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# type_info.h

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    00001
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    00006
    00007 /***********************************************************************
    00008  Copyright (c) 1998 by Kevin Atkinson, (c) 1999-2001 by MySQL AB, and
    00009  (c) 2004-2008 by Educational Technology Resources, Inc.  Others may
    00010  also hold copyrights on code in this file.  See the CREDITS file in
    00011  the top directory of the distribution for details.
    00012
    00013  This file is part of MySQL++.
    00014
    00015  MySQL++ is free software; you can redistribute it and/or modify it
    00016  under the terms of the GNU Lesser General Public License as published
    00017  by the Free Software Foundation; either version 2.1 of the License, or
    00018  (at your option) any later version.
    00019
    00020  MySQL++ is distributed in the hope that it will be useful, but WITHOUT
    00021  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    00022  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
    00023  License for more details.
    00024
    00025  You should have received a copy of the GNU Lesser General Public
    00026  License along with MySQL++; if not, write to the Free Software
    00027  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
    00028  USA
    00029 ***********************************************************************/
    00030
    00031 #if !defined(MYSQLPP_TYPE_INFO_H)
    00032 #define MYSQLPP_TYPE_INFO_H
    00033
    00034 #include "common.h"
    00035
    00036 #include "exceptions.h"
    00037
    00038 #include <map>
    00039 #include <sstream>
    00040 #include <typeinfo>
    00041
    00042 namespace mysqlpp {
    00043
    00044 #if !defined(DOXYGEN_IGNORE)
    00045 // Doxygen will not generate documentation for this section.
    00046
    00047 class MYSQLPP_EXPORT mysql_type_info;
    00048 class MYSQLPP_EXPORT mysql_ti_sql_type_info_lookup;
    00049
    00050 class MYSQLPP_EXPORT mysql_ti_sql_type_info
    00051 {
    00052 private:
    00053         // For use with flags_ bitset
    00054         enum {
    00055                 tf_default = 1,
    00056                 tf_null = 2,
    00057                 tf_unsigned = 4
    00058         };
    00059
    00060         friend class mysql_type_info;
    00061         friend class mysql_ti_sql_type_info_lookup;
    00062
    00063         mysql_ti_sql_type_info& operator=(
    00064                         const mysql_ti_sql_type_info& b);
    00065
    00066         // Not initting _base_type and _default because only mysql_type_info
    00067         // can create them.  There *must* be only one copy of each.
    00068         mysql_ti_sql_type_info() :
    00069         sql_name_(0),
    00070         c_type_(0),
    00071         base_type_(
    00072 #if MYSQL_VERSION_ID > 40000
    00073                 MYSQL_TYPE_NULL
    00074 #else
    00075                 FIELD_TYPE_NULL
    00076 #endif
    00077         ),
    00078         flags_(0)
    00079         {
    00080         }
    00081
    00082         mysql_ti_sql_type_info(const char* s,
    00083                         const std::type_info& t, const enum_field_types bt,
    00084                         const unsigned int flags = 0) :
    00085         sql_name_(s),
    00086         c_type_(&t),
    00087         base_type_(bt),
    00088         flags_(flags)
    00089         {
    00090         }
    00091
    00092         bool is_default() const { return flags_ & tf_default; }
    00093         bool is_null() const { return flags_ & tf_null; }
    00094         bool is_unsigned() const { return flags_ & tf_unsigned; }
    00095
    00096         const char* sql_name_;
    00097         const std::type_info* c_type_;
    00098         const enum_field_types base_type_;
    00099         const unsigned int flags_;
    00100 };
    00101
    00102
    00103 struct type_info_cmp
    00104 {
    00105         bool operator() (const std::type_info* lhs,
    00106                         const std::type_info* rhs) const
    00107         {
    00108                 return lhs->before(*rhs) != 0;
    00109         }
    00110 };
    00111
    00112 class MYSQLPP_EXPORT mysql_ti_sql_type_info_lookup
    00113 {
    00114 private:
    00115         friend class mysql_type_info;
    00116
    00117         typedef mysql_ti_sql_type_info sql_type_info;
    00118         typedef std::map<const std::type_info*, unsigned char, type_info_cmp>
    00119                         map_type;
    00120
    00121         mysql_ti_sql_type_info_lookup(const sql_type_info types[],
    00122                         const int size);
    00123
