# oci_get_implicit_resultset

(PHP 5 >= 5.6.0, PHP 7, PHP 8, PECL OCI8 >= 2.0.0)

oci_get_implicit_resultset — Returns the next child statement resource from a parent statement resource that has Oracle Database Implicit Result Sets

### 说明

oci_get_implicit_resultset(resource `$statement`): resource|false

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) DBMS_SQL.RETURN_RESULT PL/SQL function. This allows PL/SQL blocks to easily return query results.

The child statement can be used with any of the OCI8 fetching functions: oci_fetch(), oci_fetch_all(), oci_fetch_array(), oci_fetch_object(), oci_fetch_assoc() or oci_fetch_row()

Child statements inherit their parent statement's prefetch value, or it can be explicitly set with oci_set_prefetch().

### 参数

`statement`

  A valid OCI8 statement identifier created by oci_parse() and executed by oci_execute(). The statement identifier may or may not be associated with a SQL statement that returns Implicit Result Sets.

### 返回值

Returns a statement handle for the next child statement available on `statement`. Returns `false` when child statements do not exist, or all child statements have been returned by previous calls to oci_get_implicit_resultset().

### 示例

示例 #1 Fetching Implicit Result Sets in a loop

`<?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);
?>`

示例 #2 Getting child statement handles individually

`<?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);
?>`

示例 #3 Explicitly setting the Prefetch Count

`<?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);
?>`

示例 #4 Implicit Result Set example without using oci_get_implicit_resultset()

All results from all queries are returned consecutively.

`<?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);
?>`

### 注释

> 注意:

> 查询返回巨大数量的数据行时，通过增大 oci8.default_prefetch 值或使用 oci_set_prefetch() 可显著提高性能。

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