Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>A dynamic language rules for this. Why? The mappings are easy to code and change. You don't have to recompile and rebuild.</p> <p>Indeed, with a little cleverness, you can have your "XML XPATH to a Tag -> DB table-field" mappings as disjoint blocks of Python code that your main application imports.</p> <p>The block of Python code <strong>is</strong> your configuration file. It's not an <code>.ini</code> file or a <code>.properties</code> file that describes a configuration. It <strong>is</strong> the configuration.</p> <p>We use Python, xml.etree and the SQLAlchemy (to separate the SQL out of your programs) for this because we're up and running with very little effort and a great deal of flexibility.</p> <hr> <p><strong>source.py</strong></p> <pre><code>"""A particular XML parser. Formats change, so sometimes this changes, too.""" import xml.etree.ElementTree as xml class SSXML_Source( object ): ns0= "urn:schemas-microsoft-com:office:spreadsheet" ns1= "urn:schemas-microsoft-com:office:excel" def __init__( self, aFileName, *sheets ): """Initialize a XML source. XXX - Create better sheet filtering here, in the constructor. @param aFileName: the file name. """ super( SSXML_Source, self ).__init__( aFileName ) self.log= logging.getLogger( "source.PCIX_XLS" ) self.dom= etree.parse( aFileName ).getroot() def sheets( self ): for wb in self.dom.getiterator("{%s}Workbook" % ( self.ns0, ) ): for ws in wb.getiterator( "{%s}Worksheet" % ( self.ns0, ) ): yield ws def rows( self ): for s in self.sheets(): print s.attrib["{%s}Name" % ( self.ns0, ) ] for t in s.getiterator( "{%s}Table" % ( self.ns0, ) ): for r in t.getiterator( "{%s}Row" % ( self.ns0, ) ): # The XML may not be really useful. # In some cases, you may have to convert to something useful yield r </code></pre> <p><strong>model.py</strong></p> <pre><code>"""This is your target object. It's part of the problem domain; it rarely changes. """ class MyTargetObject( object ): def __init__( self ): self.someAttr= "" self.anotherAttr= "" self.this= 0 self.that= 3.14159 def aMethod( self ): """etc.""" pass </code></pre> <p><strong>builder_today.py</strong> One of many mapping configurations</p> <pre><code>"""One of many builders. This changes all the time to fit specific needs and situations. The goal is to keep this short and to-the-point so that it has the mapping and nothing but the mapping. """ import model class MyTargetBuilder( object ): def makeFromXML( self, element ): result= model.MyTargetObject() result.someAttr= element.findtext( "Some" ) result.anotherAttr= element.findtext( "Another" ) result.this= int( element.findtext( "This" ) ) result.that= float( element.findtext( "that" ) ) return result </code></pre> <p><strong>loader.py</strong></p> <pre><code>"""An application that maps from XML to the domain object using a configurable "builder". """ import model import source import builder_1 import builder_2 import builder_today # Configure this: pick a builder is appropriate for the data: b= builder_today.MyTargetBuilder() s= source.SSXML_Source( sys.argv[1] ) for r in s.rows(): data= b.makeFromXML( r ) # ... persist data with a DB save or file write </code></pre> <hr> <p>To make changes, you can correct a builder or create a new builder. You adjust the loader source to identify which builder will be used. You can, without too much trouble, make the selection of builder a command-line parameter. Dynamic imports in dynamic languages seem like overkill to me, but they are handy.</p>
    singulars
    1. This table or related slice is empty.
    1. POWhich language is easiest and fastest to work with XML content?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USS.Lott
    1. USS.Lott
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhich language is easiest and fastest to work with XML content?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COExlpain a bit in detail, please
      singulars
      1. PO
      1. USVarun Mahajan
    2. COI'd also like to throw in a shout out for lxml, which provides pythonic bindings for libxml2. In addition to building etrees, it provides more complete xpath support that elementtree alone.
      singulars
      1. PO
      1. USAaron Maenpaa
    3. CO+ 1. I tried XML processing in C#, PHP, Java and Python and the last wins. It's just easier and clearer. And there are already tools to do most of the mapping automatically.
      singulars
      1. PO
      1. USe-satis
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload