111 lines
2.6 KiB
Plaintext
111 lines
2.6 KiB
Plaintext
note
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description: "Abstract class to handle a database connection"
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date: "$Date: 2014-08-20 15:21:15 -0300 (mi., 20 ago. 2014) $"
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revision: "$Revision: 95678 $"
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deferred class
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DATABASE_CONNECTION
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inherit
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DATABASE_CONFIG
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SHARED_ERROR
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feature {NONE} -- Initialization
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make_common
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-- Create a database handler with common settings.
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deferred
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ensure
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db_application_not_void: db_application /= Void
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db_control_not_void: db_control /= Void
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end
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make_basic ( a_database_name: STRING)
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-- Create a database handler with common settings and
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-- set database_name with `a_database_name'.
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require
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database_name_not_void: a_database_name /= Void
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database_name_not_empty: not a_database_name.is_empty
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deferred
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ensure
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db_application_not_void: db_application /= Void
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db_control_not_void: db_control /= Void
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end
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make (a_username: STRING; a_password: STRING; a_hostname: STRING; a_database_name: STRING; connection: BOOLEAN)
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-- Create a database handler with user `a_username', password `a_password',
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-- host `a_hostname', database_name `a_database_name', and keep_connection `connection'.
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require
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username_not_void: a_username /= Void
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username_not_empty: not a_username.is_empty
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password_not_void: a_password /= Void
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hostname_not_void: a_hostname /= Void
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hotname_not_empty: not a_hostname.is_empty
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database_name_not_void: a_database_name /= Void
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database_name_not_empty: not a_database_name.is_empty
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deferred
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ensure
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db_application_not_void: db_application /= Void
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db_control_not_void: db_control /= Void
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end
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login_with_connection_string (a_connection_string: STRING)
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-- Login with `a_connection_string'
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-- and immediately connect to database.
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deferred
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ensure
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db_application_not_void: db_application /= Void
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db_control_not_void: db_control /= Void
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end
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feature -- Database Setup
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db_application: DATABASE_APPL [DATABASE]
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-- Database application.
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db_control: DB_CONTROL
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-- Database control.
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keep_connection: BOOLEAN
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-- Keep connection alive?
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feature -- Change Element
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not_keep_connection
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do
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keep_connection := False
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end
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feature -- Conection
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connect
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-- Connect to the database.
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require else
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db_control_not_void: db_control /= Void
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do
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if not is_connected then
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db_control.connect
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end
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end
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disconnect
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-- Disconnect from the database.
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require else
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db_control_not_void: db_control /= Void
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do
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db_control.disconnect
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end
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is_connected: BOOLEAN
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-- True if connected to the database.
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require else
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db_control_not_void: db_control /= Void
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do
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Result := db_control.is_connected
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end
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end
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