从查询中按值查找特定字段

Question

I have a query:

SELECT * FROM custom_fields_values WHERE `custom_field_value_for_item-id` = 1

which selects:

| custom_field_value_id | custom_field_for_item-id | custom_field_value | custom_field_to-compare_to |
|-----------------------|--------------------------|--------------------|----------------------------|
| 1                     | 1                        | test1              | 3                          |
| 2                     | 1                        | test2              | 4                          |

from my table.

How can I access the custom_field_value where custom_field_to_compare_to == 3 ? And can I tell if this doesn't exist?

I know I could modify the query and just select it straight away, but I need to narrow down the already performed query.

Answer 1

It would probably make more sense to simply query the database again.

But if you want to search through the results that you already have retrieved, you could use for example array_filter() .

A simple example:

$search = "3";
$filtered_rows = array_filter($all_found_rows, function($value) use ($search) {
    return $Value['custom_field_to-compare_to'] === $search;
  }
);

Answer 2

The easiest solution will be to just iterate over the resultset and find the row with the target value.

However, if you do not wish to use loops, you may want to look into PHP LINQ . With that you can do something like this:

// Assuming $result has the resultset from the query
$data= from('$result')->in($result)
            ->where('$result=> $result->custom_field_to_compare_to == 3')
            ->select('$result->custom_field_value');