<tfoot id='GM2Xa'></tfoot>
    • <bdo id='GM2Xa'></bdo><ul id='GM2Xa'></ul>

    <small id='GM2Xa'></small><noframes id='GM2Xa'>

      1. <i id='GM2Xa'><tr id='GM2Xa'><dt id='GM2Xa'><q id='GM2Xa'><span id='GM2Xa'><b id='GM2Xa'><form id='GM2Xa'><ins id='GM2Xa'></ins><ul id='GM2Xa'></ul><sub id='GM2Xa'></sub></form><legend id='GM2Xa'></legend><bdo id='GM2Xa'><pre id='GM2Xa'><center id='GM2Xa'></center></pre></bdo></b><th id='GM2Xa'></th></span></q></dt></tr></i><div id='GM2Xa'><tfoot id='GM2Xa'></tfoot><dl id='GM2Xa'><fieldset id='GM2Xa'></fieldset></dl></div>
        <legend id='GM2Xa'><style id='GM2Xa'><dir id='GM2Xa'><q id='GM2Xa'></q></dir></style></legend>

      2. Lucene不是空查询?

        Lucene not null query?(Lucene不是空查询?)

          • <small id='mJjgz'></small><noframes id='mJjgz'>

            <tfoot id='mJjgz'></tfoot>
            • <bdo id='mJjgz'></bdo><ul id='mJjgz'></ul>
              <i id='mJjgz'><tr id='mJjgz'><dt id='mJjgz'><q id='mJjgz'><span id='mJjgz'><b id='mJjgz'><form id='mJjgz'><ins id='mJjgz'></ins><ul id='mJjgz'></ul><sub id='mJjgz'></sub></form><legend id='mJjgz'></legend><bdo id='mJjgz'><pre id='mJjgz'><center id='mJjgz'></center></pre></bdo></b><th id='mJjgz'></th></span></q></dt></tr></i><div id='mJjgz'><tfoot id='mJjgz'></tfoot><dl id='mJjgz'><fieldset id='mJjgz'></fieldset></dl></div>
              <legend id='mJjgz'><style id='mJjgz'><dir id='mJjgz'><q id='mJjgz'></q></dir></style></legend>

                  <tbody id='mJjgz'></tbody>
                  本文介绍了Lucene不是空查询?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我们如何构造一个查询来搜索不为空的特定字段?

                  How can we construct a query to search for particular field to be not null?

                  field_name:* 不起作用.我试过 field_name:[a* to z*] 这适用于英语,但不涵盖所有语言.

                  field_name:* is not working. I tried field_name:[a* to z*] this works fine for English, but does not cover all languages.

                  还有其他建议吗?

                  推荐答案

                  目前 Lucene 不支持.请参阅 this 进行讨论.

                  This is currently not supported by Lucene. See this for a discussion.

                  另一种选择可能是将一些预定义的字符串(如 nullnullnullnull)存储为字段值(如果它为空).然后您可以使用否定过滤器来删除这些记录.(我不太喜欢这个,但想不出更好的选择)

                  An alternative option may be to store some pre-defined string (like nullnullnullnull) as the field value if it is null. Then you can use a negative filter to remove these records. (I don't like this much, but can't think of a better option)

                  这篇关于Lucene不是空查询?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

                  本站部分内容来源互联网,如果有图片或者内容侵犯了您的权益,请联系我们,我们会在确认后第一时间进行删除!

                  相关文档推荐

                  How to send data to COM PORT using JAVA?(如何使用 JAVA 向 COM PORT 发送数据?)
                  How to make a report page direction to change to quot;rtlquot;?(如何使报表页面方向更改为“rtl?)
                  Use cyrillic .properties file in eclipse project(在 Eclipse 项目中使用西里尔文 .properties 文件)
                  Is there any way to detect an RTL language in Java?(有没有办法在 Java 中检测 RTL 语言?)
                  How to load resource bundle messages from DB in Java?(如何在 Java 中从 DB 加载资源包消息?)
                  How do I change the default locale settings in Java to make them consistent?(如何更改 Java 中的默认语言环境设置以使其保持一致?)

                      <small id='RZhdP'></small><noframes id='RZhdP'>

                      <i id='RZhdP'><tr id='RZhdP'><dt id='RZhdP'><q id='RZhdP'><span id='RZhdP'><b id='RZhdP'><form id='RZhdP'><ins id='RZhdP'></ins><ul id='RZhdP'></ul><sub id='RZhdP'></sub></form><legend id='RZhdP'></legend><bdo id='RZhdP'><pre id='RZhdP'><center id='RZhdP'></center></pre></bdo></b><th id='RZhdP'></th></span></q></dt></tr></i><div id='RZhdP'><tfoot id='RZhdP'></tfoot><dl id='RZhdP'><fieldset id='RZhdP'></fieldset></dl></div>
                        <tbody id='RZhdP'></tbody>
                        1. <tfoot id='RZhdP'></tfoot>

                          • <bdo id='RZhdP'></bdo><ul id='RZhdP'></ul>

                            <legend id='RZhdP'><style id='RZhdP'><dir id='RZhdP'><q id='RZhdP'></q></dir></style></legend>