pg-fetch-result.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.pg-fetch-result" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_fetch_result</refname>
  <refpurpose>从结果实例返回值</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type><type>null</type></type><methodname>pg_fetch_result</methodname>
   <methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
   <methodparam><type class="union"><type>string</type><type>false</type><type>null</type></type><parameter>row</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>field</parameter></methodparam>
  </methodsynopsis>
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type><type>null</type></type><methodname>pg_fetch_result</methodname>
   <methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>field</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_fetch_result</function> 返回 <classname>PgSql\Result</classname> 实例中特定行和字段（列）的值。
  </para>
  <note>
   <para>
    此函数过去称为 <function>pg_result</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>row</parameter></term>
     <listitem>
      <para>
       要获取的结果中的行号。行从 0 向上编号。如果省略，则获取下一行。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>field</parameter></term>
     <listitem>
      <para>       
       表示要获取的字段（列）名的 <type>string</type>，否则为表示要获取的字段编号的 <type>int</type>。字段从 0 向上编号。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   布尔值返回为 &quot;t&quot; 或 &quot;f&quot;。所有其它类型，包括数组，都以字符串形式返回，其格式与 <command>psql</command>
   程序中的 PostgreSQL 默认方式相同。数据库 <literal>NULL</literal> 值作为 &null; 返回。
  </para>
  <para>
   如果 <parameter>row</parameter> 超过集合中的行数或任何其他错误，则返回 &false;。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.3.0</entry>
      <entry>
       <parameter>row</parameter> 现在可为 null。
      </entry>
     </row>
     &pgsql.changelog.result-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_fetch_result</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$db = pg_connect("dbname=users user=me");

$res = pg_query($db, "SELECT 1 UNION ALL SELECT 2");

$val = pg_fetch_result($res, 1, 0);

echo "First field in the second row is: ", $val, "\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
First field in the second row is: 2
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_query</function></member>
    <member><function>pg_fetch_array</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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