MySQL::DeleteRows PHP Method

    public function DeleteRows($tableName, $whereArray = null)
    {
        $this->ResetError();
        if (!$this->IsConnected()) {
            $this->SetError("No connection");
            return false;
        } else {
            $sql = self::BuildSQLDelete($tableName, $whereArray);
            // Execute the UPDATE
            if (!$this->Query($sql)) {
                return false;
            } else {
                return true;
            }
        }
    }

 /**
  * Set the groups in which the user is a member in.
  * @param int $userId   id of the user
  * @param array $groups  map from group ID to membership role ID
  * @return false|null       true on success, false on failure
  * @author sl
  */
 public function setGroupMemberships($userId, array $groups = null)
 {
     $table = $this->getGroupsUsersTable();
     if (!$this->conn->TransactionBegin()) {
         $this->logLastError('setGroupMemberships');
         return false;
     }
     $data['userID'] = MySQL::SQLValue($userId, MySQL::SQLVALUE_NUMBER);
     $result = $this->conn->DeleteRows($table, $data);
     if (!$result) {
         $this->logLastError('setGroupMemberships');
         if (!$this->conn->TransactionRollback()) {
             $this->logLastError('setGroupMemberships_rollback');
         }
         return false;
     }
     foreach ($groups as $group => $role) {
         $data['groupID'] = MySQL::SQLValue($group, MySQL::SQLVALUE_NUMBER);
         $data['membershipRoleID'] = MySQL::SQLValue($role, MySQL::SQLVALUE_NUMBER);
         $result = $this->conn->InsertRow($table, $data);
         if ($result === false) {
             $this->logLastError('setGroupMemberships');
             if (!$this->conn->TransactionRollback()) {
                 $this->logLastError('setGroupMemberships_rollback');
             }
             return false;
         }
     }
     if (!$this->conn->TransactionEnd()) {
         $this->logLastError('setGroupMemberships');
         return false;
     }
     return true;
 }