CascadiaPHP 2024

oci_parse

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

oci_parse预处理用于执行的 Oracle 语句

说明

oci_parse(resource $connection, string $sql): resource|false

使用 connection 预处理 sql 并返回语句标识符,语句标识符可跟 oci_bind_by_name()oci_execute() 和其它函数一起使用。

语句标识符可使用 oci_free_statement() 或将变量设置为 null 来释放。

参数

connection

Oracle 连接标识符,由 oci_connect()oci_pconnect()oci_new_connect() 返回。

sql

SQL 或 PL/SQL 语句。

SQL 语句不应以分号(";")结尾。PL/SQL 语句以分号(";")结尾。

返回值

成功时返回语句句柄,错误时为 false

示例

示例 #1 oci_parse() 的 SQL 语句示例

<?php

$conn
= oci_connect('hr', 'welcome', 'localhost/XE');

// Parse the statement. Note there is no final semi-colon in the SQL statement
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);

echo
"<table border='1'>\n";
while (
$row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
echo
"<tr>\n";
foreach (
$row as $item) {
echo
" <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : "&nbsp;") . "</td>\n";
}
echo
"</tr>\n";
}
echo
"</table>\n";

?>

示例 #2 oci_parse() 的 PL/SQL 语句示例

<?php

/*
Before running the PHP program, create a stored procedure in
SQL*Plus or SQL Developer:

CREATE OR REPLACE PROCEDURE myproc(p1 IN NUMBER, p2 OUT NUMBER) AS
BEGIN
p2 := p1 * 2;
END;

*/

$conn = oci_connect('hr', 'welcome', 'localhost/XE');
if (!
$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$p1 = 8;

// When parsing PL/SQL programs, there should be a final semi-colon in the string
$stid = oci_parse($conn, 'begin myproc(:p1, :p2); end;');
oci_bind_by_name($stid, ':p1', $p1);
oci_bind_by_name($stid, ':p2', $p2, 40);

oci_execute($stid);

print
"$p2\n"; // prints 16

oci_free_statement($stid);
oci_close($conn);

?>

注释

注意:

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

参见

add a note

User Contributed Notes 5 notes

up
1
interloper at ukr dot net
8 years ago
If you want using PL/SQL in variable:

<?php
$query
= "begin null; end;";
$stid = oci_parse($conn, "$query");
?>

or

<?php
$stid
= oci_parse($conn, "begin null; end;");
?>
up
1
michael dot virnstein at brodos dot de
16 years ago
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);

}

?>
up
0
kurt at kovac dot ch
20 years ago
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.
up
-1
egypt at nmt dot edu
20 years ago
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
up
-5
falundir at gmail dot com
13 years ago
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.
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