PHP 7.1.19 Released

oci_field_scale

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

oci_field_scaleTell the scale of the field

Descrizione

int oci_field_scale ( resource $statement , mixed $field )

Returns the scale of the column with field index.

For FLOAT columns, precision is nonzero and scale is -127. If precision is 0, then column is NUMBER. Else it's NUMBER(precision, scale).

Elenco dei parametri

statement

A valid OCI statement identifier.

field

Can be the field's index (1-based) or name.

Valori restituiti

Returns the scale as an integer, or FALSE on errors.

Esempi

Example #1 oci_field_scale() Example

<?php

// Create the table with:
//   CREATE TABLE mytab (c1 NUMBER, c2 FLOAT, c3 NUMBER(4), c4 NUMBER(5,3));

$conn oci_connect("hr""hrpwd""localhost/XE");
if (!
$conn) {
    
$m oci_error();
    
trigger_error(htmlentities($m['message']), E_USER_ERROR);
}

$stid oci_parse($conn"SELECT * FROM mytab");
oci_execute($stidOCI_DESCRIBE_ONLY); // Use OCI_DESCRIBE_ONLY if not fetching rows

$ncols oci_num_fields($stid);
for (
$i 1$i <= $ncols$i++) {
    echo 
oci_field_name($stid$i) . " " 
        
oci_field_precision($stid$i) . " " 
        
oci_field_scale($stid$i) . "<br>\n";
}

// Outputs:
//   C1    0 -127
//   C2  126 -127
//   C3    4    0
//   C4    5    3

oci_free_statement($stid);
oci_close($conn);

?>

Note

Nota:

In PHP versions before 5.0.0 you must use ocicolumnscale() instead. This name still can be used, it was left as alias of oci_field_scale() for downwards compatability. This, however, is deprecated and not recommended.

Vedere anche:

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User Contributed Notes 1 note

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VLroyrenn
2 months 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).
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