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# pg_field_type_oid

(PHP 5 >= 5.1.0RC1)

pg_field_type_oid -- Returns the type ID (OID) for the corresponding field number

## 说明

int pg_field_type_oid ( resource result, int field_number )

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.

> 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`

  PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

`field_number`

  Field number, starting from 0.

## 返回值

The OID of the field's base type. `FALSE` is returned on error.

## 范例

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); ?>`

上例将输出：

    Title field type OID: 1043

## 参见

pg_field_type()
pg_field_prtlen()
pg_field_name()

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