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authorBoris Kolpackov <boris@codesynthesis.com>2011-03-01 11:56:33 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2011-03-01 11:56:33 +0200
commit5a14aa4978cca949f3d07561ba35f8fd3af76ab2 (patch)
tree4c5e54ca7daf83130fd06f16db56b517ea254ce6 /schema/embedded
parent2ef165437ce47f50110a9b230f302c5cd5fde1d4 (diff)
Add support for embedded database schemas
New options: --schema-format, --default-schema. New example: schema/embedded.
Diffstat (limited to 'schema/embedded')
-rw-r--r--schema/embedded/README51
-rw-r--r--schema/embedded/database.hxx46
-rw-r--r--schema/embedded/driver.cxx97
-rw-r--r--schema/embedded/makefile117
-rw-r--r--schema/embedded/person.hxx60
5 files changed, 371 insertions, 0 deletions
diff --git a/schema/embedded/README b/schema/embedded/README
new file mode 100644
index 0000000..d353bd0
--- /dev/null
+++ b/schema/embedded/README
@@ -0,0 +1,51 @@
+This example shows how to generate and use a database schema that is embedded
+into the application rather than stored as a separate SQL file.
+
+The example consists of the following files:
+
+person.hxx
+ Header file defining the 'person' persistent class.
+
+person-odb.hxx
+person-odb.ixx
+person-odb.cxx
+ These files contain the database support code as well as the embedded
+ database schema for the person.hxx header. They are generated by the ODB
+ compiler from person.hxx using the following command line:
+
+ odb -d <database> --generate-schema --schema-format embedded \
+ --generate-query person.hxx
+
+ Where <database> stands for the database system we are using, for example,
+ 'mysql'.
+
+ The --generate-schema option requests the generation of the database schema.
+ The --schema-format option is used to instruct the ODB compiler to embed the
+ schema into the generated C++ files.
+
+database.hxx
+ Contains the create_database() function which instantiates the concrete
+ database class corresponding to the database system we are using.
+
+driver.cxx
+ Driver for the example. It includes the person.hxx and person-odb.hxx
+ headers to gain access to the persistent classes and their database support
+ code. It also includes database.hxx for the create_database() function
+ declaration.
+
+ In main() the driver first calls create_database() to obtain the database
+ instance. It then uses the ODB schema catalog to create the database
+ schema. During this step the generated code issues a number of SQL
+ statements that drop and create necessary database tables, etc.
+
+ After the database schema is ready, the driver persists a number of 'person'
+ objects, performs a database query, and prints the information about the
+ returned objects.
+
+To run the driver, using MySQL as an example, we can execute the following
+command:
+
+./driver --user odb_test --database odb_test
+
+Here we use 'odb_test' as the database login and also 'odb_test' as the
+database name.
diff --git a/schema/embedded/database.hxx b/schema/embedded/database.hxx
new file mode 100644
index 0000000..7483f52
--- /dev/null
+++ b/schema/embedded/database.hxx
@@ -0,0 +1,46 @@
+// file : schema/embedded/database.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+//
+// Create concrete database instance based on the DATABASE_* macros.
+//
+
+#ifndef DATABASE_HXX
+#define DATABASE_HXX
+
+#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::core;
+
+ if (argc > 1 && argv[1] == string ("--help"))
+ {
+ cerr << "Usage: " << argv[0] << " [options]" << endl
+ << "Options:" << endl;
+
+#if defined(DATABASE_MYSQL)
+ odb::mysql::database::print_usage (cerr);
+#endif
+
+ exit (0);
+ }
+
+#if defined(DATABASE_MYSQL)
+ return auto_ptr<database> (new odb::mysql::database (argc, argv));
+#endif
+}
+
+#endif // DATABASE_HXX
diff --git a/schema/embedded/driver.cxx b/schema/embedded/driver.cxx
new file mode 100644
index 0000000..aeba3ee
--- /dev/null
+++ b/schema/embedded/driver.cxx
@@ -0,0 +1,97 @@
+// file : schema/embedded/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 <odb/schema-catalog.hxx>
+
+#include "database.hxx" // create_database
+
+#include "person.hxx"
+#include "person-odb.hxx"
+
+using namespace std;
+using namespace odb::core;
+
+int
+main (int argc, char* argv[])
+{
+ try
+ {
+ typedef odb::query<person> query;
+ typedef odb::result<person> result;
+
+ auto_ptr<database> db (create_database (argc, argv));
+
+ // Create the database schema.
