From 8e29be9f2229a6c618f95b725502f7082f02d50a Mon Sep 17 00:00:00 2001 From: Constantin Michael Date: Tue, 22 Mar 2011 10:49:56 +0200 Subject: Add Qt profile example --- qt/README | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 qt/README (limited to 'qt/README') diff --git a/qt/README b/qt/README new file mode 100644 index 0000000..4e94255 --- /dev/null +++ b/qt/README @@ -0,0 +1,56 @@ +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: + +employee.hxx + Describe contents. + +employee-odb.hxx +employee-odb.ixx +employee-odb.cxx +employee.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 -p qt --generate-schema --generate-query employee.hxx + + Where 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 -- cgit v1.1