oci-execute.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 5e41012cfdf8f2eff5fa56de446c7656afac536c Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: dallas, mowangjuanzi -->
<refentry xml:id="function.oci-execute" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>oci_execute</refname>
  <refpurpose>执行语句</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>oci_execute</methodname>
   <methodparam><type>resource</type><parameter>statement</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>OCI_COMMIT_ON_SUCCESS</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   执行先前从 <function>oci_parse</function> 返回的 <parameter>statement</parameter>。
  </para>
  <para>
   执行后，像 <literal>INSERT</literal> 这样的语句默认会将数据提交到数据库中。对于像 <literal>SELECT</literal>
   这样的语句，执行查询的逻辑。随后可以使用 <function>oci_fetch_array</function> 等函数在 PHP 中获取查询结果。
  </para>
  <para>
   每个已解析的语句可能会执行多次，节省了重新解析的成本。当使用 <function>oci_bind_by_name</function> 绑定数据时，这通常用于 <literal>INSERT</literal> 语句。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>statement</parameter></term>
     <listitem>
      <para>
       有效的 OCI 语句标识符。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
        可选的第二个参数可以是以下常量之一：
       <table>
        <title>执行模式</title>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>常量</entry>
           <entry>说明</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry><constant>OCI_COMMIT_ON_SUCCESS</constant></entry>
           <entry>当语句成功时，自动提交此连接的所有未完成更改。这是默认设置。</entry>
          </row>
          <row>
           <entry><constant>OCI_DESCRIBE_ONLY</constant></entry>
           <entry>使查询元数据可用于 <function>oci_field_name</function> 等函数，但不创建结果集。任何后续的读取调用（例如
           <function>oci_fetch_array</function>）都将失败。</entry>
          </row>
          <row>
           <entry><constant>OCI_NO_AUTO_COMMIT</constant></entry>
           <entry>不要自动提交更改。</entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
      <para>
       使用 <constant>OCI_NO_AUTO_COMMIT</constant> 模式启动或继续事务。当连接关闭或脚本结束时，事务会自动回滚。显式调用
       <function>oci_commit</function> 来提交事务，或调用 <function>oci_rollback</function> 来中止它。
      </para>
      <para>
       插入或更新数据时，出于关系数据一致性和性能原因，建议使用事务。
      </para>
      <para>
       If <constant>OCI_NO_AUTO_COMMIT</constant> mode is used for any
       statement including queries, and 
        <function>oci_commit</function>
       or <function>oci_rollback</function> is not subsequently
       called, then OCI8 will perform a rollback at the end of the
       script even if no data was changed.  To avoid an unnecessary
       rollback, many scripts do not
       use <constant>OCI_NO_AUTO_COMMIT</constant> mode for queries or
       PL/SQL.  Be careful to ensure the appropriate transactional
       consistency for the application when
       using <function>oci_execute</function> with different modes in
       the same script.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>oci_execute</function> 用于查询</title>
    <programlisting role="php">
<![CDATA[
<?php

$conn = oci_connect('hr', 'welcome', 'localhost/XE');

$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);

echo "<table border='1'>\n";
while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
    echo "<tr>\n";
    foreach ($row as $item) {
        echo "    <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : "&nbsp;") . "</td>\n";
    }
    echo "</tr>\n";
}
echo "</table>\n";

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title><function>oci_execute</function> 未指定模式示例</title>
    <programlisting role="php">
<![CDATA[
<?php

// Before running, create the table:
//   CREATE TABLE MYTABLE (col1 NUMBER);

$conn = oci_connect('hr', 'welcome', 'localhost/XE');

$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (123)');

oci_execute($stid); // The row is committed and immediately visible to other users

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title><function>oci_execute</function> 和 <constant>OCI_NO_AUTO_COMMIT</constant> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

// Before running, create the table:
//   CREATE TABLE MYTABLE (col1 NUMBER);

$conn = oci_connect('hr', 'welcome', 'localhost/XE');

$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (:bv)');
oci_bind_by_name($stid, ':bv', $i, 10);
for ($i = 1; $i <= 5; ++$i) {
    oci_execute($stid, OCI_NO_AUTO_COMMIT);
}
oci_commit($conn);  // commits all new values: 1, 2, 3, 4, 5

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>具有不同提交模式的 <function>oci_execute</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

// Before running, create the table:
//   CREATE TABLE MYTABLE (col1 NUMBER);

$conn = oci_connect('hr', 'welcome', 'localhost/XE');

$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (123)');
oci_execute($stid, OCI_NO_AUTO_COMMIT);  // data not committed

$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (456)');
oci_execute($stid);  // commits both 123 and 456 values

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title><function>oci_execute</function> 与
     <constant>OCI_DESCRIBE_ONLY</constant> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

$conn = oci_connect('hr', 'welcome', 'localhost/XE');

$stid = oci_parse($conn, 'SELECT * FROM locations');
oci_execute($s, OCI_DESCRIBE_ONLY);
for ($i = 1; $i <= oci_num_fields($stid); ++$i) {
    echo oci_field_name($stid, $i) . "<br>\n";
}

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

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Transactions are automatically rolled back when connections are
    closed, or when the script ends, whichever is soonest.  Explicitly
    call <function>oci_commit</function> to commit a transaction.
   </para>
   <para>
    Any call to <function>oci_execute</function> that uses
    <constant>OCI_COMMIT_ON_SUCCESS</constant> mode explicitly or by
    default will commit any previous uncommitted transaction.
   </para>
   <para>
    Any Oracle DDL statement such as <literal>CREATE</literal>
    or <literal>DROP</literal> will automatically commit any
    uncommitted transaction.
   </para>
  </note>
  <note>
   <para>
    Because the <function>oci_execute</function> function generally
    sends the statement to the
    database, <function>oci_execute</function> can identify some
    statement syntax errors that the lightweight,
    local <function>oci_parse</function> function does not.
   </para>
  </note>
 </refsect1>

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

</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->