class Sequel::Dataset::PlaceholderLiteralizer::Recorder
Records the offsets at which the placeholder arguments are used in the SQL query.
Public Instance Methods
arg(v=(no_arg_given = true; @argn+=1))
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Return an Argument with the specified position, or the next position. In general you shouldn't mix calls with an argument and calls without an argument for the same receiver.
# File lib/sequel/dataset/placeholder_literalizer.rb, line 102 def arg(v=(no_arg_given = true; @argn+=1)) unless no_arg_given @argn = v if @argn < v end Argument.new(self, v) end
loader(dataset) { |self, dataset| ... }
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Yields the receiver and the dataset to the block, which should call arg on the receiver for each placeholder argument, and return the dataset that you want to load.
# File lib/sequel/dataset/placeholder_literalizer.rb, line 80 def loader(dataset) @argn = -1 @args = [] ds = yield self, dataset sql = ds.clone(:placeholder_literalizer=>self).sql last_offset = 0 fragments = @args.map do |used_sql, offset, arg, t| raise Error, "placeholder literalizer argument literalized into different string than dataset returned" unless used_sql.equal?(sql) a = [sql[last_offset...offset], arg, t] last_offset = offset a end final_sql = sql[last_offset..-1] arity = @argn+1 PlaceholderLiteralizer.new(ds.clone, fragments, final_sql, arity) end
use(sql, arg, transformer)
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Record the offset at which the argument is used in the SQL query, and any transforming
# File lib/sequel/dataset/placeholder_literalizer.rb, line 111 def use(sql, arg, transformer) @args << [sql, sql.length, arg, transformer] end