 +00:00
parent 1c4ff2fc67
commit cb391a1856
1 changed files with 34 additions and 0 deletions
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34
includes/database/mysql/schema.inc
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@ -460,6 +460,40 @@ class DatabaseSchema_mysql extends DatabaseSchema {
return preg_replace('/; InnoDB free:.*$/', '', $comment);
}
public function tableExists($table) {
// The information_schema table is very slow to query under MySQL 5.0.
// Instead, we try to select from the table in question. If it fails,
// the most likely reason is that it does not exist. That is dramatically
// faster than using information_schema.
// @link http://bugs.mysql.com/bug.php?id=19588
// @todo: This override should be removed once we require a version of MySQL
// that has that bug fixed.
try {
$this->connection->queryRange("SELECT 1 FROM {" . $table . "}", 0, 1);
return TRUE;
}
catch (Exception $e) {
return FALSE;
}
}
public function fieldExists($table, $column) {
// The information_schema table is very slow to query under MySQL 5.0.
// Instead, we try to select from the table and field in question. If it
// fails, the most likely reason is that it does not exist. That is
// dramatically faster than using information_schema.
// @link http://bugs.mysql.com/bug.php?id=19588
// @todo: This override should be removed once we require a version of MySQL
// that has that bug fixed.
try {
$this->connection->queryRange("SELECT $column FROM {" . $table . "}", 0, 1);
return TRUE;
}
catch (Exception $e) {
return FALSE;
}
}
}
/**