oci-get-implicit-resultset.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.oci-get-implicit-resultset" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>oci_get_implicit_resultset</refname>
  <refpurpose>Returns the next child statement resource from a parent statement resource that has Oracle Database Implicit Result Sets
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>resource</type><type>false</type></type><methodname>oci_get_implicit_resultset</methodname>
   <methodparam><type>resource</type><parameter>statement</parameter></methodparam>
  </methodsynopsis>
  <para>
   Used to fetch consectutive sets of query results after the
   execution of a stored or anonymous Oracle PL/SQL block where that
   block returns query results with the
   Oracle Database 12 (or later) <emphasis>DBMS_SQL.RETURN_RESULT</emphasis> PL/SQL
   function.  This allows PL/SQL blocks to easily return query
   results.
  </para>
  <para>
    The child statement can be used with any of the OCI8 fetching
    functions: <function>oci_fetch</function>, <function>oci_fetch_all</function>,
    <function>oci_fetch_array</function>, <function>oci_fetch_object</function>,
    <function>oci_fetch_assoc</function> or <function>oci_fetch_row</function>
  </para>
  <para>
    Child statements inherit their parent statement's prefetch value,
    or it can be explicitly set with <function>oci_set_prefetch</function>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>statement</parameter></term>
     <listitem>
       <para>A valid OCI8 statement identifier created
         by <function>oci_parse</function> and executed
         by <function>oci_execute</function>.  The statement
         identifier may or may not be associated with a SQL statement
         that returns Implicit Result Sets.
       </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a statement handle for the next child statement available
   on <parameter>statement</parameter>.  Returns &false; when child
   statements do not exist, or all child statements have been returned
   by previous calls
   to <function>oci_get_implicit_resultset</function>.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Fetching Implicit Result Sets in a loop</title>
    <programlisting role="php">
<![CDATA[
<?php

$conn = oci_connect('hr', 'welcome', 'localhost/pdborcl');
if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$sql = 'DECLARE
            c1 SYS_REFCURSOR;
        BEGIN
           OPEN c1 FOR SELECT city, postal_code FROM locations WHERE ROWNUM < 4 ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
           OPEN c1 FOR SELECT country_id FROM locations WHERE ROWNUM < 4 ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
        END;';

$stid = oci_parse($conn, $sql);
oci_execute($stid);

while (($stid_c = oci_get_implicit_resultset($stid))) {
    echo "<h2>New Implicit Result Set:</h2>\n";
    echo "<table>\n";
    while (($row = oci_fetch_array($stid_c, OCI_ASSOC+OCI_RETURN_NULLS)) != false) {
        echo "<tr>\n";
        foreach ($row as $item) {
            echo "  <td>".($item!==null?htmlentities($item, ENT_QUOTES|ENT_SUBSTITUTE):"&nbsp;")."</td>\n";
        }
        echo "</tr>\n";
    }
    echo "</table>\n";
}

// Output is:
//    New Implicit Result Set:
//     Beijing 190518
//     Bern    3095
//     Bombay  490231
//    New Implicit Result Set:
//     CN
//     CH
//     IN

oci_free_statement($stid);
oci_close($conn);

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

  <para>
   <example>
    <title>Getting child statement handles individually</title>
    <programlisting role="php">
<![CDATA[
<?php

$conn = oci_connect('hr', 'welcome', 'localhost/pdborcl');
if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$sql = 'DECLARE
            c1 SYS_REFCURSOR;
        BEGIN
           OPEN c1 FOR SELECT city, postal_code FROM locations WHERE ROWNUM < 4 ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
           OPEN c1 FOR SELECT country_id FROM locations WHERE ROWNUM < 4 ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
        END;';

$stid = oci_parse($conn, $sql);
oci_execute($stid);

$stid_1 = oci_get_implicit_resultset($stid);
$stid_2 = oci_get_implicit_resultset($stid);

$row = oci_fetch_array($stid_1, OCI_ASSOC+OCI_RETURN_NULLS);
var_dump($row);
$row = oci_fetch_array($stid_2, OCI_ASSOC+OCI_RETURN_NULLS);
var_dump($row);
$row = oci_fetch_array($stid_1, OCI_ASSOC+OCI_RETURN_NULLS);
var_dump($row);
$row = oci_fetch_array($stid_2, OCI_ASSOC+OCI_RETURN_NULLS);
var_dump($row);

// Output is:
//    array(2) {
//      ["CITY"]=>
//      string(7) "Beijing"
//      ["POSTAL_CODE"]=>
//      string(6) "190518"
//    }
//    array(1) {
//      ["COUNTRY_ID"]=>
//      string(2) "CN"
//    }
//    array(2) {
//      ["CITY"]=>
//      string(4) "Bern"
//      ["POSTAL_CODE"]=>
//      string(4) "3095"
//    }
//    array(1) {
//      ["COUNTRY_ID"]=>
//      string(2) "CH"
//    }

oci_free_statement($stid);
oci_close($conn);

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

  <para>
   <example>
    <title>Explicitly setting the Prefetch Count</title>
    <programlisting role="php">
<![CDATA[
<?php

$conn = oci_connect('hr', 'welcome', 'localhost/pdborcl');
if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$sql = 'DECLARE
            c1 SYS_REFCURSOR;
        BEGIN
           OPEN c1 FOR SELECT city, postal_code FROM locations ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
        END;';

$stid = oci_parse($conn, $sql);
oci_execute($stid);

$stid_c = oci_get_implicit_resultset($stid);
oci_set_prefetch($stid_c, 200);   // Set the prefetch before fetching from the child statement
echo "<table>\n";
while (($row = oci_fetch_array($stid_c, OCI_ASSOC+OCI_RETURN_NULLS)) != false) {
    echo "<tr>\n";
    foreach ($row as $item) {
        echo "  <td>".($item!==null?htmlentities($item, ENT_QUOTES|ENT_SUBSTITUTE):"&nbsp;")."</td>\n";
    }
    echo "</tr>\n";
}
echo "</table>\n";

oci_free_statement($stid);
oci_close($conn);

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

  <para>
   <example>
    <title>Implicit Result Set example without using <function>oci_get_implicit_resultset</function></title>
    <para>
    All results from all queries are returned consecutively.
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$conn = oci_connect('hr', 'welcome', 'localhost/pdborcl');
if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$sql = 'DECLARE
            c1 SYS_REFCURSOR;
        BEGIN
           OPEN c1 FOR SELECT city, postal_code FROM locations WHERE ROWNUM < 4 ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
           OPEN c1 FOR SELECT country_id FROM locations WHERE ROWNUM < 4 ORDER BY city;
           DBMS_SQL.RETURN_RESULT(c1);
        END;';

$stid = oci_parse($conn, $sql);
oci_execute($stid);

// Note: oci_fetch_all and oci_fetch() cannot be used in this manner
echo "<table>\n";
while (($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) != false) {
    echo "<tr>\n";
    foreach ($row as $item) {
        echo "  <td>".($item!==null?htmlentities($item, ENT_QUOTES|ENT_SUBSTITUTE):"&nbsp;")."</td>\n";
    }
    echo "</tr>\n";
}
echo "</table>\n";

// Output is:
//    Beijing 190518
//    Bern 3095
//    Bombay 490231
//    CN
//    CH
//    IN

oci_free_statement($stid);
oci_close($conn);

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

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   &oci.use.setprefetch;
  </note>
 </refsect1>

</refentry>
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