oci_free_statement

    (PHP 5, PHP 7, PHP 8, PECL OCI8 >= 1.1.0)

    oci_free_statement — 释放关联于语句或游标的所有资源

    说明

    oci_free_statement(resource $statement): bool

    oci_free_statement() 释放关联于 Oracle 游标或语句的资源，该资源是作为 oci_parse() 的结果或者是从 Oracle 取得。

    参数

    statement

    有效的 OCI 语句。

    返回值

    成功时返回 true， 或者在失败时返回 false。

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    用户贡献的备注 3 notes

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    3
    Jen M.
    16 years ago
    oci_free_statement doesn't always free up cursors. I had a query where I performed the following functions in a loop:

    OCIParse
    OCIExecute
    Oci_fetch_assoc
    (Grab some field values)
    OciFreeStatement

    I didn't specify the use of a cursor, but ran into a "maximum
    open cursors exceeded" error. Within my code, I had one "select * from table_with_lobs" query. When I changed the query to be "select a, b, c, from table_with_lobs" (where I specified the actual column names and where those columns were not LOB fields) the error message went away and I didn't have to resort to upping the max_open_cursors value in Oracle.
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    2
    rada at instinctive dot it
    16 years ago
    If you are using cursors, make sure to free the statement *and* the cursor, especially if there is a possibility of running the proc/cursor again (e.g. with different parameters).

    <?php

    oci_execute    ($stmt);
    oci_execute($crsr);

    // iterate through cursor...

    oci_free_statement($stmt);
    oci_free_statement($crsr);
    ?>

    You need to do it explicitly, closing connection for example does not seem to release the cursor.
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    1
    passerbyxp at gmail dot com
    11 years ago
    A freed statement is not "empty()", it's still a resource:

    <?php
    $con    =oci_connect(/*connect*/);
    $q=oci_parse($con,"SELECT sysdate FROM dual");
    var_dump($q); // resource(5) of type (oci8 statement)
    var_dump(empty($q)); // bool(false)
    var_dump(oci_statement_type($q)); // string(6) "SELECT"
    echo "------\n";
    oci_execute($q);
    var_dump($q); // same as above
    var_dump(empty($q));
    var_dump(oci_statement_type($q));
    echo     "------\n";
    oci_free_statement($q);
    var_dump($q); // resource(5) of type (Unknown)
    var_dump(empty($q)); // bool(false)
    var_dump(oci_statement_type($q)); // generates warning and returns false
    oci_close($con);
    ?>

    So far I can not think of a way to determine if a statement is freed without using an additional flag...
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