Обсуждение: Uncertain about recoding prepared statements from MySQL to PostgreSQL

Within a lengthy form script:

In MySQL, I had, by way of example,

$sql = 'INSERT INTO testee VALUES (? ? ? ? ?)';
$stmt = $dbcx->stmt_init();
$stmt->bind_param('sssss',$protocode,$service,$sample,$normid,
$proctored);
$stmt->execute();

In PostgreSQL, to accomplish the same thing, I would want to try:

$query = "INSERT INTO testee (protocode,service,sample,normid,proctored)
VALUES ($1,$2,$3,$4,$5)";
$result = pg_prepare($cnx,"newtestee",$query);
pg_execute($cnx,"newtestee",array($protocode,$service,$sample,$normid,
$proctored));

Have I got this synyax down correctly?

I presume the pg_execute provides the data type information (the 'sssss'
in the MySQL bind-param???

I have modified another field (not shown above) as being type TIMESTAMP
DEFAULT now(). I assume I would 'pass over' such fields were they to
appear in the above example.

In MySQL the '?' placeholder in the INSERT was replaced with:
current_timestamp().

Thanks for the 'steer'. A few more coversions and I will develop a
rhythm of familiarity. For now, I want to avoid any bad habits and
faulty thinking. Its much more difficult to UNlearn than it is to learn
in the first place.

George

On Nov 2, 2007, at 8:13 PM, G. J. Walsh wrote:

> $query = "INSERT INTO testee
> (protocode,service,sample,normid,proctored)
> VALUES ($1,$2,$3,$4,$5)";
> $result = pg_prepare($cnx,"newtestee",$query);
> pg_execute($cnx,"newtestee",array($protocode,$service,$sample,$normid,
> $proctored));
>
> Have I got this synyax down correctly?

Looks correct to me.


>
> I presume the pg_execute provides the data type information (the
> 'sssss'
> in the MySQL bind-param???

I think the PHP interface sends everything as strings. In general it
just works, but suspect there are cases where you might have to
provide some explicit typing.


>
> I have modified another field (not shown above) as being type
> TIMESTAMP
> DEFAULT now(). I assume I would 'pass over' such fields were they to
> appear in the above example.
>
> In MySQL the '?' placeholder in the INSERT was replaced with:
> current_timestamp().


You would want to leave them out of the insert statement or use the
key word DEFAULT as the value. See the INSERT docs for more details
on this:

http://www.postgresql.org/docs/8.2/interactive/sql-insert.html


>
> Thanks for the 'steer'. A few more coversions and I will develop a
> rhythm of familiarity. For now, I want to avoid any bad habits and
> faulty thinking. Its much more difficult to UNlearn than it is to
> learn
> in the first place.


Here is a PHP class for calling PostgreSQL functions with prepared
statements which might be useful or instructive:

http://pgedit.com/resource/php/pgfuncall



John DeSoi, Ph.D.
http://pgedit.com/
Power Tools for PostgreSQL