OCI8 函数
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oci_free_statement

(PHP 5, 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

bool oci_free_statement ( resource $statement )

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。

成功时返回 TRUE, 或者在失败时返回 FALSE

参数

statement

A valid OCI statement identifier.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE


OCI8 函数
在线手册:中文  英文

用户评论:

passerbyxp at gmail dot com (2012-12-19 08:37:48)

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...

Jen M. (2008-10-02 11:05:26)

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.

rada at instinctive dot it (2008-03-04 08:46:43)

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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