Question

我在查找数据类型为XMLType的表中的行时遇到问题，我正在寻找名称“ PrimeSub”和值“ Y”。谢谢

private void preparePageFormat(PageFormat pf)
{
   Paper ppr = new Paper();
   pf.setOrientation(PageFormat.LANDSCAPE);
   MediaSizeName msn = MediaSizeName.NA_LEGAL;
   MediaSize msz = MediaSize.getMediaSizeForName(msn);
   double inch = 72.0;
   width = msz.getX(MediaSize.INCH) * inch;
   height = msz.getY(MediaSize.INCH) * inch;
   ppr.setSize(a4Width, a4Height);
   ppr.setImageableArea(0, 0, a4Width, a4Height);
   pf.setPaper(ppr); 
}

main()
{
  PrinterJob job = PrinterJob.getPrinterJob();
  PageFormat pageFormat = job.defaultPage();
  preparePageFormat(pageFormat);
  job.setPrintable(previewPanel.getPrintable(), pageFormat);
  PrintRequestAttributeSet attributeSet  = new HashPrintRequestAttributeSet();
  attributeSet.add(OrientationRequested.LANDSCAPE);
  attributeSet.add(MediaSizeName.NA_LEGAL);
  if (job.printDialog(attributeSet))
  {
    attributeSet.add(new MediaPrintableArea((float)pageFormat.getImageableX(),(float)pageFormat.getImageableY(),
                        (float)pageFormat.getImageableWidth(),(float)pageFormat.getImageableHeight(),MediaPrintableArea.INCH)); 
    job.print(attributeSet);
  }
}

Answer 1

您没有发布表名或结构，因此在这里我使用mytable作为表名，使用xmlcol作为xmltype列。顶部的WITH子句仅用于提供测试数据。

with mytable as (select xmltype('<attributes>  
  <upper_lvl_ver_desc>
    <Name>AABB</Name>
    <Description>pkListValue</Description>
    <Value/>
  </upper_lvl_ver_desc>
  <upper_lvl_ver_desc>
    <Name>GL_PS_ALLOWED</Name>
    <Description>pkListValue</Description>
    <Value/>
  </upper_lvl_ver_desc>
  <upper_lvl_ver_desc>
    <Name>PrimeSub</Name>
    <Description>pkListValue</Description>
    <Value>Y</Value>
  </upper_lvl_ver_desc>
</attributes>') as xmlcol from dual)
-- query starts here
select xmlcol
from mytable
inner join XMLTable('/attributes/upper_lvl_ver_desc' PASSING mytable.xmlcol
                COLUMNS c_name varchar2(50) PATH 'Name',
                        c_value varchar2(1) PATH 'Value') atts
on c_name = 'PrimeSub' and c_value = 'Y'
;

该方法似乎有点违反直觉，但这是Oracle建议这样做的一种方法。使用XMLTable函数将XML列作为伪表加入，将其转换为可以在SQL中轻松操作的关系数据。 You can read more about it here。

列中的XML数据类型以查找值的存在

1 个答案: