aboutsummaryrefslogtreecommitdiff
path: root/query/README
diff options
context:
space:
mode:
Diffstat (limited to 'query/README')
-rw-r--r--query/README50
1 files changed, 50 insertions, 0 deletions
diff --git a/query/README b/query/README
new file mode 100644
index 0000000..6f6a858
--- /dev/null
+++ b/query/README
@@ -0,0 +1,50 @@
+This examples shows how to use the ODB Query Language to search the database
+for persistent objects matching certain criteria.
+
+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
+person.sql
+ The first three files contain the database support code and the last file
+ contains the database schema for the person.hxx header.
+
+ These files are generated by the ODB compiler from person.hxx using the
+ following command line:
+
+ odb -d <database> --generate-query --generate-schema person.hxx
+
+ Where <database> stands for the database system we are using, for example,
+ 'mysql'.
+
+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 'person' class and the database support
+ code for this class. 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 persists a number of 'person' objects in the database
+ and executes a number of queries to find objects matching various criteria.
+
+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 < person.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
+