/**
* Gets the select object to be used by the validator.
* If no select object was supplied to the constructor,
* then it will auto-generate one from the given table,
* schema, field, and adapter options.
*
* @return DBSelect The Select object which will be used
*/
public function getSelect()
{
if (null === $this->_select) {
$db = $this->getAdapter();
/**
* Build select object
*/
$select = new DBSelect($db);
$select->from($this->_table, array($this->_field), $this->_schema);
// Support both named and positional parameters
if ($db->supportsParameters('named')) {
$select->where($db->quoteIdentifier($this->_field, true) . ' = :value');
} else {
$select->where($db->quoteIdentifier($this->_field, true) . ' = ?');
}
if ($this->_exclude !== null) {
if (is_array($this->_exclude)) {
$select->where($db->quoteIdentifier($this->_exclude['field'], true) . ' != ?', $this->_exclude['value']);
} else {
$select->where($this->_exclude);
}
}
$select->limit(1);
$this->_select = $select;
}
return $this->_select;
}
/**
* Run query and returns matches, or null if no matches are found.
*
* @param String $value
* @return Array when matches are found.
*/
protected function _query($value)
{
/**
* Check for an adapter being defined. if not, fetch the default adapter.
*/
if ($this->_adapter === null) {
$this->_adapter = AbstractTable::getDefaultAdapter();
if (null === $this->_adapter) {
throw new Exception\RuntimeException('No database adapter present');
}
}
/**
* Build select object
*/
$select = new DBSelect($this->_adapter);
$select->from($this->_table, array($this->_field), $this->_schema)
->where($this->_adapter->quoteIdentifier($this->_field, true).' = ?', $value);
if ($this->_exclude !== null) {
if (is_array($this->_exclude)) {
$select->where($this->_adapter->quoteIdentifier($this->_exclude['field'], true).' != ?', $this->_exclude['value']);
} else {
$select->where($this->_exclude);
}
}
$select->limit(1);
/**
* Run query
*/
$result = $this->_adapter->fetchRow($select, array(), Db::FETCH_ASSOC);
return $result;
}