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Posted to j-users@xalan.apache.org by Tobias McNulty <tm...@datadesk.com> on 2002/03/26 17:34:16 UTC
SQL Extension
Is anyone out there using the SQL Extension for Xalan? I am having
trouble setting up the XSL to bind to Java objects, and the example
doesn't seem to function (I converted it to use the MySQL driver).
Does anyone have a working example that I could try?
In my experience, the example XSL usually generates obscure
NullPointerExceptions or TransformerExceptions during the
transformation.
Thanks,
Toby
--
Tobias McNulty
Data Description, Inc.
840 Hanshaw Road, Suite 9
Ithaca, NY 14850
Phone: (607) 257-1000
E-mail: tmcnulty@datadesk.com
Web: www.datadesk.com
RE: SQL Extension
Posted by Tobias McNulty <tm...@datadesk.com>.
Gary,
I fixed that problem by changing my XSL to look something like:
<xsl:stylesheet ... xmlns:bt="com.foo" extension-element-prefixes="bt">
<xsl:variable name="avar" select="bt:BindTest.new()"/>
<xsl:value-of select="bt:BindTest.myFunc($avar)"/>
The Java binding seems to be very picky. I couldn't get the above
method to work for certain members of the SQL Extension family. In
order to access XConnection.query, I had to subclass XConnection and
make query a static method that took an instance variable as an
argument (I _thought_ Java binding was supposed to do this for you
automatically, but it doesn't seem to do so in all cases).
So I'll ask my original question again: what is the status of the SQL
Extension and/or Java/XSL language binding? Are people using it, or
is it still in the early stages of development?
Much thanks,
Toby
>Toby --
>
>Can't help with the sql:new() at the moment. But, what does your stack
>trace look like from the "Instance method call to method new requires an
>Object instance as first argument" message?
>
>Gary
>
>> -----Original Message-----
>> From: Tobias McNulty [mailto:tmcnulty@datadesk.com]
>> Sent: Tuesday, March 26, 2002 9:46 AM
>> To: xalan-j-users@xml.apache.org
>> Subject: Re: SQL Extension
>>
>>
>> >Is anyone out there using the SQL Extension for Xalan? I am having
>> >trouble setting up the XSL to bind to Java objects, and the example
>> >doesn't seem to function (I converted it to use the MySQL driver).
>> >Does anyone have a working example that I could try?
>> >
>> >In my experience, the example XSL usually generates obscure
>> >NullPointerExceptions or TransformerExceptions during the
>> >transformation.
>> >
>> >Thanks,
>> >Toby
>>
>> It appears that sql:new(...) is returning null (which I assume is
>> because it can't find the driver). The driver has already been
>> (successfully) loaded in pure Java code using the raw JDBC functions.
>> Any idea what's going on here?
>>
>>
>> I am also having some trouble calling instance level methods from
>> XSL. I create a new variable like so:
>>
> > <xsl:variable name="avar" select="bt:new()"/>
>> <xsl:value-of select="bt:myFunc($avar)"/>
>>
>> Where myfunc is an instance-level function of the class referenced by
>> the bt: namespace:
>>
>> <xsl:stylesheet ... xmlns:bt="java:com.foo.BindTest"
> > extension-element-prefixes="bt">
>>
>> Xalan gives me the following error:
>>
>> "Instance method call to method new requires an Object instance as
>> first argument"
>>
>> This would lead me to believe that it's trying to call new() as an
>> instance level method, when it is (I _believe_) a static method (or
>> "pseudo" method, in this case). Do I have to define anything on the
>> Java side to support the method new()?
>>
>> Thanks,
>> Toby
>>
>> --
>> Tobias McNulty
>> Data Description, Inc.
>> 840 Hanshaw Road, Suite 9
>> Ithaca, NY 14850
> > Phone: (607) 257-1000
> > E-mail: tmcnulty@datadesk.com
> > Web: www.datadesk.com
> >
--
Tobias McNulty
Data Description, Inc.
