Nabble - MetaL Dev

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T22:20:15Z

I already know why it is being set to an empty string: That is simply
what has been stored by the formsgeneration class that I'm using.

I would have expected metastorage to to find that a variable that
should be an integer is actually an empty string, and produce an
error, OR to convert it to NULL. I would not expect it to go on
producing invalid SQL.

But clearly my expectation of metastorage was incorrect.

Thanks again for your help.

Cheers,
Nik.

On 20/09/2008, at 3:16 PM, Manuel Lemos wrote:

> Hello
>
> on 09/20/2008 02:13 AM Nik Sands said the following:
> > Good idea. :-)
> >
> > Below is the last few lines of the var_dump($inventory_item) output.
> > To my inexperienced eye, it appears that it has the value of an
> empty
> > string. Perhaps the real essence of the problem, is that it is being
> > assigned a string rather than an integer?
> >
> > Below that, you can also see the debugoutput. Again, I have to ask
> > why the '?' in the 'PrepareQuery' is not being converted into
> either a
> > legitimate value, nor a NULL in the SQL query? (you said that it
> > should be converted into either one or the other, but it ends up
> being
> > converted into nothing at all, making for invalid SQL).
>
> > ["grams"]=>
> > string(0) ""
>
> As you may see the grams variable is set to an empty string "" and not
> null as it should be. Now you need to check your code to figure why it
> is not being set to null .
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

========================================================
NIXANZ - http://nixanz.com/

Like to help out as a beta tester? Let me know which application
you'd like to test.

[Non-text portions of this message have been removed]

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T22:16:28Z

Hello

on 09/20/2008 02:13 AM Nik Sands said the following:

> Good idea. :-)
>
> Below is the last few lines of the var_dump($inventory_item) output.
> To my inexperienced eye, it appears that it has the value of an empty
> string. Perhaps the real essence of the problem, is that it is being
> assigned a string rather than an integer?
>
> Below that, you can also see the debugoutput. Again, I have to ask
> why the '?' in the 'PrepareQuery' is not being converted into either a
> legitimate value, nor a NULL in the SQL query? (you said that it
> should be converted into either one or the other, but it ends up being
> converted into nothing at all, making for invalid SQL).

> ["grams"]=>
> string(0) ""

As you may see the grams variable is set to an empty string "" and not
null as it should be. Now you need to check your code to figure why it
is not being set to null .

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T22:13:17Z

Good idea. :-)

Below is the last few lines of the var_dump($inventory_item) output.
To my inexperienced eye, it appears that it has the value of an empty
string. Perhaps the real essence of the problem, is that it is being
assigned a string rather than an integer?

Below that, you can also see the debugoutput. Again, I have to ask
why the '?' in the 'PrepareQuery' is not being converted into either a
legitimate value, nor a NULL in the SQL query? (you said that it
should be converted into either one or the other, but it ends up being
converted into nothing at all, making for invalid SQL).

Thanks again for your ongoing dialogue on this issue. Even if I've
been doing things incorrectly, I do want to fully understand why.

Cheers,
Nik.

-----------------------------------------------

["pending"]=>
int(0)
["id"]=>
int(1105)
["notes"]=>
string(0) ""
["mandatory"]=>
int(0)
["shared"]=>
int(0)
["calculation"]=>
string(0) ""
["sort"]=>
int(1)
["description"]=>
string(0) ""
["grams"]=>
string(0) ""
["item"]=>
int(1)
["inventory"]=>
int(82)
}

FACTORY DEBUG:

1 Query: SELECT person.id, person.external_user_id, person.name FROM
person WHERE person.external_user_id=2
1 Query: SELECT inventory.id, inventory.name, inventory.description,
inventory.person FROM inventory WHERE id=82
1 Query: SELECT walk.id, walk.name, walk.date, walk.persons,
walk.days, walk.inventory FROM walk WHERE inventory=82
1 Query: SELECT inventory_item.id, inventory_item.notes,
inventory_item.mandatory, inventory_item.shared,
inventory_item.calculation, inventory_item.sort,
inventory_item.description, inventory_item.grams, inventory_item.item,
inventory_item.inventory FROM inventory_item WHERE inventory=82
1 PrepareQuery: UPDATE inventory_item SET notes=?, mandatory=?,
shared=?, calculation=?, sort=?, description=?, grams=?, item=?,
inventory=? WHERE id=?
1 Query: UPDATE inventory_item SET notes='', mandatory='N',
shared='N', calculation='', sort=1, description='', grams=, item=1,
inventory=82 WHERE id=1105
1 Query error: You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to
use near ' item=1, inventory=82 WHERE id=1105' at line 1

-----------------------------------------------

On 20/09/2008, at 2:51 PM, Manuel Lemos wrote:

