Hi Pavel,
Some comments inline...
Pavel Bortnovskiy wrote:
Thank you, Rick for your expedient response.
Your comments to DERBY-3946 indicate that I need to apply the patch
and build Derby. Is it possible to avoid? (I am currently using Derby
version 10.5.3.0).
The initial comment on the issue was confusing. This puzzled someone
else last month. I have edited that first comment to make it clear that
the patch was committed a long time ago and was built into both 10.5.1
and 10.5.3. So there is no need to apply the patch.
I tried to compile only TreeWalker.java and ASTParser.java while
linking with Derby's jars, but the build was unsuccessful, as many
classes weren't found.
Would you be able to advise, please?
I am able to compile ASTParser against both the production and debug
jars. Note that ASTParser must be run against the debug jars. I have
added this warning to the initial comment on the JIRA.
Could you include the compiler errors you are seeing? That may help us
diagnose this problem.
Thanks,
-Rick
Thanks,
Pavel.
*Rick Hillegas <[email protected]>*
Sent by: [email protected]
03/09/2010 08:35 AM
Please respond to
"Derby Discussion" <[email protected]>
To
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Subject
Re: Extracting dependencies from SQL statements
Hi Pavel,
I don't know of an easy way to do this. You could run the statement
through the Derby parser to get the parsed representation, the Abstract
Syntax Tree. Then you could write a Visitor to walk the AST, looking for
the nodes which represent tables. See the following JIRAs for some
pointers on how to produce and walk the AST: DERBY-3946 and DERBY-791.
Unfortunately, there is no systematic primer on the AST nodes
themselves. All we have is the javadoc for the package
org.apache.derby.impl.sql.compile.
Hope this helps,
-Rick
Pavel Bortnovskiy wrote:
>
> Hello:
>
> is it possible to use Derby's SQL parser to "extract" dependencies
> from a given SQL statement?
> (or access the parser once the statement has been parsed).
>
> Whether it's a simple SELECT or a JOIN, UNION or a more complex
> statement, I would like to get a list of tables that this statement
> would depend on.
> Looking for FROM clauses and attempting to do the parsing myself seems
> like a difficult, error prone and impractical way to approach this.
>
> Any suggestions, please?
>
> Thanks,
> Pavel.
>
>
>
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