Edit report at https://bugs.php.net/bug.php?id=71885&edit=1
ID: 71885
Updated by: mbeccati@php.net
Reported by: miki at epoch dot co dot il
Summary: PostgreSQL has questin mark operator. This collide
with PDO placeholder
Status: Open
Type: Feature/Change Request
Package: PDO PgSQL
Operating System: NA
PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
There are plenty of alternatives on the postgres side, i.e. using the underlying function, or
defining a new operator. Adapting PDO is not going to be that easy, in comparison.
Previous Comments:
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[2016-03-24 08:08:12] miki at epoch dot co dot il
PDO has its own advantages. For example the named placeholders and its general abstraction.
If only we could set the placeholder char or disable the question mark it would be perfect.
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[2016-03-24 07:38:51] yohgaki@php.net
I don't maintain PDO pgsql, but I think it cannot workaround unless introducing new place
holder. i.e. Specify meta char like "LIKE" query.
http://www.postgresql.org/docs/9.5/static/functions-matching.html
Obvious workaround is to use pgsql module. One needs native extension to use most out of PostgreSQL.
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[2016-03-24 07:20:17] miki at epoch dot co dot il
I missed rowan answer.
So I guess ATTR_EMULATE_PREPARES is irrelevant
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[2016-03-24 07:16:03] miki at epoch dot co dot il
Hi Requinx,
The following code failed:
$sql = "SELECT * FROM post WHERE locations ? :location ORDER BY locations->:location"
$pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES ,false);
$stmt = $pdo->prepare($sql); // tried this and version bellow
$stmt = $pdo->prepare($sql, [\PDO::ATTR_EMULATE_PREPARES=>false]);
$stmt->bindValue(':location', 'bar', \PDO::PARAM_STR);
$stmt->execute();
Error when ATTR_EMULATE_PREPARES is false that happen at the line of the prepare():
Warning: PDO::prepare(): SQLSTATE[HY093]: Invalid parameter number: mixed named and positional
parameters in /path/file.php on line 57
Error when ATTR_EMULATE_PREPARES is true that happen at the line of the execute():
Warning: PDOStatement::execute(): SQLSTATE[HY093]: Invalid parameter number: mixed named and
positional parameters in /path/file.php on line 48
Any idea?
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[2016-03-23 12:05:46] rowan dot collins at gmail dot com
Enabling or disabling emulated prepares does not work around this issue, it just changes which error
messages you see.
In the simplest case, with no actual parameters:
- When emulation is enabled, the ? will be treated as a placeholder by the emulation code itself,
and raise an error about the parameter not being filled.
- When emulation is disabled, PDO will still parse it and replace ? with $1, so that Postgres will
expect a parameter. (This then gives a syntax error because that's an illegal position for a
placeholder.)
In the case where there is a real named parameter alongside the ? operator (as in the OP's
example), PDO parses the statement to detect whether named or positional parameters were used
(because the driver may need to rewrite the syntax) and will complain that it's found a mixture
*before even attempting to prepare it*.
The ability to change (or disable) the placeholder char would fix all these cases, since the ?
placeholder is being read by PDO in all cases: either to emulate prepares, or to rewrite to the
syntax appropriate for the selected DB driver.
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