Add the mapping example

It shows how to map between C++ value types and SQL types

6 files changed, 423 insertions, 1 deletions

diff --git a/makefile b/makefile
index 2ce99e2..b252863 100644
--- a/makefile
+++ b/makefile
@@ -5,7 +5,7 @@
 
 include $(dir $(lastword $(MAKEFILE_LIST)))build/bootstrap.make
 
-dirs := hello template
+dirs := hello mapping template
 dist_dirs := $(filter-out template,$(dirs))
 
 default := $(out_base)/
diff --git a/mapping/database.hxx b/mapping/database.hxx
new file mode 100644
index 0000000..d668b89
--- /dev/null
+++ b/mapping/database.hxx
@@ -0,0 +1,41 @@
+// file      : mapping/database.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+//
+// Create concrete database based on the DATABASE_* macros.
+//
+
+#include <string>
+#include <memory>   // std::auto_ptr
+#include <cstdlib>  // std::exit
+#include <iostream>
+
+#include <odb/database.hxx>
+
+#if defined(DATABASE_MYSQL)
+#  include <odb/mysql/database.hxx>
+#endif
+
+inline std::auto_ptr<odb::database>
+create_database (int& argc, char* argv[])
+{
+  using namespace std;
+  using namespace odb;
+
+  if (argc > 1 && argv[1] == string ("--help"))
+  {
+    cerr << "Usage: " << argv[0] << " [options]" << endl
+         << "Options:" << endl;
+
+#if defined(DATABASE_MYSQL)
+    mysql::database::print_usage (cerr);
+#endif
+
+    exit (0);
+  }
+
+#if defined(DATABASE_MYSQL)
+  return auto_ptr<database> (new mysql::database (argc, argv));
+#endif
+}
diff --git a/mapping/driver.cxx b/mapping/driver.cxx
new file mode 100644
index 0000000..fd878dc
--- /dev/null
+++ b/mapping/driver.cxx
@@ -0,0 +1,62 @@
+// file      : mapping/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory>   // std::auto_ptr
+#include <iostream>
+
+#include <odb/database.hxx>
+#include <odb/transaction.hxx>
+
+#include "database.hxx" // create_database
+
+#include "person.hxx"
+#include "person-odb.hxx"
+
+using namespace std;
+using namespace odb;
+
+int
+main (int argc, char* argv[])
+{
+  try
+  {
+    auto_ptr<database> db (create_database (argc, argv));
+
+    {
+      person john ("John", "Doe", date (1978, 10, 13), true);
+      person jane ("Jane", "Doe", date (1975, 11, 23), false);
+      person joe ("Joe", "Dirt", date (1973, 12, 28), true);
+
+      transaction t (db->begin_transaction ());
+
+      db->persist (john);
+      db->persist (jane);
+      db->persist (joe);
+
+      t.commit ();
+    }
+
+    {
+      typedef odb::query<person> query;
+      typedef odb::result<person> result;
+
+      transaction t (db->begin_transaction ());
+
+      result r (db->query<person> (query::married &&
+                                   query::born == date (1978, 10, 13)));
+
+      for (result::iterator i (r.begin ()); i != r.end (); ++i)
+      {
+        cout << i->first () << " " << i->last () << endl;
+      }
+
+      t.commit ();
+    }
+  }
+  catch (const odb::exception& e)
+  {
+    cerr << e.what () << endl;
+    return 1;
+  }
+}
diff --git a/mapping/makefile b/mapping/makefile
new file mode 100644
index 0000000..7b9c72e
--- /dev/null
+++ b/mapping/makefile
@@ -0,0 +1,118 @@
+# file      : mapping/makefile
+# author    : Boris Kolpackov <boris@codesynthesis.com>
+# copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+# license   : GNU GPL v2; see accompanying LICENSE file
+
+include $(dir $(lastword $(MAKEFILE_LIST)))../build/bootstrap.make
+
+cxx_tun := driver.cxx
+odb_hdr := person.hxx
+cxx_obj := $(addprefix $(out_base)/,$(cxx_tun:.cxx=.o) $(odb_hdr:.hxx=-odb.o))
