On Saturday 14 June 2008 06:28:58 Russell Warren wrote: > > if you'd like to specify a value generator for the columns, just > > use a ColumnDefault. Whatever function or SQL you like will be > > called if no value is present - its just in this case we can't > > rely upon SQLite's OID generation. > > Thanks - I'll look into that. I just have to figure out how to > make ColumnDefault dialect dependent. > > > I wouldn't favor a built in system of "guessing" within the > > sqlite dialect how to autoincrement a composite PK field without > > explicit user intervention. > > Why not? Is it really guessing when the table has been defined > precisely within SQLA? If you have a Column that has been defined > to be an Integer primary key that is supposed to autoincrement, and > you are using sqlite... how could you be wrong? The worst case I > can think of is if sqlite changes in the future to actually support > it, in which case you'd either change the dialect or get an error. > No? maybe the user should request it somehow. Here come extra dialect-preferences. e.g. Column may mantain an attribute extras4sqlite, eventualy containing a dict of sqlite-specific settings; same for postgres etc. Then the specific dialect can look the column and get his own extra-settings - if any. This gives explicitness, separation of concerns (generic vs specific), and flexibility together. And this can be applied to other objects, e.g. tables or whatever. i'm sure thre are things u can do with tables in postgress and u cannot do in sqlite. Once some feature/attribute is considered generic/unified, it is moved from those extra* settings into the usual place -- or vice versa if stops being generic.
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