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annotate m-toolbox/test/high_level_queries/test_high_level_query.m @ 0:f0afece42f48

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 function objs = test_high_level_query
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2
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3 % Try to get some data for a particular channel between t1 and t2
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4 %
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5 % M Hewitson
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6
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7
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8 channels = {'channelX', 'channelZ'};
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9 ts = timespan('2009-01-01 00:00:00', '2009-01-01 00:30:00');
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10
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11 hostname = 'btlab.science.unitn.it';
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12 database_name = 'ltpda_test';
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13
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14
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15 % Make db connection
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16 conn = utils.mysql.connect(hostname, database_name);
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17
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18 objs = hlq(conn, channels, ts);
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19
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20 % Close connection
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21 close(conn);
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22
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23
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24 % A prototype for the kind of high-level query functions we might need
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25 function objsOut = hlq(conn, channels, ts)
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26
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27 objsOut = [];
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28
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29 for j=1:length(channels)
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30
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31 channel = channels{j};
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32
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33 q = ['select objmeta.obj_id from objmeta,ao,tsdata ' ...
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34 'where objmeta.obj_id=ao.obj_id ' ...
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35 'and ao.data_id=tsdata.id ' ...
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36 sprintf('and objmeta.name=''%s''', channel) ...
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37 sprintf('and tsdata.t0+INTERVAL tsdata.nsecs SECOND >= ''%s''', char(ts.startT)) ...
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38 sprintf('and tsdata.t0 <= ''%s''', char(ts.endT))];
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39
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40 % execute query
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41 info = utils.mysql.dbquery(conn, q)
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42
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43 % collect objects
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44 objs = ltpda_uo.retrieve(conn, [info{:}]);
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45
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46 % join these up
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47 ojn = join([objs{:}]);
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48
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49 % split out the bit we want
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50 os = split(ojn, plist('split_type', 'interval', 'timespan', ts));
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51
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52 objsOut = [objsOut os];
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53
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54 end
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