+cxx_od  := $(cxx_obj:.o=.o.d)
+
+driver  := $(out_base)/driver
+dist    := $(out_base)/.dist
+test    := $(out_base)/.test
+clean   := $(out_base)/.clean
+
+# Import.
+#
+$(call import,\
+  $(scf_root)/import/odb/stub.make,\
+  odb: odb,odb-rules: odb_rules)
+
+$(call import,\
+  $(scf_root)/import/libodb/stub.make,\
+  l: odb.l,cpp-options: odb.l.cpp-options)
+
+ifdef db_id
+$(call import,\
+  $(scf_root)/import/libodb-$(db_id)/stub.make,\
+  l: odb_db.l,cpp-options: odb_db.l.cpp-options)
+endif
+
+ifeq ($(odb_db.l.cpp-options),)
+odb_db.l.cpp-options := $(out_base)/.unbuildable
+endif
+
+# Build.
+#
+$(driver): $(cxx_obj) $(odb_db.l) $(odb.l)
+$(cxx_obj) $(cxx_od): cpp_options := -I$(out_base)
+$(cxx_obj) $(cxx_od): $(odb.l.cpp-options) $(odb_db.l.cpp-options)
+
+ifeq ($(db_id),mysql)
+$(cxx_obj) $(cxx_od): cpp_options += -DDATABASE_MYSQL
+endif
+
+genf := $(addprefix $(odb_hdr:.hxx=-odb),.hxx .ixx .cxx) $(odb_hdr:.hxx=.sql)
+gen  := $(addprefix $(out_base)/,$(genf))
+
+$(gen): $(odb)
+$(gen): odb := $(odb)
+$(gen) $(dist): export odb_options += --database $(db_id) --generate-schema \
+--generate-query --hxx-prologue '\#include "traits.hxx"'
+$(gen): cpp_options := -I$(out_base)
+$(gen): $(odb.l.cpp-options)
+
+$(call include-dep,$(cxx_od),$(cxx_obj),$(gen))
+
+# Alias for default target.
+#
+$(out_base)/: $(driver)
+
+# Dist
+#
+name := $(notdir $(src_base))
+
+$(dist): db_id := @database@
+$(dist): sources := $(cxx_tun)
+$(dist): headers := $(odb_hdr)
+$(dist): export name := $(name)
+$(dist): export extra_headers := traits.hxx
+$(dist): export odb_header_stem := $(basename $(odb_hdr))
+$(dist): export extra_dist := $(call vc9projs,$(name)) $(call vc10projs,$(name))
+$(dist):
+	$(call dist-data,$(sources) $(headers) $(extra_headers) database.hxx)
+	$(call meta-automake,../template/Makefile.am)
+	$(call meta-vc9projs,../template/template,$(name))
+	$(call meta-vc10projs,../template/template,$(name))
+
+# Test.
+#
+$(test): schema := $(src_base)/$(basename $(odb_hdr)).sql
+$(test): $(driver)
+	$(call message,sql $$1,$(dcf_root)/db-driver $$1,$(schema))
+	$(call message,test $<,$< --options-file $(dcf_root)/db.options)
+
+# Clean.
+#
+$(clean):                            \
+  $(driver).o.clean                  \
+  $(addsuffix .cxx.clean,$(cxx_obj)) \
+  $(addsuffix .cxx.clean,$(cxx_od))  \
+  $(addprefix $(out_base)/,$(odb_hdr:.hxx=-odb.cxx.hxx.clean))
+
+# Generated .gitignore.
+#
+ifeq ($(out_base),$(src_base))
+$(driver): | $(out_base)/.gitignore
+
+$(out_base)/.gitignore: files := driver $(genf)
+$(clean): $(out_base)/.gitignore.clean
+
+$(call include,$(bld_root)/git/gitignore.make)
+endif
+
+# How to.
+#
+$(call include,$(bld_root)/dist.make)
+$(call include,$(bld_root)/meta/vc9proj.make)
+$(call include,$(bld_root)/meta/vc10proj.make)
+$(call include,$(bld_root)/meta/automake.make)
+
+$(call include,$(odb_rules))
+$(call include,$(bld_root)/cxx/cxx-d.make)
+$(call include,$(bld_root)/cxx/cxx-o.make)
+$(call include,$(bld_root)/cxx/o-e.make)
+
diff --git a/mapping/person.hxx b/mapping/person.hxx
new file mode 100644
index 0000000..b091944
--- /dev/null
+++ b/mapping/person.hxx
@@ -0,0 +1,114 @@
+// file      : mapping/person.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef PERSON_HXX
+#define PERSON_HXX
+
+#include <string>
+#include <ostream>
+
+#include <odb/core.hxx>
+
+// In our database boolean values are stored as strings with valid
+// values being "true" and "false".
