Re: WO and MySQL --> PostgresqlPlugIn: Project Wonder
Re: WO and MySQL --> PostgresqlPlugIn: Project Wonder
- Subject: Re: WO and MySQL --> PostgresqlPlugIn: Project Wonder
- From: LD <email@hidden>
- Date: Tue, 18 Oct 2005 05:14:22 +1000
Hi there,
On 18/10/2005, at 1:54 AM, Arturo Perez wrote:
LD wrote:
[1] The postgres serial type automatically creates a sequenced
called: <tableName>_<pkColumn>_SEQ whereas the current version
of the plugin looks for a sequence called <tableName>_SEQ.
You might having trouble that the user that is connecting to the
database does not have permission to generate new tables. The
wonder plugin used to generate a EO_PK_TABLE.
You can view the source online here:
http://cvs.sourceforge.net/viewcvs.py/wonder/Wonder/PlugIns/
PostgresqlPlugIn/Sources/com/webobjects/jdbcadaptor/
PostgresqlPlugIn.java has
protected static String sequenceNameForEntity(EOEntity entity) {
return entity.primaryKeyRootName() + "_SEQ";
}
i.e., <tableName>_SEQ
Customise it as required. I suggest something like the following
if you want it to be automatically compatible with using the
"serial" column type sequences as created by postgres.
protected static String sequenceNameForEntity( EOEntity entiy ) {
StringBuffer sequenceName;
sequenceName = new StringBuffer();
sequenceName.append( entity.primaryKeyRootName() ); // i.e.,
the table name
sequenceName.append( entity.primaryKeyAttributeNames
().valueForKey( "columnName" ).componentsJoinedByString( "_" ) );
sequenceName.append( "_SEQ" );
return sequenceName.toString();
}
i.e., <tableName>_<primaryKey0>_<primaryKeyN>_SEQ. In most cases
where there's a single primary key: <tableName>_<primaryKey0>_SEQ
That's pretty nice. I would suggest modifying it to detect if the
column type is SERIAL and then you'll have the best of both worlds.
Well, the above is a snippet really of what I was working on a month
or so ago (but haven't had time to complete. i.e., test) where I do
indeed test for various sequence names the first time around; upon
discovery we save it in the user info for the entity to save round-
trips the next time.
I'll have to get back onto that...
with regards,
--
LD
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