Re: [basex-talk] XQST0049 error in BaseX 6.1 that did not occur in BaseX 6.0

Hello all,

I could track the problem down to QueryProcessor.reset() not resetting the underlying Context instance. Demo:

//-------------------------------------------------------------------- import org.basex.core.Context; import org.basex.query.QueryProcessor;

public class Test2 {

public static void main(String[] args) throws Exception { final QueryProcessor qp = new QueryProcessor( "declare variable $x := 1; $x", new Context()); qp.parse(); // registers the variable $x with the Context qp.reset(); // sets 'parsed = false;' but doesn't reset the Context qp.parse(); // old definition is found, resulting in an exception }

} //--------------------------------------------------------------------

The problem appears in XQPreparedExpression because executeQuery() resets the internal QueryProcessor after the query has been parsed in the constructor.

Since I found no quick fix for this, I hope Christian or someone else with more BaseX-Fu than me can make use of my observations.

Cheers, Leo

Am 10.07.2010 23:43, schrieb Godmar Back:

The problem persists in 6.1.9.

Here's a minimal test case:

http://top.cs.vt.edu/~gback/bx/Test.java

http://top.cs.vt.edu/~gback/bx/Test.java

import javax.xml.xquery.*;

public class Test { public static void main(String av[]) throws Exception { XQConnection conn = ((XQDataSource)Class.forName("org.basex.api.xqj.BXQDataSource"). newInstance()).getConnection();

    XQPreparedExpression xqp = null;
    String q = "declare variable $x := 1; $x";
    try {
        xqp = conn.prepareExpression(q);
        xqp.executeQuery();
    } catch (XQQueryException xqex) {
        printXQException(xqex, q);
    }
}

public static void printXQException (XQQueryException xquery, String query) {
    String [] lines = query.split("\n");
    System.out.println(lines[Math.min(xquery.getLineNumber() - 1, lines.length - 1)]);
    System.out.println("                                                                                      "
        .substring(0, xquery.getColumnNumber()) + "^");
    System.out.println(xquery);
}

}

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