Bugs item #2834658, was opened at 2009-08-10 03:29
Message generated for change (Comment added) made by shcheklein
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Category: API
Group: Sedna (current)
Status: Open
>Resolution: Accepted
Priority: 5
Private: No
Submitted By: Justin Johansson (justinjohansson)
>Assigned to: Ivan Shcheklein (shcheklein)
Summary: Undesirable newline prepended to SednaSerializedResult items
Initial Comment:
When there is more than one item retrieved via SednaSerializedResult next()
loop, the second and subsequent items have a newline character ( \x0A )
prepended to them.
This is undesirable as it effectively introduces extraneous whitespace before
these strings and it is necessary to then apply a substring function to remove
the first character in order to preserve the correct string length of the
returned items.
The following query expression illustrates this problem:
( 'aa', 'bb', 'cc')
Test code:
SednaSerializedResult prs =
stmt.getSerializedResult();
Vector<String> strs = new Vector<String>( 8);
String pr = prs.next();
int itemNo = 0;
while ( pr != null) {
System.out.println( "SednaSerializedResult item #" +
itemNo + "='" + pr + "'" + "(length=" + pr.length() + ")");
System.out.flush();
strs.add( pr);
pr = prs.next();
++itemNo;
}
return strs;
Output:
SednaSerializedResult item #0='aa'(length=2)
SednaSerializedResult item #1='
bb'(length=3)
SednaSerializedResult item #2='
cc'(length=3)
In this test case, reasonable expectation is that three strings would be
received back with String.length() method returning a value of 2 for each
string as opposed to 2, 3 and 3 respectively.
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>Comment By: Ivan Shcheklein (shcheklein)
Date: 2009-08-15 14:35
Message:
Hi Justin,
This a well know problem of the current (version 3) client-server
protocol. In current implementation Sedna server performs complete result
serialization (including spaces/newlines between items).
Fortunately, new protocol (version 4) initial implementation has been
already commited (see Git Browse). In this version Sedna returns each item
with its XDM type so that serialization can be done on the client's side.
I hope, we'll implement sednadriver2.jar very soon.
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