Kohei Nozaki created ROL-2063:
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Summary: NextLink appears in latest entry of permalink in
PostgreSQL
Key: ROL-2063
URL: https://issues.apache.org/jira/browse/ROL-2063
Project: Apache Roller
Issue Type: Bug
Components: Data Model & JPA Backend
Affects Versions: 5.1.1
Environment: PostgreSQL 9.3.4
Reporter: Kohei Nozaki
Assignee: Roller Unassigned
Priority: Minor
With PostgreSQL, NextLink shouldn't be appeared in latest entry of permalink,
but sometimes it appears as the link to latest entry itself.
The cause is precision of the column WEBLOGENTRY.PUBTIME in PostgreSQL. it is
created with the type "timestamp(2) with time zone" as specified in
postgresql.properties. the problem occurs as follows.
1. Someone posts an entry. following SQL was executed:
2015-02-23 17:07:26 JST LOG: execute <unnamed>: INSERT INTO weblogentry (id,
allowcomments, anchor, commentdays, content_src, content_type, creator, link,
locale, pinnedtomain, plugins, pubtime, righttoleft, search_description,
status, summary, text, title, updatetime, categoryid, websiteid) VALUES ($1,
$2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18,
$19, $20, $21)
2015-02-23 17:07:26 JST DETAIL: parameters: $1 =
'71837e6f-735b-4c7e-b498-6b432accdcb2', $2 = 't', $3 = 'test', $4 = '0', $5 =
NULL, $6 = NULL, $7 = 'kyle', $8 = NULL, $9 = 'en_US', $10 = 'f', $11 = '', $12
= '2015-02-23 17:07:26.548+09', $13 = 'f', $14 = '', $15 = 'PUBLISHED', $16 =
'', $17 = 'test', $18 = 'test', $19 = '2015-02-23 17:07:26.551+09', $20 =
'fb216817-f8ea-46ec-aad9-35d9f222cac4', $21 =
'78d076b8-19c2-4ee0-a766-2cdaf0b75d0d'
2. Someone visits the permalink of the entry just posted.
JPAWeblogEntryManager#getNextEntry() is invoked and following SQL was executed
and the query returns a row of current latest entry itself.
2015-02-23 17:07:34 JST LOG: execute <unnamed>: SELECT id AS a1, allowcomments
AS a2, anchor AS a3, commentdays AS a4, content_src AS a5, content_type AS a6,
creator AS a7, link AS a8, lo
cale AS a9, pinnedtomain AS a10, plugins AS a11, pubtime AS a12, righttoleft AS
a13, search_description AS a14, status AS a15, summary AS a16, text AS a17,
title AS a18, updatetime AS a19,
categoryid AS a20, websiteid AS a21 FROM weblogentry WHERE (((websiteid = $1)
AND (status = $2)) AND (pubtime > $3)) ORDER BY pubtime ASC LIMIT $4 OFFSET $5
2015-02-23 17:07:34 JST DETAIL: parameters: $1 =
'78d076b8-19c2-4ee0-a766-2cdaf0b75d0d', $2 = 'PUBLISHED', $3 = '2015-02-23
17:07:26.548+09', $4 = '1', $5 = '0'
It caused by the entry of PUBTIME is stored after rounded in the table as
follows:
roller2=# select title, pubtime FROM weblogentry WHERE (((websiteid =
'78d076b8-19c2-4ee0-a766-2cdaf0b75d0d') AND (status = 'PUBLISHED')) AND
(pubtime > '2015-02-23 17:07:26.548+09')) ORDER BY pubtime ASC LIMIT '1' OFFSET
'0';
title | pubtime
-------+---------------------------
test | 2015-02-23 17:07:26.55+09
(1 row)
Roller compared '2015-02-23 17:07:26.548+09' against '2015-02-23
17:07:26.55+09' and recognized current latest entry itself as next entry while
PUBTIME was rounded '.548' to '.55'. I don't know where Roller keeps
'2015-02-23 17:07:26.548+09' but I guess that it saved in caches in Roller or
EclipseLink because restarting of application server solves the problem
temporarily.
To solve the problem, I think changing precision of TIMESTAMP_SQL_TYPE_NULL and
TIMESTAMP_SQL_TYPE in /resources/sql/postgresql.properties from 2 to 3 is
reasonable because Roller uses milliseconds precision with java.util.Date,
larger precision is unnecessary though.
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