| 1 | /**********************************************************************
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| 2 | *
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| 3 | * sqldbclass.h --
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| 4 | * Copyright (C) 2008 DL Consulting Ltd
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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 | #ifndef SQLDBCLASS_H
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| 27 | #define SQLDBCLASS_H
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| 28 |
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| 29 |
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| 30 | #include "dbclass.h"
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| 31 | #include "text_t.h"
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| 32 |
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| 33 |
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| 34 | class sqldbclass : public dbclass
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| 35 | {
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| 36 | public:
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| 37 | sqldbclass() {}
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| 38 | virtual ~sqldbclass() {}
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| 39 |
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| 40 |
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| 41 | // -----------------------------------------------------------------------------------------------
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| 42 | // These functions MUST be implemented by subclasses, as they are database-specific
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| 43 |
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| 44 | // returns array of document OIDs
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| 45 | virtual text_tarray get_documents_with_metadata_value (const text_tarray &metadata_element_names,
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| 46 | const text_t &metadata_value,
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| 47 | const text_t &sort_by_metadata_element_name) = 0;
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| 48 |
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| 49 | // returns array of values
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| 50 | virtual text_tarray get_metadata_values (const text_tarray &metadata_element_names,
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| 51 | const text_t &metadata_value_filter,
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| 52 | const text_t &metadata_value_grouping_expression) = 0;
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| 53 | };
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| 54 |
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| 55 |
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| 56 | #endif
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