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This example shows how to persist objects that use Qt smart pointers,
containers, and value types with the help of the Qt profile library
(libodb-qt).
The example consists of the following files:
person.hxx
Describe contents.
person-odb.hxx
person-odb.ixx
person-odb.cxx
person.sql
The first three files contain the database support code and the last file
contains the database schema for the employee.hxx header.
These files are generated by the ODB compiler from employee.hxx using the
following command line:
odb -d <database> -p qt --generate-schema --generate-query employee.hxx
Where <database> stands for the database system we are using, for example,
'mysql'.
The -p option is used to instruct the ODB compiler to load the Qt
profile.
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 employee.hxx and employee-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 creates a number of 'employee' and 'employer' objects and
persists them in the database. The next transaction loads all the employees
of a particular employer using the employee-employer relationship. Finally,
the driver performs a database query which uses a data member of the Boost
gregorian::date type in its criterion.
To run the example we first need to create the database schema. Using MySQL
as an example, this can be achieved with the following command:
mysql --user=odb_test --database=odb_test < employee.sql
Here we use 'odb_test' as the database login and also 'odb_test' as the
database name.
Once the database schema is ready, we can run the example (using MySQL as
the database):
./driver --user odb_test --database odb_test
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