[basex-talk] Use xquery:eval in insert statement

[Lauener Jonas]

I want to use xquery:eval in an insert statement:
declare updating function local:insert($document as xs:string, $input as 
element()) {
  insert node $input after xquery:eval(fn:concat($document, '//', 
node-name($input), '[last()]'))
};

let $input := <Customer 
CustomerID="IZZTT"><CompanyName>App</CompanyName><ContactName>Steve 
Jobs</ContactName><ContactTitle>CEO in Heaven</ContactTitle><Phone>(777) 
7777777777</Phone><FullAddress><Address>Apple Road 
3</Address><City>Cuppertino</City><Region>OR</Region><PostalCode>00000</PostalCode><Country>Heaven</Country></FullAddress></Customer>

return local:insert("doc('CustomersOrders.xml')", $input)

On the BaseX GUI it works fine, but if I want to use it with the Java Client, 
it fails. I use this code in Java:
public final class InsertExample {
  /** Hidden default constructor. */
  private InsertExample() {}

  /** Session reference. */
  static ClientSession session;

  /**
   * Main method.
   * @param args command-line arguments
   */
  public static void main(final String[] args) {
    try {
      // Create a client session with host name, port, user name and password
      session = new ClientSession("localhost", 1984, "admin", "admin");

      String command = "declare updating function local:insert($document as 
xs:string, $input as element()) {\n  insert node $input after 
xquery:eval(fn:concat($document, '//', node-name($input), 
'[last()]'))\n};\n\nlet $input := <Customer 
CustomerID=\"IZZTT\"><CompanyName>App</CompanyName><ContactName>Steve 
Jobs</ContactName><ContactTitle>CEO in Heaven</ContactTitle><Phone>(777) 
7777777777</Phone><FullAddress><Address>Apple Road 
3</Address><City>Cuppertino</City><Region>OR</Region><PostalCode>00000</PostalCode><Country>Heaven</Country></FullAddress></Customer>\n\nreturn
 local:insert(\"doc('CustomersOrders')\", $input)";
      System.out.println(command);

      XQuery xquery = new XQuery(command);
      System.out.println(session.execute(xquery));

      // close session
      session.close();
    } catch(IOException e) {
      e.printStackTrace();
    }
  }
}

When I run it, I get this exception:
Version: BaseX 7.6
Java: Oracle Corporation, 1.7.0_11
OS: Windows 8, amd64
Stack Trace: 
java.lang.RuntimeException: Exclusive lock could not be acquired.
  org.basex.util.Util.notexpected(Util.java:53)
  org.basex.io.random.TableDiskAccess.lock(TableDiskAccess.java:151)
  org.basex.data.DiskData.startUpdate(DiskData.java:202)
  org.basex.query.up.DatabaseUpdates.startUpdate(DatabaseUpdates.java:158)
  org.basex.query.up.ContextModifier.apply(ContextModifier.java:86)
  org.basex.query.up.Updates.apply(Updates.java:120)
  org.basex.query.QueryContext.update(QueryContext.java:270)
  org.basex.query.QueryContext.value(QueryContext.java:255)
  org.basex.query.QueryContext.iter(QueryContext.java:240)
  org.basex.query.QueryProcessor.iter(QueryProcessor.java:76)
  org.basex.core.cmd.AQuery.query(AQuery.java:84)
  org.basex.core.cmd.XQuery.run(XQuery.java:22)
  org.basex.core.Command.run(Command.java:342)
  org.basex.core.Command.exec(Command.java:321)
  org.basex.core.Command.execute(Command.java:78)
  org.basex.server.ClientListener.run(ClientListener.java:145)
        at org.basex.server.ClientSession.receive(ClientSession.java:259)
        at org.basex.server.ClientSession.execute(ClientSession.java:162)
        at org.basex.server.ClientSession.execute(ClientSession.java:167)
        at org.basex.server.Session.execute(Session.java:37)
        at org.basex.examples.api.InsertExample.main(InsertExample.java:42)

Is this a bug in BaseX? Or how can I solve this issue?

Thanks,
Jonas
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