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You can define collection types in a procedure, function, or package.
You can pass collection variables as parameters, to move data between client-side applications and stored subprograms.
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.
If the table you’re wanting to connect to contains any auto-incrementing columns, you must use the “SQL Query” option instead of simply choosing a table name from the “Table” option.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. If I remember correctly, we scheduled them on a Thursday night, and on Friday the DBAs were very careful to monitor the longest running queries for anything unexpected.
(Friday was picked because it was often just after a code release, and tended to be a fairly low traffic day.) When they saw a bad query they would find a better query plan and save that one so it wouldn't change again unexpectedly.It is a general concept that encompasses lists, arrays, and other familiar datatypes.