Re: Problems with Hibernate Discriminators and 9.0-801.jdbc4

On 03/28/11 14:27, Lew wrote:
> Chris Wareham wrote:
>> Dave Cramer wrote:
>>> Ok, looking at the hibernate source this is what is in the PostgreSQLDialect
>>>
>>> public String getIdentitySelectString(String table, String column, int type) {
>>> return new StringBuffer().append("select currval('")
>>> .append(table)
>>> .append('_')
>>> .append(column)
>>> .append("_seq')")
>>> .toString();
>>> }
>>> }
>
>> Just as an aside, should that not be using a StringBuilder rather than
>> a StringBuffer? Or does Hibernate still explicitly support Java 1.4?
>
> My Red-Flag-O-Meter triggered on that, too. What Hibernate ought to do is:
>
> return "select currval('" + table + '_' + column + "_seq')";
>
> for Pete's sake.
>
> I'm off to check if EclipseLink or OpenJPA is better written.
>

I was flagging this up due to StringBuffer's locking, despite it being
used in a local scope - in other words, it doesn't need to be thread
safe, so the locking overhead can be avoided by using a StringBuilder
instead. As I suggested, perhaps Hibernate still supports Java 1.4, or
wasn't rototilled for this kind of thing when 1.4 support was dropped.
If it's still a common idiom across the Hibernate codebase then it
would be nice to see it changed.

You're right that in this case concatenation will achieve the same
thing as using an explicit StringBuilder, at least in Java 1.6[1].

Chris

[1] http://kaioa.com/node/59
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Chris Wareham
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