<?xml version="1.0" encoding="utf-8"?>

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<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.52 -->

<refentry xml:id="function.pg-field-type" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>pg_field_type</refname>

<refpurpose>

返回相应字段编号的类型名称

</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type>string</type><methodname>pg_field_type</methodname>

<methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>

<methodparam><type>int</type><parameter>field</parameter></methodparam>

</methodsynopsis>

<para>

<function>pg_field_type</function> 返回字符串，其中包含指定 <parameter>result</parameter> 实例中指定 <parameter>field</parameter> 的基本类型名称。

</para>

<note>

<para>

如果字段使用 PostgreSQL domain（而不是基本类型），则返回的是 domain 的底层类型名称，而不是 domain 本身的名称。

</para>

</note>

<note>

<para>

本函数以前的名字为 <function>pg_fieldtype</function>。

</para>

</note>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>result</parameter></term>

<listitem>

&pgsql.parameter.result;

</listitem>

</varlistentry>

<varlistentry>

<term><parameter>field</parameter></term>

<listitem>

<para>

字段编号，从 0 开始。

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

包含字段类型的基本名称的 <type>string</type>。

</para>

</refsect1>

<refsect1 role="changelog">

&reftitle.changelog;

<informaltable>

<tgroup cols="2">

<thead>

<row>

<entry>&Version;</entry>

<entry>&Description;</entry>

</row>

</thead>

<tbody>

&pgsql.changelog.result-object;

</tbody>

</tgroup>

</informaltable>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title>获取字段信息</title>

<programlisting role="php">

<![CDATA[

<?php

$dbconn = pg_connect("dbname=publisher") or die("Could not connect");

// 假设 'title' 是 varchar 类型

$res = pg_query($dbconn, "select title from authors where author = 'Orwell'");

echo "Title field type: ", pg_field_type($res, 0);

?>

]]>

</programlisting>

&example.outputs;

<screen>

<![CDATA[

Title field type: varchar

]]>

</screen>

</example>

</para>

</refsect1>

<refsect1 role="seealso">

&reftitle.seealso;

<para>

<simplelist>

<member><function>pg_field_prtlen</function></member>

<member><function>pg_field_name</function></member>

<member><function>pg_field_type_oid</function></member>

</simplelist>

</para>

</refsect1>

</refentry>

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