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From "Glyn Thomas" <glyntho...@comcast.net>
Subject Problem with Displaying Result of a MySQL Join in Tomcat
Date Sun, 03 Aug 2008 00:02:37 GMT
I am in the process of converting a Tomcat front end for a MySQL database
from

Windows XP to Windows Vista.  

 

The XP version used MySQL Version 5.0.22, Tomcat 5.5.20, JRE 1.5.0 release

12 with Tomcat JDK 4 Compatibility Pack, and J/Connector 5.0.6.

 

The Vista version is using MySQL Version 5.0.51a, Tomcat 5.5.26, JRE

1.6.0_05, and J/Connector 5.1.6.

 

I am unable to display any parts of a result set that are retrieved from

JOINed tables in the Vista version - this works fine in the XP version.  I

already tried converting the queries to use JOIN syntax instead of WHERE

syntax, without improvement. 

 

For example, this query works correctly in the MySQL command line:

 

SELECT

i.ImageID,i.DateDay,i.DateMonth,i.DateYear,i.Location1,i.Location2,i.Scanned

YN,i.MediaID,c.Description as 'Country', s.SubjectID, s.SubjectTypeID,

i.CountryID,i.PhotographerID, i.VolumeNumber FROM image_tbl i JOIN

lu_country_tbl c ON (i.countryid=c.countryid) JOIN xrf_image_subject_tbl si

ON (si.Imageid=i.imageid) JOIN subject_tbl s ON (si.Subjectid=s.subjectid)

WHERE (i.imageid=1234);

 

In JSP, I retrieve the results of this query into an rsImages variable, and

then iterate through the rows using:

 

<c:forEach var="row" items="${rsImage.rows}">

 

Rows that retrieve directly from the image_tbl work correctly e.g.

${row.ImageID} will display the image ID.

 

However, elements from the joined tables, such as ${row.Country} and

${row.SubjectID} don't get retrieved.

 

Any ideas?

 

Thanks,

Glyn Thomas

 

 


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