> Hello,
>
> on 09/20/2008 01:11 AM Nik Sands said the following:
> > But you said that a '?' in a PrepareQuery should be converted to
> > either an SQL NULL, or to a valid value in the actual Query.
> >
> > This is not happening in this case.
>
> If you look at the generated code you can see this for setting the
> prepared query parameter of the grams field.
>
> if(IsSet($this->grams))
> {
> MetabaseQuerySetInteger($this->database,$statement,7,$this->grams);
> }
> else
> MetabaseQuerySetNull($this->database,$statement,7,'integer');
>
> Maybe you think you are doing the things correctly, but you are not.
>
> Try using var_dump($inventory_item); before calling
> $inventory_item->save(); and show the results here so we can double
> check that the grams variable is really set to null or undefined.
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T21:51:40Z

Hello,

on 09/20/2008 01:11 AM Nik Sands said the following:
> But you said that a '?' in a PrepareQuery should be converted to
> either an SQL NULL, or to a valid value in the actual Query.
>
> This is not happening in this case.

If you look at the generated code you can see this for setting the
prepared query parameter of the grams field.

if(IsSet($this->grams))
{
MetabaseQuerySetInteger($this->database,$statement,7,$this->grams);
}
else
MetabaseQuerySetNull($this->database,$statement,7,'integer');

Maybe you think you are doing the things correctly, but you are not.

Try using var_dump($inventory_item); before calling
$inventory_item->save(); and show the results here so we can double
check that the grams variable is really set to null or undefined.

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T21:11:21Z

But you said that a '?' in a PrepareQuery should be converted to
either an SQL NULL, or to a valid value in the actual Query.

This is not happening in this case.

On 20/09/2008, at 11:45 AM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 07:52 PM Nik Sands said the following:
> > oops, sorry, I'll try again (and copy/paste as well)...
>
> I generated the code of the class and it is correct. If you set the
> grams variable to null or unset it, it will be set a NULL on the
> database record. Keep in mind that you need to set the value to PHP
> null
> constant, not to "null" string.
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T18:45:07Z

Hello,

on 09/19/2008 07:52 PM Nik Sands said the following:
> oops, sorry, I'll try again (and copy/paste as well)...

I generated the code of the class and it is correct. If you set the
grams variable to null or unset it, it will be set a NULL on the
database record. Keep in mind that you need to set the value to PHP null
constant, not to "null" string.

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T15:52:21Z

oops, sorry, I'll try again (and copy/paste as well)...

<class>

<name>inventory_item</name>

<variable>
<name>notes</name>
<type>text</type>
<optional>1</optional>
</variable>

<variable>
<name>mandatory</name>
<type>boolean</type>
</variable>

<variable>
<name>shared</name>
<type>boolean</type>
</variable>

<variable>
<name>calculation</name>
<type>text</type>
<optional>1</optional>
</variable>

<variable>
<name>sort</name>
<type>integer</type>
<optional>1</optional>
</variable>

<variable>
<name>description</name>
<type>text</type>
<optional>1</optional>
</variable>

<variable>
<name>grams</name>
<type>integer</type>
<optional>1</optional>
</variable>

<variable>
<name>item</name>
<class>item</class>
</variable>

<variable>
<name>inventory</name>
<class>inventory</class>
</variable>

<function>
<name>save</name>
<type>persist</type>
</function>

<function>
<name>delete</name>
<type>delete</type>
</function>

<function>
<name>validate</name>
<type>validate</type>
<parameters>
<errorcode>
<argument>errorcode</argument>
</errorcode>
</parameters>
</function>

<function>
<name>set_inventory</name>
<type>setreference</type>
<parameters>
<variable>inventory</variable>
<reference>
<argument>inventory</argument>
</reference>
</parameters>
</function>

<function>
<name>set_item</name>
<type>setreference</type>
<parameters>
<variable>item</variable>
<reference>
<argument>item</argument>
</reference>
</parameters>
</function>

<function>
<name>get_inventory</name>
<type>getreference</type>
<parameters>
<variable>inventory</variable>
</parameters>
</function>

<function>
<name>get_item</name>
<type>getreference</type>
<parameters>
<variable>item</variable>
</parameters>
</function>

</class>

On 20/09/2008, at 8:42 AM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 07:24 PM Nik Sands said the following:
> > Hi Manuel,
> >
> > Thanks for looking at this for me. The class definition is attached
> > to this email.
> >
> > The '?' is not getting replaced by a value, or by NULL, which is the
> > problem.
>
> It seems not file was attached to the message. Can you paste the class
> definition so I can try to reproduce your problem?
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

========================================================
NIK SANDS - Systems Administrator, IT Services, University of
Tasmania, Australia
Phone: +61-3-63243732 (BH)
AIM / iChat: brassnix

========================================================
NIXANZ - http://nixanz.com/

Like to help out as a beta tester? Let me know which application
you'd like to test.

