[thelist] Weird Thing in Java ResultSets

david.landy at somerfield.co.uk david.landy at somerfield.co.uk
Mon Apr 26 10:37:47 CDT 2004

Hi Everyone,

There was a thread a little while ago about strange problems accessing data
in ASP. 

I'm now experiencing something very similar in Java and thought I'd post a
workaround in case anyone else gets caught by it. 

<tip type="java database access" author="david landy">
When attempting to retrieve field data from a java ResultSet, you may find
that the *second* attempt to retrieve a field for the current row gives you
a "No data found" error.

For example:

String a1 = rs.getString("a"); // retrieves data
String a2 = rs.getString("a"); // --> Error 0: No data found <--

To prevent this occurring, make sure to retrieve the field values of the
current row only once.

Each time the row pointer is moved, by eg calling next(), the field can be
fetched again.

This behavious has been observed on ms-access databases via the jdbc:odbc
bridge, but may not be confined to this configuration.

David Landy, IT Consultant, Business Intelligence
Somerfield/KwikSave Support Centre
Whitchurch, Bristol, UK. Tel: 0117 301 8977
david.landy at somerfield.co.uk <mailto:david.landy at somerfield.co.uk>    
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Marianne Williamson © 1992	

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