Question

给出以下XML结构：

<clinical_study>
  <primary_outcome>
    <measure></measure>
    <time_frame></time_frame>
    <safety_issue></safety_issue>
    <description></description>
  </primary_outcome>
  <secondary_outcome>
    <measure></measure>
    <time_frame></time_frame>
    <safety_issue></safety_issue>
    <description></description>
  </secondary_outcome>
</clinical_study>

我想解析这些属性标记中的值，并将它们转储到名为“CLINICAL_STUDY”的Oracle表中，并使用以下列结构：

desc clinical_study
Name                         Null     Type              
---------------------------- -------- -----------------    
PRIMARY_OUTCOME_MEASURE               VARCHAR2(50)      
PRIMARY_OUTCOME_TIME_FRAME            VARCHAR2(50)      
PRIMARY_OUTCOME_SAFETY_ISSUE          VARCHAR2(50)      
PRIMARY_OUTCOME_DESCRIPTION           VARCHAR2(4000)    
SECONDARY_OUTCOME_MEASURE               VARCHAR2(50)      
SECONDARY_OUTCOME_TIME_FRAME            VARCHAR2(50)      
SECONDARY_OUTCOME_SAFETY_ISSUE          VARCHAR2(50)      
SECONDARY_OUTCOME_DESCRIPTION           VARCHAR2(4000)

我意识到有几种方法可以实现这一点，但我不太确定哪种方法最简单。我倾向于XSLT，它会“压平”数据，然后很容易转换成表结构，但好奇的是，如果有一个更简单的方法。提前谢谢。

Answer 1

如果使用Java进行编程，则不需要运行XSLT转换。您应该能够从XML文件中读取数据并将其写入数据库。

当然有多种方法可以做到，但一种方法是使用JAXB读入数据。（如果你有足够小的数据可以在处理时将它保存在内存中，这基本上可以工作。如果你有大量的数据，你可能想要使用像StAX这样的流式XML解析器API。）

首先，您可以创建一对类来表示您的输入数据，并使用JAXB注释进行注释，这些注释定义了XML的映射。

@XmlAccessorType(XmlAccessType.FIELD)
public class Outcome {

    @XmlElement(name="measure")
    private String measure;

    @XmlElement(name="time_frame")
    private String timeFrame;

    @XmlElement(name="safety_issue")
    private String safetyIssue;

    @XmlElement(name="description")
    private String description;

    // getters and setters omitted for brevity
}

和

inputStream

然后你可以从XML中读取或解析你的数据（假设JAXBContext context = JAXBContext.newInstance(ClinicalStudy.class); Unmarshaller unmarshaller = context.createUnmarshaller(); ClinicalStudy clinicalStudy = (ClinicalStudy) unmarshaller.unmarshal(inputStream);是XML内容的流）。

conn

并插入数据库（假设PreparedStatement pstmt = conn.prepareStatement( "INSERT INTO clinical_study (" + "PRIMARY_OUTCOME_MEASURE, " + "PRIMARY_OUTCOME_TIME_FRAME, " + "PRIMARY_OUTCOME_SAFETY_ISSUE, " + "PRIMARY_OUTCOME_DESCRIPTION, " + "SECONDARY_OUTCOME_MEASURE, " + "SECONDARY_OUTCOME_TIME_FRAME, " + "SECONDARY_OUTCOME_SAFETY_ISSUE, " + "SECONDARY_OUTCOME_DESCRIPTION) " + "VALUES (?, ?, ?, ?, ?, ?, ?, ?)"); pstmt.setString(1, clinicalStudy.getPrimaryOutcome().getMeasure()); pstmt.setString(2, clinicalStudy.getPrimaryOutcome().getTimeFrame()); pstmt.setString(3, clinicalStudy.getPrimaryOutcome().getSafetyIssue()); pstmt.setString(4, clinicalStudy.getPrimaryOutcome().getDescription()); pstmt.setString(5, clinicalStudy.getSecondaryOutcome().getMeasure()); pstmt.setString(6, clinicalStudy.getSecondaryOutcome().getTimeFrame()); pstmt.setString(7, clinicalStudy.getSecondaryOutcome().getSafetyIssue()); pstmt.setString(8, clinicalStudy.getSecondaryOutcome().getDescription()); pstmt.execute();是JDBC数据库连接）。

  def exprNeg[T:Numeric](value: T): T = {
    val n = implicitly[Numeric[T]]
    n.negate(value)
  }

如何使用JAVA将给定的分层XML文件转换为非规范化的关系数据库表

1 个答案: