src/main/java/org/polyjdbc/core/query/SimpleQueryRunner.java
public <T> T queryUnique(final SelectQuery query, final ObjectMapper<T> mapper) {
        return runner.run(new TransactionWrapper<T>() {
            public T perform(QueryRunner queryRunner) {
                return queryRunner.queryUnique(query, mapper);
            }
        });
    }
public <T> T queryUnique(final SelectQuery query, final ObjectMapper<T> mapper) {
        return runner.run(new TransactionWrapper<T>() {
            public T perform(QueryRunner queryRunner) {
                return queryRunner.queryUnique(query, mapper);
            }
        });
    }
Find unique entry, uses {@link QueryRunner#queryUnique(org.polyjdbc.core.query.SelectQuery, org.polyjdbc.core.query.mapper.ObjectMapper) }.