Xml to DB handler - grails tutorial
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This document describes how to populate a database by reading values from an XML file using Grails. It involves: 1. Creating domain classes to represent filters and values from the XML 2. Defining an XML_Handler class with a run method that parses the XML file and inserts the data 3. The run method loops through each filter, saves it, then loops through its values to save them while associating the value with its filter 4. Calling XML_Handler.run() from a controller will execute the code to populate the database from the XML file.
Xml to DB handler - grails tutorial
- 1. Dalton Valadares – Universidade Federal de Campina Grande How to populate a DB reading values from a XML file, with GRAILS? -Suppose your XML is the following: <Result totalLooseOffers="0" xsi:schemaLocation="http://somewhere.onthe.net/something.xsd"> <details> <applicationID>37394759ds2k9a2k467626f3d</applicationID> <date>2013-04-11T14:31:11.490-03:00</date> <elapsedTime>1</elapsedTime> <status>success</status> <code>0</code> <message>success</message> </details> <category concatenateCategoryName="false" hasOffer="false" isFinal="true" parentCategoryId="116" id="3661"> <thumbnail url="http://somewhere.onthe.net/something.jpg"/> <links> <link type="category" url="http://somewhere.onthe.net/something/51922611"/> <link type="xml" url="http://somewhere.onthe.net/something/3739416878456f4/br/> </links> <name>Air conditioning </name> <filters> <filter name="Brand" id="1246"> <value value="Springer Carrier" id="47204"/> <value value="LG" id="7018"/> <value value="Consul" id="7017"/> <value value="Midea" id="106986"/> </filter> <filter name="Type" id="1246"> <value value="Split" id="404"/> <value value="Window" id="18"/> <value value="Portable" id="707"/> <value value="Multi-split" id="1066"/> </filter> . . . </category> -You want to save filters and values into DB; -With your domain and controller classes created, you will have the save() method implemented; -Create the class XML_Handler: import java.awt.GraphicsConfiguration.DefaultBufferCapabilities; import entities.Filter; //Your domain class for Filters import entities.Value; //Your domain class for Values import groovy.util.XmlParser class XML_Handler { public static run() { def air_conditioning = new File("/path_to_file/air_conditioning.xml") this.insertIntoDB(air_conditioning) } static insertIntoDB(File file) { def my_handler = new XmlParser().parse(file)
- 2. my_handler.category.filters.filter.each { Filter filter = new Filter(); filter.description = it.@name filter.save(flush: true) println "Filter: " + it.@name + " -----OK!" it.value.each { //the attribute filter receives the filter inserted before (created above)... Value value = new Value(description: it.@value, filter: filter); value.save(flush: true) println " Value - " + it.@value + " -----OK!" } } } -Now, you just need to put the line below to be executed in any part of any controller (you can put a button to do this function): XML_Handler.run(); //when the code is executed, the values are inserted into DB I hope it can help...