oci_get_implicit_resultset

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

oci_get_implicit_resultset — Returns the next child statement resource from a parent statement resource that has Oracle Database 12c Implicit Result Sets

说明

resource oci_get_implicit_resultset ( resource $statement )

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 Oracle's 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().

范例

Example #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);

?>

Example #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);

?>

Example #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);

?>

Example #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

Note:
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。