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If you assign auto-primary-key values manually, make sure not to use an already existing primary key value! If you create a new object with an explicit primary key value that already exists in the database, Django will assume you re changing the existing record rather than creating a new one. Given the preceding 'Cheddar Talk' blog example, this example would override the previous record in the database: >>> b4 = Blog(id=3, name='Not Cheddar', tagline='Anything but cheese.') >>> b4.save() # Overrides the previous blog with ID=3! Explicitly specifying auto-primary-key values is mostly useful for bulk-saving objects, when you re confident you won t have primary key collision.



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' Create dataset Dim ds As DataSet = New DataSet()





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'Sir Lancelot' This means that you have to worry about the contents of globalName when you use instances (objects) of the class OpenObject. In fact, you have to make sure that nobody changes it: >>> globalName = 'Sir Gumby' >>> o.getName() 'Sir Gumby' Things get even more problematic if you try to create more than one OpenObject because they will all be messing with the same variable: >>> o1 = OpenObject() >>> o2 = OpenObject() >>> o1.setName('Robin Hood') >>> o2.getName() 'Robin Hood' As you can see, setting the name of one automatically sets the name of the other. Not exactly what you want. Basically, you want to treat objects as abstract. When you call a method you don t want to worry about anything else, such as not disturbing global variables. So how can you encapsulate the name within the object No problem. You make it an attribute. Attributes are variables that are a part of the object, just like methods; actually methods are almost like attributes bound to functions. (You ll see an important difference between methods and functions in the section Attributes, Functions, and Methods, later in this chapter.) If you rewrite the class to use an attribute instead of a global variable, and you rename it ClosedObject, it works like this: >>> c = ClosedObject() >>> c.setName('Sir Lancelot') >>> c.getName() 'Sir Lancelot' So far, so good. But for all you know, this could still be stored in a global variable. Let s make another object: >>> r = ClosedObject() >>> r.setName('Sir Robin') r.getName() 'Sir Robin' Here we can see that the new object has its name set properly. Well, we expected that. But what has happened to the first object now >>> c.getName() 'Sir Lancelot'

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To save changes to an object that s already in the database, use save(). Given a Blog instance b5 that has already been saved to the database, this example changes its name and updates its record in the database: >>> b5.name = 'New name' >>> b5.save() This performs an UPDATE SQL statement behind the scenes. Again, Django doesn t hit the database until you explicitly call save().

At this stage, all you had was an empty dataset. The key line is where you used the Fill method on the data adapter to execute the query, retrieve the data, and populate the dataset:

' Fill dataset da.Fill(ds, "products")

You may have noticed that Django database objects use the same save() method for creating and changing objects. Django abstracts the need to use INSERT or UPDATE SQL statements. Specifically, when you call save(), Django follows this algorithm: If the object s primary key attribute is set to a value that evaluates to True (i.e., a value other than None or the empty string), Django executes a SELECT query to determine whether a record with the given primary key already exists. If the record with the given primary key does already exist, Django executes an UPDATE query. If the object s primary key attribute is not set, or if it s set but a record doesn t exist, Django executes an INSERT. Because of this, you should be careful not to specify a primary key value explicitly when saving new objects if you cannot guarantee the primary key value is unused.

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