Drizzled Public API Documentation

microtime.cc

00001 /* -*- mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2008 Sun Microsystems, Inc.
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; either version 2 of the License, or
00009  *  (at your option) any later version.
00010  *
00011  *  This program is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU General Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU General Public License
00017  *  along with this program; if not, write to the Free Software
00018  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00019  */
00020 
00021 #include <config.h>
00022 #include <boost/lexical_cast.hpp>
00023 #include <drizzled/field/microtime.h>
00024 #include <drizzled/error.h>
00025 #include <drizzled/tztime.h>
00026 #include <drizzled/table.h>
00027 #include <drizzled/session.h>
00028 #include <drizzled/current_session.h>
00029 
00030 #include <math.h>
00031 
00032 #include <sstream>
00033 
00034 #include <boost/date_time/posix_time/posix_time.hpp>
00035 
00036 #include <drizzled/temporal.h>
00037 
00038 namespace drizzled
00039 {
00040 
00041 namespace field
00042 {
00043 
00044 static boost::posix_time::ptime _epoch(boost::gregorian::date(1970, 1, 1));
00045 
00046 Microtime::Microtime(unsigned char *ptr_arg,
00047                      unsigned char *null_ptr_arg,
00048                      unsigned char null_bit_arg,
00049                      enum utype unireg_check_arg,
00050                      const char *field_name_arg,
00051                      drizzled::TableShare *share) :
00052   Epoch(ptr_arg,
00053         null_ptr_arg,
00054         null_bit_arg,
00055         unireg_check_arg,
00056         field_name_arg,
00057         share)
00058 {
00059 }
00060 
00061 Microtime::Microtime(bool maybe_null_arg,
00062                      const char *field_name_arg) :
00063   Epoch(maybe_null_arg,
00064         field_name_arg)
00065 {
00066 }
00067 
00068 int Microtime::store(const char *from,
00069                      uint32_t len,
00070                      const CHARSET_INFO * const )
00071 {
00072   MicroTimestamp temporal;
00073 
00074   ASSERT_COLUMN_MARKED_FOR_WRITE;
00075 
00076   if (not temporal.from_string(from, (size_t) len))
00077   {
00078     my_error(ER_INVALID_TIMESTAMP_VALUE, MYF(ME_FATALERROR), from);
00079     return 1;
00080   }
00081 
00082   struct timeval tmp;
00083   temporal.to_timeval(tmp);
00084 
00085   uint64_t tmp_seconds= tmp.tv_sec;
00086   uint32_t tmp_micro= tmp.tv_usec;
00087 
00088   pack_num(tmp_seconds);
00089   pack_num(tmp_micro, ptr +8);
00090 
00091   return 0;
00092 }
00093 
00094 int Microtime::store_time(type::Time &ltime, type::timestamp_t )
00095 {
00096   long my_timezone;
00097   bool in_dst_time_gap;
00098 
00099   type::Time::epoch_t time_tmp;
00100   ltime.convert(time_tmp, &my_timezone, &in_dst_time_gap, true);
00101   uint64_t tmp_seconds= time_tmp;
00102   uint32_t tmp_micro= ltime.second_part;
00103 
00104   pack_num(tmp_seconds);
00105   pack_num(tmp_micro, ptr +8);
00106 
00107   return 0;
00108 }
00109 
00110 int Microtime::store(double from)
00111 {
00112   ASSERT_COLUMN_MARKED_FOR_WRITE;
00113 
00114   uint64_t from_tmp= (uint64_t)from;
00115   type::Time::usec_t fractional_seconds= (type::Time::usec_t)((from - from_tmp) * type::Time::FRACTIONAL_DIGITS) % type::Time::FRACTIONAL_DIGITS;
00116 
00117   MicroTimestamp temporal;
00118   if (not temporal.from_int64_t(from_tmp))
00119   {
00120     /* Convert the integer to a string using boost::lexical_cast */
00121     std::string tmp(boost::lexical_cast<std::string>(from));
00122 
00123     my_error(ER_INVALID_TIMESTAMP_VALUE, MYF(ME_FATALERROR), tmp.c_str());
00124     return 2;
00125   }
00126 
00127   time_t tmp;
00128   temporal.to_time_t(tmp);
00129 
00130   uint64_t tmp_micro= tmp;
00131   pack_num(tmp_micro);
00132   pack_num(fractional_seconds, ptr +8);
00133 
00134   return 0;
00135 }
00136 
00137 int Microtime::store(int64_t from, bool)
00138 {
00139   ASSERT_COLUMN_MARKED_FOR_WRITE;
00140 
00141   MicroTimestamp temporal;
00142   if (not temporal.from_int64_t(from))
00143   {
00144     /* Convert the integer to a string using boost::lexical_cast */
