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From Robert Zeigler <>
Subject Re: 2.x, custom (enum) types, mysql, and in expressions?
Date Tue, 24 Jul 2007 20:19:57 GMT
PS: This is on os x 10.4, java version 1.5.0_07-164.


On Jul 24, 2007, at 7/243:16 PM , Robert Zeigler wrote:

> Hi all,
> Ran into a strange error recently.
> I have a table "Enrollments" with a column "grade" which maps to an  
> enum.
> I was trying to find all enrollments associated with one or more  
> particular grades. Basic query looks something like:
> SelectQuery q = new SelectQuery(Enrollment.class);
> q.setQualifier(ExpressionFactory.inExp 
> (Enrollment.GRADE_PROPERTY,Arrays.asList(Grade.FIRST,Grade.SECOND)));
> I have a setup where all of my database-facing tests run against an  
> in-memory hsql database.  The above worked just fine there.  
> However, when I ran the code via the application, which is backed  
> by a mysql server (5.0.27), it returned no results.  Everything  
> looked fine when I turned on query logging... the queries in the  
> test and in the app were identical. So I turned to the mysql query  
> logs and found this (truncated to the relevant portions for clarity):
> SELECT t0.grade,, t0.studentid FROM enrollments t0, students  
> t1 WHERE t0.studentid = t1.dbid AND (t0.grade IN ('??\0~r\0! 
> org.edkey.attendance.domain.Grade\0\0\0\0\0\0\0\0\0\0xr 
> \0java.lang.Enum\0\0\0\0\0\0\0\0\0\0xpt\0FIRST', '??\0~r\0! 
> org.edkey.attendance.domain.Grade\0\0\0\0\0\0\0\0\0\0xr 
> \0java.lang.Enum\0\0\0\0\0\0\0\0\0\0xpt\0SECOND')))
> This is using version 5.0.4 of the mysql-connector driver.
> I changed my test for this particular piece of code to connect to  
> the mysql-backed db with the same results as running "live".
> Any thoughts? Am I doing something wrong? Seems odd that it works  
> with hsqldb, but not mysql?
> Robert

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