java - 构建查询时出错，显示 "previous operations still waiting for clauses"

Question

我尝试查询 3 种类型的产品，但收到此错误:

The SQL statement has not been finished since there are previous operations 
    still waiting for clauses.

这是代码:

QueryBuilder<Product, UUID> queryBuilder = pDao.queryBuilder();
Where<Transaction, UUID> where = queryBuilder.where();
where.eq("state", Product.State.NEW)
          .and()
          .eq("type", Product.Type.DIGITAL)
          .or()                               -> I get the error here
          .eq("type", Product.Type.PHYSICAL);

Answer 1

The SQL statement has not been finished since there are previous operations still waiting for clauses

嗯。我无法重现这一点，并且 QueryBuilder 内容的测试覆盖率非常好。我添加了 similar test here通过了。

QueryBuilder<Foo, String> qb = dao.queryBuilder();
Where<Foo, String> where = qb.where();
where.eq(Foo.VAL_COLUMN_NAME, foo1.val)
        .and()
        .eq(Foo.STRING_COLUMN_NAME, foo1.stringField)
        .or()
        .eq(Foo.STRING_COLUMN_NAME, foo2.stringField);

我认为还有其他事情正在发生。也许正在进行额外的 Where 调用，但这些调用未在您的测试中体现？如果没有，请确保您运行的是 4.48 或 5.0 版本。

您还可以尝试使用带参数的 and(...) 和 or(...) 生成查询:

 where.and(where.eq("state", Product.State.NEW),
           where.or(where.eq("type", Product.Type.DIGITAL),
                    where.eq("type", Product.Type.PHYSICAL)));

请参阅docs on QueryBuilder了解更多。