oci_field_scale

(PHP 5, PHP 7, PHP 8, PECL OCI8 >= 1.1.0)

oci_field_scale — 返回字段范围

说明

oci_field_scale ( resource $statement , int $field ) : int

返回索引为 field（从 1 开始）的字段的范围。如果无此字段则返回 false。

对于 FLOAT 字段，精度为非零值且范围为 -127。如果精度为 0，则字段为 NUMBER。其它类型为 NUMBER(precision, scale)。

Note:
在 PHP 5.0.0 之前的版本必须使用 ocicolumnscale() 替代本函数。该函数名仍然可用，为向下兼容作为 oci_field_scale() 的别名。不过其已被废弃，不推荐使用。

参见 oci_field_precision() 和 oci_field_type()。

User Contributed Notes

VLroyrenn 20-Apr-2018 04:28


If you're converting SQL values to their respective float and int values based on scale and precision like I am, there's a catch, here.



This is a slimmed-down version of the conversion logic I'm using :



<?php

$col = [

    'id' => $field_id,

    'name' => oci_field_name($statement, $field_id),

    'type' => oci_field_type($statement, $field_id),

    'scale' => oci_field_scale($statement, $field_id);

    'precision' => oci_field_precision($statement, $field_id);

]



$str_data = oci_result($statement, $field_id)



switch($col['type']) {

    case 'NUMBER':

        if ($col['precision'] !== 0 && $col['scale'] === -127) {

            // A binary float

            $data = floatval($str_data);

        } else if($col['scale'] === 0) {

            // An integer

            $data = intval($str_data);

        } else {

            // A fixed-point decimal number, which has no equivalent in PHP, so float

            $data = floatval($str_data);

        }

        

        break;

    

    default:

        $data = $str_data;

        break;

}



echo("{$col['name']} : $str_data ({$col['type']} ({$col['precision']}, {$col['scale']})) -> $data\n");

?>



What the doc doesn't say is that any number column that was defined without a scale parameter counts as a plain NUMBER(), which always has a precision of 0 and a scale of -127, so they get interpreted as floats even when they should be integers.



What the doc also doesn't say is that __all analytics functions that return numbers return a plain NUMBER()__, so something like COUNT(*), RANK() or FIRST_VALUE(foo) is still going to net you a float.



Be careful with these if you have any type-sensitive code that relies on those values (I'm personally very fond of using type-hinting and strict_types = 1).