[Non-text portions of this message have been removed]

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T15:42:30Z

Hello,

on 09/19/2008 07:24 PM Nik Sands said the following:
> Hi Manuel,
>
> Thanks for looking at this for me. The class definition is attached
> to this email.
>
> The '?' is not getting replaced by a value, or by NULL, which is the
> problem.

It seems not file was attached to the message. Can you paste the class
definition so I can try to reproduce your problem?

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T15:24:57Z

Hi Manuel,

Thanks for looking at this for me. The class definition is attached
to this email.

The '?' is not getting replaced by a value, or by NULL, which is the
problem.

Cheers,
Nik.

On 20/09/2008, at 6:44 AM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 06:39 AM Nik Sands said the following:
> > but in the situation I showed in my last example, it produces
> invalid
> > SQL. Shouldn't this be avoided, no matter what the value of the
> > variable?
> >
> > Metastorage knew the variable had no valid value (hence it
> displaying
> > the "?" in the "PrepareQuery" line of the debug output), shouldn't
> it
> > be doing something with that invalid value? (Eg, set it to NULL in
> > SQL, or report an error and don't run any SQL)
>
> ? in the prepared query is just a place holder that will be placed by
> the real value when the query is executed. If the variable is set to a
> value, ? is replaced by the value. Otherwise it is replaced by NULL.
>
> It should not give any errors if you set the variable to null .
>
> Anyway, just send me your class definition in the component format
> so I
> can check what may not be right.
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T13:44:38Z

Hello,

on 09/19/2008 06:39 AM Nik Sands said the following:
> but in the situation I showed in my last example, it produces invalid
> SQL. Shouldn't this be avoided, no matter what the value of the
> variable?
>
> Metastorage knew the variable had no valid value (hence it displaying
> the "?" in the "PrepareQuery" line of the debug output), shouldn't it
> be doing something with that invalid value? (Eg, set it to NULL in
> SQL, or report an error and don't run any SQL)

? in the prepared query is just a place holder that will be placed by
the real value when the query is executed. If the variable is set to a
value, ? is replaced by the value. Otherwise it is replaced by NULL.

It should not give any errors if you set the variable to null .

Anyway, just send me your class definition in the component format so I
can check what may not be right.

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T02:39:21Z

but in the situation I showed in my last example, it produces invalid
SQL. Shouldn't this be avoided, no matter what the value of the
variable?

Metastorage knew the variable had no valid value (hence it displaying
the "?" in the "PrepareQuery" line of the debug output), shouldn't it
be doing something with that invalid value? (Eg, set it to NULL in
SQL, or report an error and don't run any SQL)

On 19/09/2008, at 5:47 PM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 04:25 AM Nik Sands said the following:
> > Is metastorage NOT supposed to replace this with a NULL in the SQL
> in
> > this case?
> >
> > Is metastorage SUPPOSED to produce invalid SQL in this instance?
> > Shouldn't it instead be either substituting a NULL in the SQL? Or
> > otherwise producing an error in the 'persist' routine before
> trying to
> > run invalid SQL?
>
> I am not sure what you mean. The code generate by Metastorage sets the
> field to NULL if you set the respective optional variable to null or
> just not assign any value to it.
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T00:47:38Z

Hello,

on 09/19/2008 04:25 AM Nik Sands said the following:
> Is metastorage NOT supposed to replace this with a NULL in the SQL in
> this case?
>
> Is metastorage SUPPOSED to produce invalid SQL in this instance?
> Shouldn't it instead be either substituting a NULL in the SQL? Or
> otherwise producing an error in the 'persist' routine before trying to
> run invalid SQL?

I am not sure what you mean. The code generate by Metastorage sets the
field to NULL if you set the respective optional variable to null or
just not assign any value to it.

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-19T00:25:13Z

Hi Manuel,

Thanks for your help...

Is metastorage NOT supposed to replace this with a NULL in the SQL in
this case?

Is metastorage SUPPOSED to produce invalid SQL in this instance?
Shouldn't it instead be either substituting a NULL in the SQL? Or
otherwise producing an error in the 'persist' routine before trying to
run invalid SQL?

In any case, thanks for the advice on the preferred way of handling
the situation - I'll give it a try. It's unfortunate that it is
necessary, but it should do the job for now.

Cheers,
Nik.

On 19/09/2008, at 4:23 PM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 02:01 AM Nik Sands said the following:
> > The code immediately below fails to save (and gives the debug output
> > shown below), but if I uncomment the two "Work around" lines, it
> saves
> > successfully. Why is this?
> >
> > The debug output is the same as posted earlier in this topic.
>
> I think there is some confusion. An empty string is one thing. An
> undefined value is another thing.
>
> > $grams = $form->GetInputValue("item_".$id."_grams");
> > if ( IsSet($grams) )
>
> The above should be:
>
> if(strlen($grams))
>
> > $inventory_item->grams = $grams;
> > else
> > $inventory_item->grams = null;
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-18T23:23:20Z

Hello,

on 09/19/2008 02:01 AM Nik Sands said the following:
> The code immediately below fails to save (and gives the debug output
> shown below), but if I uncomment the two "Work around" lines, it saves
> successfully. Why is this?
>
> The debug output is the same as posted earlier in this topic.

