如何在 PDO 中使用 FOUND_ROWS() 函数？

Question

当我使用mysql_query 时，我已经使用了FOUND_ROWS() 函数，如下所示：

$query = 'SELECT SQL_CALC_FOUND_ROWS * FROM Users';
mysql_query($query);
$query = 'SELECT FOUND_ROWS()';
mysql_query($query);

---

现在我使用 PDO，这是我的查询：

$sth = $this->dbh->prepare("SELECT SQL_CALC_FOUND_ROWS *,
                                   u.id user_id,
                                   u.avatar,
                                   u.date_time,
                                   CONCAT(u.user_fname, ' ', u.user_lname) name,
                                   sum($this->table_alias.vote_value) vote_value,
                                   sum($this->table_alias.score) score,
                                   $category_in_the_select AS tc $tag_in_the_select AS tt
                            FROM users u
                            JOIN reputations $this->table_alias ON u.id = $this->table_alias.owner_id $query_join
                            WHERE $time_limitation $query_where
                            GROUP BY user_id, u.avatar, u.date_time, name, tc, tt
                            ORDER BY score DESC, vote_value DESC
                            LIMIT :j, $this->per_page");
$this->parameters[":j"] = $j;
$sth->execute($this->parameters);
$users = $sth->fetchAll(PDO::FETCH_ASSOC);

如您所见，我在SELECT 语句中使用了SQL_CALC_FOUND_ROWS，我想知道如何使用FOUND_ROWS()？

Answer 1

您需要做的就是在原始执行后运行->query('SELECT FOUND_ROWS()')。

$sth = $this->dbh->prepare("SELECT SQL_CALC_FOUND_ROWS *,
                                   u.id user_id,
                                   u.avatar,
                                   u.date_time,
                                   CONCAT(u.user_fname, ' ', u.user_lname) name,
                                   sum($this->table_alias.vote_value) vote_value,
                                   sum($this->table_alias.score) score,
                                   $category_in_the_select AS tc $tag_in_the_select AS tt
                            FROM users u
                            JOIN reputations $this->table_alias ON u.id = $this->table_alias.owner_id $query_join
                            WHERE $time_limitation $query_where
                            GROUP BY user_id, u.avatar, u.date_time, name, tc, tt
                            ORDER BY score DESC, vote_value DESC
                            LIMIT :j, $this->per_page");
$this->parameters[":j"] = $j;
$sth->execute($this->parameters);
$users = $sth->fetchAll(PDO::FETCH_ASSOC);

$count = $this->dbh->query('SELECT FOUND_ROWS()')->fetchColumn();