109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
/***********************************************************************
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ssqls3.cpp - Example showing how to update an SQL row using the
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Specialized SQL Structures feature of MySQL++.
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Copyright (c) 1998 by Kevin Atkinson, (c) 1999-2001 by MySQL AB, and
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(c) 2004-2009 by Educational Technology Resources, Inc. Others may
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also hold copyrights on code in this file. See the CREDITS.txt file
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in the top directory of the 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 "stock.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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// Build a query to retrieve the stock item that has Unicode
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// characters encoded in UTF-8 form.
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mysqlpp::Query query = con.query("select * from stock ");
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query << "where item = " << mysqlpp::quote << "Nürnberger Brats";
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// Retrieve the row, throwing an exception if it fails.
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mysqlpp::StoreQueryResult res = query.store();
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if (res.empty()) {
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throw mysqlpp::BadQuery("UTF-8 bratwurst item not found in "
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"table, run resetdb");
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}
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// Because there should only be one row in the result set,
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// there's no point in storing the result in an STL container.
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// We can store the first row directly into a stock structure
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// because one of an SSQLS's constructors takes a Row object.
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stock row = res[0];
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// Create a copy so that the replace query knows what the
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// original values are.
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stock orig_row = row;
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// Change the stock object's item to use only 7-bit ASCII, and
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// to deliberately be wider than normal column widths printed
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// by print_stock_table().
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row.item = "Nuerenberger Bratwurst";
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// Form the query to replace the row in the stock table.
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query.update(orig_row, row);
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// Show the query about to be executed.
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cout << "Query: " << query << endl;
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// Run the query with execute(), since UPDATE doesn't return a
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// result set.
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query.execute();
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// Retrieve and print out the new table contents.
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print_stock_table(query);
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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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