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New db pragma qualifier: index. New tests: common/index, mysql/index,
pgsql/index.
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Conceptually, indexes belong to tables and some databases (MySQL, MSSQL)
indeed treat them as such (i.e., you can have indexes with the same name
in different tables).
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Too much effort to maintain.
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New pragma qualifier: namespace. New pragma specifier: schema. The table
specifier was extended to accept a schema prefix. New option: --default-
schema. The common/schema test was extended to cover the new functionality.
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We now first create the so-called database model from C++ model and
then use that to generate the database schema. The new approach also
adds more general support for primary/foreign keys, including multi-
column keys. Finally, for MySQL we now generate out-of-line foreign
key definitions. Because MySQL does not support deferred constraints
checking, deferred foreign keys are written commented out, for
documentation.
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A more generic name is required since it is now used in both generator
and processor (and in the future may be used validator).
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New pragma: default. New test: default.
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Now, instead of being specified as part of the SQL type with the type
pragma, there are separate null and not_null pragmas. The not_null
pragma was used to control NULL-ness of object pointers. Now the two
pragmas are used consistently for object pointers and simple values
(and in the future will work for composite values and containers).
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This is more vendor-neutral.
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The common part (in relational/) still has some MySQL-specific parts.
Also, add the notion of the current context which is used to avoid
explicitly passing the context object to every generator's c-tor.
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