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)。
注意:
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。
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User Contributed Notes 1 note
VLroyrenn ¶
4 years ago
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).
备份地址：http://www.lvesu.com/blog/php/function.oci-field-scale.php