Thread: SQL select doesn't work

Hello!

I use xwiki with postgresql, xwiki uses hibernate. I have exception on
select, that successful executed in psql:

select distinct xwikidocum0_.XWD_WEB as col_0_0_,
xwikidocum0_.XWD_NAME as col_1_0_, xwikidocum0_.XWD_DATE as col_2_0_
from xwikidoc xwikidocum0_ where (xwikidocum0_.XWD_HIDDEN<>true or
xwikidocum0_.XWD_HIDDEN is null) and 1=1 and
xwikidocum0_.XWD_AUTHOR='XWiki.leonidv' order by xwikidocum0_.XWD_DATE
desc

Exception:
org.postgresql.util.PSQLException: ERROR: could not find hash function
for hash operator 2060
        at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:
2102)
        at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:
1835)
        at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:
257)
        at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:
500)
        at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:
388)
        at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:
273)
        at
org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:
96)
        at
org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:
96)
        at
org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:
96)
        at
org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:
186)

Given that this is an error from the backend (see receiveErrorResponse
in the stack trace), my guess is you're not running quite the same
query in psql.

So,

1. What is the definition of the xwikidoc table?
2. How did you figure out what SQL Hibernate is using here? How are
you executing it in psql? I imagine the main difference here could be
if Hibernate is using a prepared statement and you're just
substituting parameters directly into the psql query instead of using
PREPARE/EXECUTE (which still might not be *quite* the same thing, but
it's probably closer).

---
Maciek Sakrejda | System Architect | Truviso

1065 E. Hillsdale Blvd., Suite 215
Foster City, CA 94404
www.truviso.com