Hi internals,
I just stumbled upon what I consider to be a bug with the PDO pgsql driver.
*TL;DR: the driver treats parameters bound with PARAM_INT the same as
PARAM_STR.*
Take the following example:
```
$pdo = new PDO('pgsql:host=localhost;port=5432', 'postgres', 'postgres');
$statement = $pdo->prepare("
SELECT ST_AsText(
ST_Transform(
ST_GeomFromText('POINT(0 0)', 2154),
?
)
)
");
$statement->bindValue(1, 4326, PDO::PARAM_INT);
$statement->execute();
```
This fails with the following message:
PDOException: SQLSTATE[XX000]: Internal error: 7 ERROR: could not parse
> proj string '4326'
This is because the pgsql driver seems to treat everything as PARAM_STR,
despite being explicitly requested to bind the value as PARAM_INT; the
placeholder is therefore replaced with the string '4326' instead of the
integer 4326.
The problem is, in PostGIS, the ST_Transform()
<https://postgis.net/docs/ST_Transform.html> function has different
signatures with different behaviours depending on whether the second
parameter is an integer or a string.
As far as I can see, because of this issue, *there is no way to pass an
actual integer to ST_Transform()*, which forces me to use
PostgreSQL-specific cast syntax to get the behaviour I need, in a library
<https://github.com/brick/geo> I maintain that's supposed to work with any
GIS-enabled database.
Is there any reason why the pgsql driver doesn't respect PDO::PARAM_STR?
I asked this question on StackOverflow
<https://stackoverflow.com/q/66625661/759866>, and was pointed to the
following bug, which I'm not sure is directly related, but was closed as
"not a bug":
https://bugs.php.net/bug.php?id=50206
*Should this be requalified as a bug and be fixed?*
Thanks in advance for your consideration,
— Benjamin
