OCI8 函数
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oci_parse

(PHP 5, PECL OCI8 >= 1.1.0)

oci_parse — 配置 Oracle 语句预备执行

说明

resource oci_parse ( resource $connection , string $query )

oci_parse() 在 connection 上配置 query 并返回语句标识符以用于 oci_bind_by_name()，oci_execute() 以及其它函数。

Note:

本函数并不验证 query。要知道 query 是否是合法的 SQL 或 PL/SQL 语句的唯一方法是执行它。

oci_parse() 在出错时返回 FALSE。

Note:

在 PHP 5.0.0 之前的版本必须使用 ociparse() 替代本函数。该函数名仍然可用，为向下兼容作为 oci_parse() 的别名。不过其已被废弃，不推荐使用。

OCI8 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 配置 Oracle 语句预备执行

用户评论:

sfuentealba at gmail dot com (23-Feb-2012 11:21)

Si alguien necesita ejecutar una función (FUNCTION) almacenada en oracle (no un SP) que tenga parámetros OUT, se realiza de la siguiente manera

$sql="begin :result := MI_FUNCION (:out_salida);END;";

$stmt = oci_parse($conn, $sql);

oci_bind_by_name($stmt, ":out_salida",$salida,128);

oci_bind_by_name($stmt, "result", &$result);

Espero le sirva a alguien... Saludos

falundir at gmail dot com (08-Feb-2011 01:38)

When you want to call stored function (and want to read its result) which executes DML queries (insert, update, delete) inside its body you can't use "select your_stored_function(:param1, :param2) from dual" because you will receive "ORA-14551: cannot perform a DML operation inside a query" error.

In order to call such function and get its result you need to wrap it into nested procedure with OUT parameter like this:

DECLARE
  PROCEDURE caller(return_value OUT NUMBER) AS
  BEGIN
    return_value := your_stored_function(:param1, :param2);
  END;
BEGIN
  caller(:return_value);
END;

and bind to :return_value variable to get the result of function.

michael dot virnstein at brodos dot de (04-Dec-2007 04:43)

A neat way to parse a query only once per script, if the query is done inside a function:

<?php
function querySomething($conn, $id)
{
    static $stmt;

    if (is_null($stmt)) {
        $stmt = oci_parse($conn, 'select * from t where pk = :id');
    }

    oci_bind_by_name($stmt, ':id', $id, -1);

    oci_execute($stmt, OCI_DEFAULT);

    return oci_fetch_array($stmt, OCI_ASSOC);

}

?>

With the static variable, the statment handle isn't closed after the function has terminated. Very nice for functions that are called e.g. in loops. Unfortunately this only works for static sql. If you have dynamic sql, you can do the following:

<?php

function querySomething($conn, $data)
{
    static $stmt = array();
   
    $first = true;
   
    $query = 'select * from t';

    foreach ($data as $key => $value) {
        if ($first) {
            $first = false;
            $query .= ' where ';
        } else {
            $query .= ' and ';
        }
       
        $query .= "$key = :b$key";
    }
   
    $queryhash = md5($query);
  
    if (is_null($stmt[$queryhash])) {
        $stmt[$queryhash] = oci_parse($conn, $query);   
    }

    foreach ($data as $key => $value) {
        // don't use $value, because we bind memory addresses here.
        // this would result in every bind pointing at the same value after foreach
        oci_bind_by_name($stmt[$queryhash], ":b$key", $data[$key], -1);
    }
   
    oci_execute($stmt[$queryhash], OCI_DEFAULT);

    return oci_fetch_array($stmt[$queryhash], OCI_ASSOC);

}

?>

(27-Jan-2006 12:05)

one of the most things that is done wrong with oracle is the following.

Cosider:

<?php
$dbh = ocilogon('user', 'pass', 'db');

for ($i = 0; $i<=10; $i++) {
    $sth = ociparse($dbh, 'SELECT * FROM T WHERE x = :x');

    ocibindbyname($sth, ':x', $i, -1);
    ociexecute($sth, OCI_DEFAULT);
    if (ocifetchrow($sth, $row, OCI_ASSOC+OCI_RETURN_NULLS)) {
        var_dump($row);
    }
}

ocilogoff($dbh);
?>

Problem here is, that you parse the same statement over and over and that'll cost ressources and will introduce many wait events. This problem will increase exponentially with the number of users using your system. That's one of the things besides not using bind variables that will prevent your application from scaling well.

The right approach:

<?php
$dbh = ocilogon('user', 'pass', 'db');
$sth = ociparse($dbh, 'SELECT * FROM T WHERE x = :x');
for ($i = 0; $i<=10; $i++) {
    ocibindbyname($sth, ':x', $i, -1);
    ociexecute($sth, OCI_DEFAULT);
    if (ocifetchrow($sth, $row, OCI_ASSOC+OCI_RETURN_NULLS)) {
        var_dump($row);
    }
}
ocilogoff($dbh);
?>

Now we are parsing the statement once and using it as often as possible.

When your using Oracle, create proper indexes, use bind variables and parse once and execute often. Not doing so will get you into trouble when more than a few users are working with your application simultaneously.

kurt at kovac dot ch (04-May-2004 04:40)

For those that are having trouble with error checking, i have noticed on a lot of sites that people are trying to check the statement handle for error messages with OCIParse. Since the statement handle ($sth) is not created yet, you need to check the database handle ($dbh) for any errors with OCIParse. For example:

instead of:

<?php
$stmt = OCIParse($conn, $query);
if (!$stmt) {
   $oerr = OCIError($stmt);
   echo "Fetch Code 1:".$oerr["message"];
   exit;
}
?>

use:

<?php
$stmt = OCIParse($conn, $query);
if (!$stmt) {
   $oerr = OCIError($conn);
   echo "Fetch Code 1:".$oerr["message"];
   exit;
}
?>

Hope this helps someone.

jicurito at hotmail dot com (10-Dec-2003 12:41)

regarding egypt note on double quotes, the reason for that behaviour is that Oracle treats things with double quotes as identifiers on a given statement... using single quotes won't provoque mistakes...

egypt at nmt dot edu (15-Oct-2003 03:31)

Whereas MySQL doesn't care what kind of quotes are around a LIKE clause, ociexecute gives the error:
    ociexecute(): OCIStmtExecute: ORA-00904: "NM": invalid identifier
for the following.
<?php
$sql  = "SELECT * FROM addresses "
      . "WHERE state LIKE \"NM\"";  // error!
$stmt = ociparse($conn, $sql);
ociexecute($stmt);
?>

it's fine if you just use single quotes:
    . "WHERE state LIKE 'NM'";
but i think it's interesting that ociparse doesn't say anything

mwd at modulo3 dot de (22-Dec-2000 03:21)

if you're using "complex" statements e.g such having calls to build in oracle functions in the select list (as in example below), I did not find any other way as using the "AS <Name>" clause to being able to output the functions outcome using ociresult

example:

<?php
ociparse($conn,"select EMPNO, LPAD(' ', 2*(LEVEL-1)) || ENAME AS COMPLETE_FANTASY_NAME, JOB, HIREDATE from scott.emp start with job='MANAGER' connect by PRIOR EMPNO = MGR");

echo ociresult $stmt,"COMPLETE_FANTASY_NAME")." ";
?>

BTW: I also found out by TAE that "COMPLETE_FANATASY_NAME" might not be "complete fantasy" as it has to be all capital letters.