I think there is some confusion. An empty string is one thing. An
undefined value is another thing.

> $grams = $form->GetInputValue("item_".$id."_grams");
> if ( IsSet($grams) )

The above should be:

if(strlen($grams))

> $inventory_item->grams = $grams;
> else
> $inventory_item->grams = null;

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-18T22:01:53Z

Sorry, my last email was probably not very clear. Let me try
again... :-)

The code immediately below fails to save (and gives the debug output
shown below), but if I uncomment the two "Work around" lines, it saves
successfully. Why is this?

The debug output is the same as posted earlier in this topic.

Cheers,
Nik.

$grams = $form->GetInputValue("item_".$id."_grams");
if ( IsSet($grams) )
$inventory_item->grams = $grams;
else
$inventory_item->grams = null;

// Work around metastorage invalid SQL issue
//if ( ! $inventory_item->grams )
// $inventory_item->grams = null;

if ( ! $inventory_item->save() )
exit_error("Failed to save data for inventory item '".
$inventory_item->id."'");

On 19/09/2008, at 2:35 PM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 01:33 AM Nik Sands said the following:
> > it is optional:
> >
> > ...
> > <variable>
> > <name>grams</name>
> > <type>integer</type>
> > <optional>1</optional>
> > </variable>
> > ...
> >
> > It is being assigned immediately before the save() as follows:
> >
> > $inventory_item->grams = $form->GetInputValue("item_".$id."_grams");
> >
> > In this case, it is being assigned an empty value.
>
> That is the problem. If it is empty, don't assign it or set it to
> null .
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-18T21:48:14Z

I thought metastorage was supposed to set it to NULL when generating
the SQL automatically?

The debug output shows it as being a '?' in the prepared query, but
nothing in the finaly query.

Does this mean I have to check for empty values on every single
assignment in metastorage???

Anyhow, I've tried this as follows, and it still doesn't work (still
produces the same debug output):

$grams = $form->GetInputValue("item_".$id."_grams");
if ( IsSet($grams) )
$inventory_item->grams = $form->GetInputValue("item_".
$id."_grams");

if ( ! $inventory_item->save() )
{
exit_error("Failed to save data for inventory item '".
$inventory_item->id."'");
}

On 19/09/2008, at 2:35 PM, Manuel Lemos wrote:

Re: Metastorage 'persist' function producing invalid SQL

2008-09-18T21:35:13Z

Hello,

on 09/19/2008 01:33 AM Nik Sands said the following:

> it is optional:
>
> ...
> <variable>
> <name>grams</name>
> <type>integer</type>
> <optional>1</optional>
> </variable>
> ...
>
> It is being assigned immediately before the save() as follows:
>
> $inventory_item->grams = $form->GetInputValue("item_".$id."_grams");
>
> In this case, it is being assigned an empty value.

That is the problem. If it is empty, don't assign it or set it to null .

--

Regards,
Manuel Lemos

Find and post PHP jobs
http://www.phpclasses.org/jobs/

PHP Classes - Free ready to use OOP components written in PHP
http://www.phpclasses.org/

Re: Metastorage 'persist' function producing invalid SQL

2008-09-18T21:33:27Z

it is optional:

...
<variable>
<name>grams</name>
<type>integer</type>
<optional>1</optional>
</variable>
...

It is being assigned immediately before the save() as follows:

$inventory_item->grams = $form->GetInputValue("item_".$id."_grams");

In this case, it is being assigned an empty value.

On 19/09/2008, at 2:24 PM, Manuel Lemos wrote:

> Hello,
>
> on 09/19/2008 01:13 AM nixanz said the following:
> > 1 PrepareQuery: UPDATE inventory_item SET notes=?, mandatory=?,
> > shared=?, calculation=?, sort=?, description=?, grams=?, item=?,
> > inventory=? WHERE id=?
> > 1 Query: UPDATE inventory_item SET notes='', mandatory='N',
> > shared='N', calculation='', sort=1, description='', grams=, item=10,
> > inventory=75 WHERE id=792
> > 1 Query error: You have an error in your SQL syntax; check the
> manual
> > that corresponds to your MySQL server version for the right syntax
> to
> > use near ' item=10, inventory=75 WHERE id=792' at line 1
> >
> > You can clearly see that the 'grams' field in the 'PrepareQuery' is
> > '?' (ie, 'grams' has not yet been defined for this object), but in
> the
> > 'Query' line below that, the 'grams' is simply blank. I was under
> the
> > impression that Metastorage should be making it a 'NULL'.
> >
> > Is this what is supposed to happen?
> >
> > Or do I have to manually check each and every field every time
> before
> > I 'persist'?
>
> If the variable can be set to NULL, it means it is optional. Are you
> defining it as <optional>1</optional> ?
>
> The generated class should fail the persist function if you do not set
> it to optional and you do not initialize its value. Are you assigning
> the variable value to something?
>
> --
>
> Regards,
> Manuel Lemos
>
> Find and post PHP jobs
> http://www.phpclasses.org/jobs/
>
> PHP Classes - Free ready to use OOP components written in PHP
> http://www.phpclasses.org/
>
>

