php - 将 WHERE if 条件插入 mysql 类查询中。

Question

您好，我如何转换以下查询，这样我就不会出现错误:可捕获的 fatal error :

分页类的对象无法转换为字符串

$paginate = new pagination($page, 'SELECT * FROM properties WHERE 1', $options);


            if (!empty($sector)) { $paginate .= " AND sector = :sector"; }
            if (!empty($property_type))  { $paginate .= " AND property_type = :property_type"; }
            if (!empty($contract))  { $paginate .= " AND contract = :contract"; }
            if (!empty($minimum_price))  { $paginate .= " AND price BETWEEN :minimum_price AND :maximum_price"; }
            if (!empty($m2_from))  { $paginate .= " AND m2 BETWEEN :m2_from AND :m2_until"; }
            if (!empty($contract))  { $paginate .= " AND bedrooms = :bedrooms"; }

Answer 1

$paginate是pagination类的对象变量，所以它的变量类型是object。我会先构建查询，然后创建对象。

因此，我们在这里所做的是创建查询的字符串变量，并使用默认的 SELECT 查询对其进行分配。然后我们运行 if 语句，然后构建它，这样您就不会尝试将字符串添加到对象类型。

$query= "SELECT * FROM properties WHERE 1";

        if (!empty($sector)) { $query .= " AND sector = :sector"; }
        if (!empty($property_type))  { $query.= " AND property_type = :property_type"; }
        if (!empty($contract))  { $query .= " AND contract = :contract"; }
        if (!empty($minimum_price))  { $query .= " AND price BETWEEN :minimum_price AND :maximum_price"; }
        if (!empty($m2_from))  { $query .= " AND m2 BETWEEN :m2_from AND :m2_until"; }
        if (!empty($contract))  { $query .= " AND bedrooms = :bedrooms"; }

$paginate = new pagination($page, $query, $options);

编辑 1

此外，您的 SELECT 查询也不正确。您缺少 WHERE 子句后的列名称。