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In response to Lala and malik’s questions on connecting a form to a database (whether it’s Microsoft Access, My SQL, etc.doesn’t really matter), I decided to write a little tutorial on how to do it.To use any other database back-end, run from the source distribution and install the appropriate driver for the required back end. For example: because it is an instance of a Uniform Resource Identifier.The DAL allows multiple connections with the same database or with different databases, even databases of different types.web2py comes with a Database Abstraction Layer (DAL), an API that maps Python objects into database objects such as queries, tables, and records.The DAL dynamically generates the SQL in real time using the specified dialect for the database back end, so that you do not have to write SQL code or learn different SQL dialects (the term SQL is used generically), and the application will be portable among different types of databases.Google No SQL is treated as a particular case in Chapter 13.

The second thing you need to do is create a data connection in Designer: From a new or existing form, open the Data View palette (you can use the “Window | Data View” menu item to open it) and choose “New Data Connection” from the palette’s fly-out menu.Ambrose Bierce Many programming techniques use collection types such as arrays, bags, lists, nested tables, sets, and trees.To support these techniques in database applications, PL/SQL provides the datatypes , which allow you to declare index-by tables, nested tables and variable-size arrays.But if they ran statistics regularly, used the monitoring tools as they are supposed to, and fixed issues as they came up then they would have fewer headaches, and they wouldn't encounter them all at once. If a table goes from 1 row to 200 rows, that's a significant change.When a table goes from 100,000 rows to 150,000 rows, that's not a terribly significant change.