Re: Metastorage 'persist' function producing invalid SQL

2008-09-18T21:24:03Z

Hello,

on 09/19/2008 01:13 AM nixanz said the following:

> 1 PrepareQuery: UPDATE inventory_item SET notes=?, mandatory=?,
> shared=?, calculation=?, sort=?, description=?, grams=?, item=?,
> inventory=? WHERE id=?
> 1 Query: UPDATE inventory_item SET notes='', mandatory='N',
> shared='N', calculation='', sort=1, description='', grams=, item=10,
> inventory=75 WHERE id=792
> 1 Query error: You have an error in your SQL syntax; check the manual
> that corresponds to your MySQL server version for the right syntax to
> use near ' item=10, inventory=75 WHERE id=792' at line 1
>
> You can clearly see that the 'grams' field in the 'PrepareQuery' is
> '?' (ie, 'grams' has not yet been defined for this object), but in the
> 'Query' line below that, the 'grams' is simply blank. I was under the
> impression that Metastorage should be making it a 'NULL'.
>
> Is this what is supposed to happen?
>
> Or do I have to manually check each and every field every time before
> I 'persist'?

If the variable can be set to NULL, it means it is optional. Are you
defining it as <optional>1</optional> ?

The generated class should fail the persist function if you do not set
it to optional and you do not initialize its value. Are you assigning
the variable value to something?

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Metastorage 'persist' function producing invalid SQL

2008-09-18T21:13:31Z

I'm new to Metastorage, so forgive me if I've overlooked something
obvious. Anyhow, I can't get my persist function to work reliably.
I've using the same function for the same class in several places, and
it works correctly in most cases, but in one particular spot, it
always fails with a "You have an error in your SQL syntax..." error.

I've got debugging turned on, and the debugging output is:

1 Query: SELECT person.id, person.external_user_id, person.name FROM
person WHERE person.external_user_id=2
1 Query: SELECT inventory.id, inventory.name, inventory.description,
inventory.person FROM inventory WHERE id=75
1 Query: SELECT walk.id, walk.name, walk.date, walk.persons,
walk.days, walk.inventory FROM walk WHERE inventory=75
1 Query: SELECT inventory_item.id, inventory_item.notes,
inventory_item.mandatory, inventory_item.shared,
inventory_item.calculation, inventory_item.sort,
inventory_item.description, inventory_item.grams, inventory_item.item,
inventory_item.inventory FROM inventory_item WHERE inventory=75
1 PrepareQuery: UPDATE inventory_item SET notes=?, mandatory=?,
shared=?, calculation=?, sort=?, description=?, grams=?, item=?,
inventory=? WHERE id=?
1 Query: UPDATE inventory_item SET notes='', mandatory='N',
shared='N', calculation='', sort=1, description='', grams=, item=10,
inventory=75 WHERE id=792
1 Query error: You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to
use near ' item=10, inventory=75 WHERE id=792' at line 1

You can clearly see that the 'grams' field in the 'PrepareQuery' is
'?' (ie, 'grams' has not yet been defined for this object), but in the
'Query' line below that, the 'grams' is simply blank. I was under the
impression that Metastorage should be making it a 'NULL'.

Is this what is supposed to happen?

Or do I have to manually check each and every field every time before
I 'persist'?

Re: Converting PHP, Perl, Python, etc to Metal?

2008-05-28T00:13:13Z

Hello,

on 05/24/2008 05:54 PM Kelly Jones said the following:

> Are there tools to convert PHP/Perl/Python/etc to Metal?
>
> When I see:
>
> function addargs ($x,$y) {$z=$x+y; return $z;}
>
> I think (using brackets because some mail clients don't like angle brackets):
>
> [function name="addargs"]
> [arglist]
> [arg name="x" type="unknown"]
> [arg name="y" type="unknown"]
> [/arglist]
> [body]
> [line]z=x+y[/line]
> [return]z[/return]
> [/body]
> [/function]
>
> I realize that's not perfect Metal, but you get the idea.
>
> I know PHP/Perl etc all have a "lexical/tokenizing" step when they're
> compiled-- could they be converted to Metal at that step?

AFAIK there are no tools for converting between languages. It is a
possibility, but the MetaL project did not went into that direction.

Nowadays, most of the development has been done on the persistence
module which the base of Metastorage ORM code generation tool.

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Converting PHP, Perl, Python, etc to Metal?

