dba-firstkey.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.dba-firstkey" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>dba_firstkey</refname>
  <refpurpose>获取第一个键</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type></type><methodname>dba_firstkey</methodname>
   <methodparam><type>Dba\Connection</type><parameter>dba</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>dba_firstkey</function> 返回数据库的第一个键并重置内部键指针。
   这允许通过整个数据库进行线性搜索。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>dba</parameter></term>
     <listitem>
      <para>
       &dba.parameter.dba;
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   成功时返回键，&return.falseforfailure;。
  </para>
 </refsect1>

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

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>dba_nextkey</function></member>
    <member><function>dba_key_split</function></member>
    <member>Example 2 in the <link linkend="dba.examples">DBA examples</link></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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