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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@329172 c90b9560-bf6c-de11-be94-00142212c4b1
312 lines
9 KiB
XML
312 lines
9 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.oci-execute" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>oci_execute</refname>
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<refpurpose>Executes a statement</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>oci_execute</methodname>
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<methodparam><type>resource</type><parameter>statement</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>OCI_COMMIT_ON_SUCCESS</initializer></methodparam>
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</methodsynopsis>
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<para>
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Executes a <parameter>statement</parameter> previously returned
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from <function>oci_parse</function>.
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</para>
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<para>
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After execution, statements like <literal>INSERT</literal> will
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have data committed to the database by default. For statements
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like <literal>SELECT</literal>, execution performs the logic of the
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query. Query results can subsequently be fetched in PHP with
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functions like <function>oci_fetch_array</function>.
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</para>
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<para>
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Each parsed statement may be executed multiple times, saving the
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cost of re-parsing. This is commonly used
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for <literal>INSERT</literal> statements when data is bound
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with <function>oci_bind_by_name</function>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>statement</parameter></term>
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<listitem>
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<para>
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A valid OCI statement identifier.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>mode</parameter></term>
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<listitem>
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<para>
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An optional second parameter can be one of the following constants:
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<table>
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<title>Execution Modes</title>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>Constant</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><constant>OCI_COMMIT_ON_SUCCESS</constant></entry>
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<entry>Automatically commit all outstanding changes for
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this connection when the statement has succeeded. This
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is the default.</entry>
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</row>
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<row>
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<entry><constant>OCI_DESCRIBE_ONLY</constant></entry>
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<entry>Make query meta data available to functions
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like <function>oci_field_name</function> but do not
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create a result set. Any subsequent fetch call such
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as <function>oci_fetch_array</function> will
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fail.</entry>
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</row>
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<row>
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<entry><constant>OCI_NO_AUTO_COMMIT</constant></entry>
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<entry>Do not automatically commit changes. Prior to PHP
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5.3.2 (PECL OCI8 1.4)
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use <constant>OCI_DEFAULT</constant> which is equivalent
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to <constant>OCI_NO_AUTO_COMMIT</constant>.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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<para>
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Using <constant>OCI_NO_AUTO_COMMIT</constant> mode starts or continues a
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transaction. Transactions are automatically rolled back when
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the connection is closed, or when the script ends. Explicitly
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call <function>oci_commit</function> to commit a transaction,
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or <function>oci_rollback</function> to abort it.
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</para>
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<para>
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When inserting or updating data, using transactions is
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recommended for relational data consistency and for performance
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reasons.
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</para>
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<para>
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If <constant>OCI_NO_AUTO_COMMIT</constant> mode is used for any
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statement including queries, and
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<function>oci_commit</function>
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or <function>oci_rollback</function> is not subsequently
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called, then OCI8 will perform a rollback at the end of the
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script even if no data was changed. To avoid an unnecessary
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rollback, many scripts do not
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use <constant>OCI_NO_AUTO_COMMIT</constant> mode for queries or
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PL/SQL. Be careful to ensure the appropriate transactional
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consistency for the application when
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using <function>oci_execute</function> with different modes in
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the same script.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>oci_execute</function> for queries</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$conn = oci_connect('hr', 'welcome', 'localhost/XE');
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$stid = oci_parse($conn, 'SELECT * FROM employees');
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oci_execute($stid);
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echo "<table border='1'>\n";
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while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
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echo "<tr>\n";
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foreach ($row as $item) {
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echo " <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>\n";
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}
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echo "</tr>\n";
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}
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echo "</table>\n";
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>oci_execute</function> without specifying a mode example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Before running, create the table:
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// CREATE TABLE MYTABLE (col1 NUMBER);
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$conn = oci_connect('hr', 'welcome', 'localhost/XE');
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$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (123)');
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oci_execute($stid); // The row is committed and immediately visible to other users
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>oci_execute</function> with <constant>OCI_NO_AUTO_COMMIT</constant> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Before running, create the table:
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// CREATE TABLE MYTABLE (col1 NUMBER);
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$conn = oci_connect('hr', 'welcome', 'localhost/XE');
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$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (:bv)');
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oci_bind_by_name($stid, ':bv', $i, 10);
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for ($i = 1; $i <= 5; ++$i) {
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oci_execute($stid, OCI_NO_AUTO_COMMIT); // use OCI_DEFAULT for PHP <= 5.3.1
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}
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oci_commit($conn); // commits all new values: 1, 2, 3, 4, 5
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>oci_execute</function> with different commit modes example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Before running, create the table:
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// CREATE TABLE MYTABLE (col1 NUMBER);
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$conn = oci_connect('hr', 'welcome', 'localhost/XE');
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$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (123)');
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oci_execute($stid, OCI_NO_AUTO_COMMIT); // data not committed
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$stid = oci_parse($conn, 'INSERT INTO mytab (col1) VALUES (456)');
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oci_execute($stid); // commits both 123 and 456 values
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>oci_execute</function> with
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<constant>OCI_DESCRIBE_ONLY</constant> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$conn = oci_connect('hr', 'welcome', 'localhost/XE');
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$stid = oci_parse($conn, 'SELECT * FROM locations');
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oci_execute($s, OCI_DESCRIBE_ONLY);
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for ($i = 1; $i <= oci_num_fields($stid); ++$i) {
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echo oci_field_name($stid, $i) . "<br>\n";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<note>
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<para>
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Transactions are automatically rolled back when connections are
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closed, or when the script ends, whichever is soonest. Explicitly
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call <function>oci_commit</function> to commit a transaction.
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</para>
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<para>
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Any call to <function>oci_execute</function> that uses
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<constant>OCI_COMMIT_ON_SUCCESS</constant> mode explicitly or by
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default will commit any previous uncommitted transaction.
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</para>
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<para>
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Any Oracle DDL statement such as <literal>CREATE</literal>
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or <literal>DROP</literal> will automatically commit any
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uncommitted transaction.
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</para>
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</note>
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<note>
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<para>
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Because the <function>oci_execute</function> function generally
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sends the statement to the
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database, <function>oci_execute</function> can identify some
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statement syntax errors that the lightweight,
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local <function>oci_parse</function> function does not.
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</para>
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</note>
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<note>
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<para>
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In PHP versions before 5.0.0 use <function>ociexecute</function>
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instead. &oci.name.compat.note;
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</para>
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</note>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>oci_parse</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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