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/* |
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* This file is a part of morm |
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* and is distributed under the 2-Clause BSD licence. |
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* Author: Tomasz Sowa <t.sowa@ttmath.org> |
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*/ |
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|
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/* |
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* Copyright (c) 2018-2019, Tomasz Sowa |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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|
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#include "postgresqlqueryresult.h" |
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|
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|
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|
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namespace morm |
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{ |
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|
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|
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PostgreSQLQueryResult::PostgreSQLQueryResult() |
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{ |
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psql_result = nullptr; |
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psql_status = PGRES_EMPTY_QUERY; |
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} |
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|
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|
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void PostgreSQLQueryResult::clear() |
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{ |
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if( psql_result ) |
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{ |
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PQclear(psql_result); |
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} |
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|
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psql_result = nullptr; |
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psql_status = PGRES_EMPTY_QUERY; |
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|
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QueryResult::clear(); |
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} |
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|
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|
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bool PostgreSQLQueryResult::has_db_result() |
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{ |
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return psql_result != nullptr; |
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} |
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|
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|
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const char * PostgreSQLQueryResult::get_field_string_value(int column_index) |
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{ |
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const char * value_str = nullptr; |
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|
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if( psql_result && column_index >= 0 && (size_t)column_index < result_cols ) |
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{ |
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if( cur_row < result_rows ) |
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{ |
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value_str = PQgetvalue(psql_result, cur_row, column_index); |
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} |
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} |
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|
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return value_str; |
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} |
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|
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|
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|
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const char * PostgreSQLQueryResult::get_field_string_value(const char * column_name) |
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{ |
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const char * value_str = nullptr; |
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|
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if( psql_result ) |
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{ |
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int col_index = PQfnumber(psql_result, column_name); |
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|
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if( col_index != -1 ) |
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{ |
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if( cur_row < result_rows ) |
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{ |
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value_str = PQgetvalue(psql_result, cur_row, col_index); |
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} |
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} |
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} |
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|
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return value_str; |
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} |
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|
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|
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|
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int PostgreSQLQueryResult::get_column_index(const char * column_name) |
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{ |
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int col_index = -1; |
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|
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if( psql_result ) |
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{ |
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col_index = PQfnumber(psql_result, column_name); |
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// returns -1 if there is no such a column |
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} |
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|
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return col_index; |
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} |
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|
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|
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bool PostgreSQLQueryResult::is_null(int column_index) |
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{ |
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bool res = false; |
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|
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if( column_index >= 0 && (size_t)column_index < result_cols ) |
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{ |
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if( cur_row < result_rows ) |
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{ |
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res = is_null(cur_row, column_index); |
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} |
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} |
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|
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return res; |
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} |
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|
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|
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/* |
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* in the future we can use single row mode: |
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* https://www.postgresql.org/docs/10/libpq-single-row-mode.html |
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* |
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* or just cursors from database: |
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* https://www.postgresql.org/docs/current/sql-fetch.html |
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* |
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*/ |
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const char * PostgreSQLQueryResult::get_value_from_result(int row, int col) |
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{ |
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const char * value_str = nullptr; |
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|
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if( psql_result ) |
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{ |
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value_str = PQgetvalue(psql_result, row, col); |
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// can return a null pointer if there is no such an item in the last psql_result |
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} |
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|
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return value_str; |
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} |
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|
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|
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int PostgreSQLQueryResult::get_value_length(int row, int col) |
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{ |
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int len = 0; |
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|
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if( psql_result ) |
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{ |
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len = PQgetlength(psql_result, row, col); |
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} |
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|
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return len; |
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} |
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|
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|
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bool PostgreSQLQueryResult::is_null(int row, int col) |
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{ |
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bool is_null = false; |
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|
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if( psql_result ) |
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{ |
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is_null = (PQgetisnull(psql_result, row, col) == 1); |
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} |
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|
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return is_null; |
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} |
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|
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|
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void PostgreSQLQueryResult::dump_column_names(PT::Log & log) |
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{ |
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if( psql_result ) |
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{ |
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int cols = PQnfields(psql_result); |
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|
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for(int i = 0 ; i < cols ; ++i) |
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{ |
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log << i << ' ' << PQfname(psql_result, i) << PT::Log::logend; |
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} |
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} |
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} |
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|
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|
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//int PostgreSQLQueryResult::Rows(PGresult * r) |
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//{ |
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// // PQntuples - Returns the number of rows (tuples) in the query result. Because it returns |
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// // an integer result, large result sets might overflow the return value on 32-bit operating systems. |
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// return PQntuples(r); |
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//} |
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|
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|
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//int PostgreSQLQueryResult::Cols(PGresult * r) |
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//{ |
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// // PQnfields - Returns the number of columns (fields) in each row of the query result. |
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// return PQnfields(r); |
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//} |
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|
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//long PostgreSQLQueryResult::AffectedRows(PGresult * r) |
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//{ |
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// // PQcmdTuples - This function returns a string containing the number of rows affected by the SQL |
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// // statement that generated the PGresult. This function can only be used following the execution |
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// // of an INSERT, UPDATE, DELETE, MOVE, FETCH, or COPY statement, or [...] |
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// char * rows_str = PQcmdTuples(r); // can be an empty string |
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// long rows = 0; |
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// |
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// if( rows_str ) |
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// { |
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// rows = strtol(rows_str, 0, 10); |
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// // strtol - If an overflow or underflow occurs, errno is set to ERANGE |
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// // and the function return value is clamped according to the following table: |
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// // Function underflow overflow |
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// // strtol() LONG_MIN LONG_MAX |
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// |
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// if( rows < 0 ) |
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// rows = 0; |
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// } |
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// |
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//return rows; |
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//} |
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|
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|
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//void PostgreSQLConnector::get_value_bin(int row, int col, std::string & result, bool clear_string) |
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//{ |
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// if( clear_string ) |
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// result.clear(); |
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// |
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// const char * raw_result = get_value(row, col); |
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// |
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// if( raw_result ) |
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// { |
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// int len = PQgetlength(last_result, row, col); |
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// |
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// if( len > 0 ) |
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// { |
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// unescape_bin(raw_result, len, result); |
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// } |
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// } |
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//} |
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|
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|
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//bool PostgreSQLConnector::AssertValueSpace(PGresult * r, int row, int col, PT::Space & space) |
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//{ |
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// const char * res = AssertValue(r, row, col); |
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// |
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// conf_parser.SetSpace(space); |
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// space.Clear(); |
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// |
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// PT::SpaceParser::Status status = conf_parser.ParseString(res); |
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// |
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// if( status != PT::SpaceParser::ok ) |
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// { |
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// log << log1 << "Morm: a problem with parsing a PT::Space"; |
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// |
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// if( status == PT::SpaceParser::syntax_error ) |
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// log << ", syntax error at line: " << conf_parser.line; |
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// |
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// log << logend; |
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// |
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// space.Clear(); |
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// return false; |
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// } |
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// |
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//return true; |
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//} |
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|
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} // namespace |
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