java JIT -- what optimizations are possible?

Question

Academically curious. Can the JIT take code like this, recognize that the format string is static final and thus precompute the sliced format string, thus optimizing this down to only StringBuilder with minimal appends?

public static String buildDeleteSql(BaseObject object)
{
    String table;
    String schema;

    String deleteSql = String.format(
            "DELETE FROM %s.%s WHERE %s = '%s' AND %s = '%s'",
            schema,
            table,
            BaseObject.ATTR_ID,
            StringUtils.escapeForSQLString(object.getId()),
            BaseObject.ATTR_REVISION,
            StringUtils.escapeForSQLString(object.getRevision())
        );

    return deleteSql;
}

The hypothetical JIT that I am thinking of can. Is there a particular JVM you are considering? — Andy
– Andy, Commented Feb 7, 2011 at 15:00
This code screams to be refactored with a PreparedStatement :) — Geoffrey De Smet
– Geoffrey De Smet, Commented Feb 8, 2011 at 9:59

gustafc · Accepted Answer · 2011-02-07 15:17:30Z

5

Theoretically, a JVM could probably grok your example. Meantime, in reality, existing JVMs won't; it's probably not a very lucrative place to spend the budget for optimizations. Especially since string formatting is usually done to serialize data, in which case you'll probably end up spending most of the time waiting for I/O to complete.

answered Feb 7, 2011 at 15:17

gustafc

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