00145     std::string tmp(boost::lexical_cast<std::string>(from));
00146 
00147     my_error(ER_INVALID_TIMESTAMP_VALUE, MYF(ME_FATALERROR), tmp.c_str());
00148     return 2;
00149   }
00150 
00151   time_t tmp;
00152   temporal.to_time_t(tmp);
00153 
00154   uint64_t tmp_micro= tmp;
00155   pack_num(tmp_micro);
00156   pack_num(static_cast<uint32_t>(0), ptr +8);
00157 
00158   return 0;
00159 }
00160 
00161 double Microtime::val_real(void) const
00162 {
00163   uint64_t temp;
00164   type::Time::usec_t micro_temp;
00165 
00166   ASSERT_COLUMN_MARKED_FOR_READ;
00167 
00168   unpack_num(temp);
00169   unpack_num(micro_temp, ptr +8);
00170 
00171   Timestamp temporal;
00172   (void) temporal.from_time_t((time_t) temp);
00173 
00174   /* We must convert into a "timestamp-formatted integer" ... */
00175   int64_t result;
00176   temporal.to_int64_t(&result);
00177 
00178   result+= micro_temp % type::Time::FRACTIONAL_DIGITS;
00179 
00180   return result;
00181 }
00182 
00183 type::Decimal *Microtime::val_decimal(type::Decimal *decimal_value) const
00184 {
00185   type::Time ltime;
00186 
00187   get_date(ltime, 0);
00188 
00189   return date2_class_decimal(&ltime, decimal_value);
00190 }
00191 
00192 int64_t Microtime::val_int(void) const
00193 {
00194   uint64_t temp;
00195 
00196   ASSERT_COLUMN_MARKED_FOR_READ;
00197 
00198   unpack_num(temp);
00199 
00200   Timestamp temporal;
00201   (void) temporal.from_time_t((time_t) temp);
00202 
00203   /* We must convert into a "timestamp-formatted integer" ... */
00204   int64_t result;
00205   temporal.to_int64_t(&result);
00206 
00207   return result;
00208 }
00209 
00210 String *Microtime::val_str(String *val_buffer, String *) const
00211 {
00212   uint64_t temp= 0;
00213   type::Time::usec_t micro_temp= 0;
00214 
00215   unpack_num(temp);
00216   unpack_num(micro_temp, ptr +8);
00217 
00218   type::Time tmp_time;
00219   tmp_time.store(temp, micro_temp);
00220 
00221   tmp_time.convert(*val_buffer);
00222 
00223 
00224   return val_buffer;
00225 }
00226 
00227 bool Microtime::get_date(type::Time &ltime, uint32_t) const
00228 {
00229   uint64_t temp;
00230   uint32_t micro_temp= 0;
00231 
00232   unpack_num(temp);
00233   unpack_num(micro_temp, ptr +8);
00234   
00235   ltime.reset();
00236 
00237   ltime.store(temp, micro_temp);
00238 
00239   return false;
00240 }
00241 
00242 bool Microtime::get_time(type::Time &ltime) const
00243 {
00244   return Microtime::get_date(ltime, 0);
00245 }
00246 
00247 int Microtime::cmp(const unsigned char *a_ptr, const unsigned char *b_ptr)
00248 {
00249   uint64_t a,b;
00250   uint32_t a_micro, b_micro;
00251 
00252   unpack_num(a, a_ptr);
00253   unpack_num(a_micro, a_ptr +8);
00254 
00255   unpack_num(b, b_ptr);
00256   unpack_num(b_micro, b_ptr +8);
00257 
00258   if (a == b)
00259     return (a_micro < b_micro) ? -1 : (a_micro > b_micro) ? 1 : 0;
00260 
00261   return (a < b) ? -1 : (a > b) ? 1 : 0;
00262 }
00263 
00264 
00265 void Microtime::sort_string(unsigned char *to,uint32_t )
00266 {
00267 #ifdef WORDS_BIGENDIAN
00268   if ((not getTable()) or (not getTable()->getShare()->db_low_byte_first))
00269   {
00270     std::reverse_copy(to, to+pack_length(), ptr);
00271     std::reverse_copy(to +8, to+pack_length(), ptr +8);
00272   }
00273   else
00274 #endif
00275   {
00276     memcpy(to, ptr, pack_length());
00277   }
00278 }
00279 
00280 void Microtime::sql_type(String &res) const
00281 {
00282   res.set_ascii(STRING_WITH_LEN("microsecond timestamp"));
00283 }
00284 
00285 void Microtime::set_time()
00286 {
00287   Session *session= getTable() ? getTable()->in_use : current_session;
00288 
00289   type::Time::usec_t fractional_seconds= 0;
00290   uint64_t epoch_seconds= session->getCurrentTimestampEpoch(fractional_seconds);
00291 
00292   set_notnull();
00293   pack_num(epoch_seconds);
00294   pack_num(fractional_seconds, ptr +8);
00295 }
00296 
00297 long Microtime::get_timestamp(bool *null_value) const
00298 {
00299   if ((*null_value= is_null()))
00300     return 0;
00301 
00302   uint64_t tmp;
00303   return unpack_num(tmp);
00304 }
00305 
00306 } /* namespace field */
00307 } /* namespace drizzled */