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Added migrate task to default rakefile (this is still a sqlite/mysql feature only, please do pitch in)

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Fixed Base.content_columns call for SQL Server adapter #1450 [DeLynn Berry] And a bug with the offset rules

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1647 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Added :prompt option to FormOptions#select (and the users of it, like FormOptions#select_country etc) to create "Please select" style descriptors #1181 [Michael Schuerig]

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Added JavascriptHelper#update_element_function, which returns a Javascript function (or expression) that'll update a DOM element according to the options passed #933 [mortonda@dgrmm.net]

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Fixed that has_and_belongs_to_many didn't respect single table inheritance types #1081 [Florian Weber]

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 mark merge point


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 base attribute_present? on blank?, accounting for zero


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 settle on the 'slow' MysqlAdapter#select since it means fewer comparisons later.  strip trailing whitespace.


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 remove duplicate conditional


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 oops, back out DELETE typo


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 minor perf tweaks + excise trailing whitespace


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 optimize method_missing for common case (read_attribute).  minor perf tweaks


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 don't include Benchmark into AbstractAdapter directly.  call Benchmark.realtime instead of bm = Benchmark.measure, bm.real


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 No longer pass superfluous connection to AbstractAdapter#log.


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 remove Column#primary for now


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 more minor perf tweaks


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 quoter required for column quoting


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 Rollback MysqlAdapter#select speedup; fix add_limit_offset


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 And take it out again.. passing around the quoter doesn't make sense any more because we're calling quote_column_name, not the generic quote method.


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