pg_field_type_oid
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
pg_field_type_oid — Returns the type ID (OID) for the corresponding field number
说明
pg_field_type_oid() returns an integer containing the
OID of the base type of the given field in the
given result instance.
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.
注意:
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.
参数
-
result -
An PgSql\Result instance, returned by pg_query(), pg_query_params() or pg_execute()(among others).
-
field -
Field number, starting from 0.
返回值
The OID of the field's base type.
更新日志
| 版本 | 说明 |
|---|---|
| 8.1.0 |
现在 result 参数接受 PgSql\Result
实例，之前接受 资源(resource)。
|
范例
示例 #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($res, 0);
?>
以上例程会输出：
Title field type OID: 1043
add a note
User Contributed Notes 2 notes
<?php
private function mapping($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;
}
?>
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.
备份地址：http://www.lvesu.com/blog/php/function.pg-field-type-oid.php