archived-doc-zh/reference/pgsql/functions/pg-fetch-array.xml

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<refentry xml:id="function.pg-fetch-array" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_fetch_array</refname>
  <refpurpose>获取一行作为数组</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>pg_fetch_array</methodname>
   <methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>row</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>PGSQL_BOTH</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_fetch_array</function>
   返回与所提取的行（元组/记录）相一致的数组。
  </para>
  <para>
   <function>pg_fetch_array</function> 是 <function>pg_fetch_row</function>
   的扩展版本。在结果数组中不仅以数字索引（字段编号）方式存放数据，还用关联索引（字段名）存储数据。它默认存储两个索引。
  </para>
  &database.fetch-null;
  <para>
   使用 <function>pg_fetch_array</function> 并不比 <function>pg_fetch_row</function> 慢的明显，而且在使用中提供了更大的方便。
  </para>
 </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。如果省略或为 &null;，则获取下一行。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      &pgsql.parameter.mode;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   数字方式（从 0 开始）或关联方式（按字段名索引）或两者共同索引的 <type>array</type>。<type>array</type>
   中的每个值都表示为 <type>string</type>。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、没有更多行或任何其他错误，则返回 &false;。从 SELECT 以外的查询结果中获取也将返回 &false;。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.result-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_fetch_array</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php 

$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occurred.\n";
  exit;
}

$result = pg_query($conn, "SELECT author, email FROM authors");
if (!$result) {
  echo "An error occurred.\n";
  exit;
}

$arr = pg_fetch_array($result, 0, PGSQL_NUM);
echo $arr[0] . " <- Row 1 Author\n";
echo $arr[1] . " <- Row 1 E-mail\n";

// The row parameter is optional; NULL can be passed instead,
// to pass a result_type.  Successive calls to pg_fetch_array
// will return the next row.
$arr = pg_fetch_array($result, NULL, PGSQL_ASSOC);
echo $arr["author"] . " <- Row 2 Author\n";
echo $arr["email"] . " <- Row 2 E-mail\n";

$arr = pg_fetch_array($result);
echo $arr["author"] . " <- Row 3 Author\n";
echo $arr[1] . " <- Row 3 E-mail\n";

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_fetch_row</function></member>
    <member><function>pg_fetch_object</function></member>
    <member><function>pg_fetch_result</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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