2008-05-24T13:54:16Z

Are there tools to convert PHP/Perl/Python/etc to Metal?

When I see:

function addargs ($x,$y) {$z=$x+y; return $z;}

I think (using brackets because some mail clients don't like angle brackets):

[function name="addargs"]
[arglist]
[arg name="x" type="unknown"]
[arg name="y" type="unknown"]
[/arglist]
[body]
[line]z=x+y[/line]
[return]z[/return]
[/body]
[/function]

I realize that's not perfect Metal, but you get the idea.

I know PHP/Perl etc all have a "lexical/tokenizing" step when they're
compiled-- could they be converted to Metal at that step?

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Re: obj. relations question

2008-04-21T15:41:12Z

Hello,

on 04/21/2008 08:12 AM Sergey Klenin said the following:
> I feel like I'm inventing a wheel because it seems I'm trying to do the thing that is always done.
> I see that it will be meta meta system, but how to handle my needs in more effective way?
> Maybe the way I'm trying to solve this problem now is fundamentaly mistaken and I have to use native metastorage capabilities to achieve end user fuctionality?
> In short, I'm stuck.

This is a bit confusing, not because of your definitions, but rather
because you do not tell me what exactly what you want to do and you are
not able to do it.

Anyway, if you want a meta type system, first you need to have classes
that describe your types. Then you to have classes that store the type
values.

You separated each thing in two components but that is inconvenient
because the factory of one component will not be able to fetch objects
of the other component. You can pass OID back and forth but that may be
a drag.

Anyway, I think first you should design a class model with some UML tool
like Umbrello or others, than you move on to the model implementation
using Metastorage.

Once you have your model diagram ready it is easier to see what do you
want to do and what your model is not allowing, so I can advise. So,
just design your model and show your diagram when you get stuck.

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obj. relations question

2008-04-21T04:12:19Z

Hello, Manuael and everybody,

I have the question regarding how to set up classes relationship.

I'm designing the system that must provide to end user the capabilities to describe and create custom object types.
Such objects may have custom variables, validators, behaviour etc.

I have 2 components named 'Object_prototypes' and 'Object_instances' (verbose names here for simplicity).

Object_prototypes contains metadata for future object that will be created by end user.
Among of all this component contains class called 'Properties' that describes properties of certain object (created by end user).
Fragment of 'Object_prototypes' definition:

<component>
<name>Object_prototypes</name>
...
<class>
<name>Objects</name>
...
<variable>
<name>title</name>
<type>text</type>
</variable>

<collection>
<name>properties</name>
<class>Properties</class>
<reference>title</reference>
</collection>
</class>
...
<class>
<name>Properties</name>

<variable>
<name>title</name>
<type>text</type>
</variable>

<collection>
<name>type</name>
<class>property_type</class> 
<reference>type</reference>
</collection>

<variable>
<name>value</name>
<type>text</type>
</variable>

<variable>
<name>default_value</name>
<type>text</type>
</variable>
</class>
...
</component>

Further, the component 'Object_instances' will contains object instances created by end user based on one of 'Object_prototypes' class object.
Each object must have its own set of properties regarding to template this object based on.
The instance of object of certain type may have 'private' value of any property either must take default value from 'prototype' if private value not specified.

Fragment of 'Object_instances' definition:

<component>
<name>Object_instances</name>
...
<class>
<name>Instance</name>

<variable>
<name>title</name>
<type>text</type>
</variable>

<variable>
<name>template</name>
<component>Object_prototypes</component>
<class>Objects</class>
</variable>

<collection>
<name>properties</name>
<class>instance_properties</class>
<reference>title</reference>
</collection>
</class>

<class>
<name>instance_properties</name>


<variable>
<name>property</name>
<component>Object_prototypes</component>
<class>Properties</class>
</variable>

<variable>
<name>value</name>
<type>text</type>
</variable>
</class>
...
</component>

I feel like I'm inventing a wheel because it seems I'm trying to do the thing that is always done.
I see that it will be meta meta system, but how to handle my needs in more effective way?
Maybe the way I'm trying to solve this problem now is fundamentaly mistaken and I have to use native metastorage capabilities to achieve end user fuctionality?
In short, I'm stuck.

Besr regards,
Sergey Klenin

[Non-text portions of this message have been removed]

Re: defining external components

2008-03-15T02:40:07Z

Hello,

on 03/13/2008 09:28 AM Miguel Oliveira said the following:
> My application, metastorage-based, is growing every day, and the main
> persistent component is getting bigger.
>
> In order do organize code and data flow, i'm planning to create
> external components to increase productivity.
>
> So, i was wondering if, when creating external components,
> metastorage will create other databases or will assume that future
> components will be added to the main component database.

No, Metastorage generates different schema definitions for each
component, but you can configure the schema installation classes to
install all component schemas in the same database.

> Also, maybe this dobt doesn't make much sense, but can i create the
> main component just for reference external components? Will this
> affect all my code and database, or metastorage will mantain database
> and a a main class will work as an interface layer class?