+//
+#pragma db value(bool) type("VARCHAR(5) NOT NULL")
+
+#pragma db value type("DATE NOT NULL")
+class date
+{
+public:
+  date (unsigned int year, unsigned int month, unsigned int day)
+      : year_ (year), month_ (month), day_ (day)
+  {
+  }
+
+  unsigned int
+  year () const
+  {
+    return year_;
+  }
+
+  unsigned int
+  month () const
+  {
+    return month_;
+  }
+
+  unsigned int
+  day () const
+  {
+    return day_;
+  }
+
+private:
+  unsigned int year_;
+  unsigned int month_;
+  unsigned int day_;
+};
+
+inline std::ostream&
+operator<< (std::ostream& os, const date& d)
+{
+  return os << d.year () << '-' << d.month () << '-' << d.day ();
+}
+
+#pragma db object
+class person
+{
+public:
+  person (const std::string& first,
+          const std::string& last,
+          const date& born,
+          bool married)
+      : first_ (first), last_ (last), born_ (born), married_ (married)
+  {
+  }
+
+  const std::string&
+  first () const
+  {
+    return first_;
+  }
+
+  const std::string&
+  last () const
+  {
+    return last_;
+  }
+
+  const date&
+  born () const
+  {
+    return born_;
+  }
+
+  bool
+  married () const
+  {
+    return married_;
+  }
+
+public:
+  unsigned long
+  id () const
+  {
+    return id_;
+  }
+
+private:
+  friend class odb::access;
+
+  person (): born_ (0, 0, 0) {}
+
+  #pragma db id auto
+  unsigned long id_;
+
+  std::string first_;
+  std::string last_;
+  date born_;
+  bool married_;
+};
+
+#endif // PERSON_HXX
diff --git a/mapping/traits.hxx b/mapping/traits.hxx
new file mode 100644
index 0000000..0533360
--- /dev/null
+++ b/mapping/traits.hxx
@@ -0,0 +1,87 @@
+// file      : mapping/traits.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef TRAITS_HXX
+#define TRAITS_HXX
+
+#include <cstring>
+
+#include "person.hxx"  // date
+
+// MySQL implementation.
+//
+#if defined(DATABASE_MYSQL)
+
+#include <odb/mysql/traits.hxx>
+
+namespace odb
+{
+  namespace mysql
+  {
+    template <>
+    class value_traits<bool, details::buffer, id_string>
+    {
+    public:
+      typedef bool value_type;
+      typedef bool query_type;
+      typedef details::buffer image_type;
+
+      static void
+      set_value (bool& v,
+                 const details::buffer& b,
+                 std::size_t n,
+                 bool is_null)
+      {
+        v = (!is_null && n == 4 && std::strncmp ("true", b.data (), n) == 0);
+      }
+
+      static void
+      set_image (details::buffer& b,
+                 std::size_t& n,
+                 bool& is_null,
+                 bool v)
+      {
+        is_null = false;
+        n = v ? 4 : 5;
+
+        if (n > b.capacity ())
+          b.capacity (n);
+
+        std::memcpy (b.data (), (v ? "true" : "false"), n);
+      }
+    };
+
+    template <>
+    class value_traits<date, MYSQL_TIME, id_date>
+    {
+    public:
+      typedef date value_type;
+      typedef date query_type;
+      typedef MYSQL_TIME image_type;
+
+      static void
+      set_value (date& v, const MYSQL_TIME& i, bool is_null)
+      {
+        if (!is_null)
+          v = date (i.year, i.month, i.day);
+        else
+          v = date (0, 0, 0);
+      }
+
+      static void
+      set_image (MYSQL_TIME& i, bool& is_null, const date& v)
+      {
+        is_null = false;
+        i.neg = false;
+        i.year = v.year ();
+        i.month = v.month ();
+        i.day = v.day ();
+      }
+    };
+  }
+}
+
+#endif // DATABASE_MYSQL
+
+#endif // TRAITS_HXX