I was able to compile both files by disabling SanityManager method
invocation and replacing ContextId.LANG_CONNECTION with its string
"LanguageConnectionContext".
No other changes to ASTParser and TreeWalker have been done, however, when
running them the following exception is thrown:
Parsing:
select a from t, s where t.a = s.a
Exception in thread "main" java.sql.SQLSyntaxErrorException: Table/View
'T' does not exist.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown
Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown
Source)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
Source)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown
Source)
at
org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at
org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at
org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown Source)
at
org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown Source)
at
org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown Source)
at
org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown Source)
at
org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown Source)
at
org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
Source)
at
org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
Source)
at TreeWalker.execute(TreeWalker.java:95)
at TreeWalker.main(TreeWalker.java:79)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.intellij.rt.execution.application.AppMain.main(AppMain.java:110)
Rick Hillegas <richard.hille...@sun.com>
Sent by: richard.hille...@sun.com
03/09/2010 08:35 AM
Please respond to
"Derby Discussion" <derby-user@db.apache.org>
To
Derby Discussion <derby-user@db.apache.org>
cc
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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