pg_field_type_oid
(PHP 5 >= 5.1.0)
pg_field_type_oid — Returns the type ID (OID) for the corresponding field number
Описание
pg_field_type_oid() returns an integer containing the OID of the base type of the given field_number in the given PostgreSQL result resource.
You can get more information about the field type by querying PostgreSQL's pg_type system table using the OID obtained with this function. The PostgreSQL format_type() function will convert a type OID into an SQL standard type name.
Замечание: If the field uses a PostgreSQL domain (rather than a basic type), it is the OID of the domain's underlying type that is returned, rather than the OID of the domain itself.
Список параметров
- result
-
PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).
- field_number
-
Field number, starting from 0.
Возвращаемые значения
The OID of the field's base type. FALSE is returned on error.
Примеры
Пример #1 Getting information about fields
<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
// Assume 'title' is a varchar type
$res = pg_query($dbconn, "select title from authors where author = 'Orwell'");
echo "Title field type OID: ", pg_field_type_oid($res, 0);
?>
Результат выполнения данного примера:
Title field type OID: 1043
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Коментарии
This function can be used to improve the performance of your application.pg_field_type() makes an internal query to the pg_type table and it can be really slow.
So if your application previously know the oids of your database, you can save the execution time of this query in every request.
<?php
private function mapping($q, $result)
{
$types = [];
for ($i = 0, $count = \pg_num_fields($q); $i < $count; ++$i) {
$types[$i] = \pg_field_type_oid($q, $i);
}
foreach ($result as $k => &$row) {
$i = -1;
foreach ($row as $name => &$value) {
++$i;
if ($value === null) {
continue;
}
switch ($types[$i]) {
case 20:
case 21:
case 23: $value = (int)$value; break;
case 16507: /*$value = (string)$value; */break;
default:
throw new \RuntimeException(
\pg_field_type($q, $i) .' type. Need mapping ' . \pg_field_type_oid($q, $i)
);
}
}
}
unset($value, $row);
return $result;
}
?>