php - PDO 联盟计数

Question

public function totalRecords($keyword) {
    $sql = "SELECT COUNT(uid) FROM user_information WHERE title LIKE ? OR name LIKE ? OR surname LIKE ? 
          UNION ALL
          SELECT COUNT(id) FROM groups WHERE name LIKE ?";
    $query = $this->db->prepare($sql);
    $query->execute(array("%$keyword%", "%$keyword%", "%$keyword%", "%$keyword%"));
    return $query->rowCount();
}

我正在尝试创建寻呼机，我需要对搜索词条进行总记录。

上面的代码不起作用，它总是返回 0。我该怎么做？

Answer 1

rowCount()

PDOStatement::rowCount() returns the number of rows affected by the last DELETE, INSERT, or UPDATE statement executed by the corresponding PDOStatement object.

所以你必须使用 fetch() 和 sum()

public function totalRecords($keyword) {
    $sql = "SELECT SUM(num) as num  FROM
             (SELECT COUNT(uid) as num FROM user_information WHERE title LIKE ? OR name LIKE ? OR surname LIKE ? 
             UNION ALL
            SELECT COUNT(id)as num FROM groups WHERE name LIKE ?)
            AS X";
    $query = $this->db->prepare($sql);
    $query->execute(array("%$keyword%", "%$keyword%", "%$keyword%", "%$keyword%"));
    $Total = $query->fetch();
   return $Total['num'];
}