Mercurial > hg > ltpda

annotate m-toolbox/classes/+utils/@jmysql/getXdoc.m @ 3:960fe1aa1c10 database-connection-manager

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Add LTPDADatabaseConnectionManager implementation. Java code
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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1 % GETXDOC retrieves an object with given id from the LTPDA
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2 % repository specified by the input database connection. The object is
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3 % converted from its XML text format to an Xdoc. This can then be converted
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4 % into an object using the appropriate object constructor.
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5 %
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6 % Usage: xdoc = getXdoc(conn, id)
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7 %
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8 % Inputs:
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9 % conn - a database connection object
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10 % id - the object id
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11 %
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12 % Outputs:
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13 % xdoc - an Xdoc representation of the object.
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14 %
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15 % M Hewitson 30-08-07
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16 %
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17 % $Id: getXdoc.m,v 1.2 2009/06/17 11:05:53 ingo Exp $
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18 %
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19 %
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20
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21 function xdoc = getXdoc(conn, id)
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22
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23 xdoc = '';
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24
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25 try
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26 results = conn.query(sprintf('select xml from objs where id="%d"', id));
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27 while results.next
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28 objTxt = char(results.getString(1));
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29 end
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30 catch curs
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31 error('### Unable to read xml for ID %d. Server returned %s', id, curs.message);
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32 end
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33
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34 if ~isempty(objTxt) && ~strcmp(objTxt(:), 'No Data')
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35 % convert to Java string
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36 str = java.lang.String(objTxt);
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37 % open stream on this string
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38 stream = java.io.StringBufferInputStream(str);
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39 % make parser
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40 builder = javax.xml.parsers.DocumentBuilderFactory.newInstance.newDocumentBuilder;
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41
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42 xdoc = builder.parse(stream);
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43 else
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44 xdoc = [];
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45 end
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46
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47 end
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