I am not sure what you mean. If you have a large application, it is
better to make it modular, so each module can run without code from most
other modules.

If you define different components for each module, most of the time you
only need to load the generated code for the components used in each module.

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defining external components

2008-03-13T05:28:40Z

Hello,

My application, metastorage-based, is growing every day, and the main
persistent component is getting bigger.

In order do organize code and data flow, i'm planning to create
external components to increase productivity.

So, i was wondering if, when creating external components,
metastorage will create other databases or will assume that future
components will be added to the main component database.

Also, maybe this dobt doesn't make much sense, but can i create the
main component just for reference external components? Will this
affect all my code and database, or metastorage will mantain database
and a a main class will work as an interface layer class?

Thanks in advance,
miguel

Re: setreference for foreign keys in 1-to-1 relationshipship

2008-02-21T12:06:44Z

Hello,

on 02/21/2008 11:32 AM Miguel Oliveira said the following:
> I've created 2 object factory functions of type createobject, one for
> each class of user and profile. But it returns that a missing
> argument is missing, which is the profile_id and user_id.

Yes, you need to make those variables optional to be allowed to save the
object without setting them to a reference object.

Since the classes reference each other, you need to make at least one of
the variables optional.

> As it sustends 'applications should not access reference variables
> directly to manipulate the respective objects. Instead you should
> declare and use functions of type setreference and getreference to
> assign or retrieve the related objects by storing or de-referencing
> the respective OID. '
>
> And:
>
> 'Applications should not access reference variables directly to
> manipulate the respective objects. Instead you should declare and use
> functions of type setreference and getreference to assign or retrieve
> the related objects by storing or de-referencing the respective OID.
> See the section ahead about defining data objects functions to learn
> how to declare and use this type of functions.'
>
> How can i create object user and profile and set references in a form
> of 1-to-1 relationship? Like this?
>
> <function>
> <name>setprofileid</name>
> <type>setreference</type>
> <parameters>
> <variable>profile_id</variable>
> <reference>
> <argument>profile</argument>
> </reference>
> </parameters>
> </function>
>
> <function>
> <name>setuserid</name>
> <type>setreference</type>
> <parameters>
> <variable>user_id</variable>
> <reference>
> <argument>user</argument>
> </reference>
> </parameters>
> </function>

Yes, that is it. You just need to add the functions the respective classes.

> Also, should i call these functions before persist the database?

Of course.

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setreference for foreign keys in 1-to-1 relationshipship

2008-02-21T06:32:12Z

Hello,

I was wondering how can i solve the creation of 2 objects with an 1-
to-1 relationship. Using this example class:

<class>

<name>user</name>

<variable>
<name>profile_id</name>
<class>profile</class>
</variable>

</class>

and...

<class>

<name>profile</name>

<variable>
<name>user_id</name>
<class>user</class>
</variable>

</class>

I've created 2 object factory functions of type createobject, one for
each class of user and profile. But it returns that a missing
argument is missing, which is the profile_id and user_id.

As it sustends 'applications should not access reference variables
directly to manipulate the respective objects. Instead you should
declare and use functions of type setreference and getreference to
assign or retrieve the related objects by storing or de-referencing
the respective OID. '

And:

'Applications should not access reference variables directly to
manipulate the respective objects. Instead you should declare and use
functions of type setreference and getreference to assign or retrieve
the related objects by storing or de-referencing the respective OID.
See the section ahead about defining data objects functions to learn
how to declare and use this type of functions.'

How can i create object user and profile and set references in a form
of 1-to-1 relationship? Like this?

<function>
<name>setprofileid</name>
<type>setreference</type>
<parameters>
<variable>profile_id</variable>
<reference>
<argument>profile</argument>
</reference>
</parameters>
</function>

<function>
<name>setuserid</name>
<type>setreference</type>
<parameters>
<variable>user_id</variable>
<reference>
<argument>user</argument>
</reference>
</parameters>
</function>

Also, should i call these functions before persist the database?

Thanks in advance,

regards,
miguel

Re: metastorage: how to set an unique one-to-one relation between two classes

2008-02-17T20:21:56Z

Hello,

on 02/17/2008 11:05 AM Miguel Oliveira said the following:

> Hello,
>
> I've started using metastorage and create my component to generate
> the db schema:
>
>
> <class>
> <name>users</name>
>
> ....
> <variable>
> <name>profile_id</name>
> <class>profiles</class>
> </variable>
> </class>
>
> also,
>
> <class>
> <name>profile</name>
>
> ....
> <variable>
> <name>user_id</name>
> <class>users</class>
> </variable>
> </class>
>
> Webstorage generate the output schema and manipulation files and
> further, metastorage create the db.
>
> My doubt consists in this: When adding a new user record it should
> have an associated profile(mandatory). The fields user_id and
> profile_id in database are not defined as 'not null' as i think they
> suppose to be.

