Question

升级到spring数据mongodb 1.10.1后，运行查询时遇到错误：

@Query("{$and :["
            + "{ $or : [ { $where: '?0 == null' } , { 'field1' : ?0 } ] },"
            + "{ $or : [ { $where: '?1 == null' } , { 'field2' : ?1 } ] },"
            + "]}")
public Page<Entity> findAll(String param1, String param2)

检查错误我看到where子句中的参数没有引用，结果我得到：

org.springframework.data.mongodb.UncategorizedMongoDbException：查询失败，错误代码139和错误消息'ReferenceError： test_param_value未定义：

我在这里看到了一些答案，建议这种处理可选参数的方式（（spring-data-mongo - optional query parameters?））但它不再起作用，我似乎无法在发布更改日志中找到任何内容。

Answer 1

In case anyone else is interested, I managed to find a workaround after checking a similar ticket int the Spring Data project.

It seems the way I was checking for null parameters in the query is not a good practice. This is from a Spring developer comment: "placeholders are not designed to compose keys/values but bind parameters. Beyond that, placeholder use in quoted strings is always problematic in terms of escaping. Using SpEL should suit your needs"

So I ended up using SpEL to do the checks on parameters and it works fine. This is how it looks:

@Query("{$and :[" 
        + "?#{ [0] == null ? { $where : 'true'} : { 'field1' : [0] } },"
        + "?#{ [1] == null ? { $where : 'true'} : { 'field2' : [1] } },"
        + "]}")
public Page<Entity> findAll(String param1, String param2, Pageable pageable);

Spring数据mongodb：可选的@Query参数不再有效

1 个答案: