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hapter 5 explains the basics of defining models, and we use them throughout the rest of the book. There is, however, a huge range of model options available not covered elsewhere. This appendix explains each possible model definition option. Note that although these APIs are considered very stable, the Django developers consistently add new shortcuts and conveniences to the model definition. It s a good idea to always check the latest documentation online at http://www.djangoproject.com/documentation/0.96/ model-api/.

command.Prepare()

Caution In general, you should not modify the dictionary returned by vars because, according to the official



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The most important part of a model and the only required part of a model is the list of database fields it defines.

and it can be executed any time after the parameters have been added to the command and before the command is executed. Prepare() avoids SQL parsing overhead. The query or statement associated with the command is parsed only on first execution. After that, the cached SQL is executed, changing only parameter values. You never have to prepare any commands, but it s always the best practice to do this if you expect to execute a command multiple times.





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Django places only two restrictions on model field names: A field name cannot be a Python reserved word, because that would result in a Python syntax error, for example: class Example(models.Model): pass = models.IntegerField() # 'pass' is a reserved word! A field name cannot contain more than one underscore in a row, due to the way Django s query lookup syntax works, for example: class Example(models.Model): foo__bar = models.IntegerField() # 'foo__bar' has two underscores! These limitations can be worked around, though, because your field name doesn t necessarily have to match your database column name. See the upcoming db_column section. SQL reserved words, such as join, where, and select, are allowed as model field names, because Django escapes all database table names and column names in every underlying SQL query. It uses the quoting syntax of your particular database engine.

again to gain the advantage of prepared SQL. Only parameter values can change between command executions, for a command to stay prepared.

Python documentation, the result is undefined. In other words, you might not get the result you re after.

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Each field in your model should be an instance of the appropriate Field class. Django uses the field class types to determine a few things: The database column type (e.g., INTEGER, VARCHAR) The widget to use in Django s admin interface, if you care to use it (e.g., <input type="text">, <select>) The minimal validation requirements, which are used in Django s admin interface A complete list of field classes follows, sorted alphabetically. Note that relationship fields (ForeignKey, etc.) are handled in the next section.

You can use Prepare() even if you only execute a command once, but it s a waste of your time and the computer s. For example, you could change Module1.vb as follows:

' Execute nonquery to insert an employee cmdnon.Parameters("@fname").Value = fname cmdnon.Parameters("@lname").Value = lname Console.WriteLine( _ "Executing statement " & cmdnon.CommandText) cmdnon.ExecuteNonQuery()

An IntegerField that automatically increments according to available IDs. You usually won t need to use this directly; a primary key field will automatically be added to your model if you don t specify otherwise.

cmdnon.Prepare() cmdnon.ExecuteNonQuery() Console.WriteLine( _ "After INSERT: Number of employees = " & cmdqry.ExecuteScalar())

This sort of invisible dictionary is called a namespace or scope. So, how many namespaces are there In addition to the global scope, each function call creates a new one: >>> ... >>> >>> >>> 1 def foo(): x = 42 x = 1 foo() x

A string field, for small- to large-sized strings. For large amounts of text, use TextField. CharField has an extra required argument, maxlength, which is the maximum length (in characters) of the field. This maximum length is enforced at the database level and in Django s validation.

and it would still run as expected, but now you ve added an unnecessary call to Prepare(). Further, the prepared command is discarded when you change the CommandText before performing the DELETE:

A date field. DateField has a few extra optional arguments, as shown in Table B-1. Table B-1. Extra DateField Options

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