在 SQL 中查询 XML 以返回 NULL 和空数据集的节点结果列表？

Question

我有一个包含一个 XML 列的 SQL 表，我想查询 XML 并获取 id/@extension 以及所有观察/代码的列表。但是它总是返回空结果。我已经隔离了一个包含代表性测试数据的示例表，请参见下文

CREATE TABLE study123 (
    ID integer,
    Title varchar(25),
    STXML XML
);

INSERT INTO study123 (
    ID,
    Title,
    STXML
) VALUES
(1, 'ST_Cardio', '<MeasurementDocument xmlns="urn:hl7-org:v3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <id extension="68c65a01-2188-486c-adde-a854453ff817" />
  <code code="ST_Cardio" displayName="CardioLife60+" />
  <title>CardioLife 60+</title>
  <text>Prospective validation of CardioLife algorithms age 60+</text>
  <component>
    <section>
      <entry typeCode="DRIV">
        <observation classCode="OBS" moodCode="CRT">
          <code code="TMPL_1120000364" displayName="CV TEE/CARDIO DAILYLOG" />
        </observation>
      </entry>
      <entry typeCode="DRIV">
        <observation classCode="OBS" moodCode="CRT">
          <code code="TMPL_1120000365" displayName="CV TEE/CARDIO VITAL SIGNS CHECKLIST" />
        </observation>
      </entry>
    </section>
  </component>
</MeasurementDocument>'),
(2, 'ST_Diabetics', '<MeasurementDocument xmlns="urn:hl7-org:v3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <id extension="a3be767f-1315-4e2b-ab4e-11a238d7f9a1" />
  <code code="ST_Diabetics" displayName="DiabeticsObs" />
  <title>Diabetics Observation 2023-2024</title>
  <text>Diabetics Observation 2023-2024 Extended II</text>
  <component>
    <section>
      <entry typeCode="DRIV">
        <observation classCode="OBS" moodCode="CRT">
          <code code="TMPL_1173900045" displayName="CVR PHYSIC DIABETICS" />
        </observation>
      </entry>
      <entry typeCode="DRIV">
        <observation classCode="OBS" moodCode="CRT">
          <code code="TMPL_1177400741" displayName="CVR DIABETICS OBSERVATIONWEEK" />
        </observation>
      </entry>
      <entry typeCode="DRIV">
        <observation classCode="OBS" moodCode="CRT">
          <code code="TMPL_1189600034" displayName="CVR DIABETICS REVALIDATION CHECKLIST" />
        </observation>
      </entry>
    </section>
  </component>
</MeasurementDocu

ment>

Answer 1

请所有波纹管代码。将会解决您的问题。

app.use((req, res, next) => {
const allowedOrigins = ['http://localhost:8000'];
const origin = req.headers.origin;

if (allowedOrigins.includes(origin)) {
    res.setHeader('Access-Control-Allow-Origin', origin);
}

res.header('Access-Control-Allow-Methods', 'GET, OPTIONS');
res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
res.header('Access-Control-Allow-Credentials', true);
return next();

});