+ //
+ {
+ transaction t (db->begin ());
+ schema_catalog::create_schema (*db);
+ t.commit ();
+ }
+
+ // The following alternative version only creates the schema if it
+ // hasn't already been created. To detect the existence of the schema
+ // this version tries to query the database for a person object. If
+ // the corresponding table does not exist, then an exceptions will be
+ // thrown in which case we proceed to creating the schema.
+ //
+ /*
+ {
+ transaction t (db->begin ());
+
+ try
+ {
+ db->query<person> (false);
+ }
+ catch (const odb::exception& e)
+ {
+ schema_catalog::create_schema (*db);
+ }
+
+ t.commit ();
+ }
+ */
+
+ // Create a few persistent person objects.
+ //
+ {
+ person john ("John", "Doe", 33);
+ person jane ("Jane", "Doe", 32);
+ person joe ("Joe", "Dirt", 30);
+
+ transaction t (db->begin ());
+
+ db->persist (john);
+ db->persist (jane);
+ db->persist (joe);
+
+ t.commit ();
+ }
+
+ // Print those over 30.
+ //
+ {
+ transaction t (db->begin ());
+
+ result r (db->query<person> (query::age > 30));
+
+ 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/schema/embedded/makefile b/schema/embedded/makefile
new file mode 100644
index 0000000..639505e
--- /dev/null
+++ b/schema/embedded/makefile
@@ -0,0 +1,117 @@
+# file : schema/embedded/makefile
+# author : Boris Kolpackov <boris@codesynthesis.com>
+# copyright : Copyright (c) 2009-2011 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)
+gen := $(addprefix $(out_base)/,$(genf))
+
+$(gen): $(odb)
+$(gen): odb := $(odb)
+$(gen) $(dist): export odb_options += --database $(db_id) --generate-query \
+--generate-schema --schema-format embedded
+
+$(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 := $(subst /,-,$(subst $(src_root)/,,$(src_base)))
+
+$(dist): db_id := @database@
+$(dist): sources := $(cxx_tun)
+$(dist): headers := $(odb_hdr)
+$(dist): export name := $(name)
+$(dist): export odb_header_stem := $(basename $(odb_hdr))
+$(dist): export extra_dist := README $(call vc9projs,$(name)) \
+$(call vc10projs,$(name))
+$(dist):
+ $(call dist-data,$(sources) $(headers) README database.hxx)
+ $(call meta-automake,../../template/Makefile.am)
+ $(call meta-vc9projs,../../template/template,$(name))
+ $(call meta-vc10projs,../../template/template,$(name))
+
+# Test.
+#
+$(test): $(driver)
+ $(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/schema/embedded/person.hxx b/schema/embedded/person.hxx
new file mode 100644
index 0000000..a3d44b9
--- /dev/null
+++ b/schema/embedded/person.hxx
@@ -0,0 +1,60 @@
+// file : schema/embedded/person.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef PERSON_HXX
+#define PERSON_HXX
+
+#include <string>
+
+#include <odb/core.hxx>
+
+#pragma db object
+class person
+{
+public:
+ person (const std::string& first,
+ const std::string& last,
+ unsigned short age)
+ : first_ (first), last_ (last), age_ (age)
+ {
+ }
+
+ const std::string&
+ first () const
+ {
+ return first_;
+ }
+
+ const std::string&
+ last () const
+ {
+ return last_;
+ }
+
+ unsigned short
+ age () const
+ {
+ return age_;
+ }
+
+ void
+ age (unsigned short age)
+ {
+ age_ = age;
+ }
+
+private:
+ friend class odb::access;
+
+ person () {}
+
+ #pragma db id auto
+ unsigned long id_;
+
+ std::string first_;
+ std::string last_;
+ unsigned short age_;
+};
+
+#endif // PERSON_HXX