94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/***********************************************************************
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tquery4.cpp - Tests other details about template queries, like unquoted
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parameters, multiple parameters, and preventing problems with LIKE
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patterns. This exists more for code coverage than to demonstrate
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the library.
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Copyright (c) 2009 by Martin Gallwey and (c) 2009 by Educational
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Technology Resources, Inc. Others may also hold copyrights on code
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in this file. See the CREDITS.txt file in the top directory of the
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distribution for details.
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This file is part of MySQL++.
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MySQL++ is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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MySQL++ is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with MySQL++; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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***********************************************************************/
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#include "cmdline.h"
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#include "printdata.h"
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#include <iostream>
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using namespace std;
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int
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main(int argc, char *argv[])
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{
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// Get database access parameters from command line
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mysqlpp::examples::CommandLine cmdline(argc, argv);
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if (!cmdline) {
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return 1;
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}
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try {
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// Establish the connection to the database server.
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mysqlpp::Connection con(mysqlpp::examples::db_name,
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cmdline.server(), cmdline.user(), cmdline.pass());
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// Modify an item using two named template query parameters
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mysqlpp::Query query = con.query("update stock "
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"set num = %0:quantity where num < %0:quantity");
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query.parse();
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query.template_defaults["quantity"] = 70;
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cout << "Query: " << query << endl;
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mysqlpp::SimpleResult result = query.execute();
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// Print the new table contents.
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print_stock_table(query);
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// Now let's check multiple dissimilar parameter types, and show
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// how to avoid conflicts between '%' as used in tqueries vs in
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// LIKE patterns.
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query.reset();
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query << "select * from stock where weight > %0q or "
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"description like '%%%1%%'";
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query.parse();
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cout << "\nQuery: " << query.str(1.2, "Mustard") << endl;
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mysqlpp::StoreQueryResult res = query.store(1.2, "Mustard");
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// Show what second tquery found
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print_stock_rows(res);
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}
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catch (const mysqlpp::BadQuery& er) {
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// Handle any query errors
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cerr << "Query error: " << er.what() << endl;
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return -1;
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}
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catch (const mysqlpp::BadConversion& er) {
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// Handle bad conversions
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cerr << "Conversion error: " << er.what() << endl <<
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"\tretrieved data size: " << er.retrieved <<
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", actual size: " << er.actual_size << endl;
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return -1;
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}
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catch (const mysqlpp::Exception& er) {
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// Catch-all for any other MySQL++ exceptions
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cerr << "Error: " << er.what() << endl;
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return -1;
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}
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return 0;
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}
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