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).
oci_field_scale
(PHP 5, PHP 7, PECL OCI8 >= 1.1.0)
oci_field_scale — Tell the scale of the field
Descrierea
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).
Parametri
-
statement -
A valid OCI statement identifier.
-
field -
Can be the field's index (1-based) or name.
Valorile întoarse
Returns the scale as an integer, or false on errors.
Exemple
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($stid, OCI_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
Notă:
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.
A se vedea și
- oci_field_precision() - Tell the precision of a field
- oci_field_type() - Returns a field's data type name
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User Contributed Notes 1 note
VLroyrenn ¶
6 years ago
