public function getForeignKeyDDL(ForeignKey $fk)
{
if ($fk->isSkipSql()) {
return;
}
$pattern = 'CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s (%s)';
$script = sprintf($pattern, $this->quoteIdentifier($fk->getName()), $this->getColumnListDDL($fk->getLocalColumns()), $this->quoteIdentifier($fk->getForeignTableName()), $this->getColumnListDDL($fk->getForeignColumns()));
if ($fk->hasOnUpdate() && $fk->getOnUpdate() != ForeignKey::SETNULL) {
$script .= ' ON UPDATE ' . $fk->getOnUpdate();
}
if ($fk->hasOnDelete() && $fk->getOnDelete() != ForeignKey::SETNULL) {
$script .= ' ON DELETE ' . $fk->getOnDelete();
}
return $script;
}