doc-zh/reference/pgsql/functions/pg-field-prtlen.xml at master · php/doc-zh · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 39bb8a868935a56cfce438b0169e13c02c93211c Maintainer: dallas Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.pg-field-prtlen" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_field_prtlen</refname>
  <refpurpose>返回打印的长度</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>pg_field_prtlen</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_name_or_number</parameter></methodparam>
  </methodsynopsis>
  <methodsynopsis>
   <type>int</type><methodname>pg_field_prtlen</methodname>
   <methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>field_name_or_number</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_field_prtlen</function> 返回 PostgreSQL <parameter>result</parameter>
   中特定值的实际打印长度（字符数）。行编号从 0 开始。此函数将在出错时返回 &false;。
  </para>
  <para>
   <parameter>field_name_or_number</parameter> 可以传递 <type>int</type> 或 <type>string</type>。如果它作为
   <type>int</type> 传递，PHP 将其视为字段号，否则视为字段名。
  </para>
  <para>
   请参阅 <function>pg_field_name</function> 页面中给出的示例。
  </para>
  <note>
   <para>
    本函数以前的名字为 <function>pg_fieldprtlen</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>
       结果中的行号。行从 0 向上编号。如果省略，则获取当前行。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   字段打印的长度。
  </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>获取字段的信息</title>
    <programlisting role="php">
<![CDATA[
<?php
  $dbconn = pg_connect("dbname=publisher") or die("Could not connect");

  $res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
  $i = pg_num_fields($res);
  for ($j = 0; $j < $i; $j++) {
      echo "column $j\n";
      $fieldname = pg_field_name($res, $j);
      echo "fieldname: $fieldname\n";
      echo "printed length: " . pg_field_prtlen($res, $fieldname) . " characters\n";
      echo "storage length: " . pg_field_size($res, $j) . " bytes\n";
      echo "field type: " . pg_field_type($res, $j) . " \n\n";
  }
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
column 0
fieldname: author
printed length: 6 characters
storage length: -1 bytes
field type: varchar

column 1
fieldname: year
printed length: 4 characters
storage length: 2 bytes
field type: int2

column 2
fieldname: title
printed length: 24 characters
storage length: -1 bytes
field type: varchar
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_field_size</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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