1 | /**********************************************************************
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2 | *
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3 | * sqldbclass.cpp --
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4 | * Copyright (C) 2010 New Zealand Digital Library Project
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5 | *
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6 | * A component of the Greenstone digital library software
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7 | * from the New Zealand Digital Library Project at the
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8 | * University of Waikato, New Zealand.
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | *********************************************************************/
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25 |
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26 | #include "sqldbclass.h"
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27 |
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28 | sqldbclass::sqldbclass(const text_t& gsdlhome)
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29 | : dbclass(gsdlhome)
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30 | {
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31 | }
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32 |
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33 | sqldbclass::~sqldbclass()
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34 | {
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35 | }
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36 |
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37 |
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38 |
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39 | // returns array of document OIDs
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40 | text_tarray sqldbclass::get_documents_where (const text_t& sql_initial_cmd,
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41 | const text_t& sort_by)
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42 | {
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43 | text_tarray document_OIDs;
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44 |
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45 | // Get the entries in the "document_metadata" table where the 'sql_cmd'
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46 | // parameter is used to control what is located
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47 | text_t sql_cmd = sql_initial_cmd;
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48 |
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49 | // If we're sorting the documents by a certain metadata element, extend the SQL command to do this
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50 | if (sort_by != "")
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51 | {
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52 | text_tlist sbterms;
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53 | splitword(sort_by.begin(), sort_by.end(), "/", sbterms);
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54 |
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55 | text_t tags_in = "";
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56 |
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57 | while (!sbterms.empty()) {
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58 | text_t tag = sbterms.front();
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59 | sbterms.pop_front();
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60 |
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61 | if (!tag.empty()) {
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62 |
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63 | if (tag.size()>3 && (substr(tag.begin(), tag.begin()+3) == "ex.")) {
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64 | tag = substr (tag.begin()+3, tag.end());
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65 | }
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66 |
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67 | if (!tags_in.empty()) {
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68 | tags_in += ",";
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69 | }
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70 |
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71 | tags_in += "'" + sql_safe(tag) + "'";
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72 | }
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73 | }
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74 |
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75 | sql_cmd = "SELECT DISTINCT docOID FROM (" + sql_cmd + ") LEFT JOIN (SELECT docOID,value FROM document_metadata WHERE element IN (" + tags_in + ")) USING (docOID) ORDER by value";
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76 | }
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77 |
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78 | //cerr << "**** sql cmd = " << sql_cmd << endl;
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79 |
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80 | // Perform the SQL request
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81 | vector<text_tmap> sql_results;
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82 | if (!sqlgetarray(sql_cmd, sql_results) || sql_results.size() == 0)
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83 | {
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84 | return document_OIDs;
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85 | }
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86 |
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87 | // Iterate through the documents and add them to the array to be returned
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88 | vector<text_tmap>::iterator sql_results_iterator = sql_results.begin();
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89 | while (sql_results_iterator != sql_results.end())
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90 | {
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91 | text_tmap sql_result = (*sql_results_iterator);
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92 | document_OIDs.push_back(sql_result["docOID"]);
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93 | sql_results_iterator++;
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94 | }
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95 |
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96 | return document_OIDs;
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97 | }
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98 |
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99 |
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