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From "Ryosuke Iwata (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-426) Incorrect DEFERRABLE usage with PostgreSQL
Date Thu, 01 Nov 2007 13:35:50 GMT
Incorrect DEFERRABLE usage with PostgreSQL
------------------------------------------

                 Key: OPENJPA-426
                 URL: https://issues.apache.org/jira/browse/OPENJPA-426
             Project: OpenJPA
          Issue Type: Bug
          Components: sql
    Affects Versions: 1.0.0, 1.1.0
         Environment: PostgreSQL database 8.1.
            Reporter: Ryosuke Iwata


OpenJPA generates incorrect CREATE TABLE statements with PostgreSQL, and you will get syntax
errors.

OpenJPA adds "DEFERRABLE" to unique constraints, probably because PostgresDictionary sets
"true" as "supportsDeferredConstraints", while PostgreSQL accepts "DEFERRABLE" only with foreign
key constraints.

The description of "CREATE TABLE" in the PostgreSQL documents is so confusing : the syntax
description at the top of the page makes us feel that "DEFERRABLE" can be specified with any
table constraints, but you can find that it says "Only foreign key constraints currently accept
this clause" in the middle of the page. See:
	http://www.postgresql.org/docs/8.1/interactive/sql-createtable.html

As a result of this confusion, SQL statements which OpenJPA generates result in database errors
saying :
	syntax error at or near "DEFERRABLE"

An example of generated SQLs is :
	CREATE TABLE PUBLIC.FOO (entityId BIGINT NOT NULL,
	memo TEXT, name VARCHAR(255) NOT NULL,
	entityVersion INTEGER NOT NULL,
	PRIMARY KEY (entityId), UNIQUE (name) DEFERRABLE);


As a workaround, you can add the following line in the persistence.xml to avoid this problem:
	<property name="openjpa.jdbc.DBDictionary" value="postgres(SupportsDeferredConstraints=false)"/>


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