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annotate m-toolbox/classes/+utils/@jmysql/query.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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children 91f21a0aab35
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % QUERY query an LTPDA repository.
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: QUERY query an LTPDA repository.
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5 %
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6 % CALL: results = query(conn, q)
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7 % [results, col_names] = query(conn, q)
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8 %
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9 % INPUTS:
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10 % conn - an mpipeline.repository.RepositoryConnection object,
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11 % as is returned by utils.jmysql.connect
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12 % q - a valid MySQL query string
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13 %
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14 % OUTPUTS:
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15 % results - a cell-array of the results
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16 % col_names - a cell-array of the column names in the query
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17 %
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18 % VERSION: $Id: query.m,v 1.1 2009/07/27 19:46:21 hewitson Exp $
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19 %
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20 % HISTORY: 24-05-2007 M Hewitson
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21 % Creation
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22 %
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23 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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24
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25
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26 % (*) the expiry time for MySQL logins is a property of the
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27 % LTPDA Toolbox and can be set in the LTPDA Preferences.
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28
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29
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30 function varargout = query(varargin)
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31
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32 prefs = getappdata(0, 'LTPDApreferences');
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33
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34 if ~isa(varargin{1}, 'mpipeline.repository.RepositoryConnection')
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35 error('### The first argument should be a RepositoryConnection');
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36 end
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37
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38 if ~ischar(varargin{2})
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39 error('### The second argument should be a query string.');
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40 end
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41
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42 % Inputs
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43 conn = varargin{1};
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44 q = varargin{2};
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45
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46 % Outputs
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47 results = {};
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48 colnames = {};
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49
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50 % Check connection
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51 if ~conn.isConnected
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52 conn.openConnection
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53 end
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54
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55 if ~conn.isConnected
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56 conn.display;
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57 error('### Failed to open connection');
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58 return
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59 end
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60
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61 resultSet = conn.query(q);
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62
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63 % Set outputs
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64 if nargout > 0
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65 varargout{1} = resultSet;
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66 if nargout == 2
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67 % Get column names from the meta data
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68 rsm = resultSet.getMetaData;
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69 Nc = rsm.getColumnCount;
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70 colnames = cell(1,Nc);
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71 for kk=1:Nc
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72 colnames{kk} = char(rsm.getColumnName(kk));
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73 end
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74 varargout{2} = colnames;
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75 end
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76 end
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77
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78 end
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