What's a BEI? (EmbedConnection.java)

[myrnap <my...@Golux.Com>]

Hi,

I was poking around and noticed this comment in EmbedConnection.java 
method bootDatabase:
             /*
              If there is a next exception, assume
              that the first one is just a redundant "see the
              next exception" message.
              if it is a BEI, treat it as a database exception.
              If there isn't a BEI, treat it as a java exception.
             */

What's a 'BEI'?

Myrna

Re: Statement Execution

[Daniel John Debrunner <dj...@debrunners.com>]

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Philip Wilder wrote:

> Greetings,
>
> I am attempting to trace a path through the code when someone initiates a
> sql query. Thus Far I have been able to track it down to the
> impl.sql.GenericActivationHolder.execute() method but I can't figure out
> where it goes next.
>
> //It creates a new BaseActivation
> BaseActivation  newAC = (BaseActivation) newGC.newInstance(lcc);
> ...
> //Sets this new BaseActivation to the old one.
> ac = newAC;
> ...
> //Calls the execute function of this activation despite the
> //fact that BaseActivation doesn't have a execute method.
> return ac.execute();
>
> My thought was that perhaps it was calling the execute method of the
> impl.sql.execute.ConstantActionActivation class but such does not
appear to
> be the case.

Each query is compiled into a generated Java class, using bytecode
directly. The execute method is in this generated class. Some
information about the execution can be found in papers and presentations
here:

http://incubator.apache.org/derby/papers/index.html


Dan.
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Statement Execution

[Philip Wilder <05...@acadiau.ca>]

Greetings,

I am attempting to trace a path through the code when someone initiates a
sql query. Thus Far I have been able to track it down to the
impl.sql.GenericActivationHolder.execute() method but I can't figure out
where it goes next.

//It creates a new BaseActivation
BaseActivation  newAC = (BaseActivation) newGC.newInstance(lcc);
...
//Sets this new BaseActivation to the old one.
ac = newAC;
...
//Calls the execute function of this activation despite the
//fact that BaseActivation doesn't have a execute method.
return ac.execute();

My thought was that perhaps it was calling the execute method of the
impl.sql.execute.ConstantActionActivation class but such does not appear to
be the case.

I really appreciate any help anyone can give me, this one is driving me
crazy...

Philip Wilder