vb.net create tiff image

vb.net create tiff image

vb.net create tiff image

vb.net create tiff image

vb.net create tiff image

vb.net create tiff image

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TIP You can pass an explicit status-code number to assert_response, such as assert_response(501) or its symbolic equivalent assert_response(:not_implemented). See http://iana.org/assignments/httpstatus-codes for the full list of codes and default messages you can use.

Earlier I said that Rails applications are generally database dependent. With this in mind, at this stage it s necessary to create a database for your application on your database server.

But since a single database server can service dozens of application servers without a hitch, using it as a centralized storage location for session data is a worthy compromise.

By default, your Rails application will use an SQLite database, and it will generate this for itself when you first run your database s migrations (covered later). If you are using any other database engine, however, the technique you ll use to create a database for your application will vary with database type and how you have your database server installed. In the sidebar Creating A Database with MySQL, I ve provided instructions for creating the database you need using MySQL s command-line client, but if you re using a different type of database (PostgreSQL, say), you must refer to the documentation and programs associated with your database system and look up how to create a database and a username and password login for that database on your system.

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The default file system session storage mechanism will just work with no configuration required. However, we feel that storing session data in the database is important enough that it s worth taking a brief detour to set up. Fortunately, Rails makes this an easy affair. There s a built-in Rake task called db:sessions:create that will make a migration to create the sessions table. To run it, enter the following from your application s directory on the command line:

You also want to assert that the proper template was rendered in response to the request, for which you use another of Rails custom assertions: assert_template. Here, you expect to see the index template (from app/views/articles/index.html.erb) to be rendered, so test this expectation: assert_template 'index' You need to do one more thing: assert that the correct instance variables were assigned. If you look at the articles controller, you see that you set an instance variable called @articles that contains the articles collection. Rails gives you the ability to test whether this assignment was successful by way of the assigns method: assert_not_nil assigns(:articles) This asserts that @articles was, in fact, assigned (by virtue of the fact that it shouldn t be nil). You can use this technique to test for the existence of any instance variable set within your controllers. Useful, isn t it Using assigns gives you access to the instance variable, so you can do with it asyou please.

If you are following the default route of using SQLite 3, you can ignore the Creating a Database with Tip MySQL sidebar.

Ch aPt er 13 W eB a P P L IC a tION Fr a MeW O r K S : r a I LS , S I N a t r a , a N D r a M a Z e

This will create a migration to create the necessary sessions table in the database. All we need to do is run it.

From the command-line MySQL client, it s quick and easy to create a database Here s an example session showing you how to create a database and associate it with a username and password for future access: ~/rails/mydiary $ mysql -u root -p Enter password: Welcome to the MySQL monitor Commands end with ; or \g Your MySQL connection id is 10 to server version: 5027-standard Type 'help;' or '\h' for help Type '\c' to clear the buffer mysql> CREATE DATABASE mydiary; Query OK, 1 row affected (008 sec) mysql> GRANT ALL PRIVILEGES ON mydiary* TO mydiary@localhost IDENTIFIED BY 'mypassword'; Query OK, 0 rows affected (030 sec) mysql> QUIT Bye In this session, you create a database called mydiary and then grant all the privileges to use that database to a user called mydiary with a password of mypassword.

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