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annotate m-toolbox/classes/+utils/@mysql/execute.m @ 33:5e7477b94d94 database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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2b57573b11c7 Add utils.mysql.execute
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1 function varargout = execute(conn, query, varargin)
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2 % EXECUTE Execute the given QUERY with optional parameters VARARGIN
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3 % substituted for the '?' placeholders through connection CONN. In the
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4 % case of data manupulation queries returns the update count. In case
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5 % of data retrival queries returns a 2D cell array with the query
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6 % results and optionally a cell array with column names.
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7 %
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8 % CALL:
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9 %
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10 % [rows] = utils.mysql.execute(conn, query, varargin)
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11 % [rows, names] = utils.mysql.execute(conn, query, varargin)
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12 %
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13 % PARAMETERS:
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14 %
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15 % conn - an object implementing the java.sql.Connection interface
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16 % query - SQL query string. ? are substituted with PARAMS values
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17 % varargin - query parameters
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18 %
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19 % RETURNS:
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20 %
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21 % rows - update count in the case of data manipulation queries
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22 % or 2D cell array with query resutls in the case of
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23 % data retrival queries
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24 % names - names of the columns in the result set
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25 %
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26
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27 % check parameters
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28 if nargin < 2
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29 error('### incorrect usage');
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30 end
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31 if ~isa(conn, 'java.sql.Connection')
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32 error('### invalid connection');
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33 end
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34
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35 % build query
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36 stmt = conn.prepareStatement(query);
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37 for kk = 1:numel(varargin)
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38 stmt.setObject(kk, matlab2sql(varargin{kk}));
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39 end
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40
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41 % execute query
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42 rv = stmt.execute();
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43
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44 switch rv
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45 case 0
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46 % we have an update count
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47 varargout{1} = stmt.getUpdateCount();
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48 case 1
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49 % we have a result set
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50 rs = stmt.getResultSet();
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51
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52 % get results into a cell array
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53 md = rs.getMetaData();
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54 nc = md.getColumnCount();
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55 row = 1;
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56 rows = {};
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57 while rs.next()
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58 for kk = 1:nc
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59 % convert to matlab objects
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60 rows{row, kk} = java2matlab(rs.getObject(kk));
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61 end
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62 row = row + 1;
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63 end
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64
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65 % get column names
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66 names = cell(1, nc);
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67 for kk = 1:nc
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68 names{kk} = char(md.getColumnName(kk));
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69 end
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70
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71 % assign output
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72 switch nargout
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73 case 0
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74 varargout{1} = rows;
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75 case 1
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76 varargout{1} = rows;
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77 case 2
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78 varargout{1} = names;
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79 varargout{2} = rows;
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80 otherwise
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81 error('### too many output arguments');
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82 end
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83
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84 otherwise
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85 erorr('### error');
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86 end
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87 end
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88
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89
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90 function val = matlab2sql(val)
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91 switch class(val)
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92 case 'char'
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93 % matlab converts length one strings to the wrong java type
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94 val = java.lang.String(val);
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95 case 'time'
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96 % convert time objects to strings
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97 val = val.format('yyyy-mm-dd HH:MM:SS', 'UTC');
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98 end
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99 end
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100
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101
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102 function val = java2matlab(val)
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103 % matlab converts all base types. just add a conversion for datetime columns
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104 switch class(val)
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105 case 'java.sql.Timestamp'
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106 val = time(plist('time', char(val), 'timezone', 'UTC'));
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107 end
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108 end