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# insertpolicy.h

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    00032 /***********************************************************************
    00033  Copyright (c) 2008-2009 by AboveNet, Inc., and (c) 2009 by Educational
    00034  Technology Resources, Inc.  Others may also hold copyrights on code
    00035  in this file.  See the CREDITS file in the top directory of the
    00036  distribution for details.
    00037
    00038  This file is part of MySQL++.
    00039
    00040  MySQL++ is free software; you can redistribute it and/or modify it
    00041  under the terms of the GNU Lesser General Public License as published
    00042  by the Free Software Foundation; either version 2.1 of the License, or
    00043  (at your option) any later version.
    00044
    00045  MySQL++ is distributed in the hope that it will be useful, but WITHOUT
    00046  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    00047  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
    00048  License for more details.
    00049
    00050  You should have received a copy of the GNU Lesser General Public
    00051  License along with MySQL++; if not, write to the Free Software
    00052  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
    00053  USA
    00054 ***********************************************************************/
    00055
    00056 #if !defined(MYSQLPP_INSERTPOLICY_H)
    00057 #define MYSQLPP_INSERTPOLICY_H
    00058
    00065 template <class AccessController = Transaction>
    00066 class MYSQLPP_EXPORT RowCountInsertPolicy
    00067 {
    00068 public:
    00070         RowCountInsertPolicy(unsigned int rows) :
    00071         cur_rows_(0),
    00072         max_rows_(rows)
    00073         {
    00074         }
    00075
    00077         ~RowCountInsertPolicy() { }
    00078
    00083         template <class RowT>
    00084         bool can_add(int, const RowT&)
    00085         {
    00086                 if (++cur_rows_ > max_rows_) {
    00087                         cur_rows_ = 0;
    00088                         return false;
    00089                 }
    00090                 else {
    00091                         return true;
    00092                 }
    00093         }
    00094
    00096         typedef AccessController access_controller;
    00097
    00098 private:
    00099         unsigned int cur_rows_;
    00100         unsigned const int max_rows_;
    00101 };
    00102
    00103
    00111 template <class AccessController = Transaction>
    00112 class MYSQLPP_EXPORT SizeThresholdInsertPolicy
    00113 {
    00114 public:
    00116         SizeThresholdInsertPolicy(int size) :
    00117         size_(size)
    00118         {
    00119         }
    00120
    00122         ~SizeThresholdInsertPolicy() { }
    00123
    00131         template <class RowT>
    00132         bool can_add(int size, const RowT& object) const
    00133         {
    00134                 return (size < size_);
    00135         }
    00136
    00138         typedef AccessController access_controller;
    00139
    00140 private:
    00141         int size_;
    00142 };
    00143
    00144
    00152 template <class AccessController = Transaction>
    00153 class MYSQLPP_EXPORT MaxPacketInsertPolicy
    00154 {
    00155 public:
    00161         MaxPacketInsertPolicy(Connection* con, int size) :
    00162         conn_(con), size_(size)
    00163         {
    00164         }
    00165
    00174         MaxPacketInsertPolicy(int size) :
    00175         conn_(0), size_(size)
    00176         {
    00177         }
    00178
    00180         ~MaxPacketInsertPolicy() { }
    00181
    00189         template <class RowT>
    00190         bool can_add(int size, const RowT& object) const
    00191         {
    00192                 if (size < size_) {
    00193                         // Haven't hit size threshold yet, so see if this next
    00194                         // item pushes it over the line.
    00195                         SQLStream s(conn_);
    00196                         s << ",(" << object.value_list() << ")";
    00197                         return (size_ - size) >= static_cast<int>(s.str().size());
    00198                 }
    00199                 else {
    00200                         // Already too much in query buffer!
    00201                         return false;
    00202                 }
    00203         }
    00204
    00206         typedef AccessController access_controller;
    00207
    00208 private:
    00209         Connection* conn_;
    00210         int size_;
    00211 };
    00212
    00213 #endif // !defined(MYSQLPP_INSERTPOLICY_H)
    00214