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pqxx-object/update_query.cc

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00001 // database update query class                                   -*- C++ -*-
00002 // $Id: update_query.cc,v 1.1 2004/04/01 10:13:09 roger Exp $
00003 //
00004 // Copyright (C) 2003  Roger Leigh <rleigh@debian.org>
00005 //
00006 //
00007 //  All rights reserved.
00008 //
00009 //  Redistribution and use in source and binary forms, with or without
00010 //  modification, are permitted provided that the following conditions
00011 //  are met:
00012 //
00013 //  * Redistributions of source code must retain the above copyright
00014 //    notice, this list of conditions and the following disclaimer.
00015 //  * Redistributions in binary form must reproduce the above
00016 //    copyright notice, this list of conditions and the following
00017 //    disclaimer in the documentation and/or other materials provided
00018 //    with the distribution.
00019 //  * Neither the name of the author, nor the names of other
00020 //    contributors may be used to endorse or promote products derived
00021 //    from this software without specific prior written permission.
00022 //
00023 //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
00024 //  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
00025 //  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00026 //  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00027 //  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
00028 //  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00029 //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00030 //  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00031 //  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
00032 //  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
00033 //  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00034 //  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00035 //  SUCH DAMAGE.
00036 //
00038 
00039 #include <pqxx-object/update_query.h>
00040 
00041 using namespace pqxxobject;
00042 
00043 update_query::update_query():
00044   pqxxobject::query(),
00045   m_table_name(),
00046   m_field_list(),
00047   m_where()
00048 {
00049 }
00050 
00051 update_query::update_query(const std::string& table):
00052   pqxxobject::query(),
00053   m_table_name(table),
00054   m_field_list(),
00055   m_where()
00056 {
00057 }
00058 
00059 update_query::update_query(const update_query& rhs):
00060   pqxxobject::query(*this),
00061   m_table_name(rhs.m_table_name),
00062   m_field_list(rhs.m_field_list),
00063   m_where(rhs.m_where)
00064 {
00065 }
00066 
00067 update_query::~update_query()
00068 {
00069 }
00070 
00071 void
00072 update_query::remove(const pqxxobject::field_base& field)
00073 {
00074   for (std::list<field_value>::iterator iter = m_field_list.begin();
00075        iter != m_field_list.end();
00076        ++iter)
00077     {
00078       if (iter->first == field.get_column_name())
00079         {
00080           iter = m_field_list.erase(iter);
00081         }
00082     }
00083 }
00084 
00085 #include <iostream>
00086 
00087 std::string update_query::str()
00088 {
00089   // Erase the previous query (if any).
00090   m_string.str("");
00091   // Construct the new query.
00092   if (m_field_list.size() > 0)
00093     {
00094       m_string << "UPDATE " << m_table_name << " SET ";
00095       for (std::list<field_value>::const_iterator iter = m_field_list.begin();
00096            iter != m_field_list.end();
00097            ++iter)
00098         {
00099           if (iter != m_field_list.begin())
00100             m_string << ", "; // For all but the first field.
00101           m_string << iter->first << " = " << iter->second;
00102         }
00103       if (m_where.length())
00104         m_string << " WHERE (" << m_where << ')';
00105     }
00106   return m_string.str();
00107 }

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