840 Hanshaw Road, Suite 9
Ithaca, NY 14850
Phone: (607) 257-1000
E-mail: tmcnulty@datadesk.com
Web: www.datadesk.com
RE: SQL Extension
Posted by Gary L Peskin <ga...@firstech.com>.
Toby --
Can't help with the sql:new() at the moment. But, what does your stack
trace look like from the "Instance method call to method new requires an
Object instance as first argument" message?
Gary
> -----Original Message-----
> From: Tobias McNulty [mailto:tmcnulty@datadesk.com]
> Sent: Tuesday, March 26, 2002 9:46 AM
> To: xalan-j-users@xml.apache.org
> Subject: Re: SQL Extension
>
>
> >Is anyone out there using the SQL Extension for Xalan? I am having
> >trouble setting up the XSL to bind to Java objects, and the example
> >doesn't seem to function (I converted it to use the MySQL driver).
> >Does anyone have a working example that I could try?
> >
> >In my experience, the example XSL usually generates obscure
> >NullPointerExceptions or TransformerExceptions during the
> >transformation.
> >
> >Thanks,
> >Toby
>
> It appears that sql:new(...) is returning null (which I assume is
> because it can't find the driver). The driver has already been
> (successfully) loaded in pure Java code using the raw JDBC functions.
> Any idea what's going on here?
>
>
> I am also having some trouble calling instance level methods from
> XSL. I create a new variable like so:
>
> <xsl:variable name="avar" select="bt:new()"/>
> <xsl:value-of select="bt:myFunc($avar)"/>
>
> Where myfunc is an instance-level function of the class referenced by
> the bt: namespace:
>
> <xsl:stylesheet ... xmlns:bt="java:com.foo.BindTest"
> extension-element-prefixes="bt">
>
> Xalan gives me the following error:
>
> "Instance method call to method new requires an Object instance as
> first argument"
>
> This would lead me to believe that it's trying to call new() as an
> instance level method, when it is (I _believe_) a static method (or
> "pseudo" method, in this case). Do I have to define anything on the
> Java side to support the method new()?
>
> Thanks,
> Toby
>
> --
> Tobias McNulty
> Data Description, Inc.
> 840 Hanshaw Road, Suite 9
> Ithaca, NY 14850
> Phone: (607) 257-1000
> E-mail: tmcnulty@datadesk.com
> Web: www.datadesk.com
>
Re: SQL Extension
Posted by Tobias McNulty <tm...@datadesk.com>.
>Is anyone out there using the SQL Extension for Xalan? I am having
>trouble setting up the XSL to bind to Java objects, and the example
>doesn't seem to function (I converted it to use the MySQL driver).
>Does anyone have a working example that I could try?
>
>In my experience, the example XSL usually generates obscure
>NullPointerExceptions or TransformerExceptions during the
>transformation.
>
>Thanks,
>Toby
It appears that sql:new(...) is returning null (which I assume is
because it can't find the driver). The driver has already been
(successfully) loaded in pure Java code using the raw JDBC functions.
Any idea what's going on here?
I am also having some trouble calling instance level methods from
XSL. I create a new variable like so:
<xsl:variable name="avar" select="bt:new()"/>
<xsl:value-of select="bt:myFunc($avar)"/>
Where myfunc is an instance-level function of the class referenced by
the bt: namespace:
<xsl:stylesheet ... xmlns:bt="java:com.foo.BindTest"
extension-element-prefixes="bt">
Xalan gives me the following error:
"Instance method call to method new requires an Object instance as
first argument"
This would lead me to believe that it's trying to call new() as an
instance level method, when it is (I _believe_) a static method (or
"pseudo" method, in this case). Do I have to define anything on the
Java side to support the method new()?
Thanks,
Toby
--
Tobias McNulty
Data Description, Inc.
840 Hanshaw Road, Suite 9
Ithaca, NY 14850
Phone: (607) 257-1000
E-mail: tmcnulty@datadesk.com
Web: www.datadesk.com