Yes, I was trying to remember what was the exact reasoning to not make
reference variables not null, but I am not sure.

I know that some databases require that not null fields have an explicit
default value to override the NULL default value. I guess I could make
the default 0 even though it will never be used for non-optional variables.

Anyway, for now you do not need to be concerned because if for some
reason your application is not setting a reference variable to an
existing object, the class persist function will fail telling you that
the variable needs to be initialized.

> Is in metabase any way to make those fields 'not null'? I've seen
> documentation regarding to references, getreference, setreference but
> i'm not sure if this should be used or not.
>
> Because i'll need to check user settings and access policy, should i
> create functions to get id's in the component?

By default all variables are non-optional (NOT NULL), so you need to
initialize them to some value. If you want to make a variable accept
NULL, you need to set the <optional>1</optional> parameter of the
variable definition.

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metastorage: how to set an unique one-to-one relation between two classes

2008-02-17T06:05:03Z

Hello,

I've started using metastorage and create my component to generate
the db schema:

<class>
<name>users</name>

....
<variable>
<name>profile_id</name>
<class>profiles</class>
</variable>
</class>

also,

<class>
<name>profile</name>

....
<variable>
<name>user_id</name>
<class>users</class>
</variable>
</class>

Webstorage generate the output schema and manipulation files and
further, metastorage create the db.

My doubt consists in this: When adding a new user record it should
have an associated profile(mandatory). The fields user_id and
profile_id in database are not defined as 'not null' as i think they
suppose to be.

Is in metabase any way to make those fields 'not null'? I've seen
documentation regarding to references, getreference, setreference but
i'm not sure if this should be used or not.

Because i'll need to check user settings and access policy, should i
create functions to get id's in the component?

regards,
miguel

Nested component transactions

2008-02-15T17:48:31Z

Hello,

I have not made many Metastorage releases recently but I made some
developments in Metabase that provide flexibility to Metastorage
generated components.

Some applications may need to use classes of multiple components at the
same time, like for instance a blog component may use a forum component
to implement blog comments.

However, if both components start transactions, previously Metabase
would fail complaining that a transaction was already started when the
second component starts the transaction.

In the latest revision of Metastorage, nested transactions are allowed.
This means that when the second component starts a transaction, nothing
happens, the transaction started by the first continues.

When the second component ends a transaction, with either a commit or a
rollback implemented by a factory function of type finishtransaction,
nothing happens either. The transaction is only ended when the outer
component finishes the transaction.

Note that if an inner component requests to end a transaction by
commiting it, the outer component must also do the same consistently,
ie. request to commit the transaction. Likewise, if the inner component
request to rollback the transaction, the outer component must also
rollback the transaction.

Otherwise, Metabase will fail with an error and the transaction is
always rolled back because partial transactions are not supported and so
there is a consistency bug in your application.

If you never have mixed multiple components in an application, never
mind, you do not need to worry about these details.

For now, the version of Metabase that supports nested transactions is
available only from CVS:

http://www.meta-language.net/download.html#snapshots

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Object cloning

2007-09-19T12:19:40Z

Hello,

A new version of Metastorage was released to introduce a new capability
of creating copies of existing persistent objects. Other minor features
and bug fixes were made available with this release.

Here is the complete news announcement:

http://www.meta-language.net/news-2007-09-19-metastorage.html

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createobject forms with variables of types boolean, integer, decimal, float

2007-06-10T04:03:49Z

Add support to createobject forms for classes with variables of types boolean, integer, decimal, float.

q

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Re: Re: Custom Identifier - how does it work?

2007-03-21T18:44:07Z

Hello,

on 03/21/2007 05:17 AM manfred.schreck said the following:

> --- In metal-dev@..., Manuel Lemos <mlemos@...> wrote:
>> Hello,
>>
>> on 03/20/2007 05:32 AM manfred.schreck said the following:
>>> Hello,
>>>
>>> I am using Metabase for a while, and I am happy with it.
>>> Now I am in a situation, that I have to use a custom identifier.
> The
>>> scenario is that I use Metabase to synchronize data between
> existing
>>> db/php app and a newly created web application. The existing app
>>> cannot be changed, and a table containing user information has a
>>> login filed as the primary key. An id field cannot be added.
>>>
>>> Now my question: How can I get Metabase to work with a field
> login
>>> insted of id?
>> I am a bit confused with your references to Metabase.
>>
>> Do you mean you have an application using Metabase and you want to
>> integrate with something that uses classes generated by
> Metastorage?

> sorry I meant Metastorage.

Currently Metastorage does not support defining custom object identifier
(OID) variables. For now, an implicit OID is assigned to automatic
variable id .

However it is already in my todo list to add support custom OID. Not
only you will be specify another variable as OID, but you also be
allowed to specify more than one OID variable to achieve composite
primary keys. Please be patient.

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