    00124         const unsigned char& operator [](
    00125                         const std::type_info& ti) const
    00126         {
    00127                 map_type::const_iterator it = map_.find(&ti);
    00128                 if (it != map_.end()) {
    00129                         return it->second;
    00130                 }
    00131                 else {
    00132                         std::ostringstream outs;
    00133                         outs << "Failed to find MySQL C API type ID for " << ti.name();
    00134                         throw TypeLookupFailed(outs.str());
    00135                 }
    00136         }
    00137
    00138         map_type map_;
    00139 };
    00140
    00141 #endif // !defined(DOXYGEN_IGNORE)
    00142
    00143
    00148 class MYSQLPP_EXPORT mysql_type_info
    00149 {
    00150 public:
    00158         mysql_type_info() :
    00159         num_(static_cast<unsigned char>(-1))
    00160         {
    00161         }
    00162
    00168         mysql_type_info(enum_field_types t, bool _unsigned = false,
    00169                         bool _null = false) :
    00170         num_(type(t, _unsigned, _null))
    00171         {
    00172         }
    00173
    00175         mysql_type_info(const mysql_type_info& t) :
    00176         num_(t.num_)
    00177         {
    00178         }
    00179
    00184         mysql_type_info(const std::type_info& t) :
    00185         num_(lookups[t])
    00186         {
    00187         }
    00188
    00190         mysql_type_info& operator =(const mysql_type_info& t)
    00191         {
    00192                 num_ = t.num_;
    00193                 return *this;
    00194         }
    00195
    00200         mysql_type_info& operator =(const std::type_info& t)
    00201         {
    00202                 num_ = lookups[t];
    00203                 return *this;
    00204         }
    00205
    00210         const char* name() const { return deref().c_type_->name(); }
    00211
    00215         const char* sql_name() const { return deref().sql_name_; }
    00216
    00221         const std::type_info& c_type() const { return *deref().c_type_; }
    00222
    00228         const mysql_type_info base_type() const
    00229         {
    00230                 return mysql_type_info(deref().base_type_);
    00231         }
    00232
    00238         int id() const
    00239         {
    00240                 return num_;
    00241         }
    00242
    00248         bool quote_q() const;
    00249
    00255         bool escape_q() const;
    00256
    00261         bool before(mysql_type_info& b)
    00262         {
    00263                 return num_ < b.num_;
    00264         }
    00265
    00270         static const enum_field_types string_type =
    00271 #if MYSQL_VERSION_ID > 40000
    00272                 MYSQL_TYPE_STRING;
    00273 #else
    00274                 FIELD_TYPE_STRING;
    00275 #endif
    00276
    00277 private:
    00278         typedef mysql_ti_sql_type_info sql_type_info;
    00279         typedef mysql_ti_sql_type_info_lookup sql_type_info_lookup;
    00280
    00281         static const sql_type_info types[];
    00282         static const int num_types;
    00283
    00284         static const sql_type_info_lookup lookups;
    00285
    00304         static unsigned char type(enum_field_types t,
    00305                         bool _unsigned, bool _null = false);
    00306
    00307         const sql_type_info& deref() const
    00308         {
    00309                 return types[num_];
    00310         }
    00311
    00312         unsigned char num_;
    00313 };
    00314
    00316 inline bool operator ==(const mysql_type_info& a, const mysql_type_info& b)
    00317 {
    00318         return a.id() == b.id();
    00319 }
    00320
    00322 inline bool operator !=(const mysql_type_info& a, const mysql_type_info& b)
    00323 {
    00324         return a.id() != b.id();
    00325 }
    00326
    00329 inline bool operator ==(const std::type_info& a, const mysql_type_info& b)
    00330 {
    00331         return a == b.c_type();
    00332 }
    00333
    00336 inline bool operator !=(const std::type_info& a, const mysql_type_info& b)
    00337 {
    00338         return a != b.c_type();
    00339 }
    00340
    00343 inline bool operator ==(const mysql_type_info& a, const std::type_info& b)
    00344 {
    00345         return a.c_type() == b;
    00346 }
    00347
    00350 inline bool operator !=(const mysql_type_info& a, const std::type_info& b)
    00351 {
    00352         return a.c_type() != b;
    00353 }
    00354
    00355 }                                                               // end namespace mysqlpp
    00356
    00357 #endif // !defined(MYSQLPP_TYPE_INFO_H)
    00358