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

# 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

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

Used to fetch consecutive 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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