Added a common database backend implementation.

Added sqlite (proof of concept)
2014-09-17 10:33:37 -03:00
parent fbb5c57b8f
commit 4227b82c7e
37 changed files with 1889 additions and 153 deletions
--- a/persistence/implementation/common/database/database_connection.e
+++ b/persistence/implementation/common/database/database_connection.e
@@ -0,0 +1,110 @@
+note
+	description: "Abstract class to handle a database connection"
+	date: "$Date: 2014-08-20 15:21:15 -0300 (mi., 20 ago. 2014) $"
+	revision: "$Revision: 95678 $"
+
+deferred class
+	DATABASE_CONNECTION
+
+inherit
+
+	DATABASE_CONFIG
+
+	SHARED_ERROR
+
+feature {NONE} -- Initialization
+
+	make_common
+			-- Create a database handler with common settings.
+		deferred
+		ensure
+			db_application_not_void: db_application /= Void
+			db_control_not_void: db_control /= Void
+		end
+
+	make_basic ( a_database_name: STRING)
+			-- Create a database handler with common settings and
+ 			-- set database_name with `a_database_name'.
+		require
+			database_name_not_void: a_database_name /= Void
+			database_name_not_empty: not a_database_name.is_empty
+		deferred
+		ensure
+			db_application_not_void: db_application /= Void
+			db_control_not_void: db_control /= Void
+		end
+
+	make (a_username: STRING; a_password: STRING; a_hostname: STRING; a_database_name: STRING; connection: BOOLEAN)
+
+			-- Create a database handler with user `a_username', password `a_password',
+			-- host `a_hostname', database_name `a_database_name', and keep_connection `connection'.
+		require
+			username_not_void: a_username /= Void
+			username_not_empty: not a_username.is_empty
+			password_not_void: a_password /= Void
+			hostname_not_void: a_hostname /= Void
+			hotname_not_empty: not a_hostname.is_empty
+			database_name_not_void: a_database_name /= Void
+			database_name_not_empty: not a_database_name.is_empty
+		deferred
+		ensure
+			db_application_not_void: db_application /= Void
+			db_control_not_void: db_control /= Void
+		end
+
+	login_with_connection_string (a_connection_string: STRING)
+			-- Login with `a_connection_string'
+			-- and immediately connect to database.
+		deferred
+		ensure
+			db_application_not_void: db_application /= Void
+			db_control_not_void: db_control /= Void
+		end
+
+feature -- Database Setup
+
+	db_application: DATABASE_APPL [DATABASE]
+			-- Database application.
+
+	db_control: DB_CONTROL
+			-- Database control.
+
+	keep_connection: BOOLEAN
+			-- Keep connection alive?
+
+feature -- Change Element
+
+	not_keep_connection
+		do
+			keep_connection := False
+		end
+
+feature -- Conection
+
+	connect
+			-- Connect to the database.
+		require else
+			db_control_not_void: db_control /= Void
+		do
+			if not is_connected then
+				db_control.connect
+			end
+		end
+
+	disconnect
+			-- Disconnect from the database.
+		require else
+			db_control_not_void: db_control /= Void
+		do
+			db_control.disconnect
+		end
+
+	is_connected: BOOLEAN
+			-- True if connected to the database.
+		require else
+			db_control_not_void: db_control /= Void
+		do
+			Result := db_control.is_connected
+		end
+
+end