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)) click to toggle source

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
102 def arg(v=(no_arg_given = true; @argn+=1))
103   unless no_arg_given
104     @argn = v if @argn < v
105   end
106   Argument.new(self, v)
107 end
loader(dataset) { |self, dataset| ... } click to toggle source

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
80 def loader(dataset)
81   @argn = -1
82   @args = []
83   ds = yield self, dataset
84   sql = ds.clone(:placeholder_literalizer=>self).sql
85 
86   last_offset = 0
87   fragments = @args.map do |used_sql, offset, arg, t|
88     raise Error, "placeholder literalizer argument literalized into different string than dataset returned" unless used_sql.equal?(sql)
89     a = [sql[last_offset...offset], arg, t]
90     last_offset = offset
91     a
92   end
93   final_sql = sql[last_offset..-1]
94 
95   arity = @argn+1
96   PlaceholderLiteralizer.new(ds.clone, fragments, final_sql, arity)
97 end
use(sql, arg, transformer) click to toggle source

Record the offset at which the argument is used in the SQL query, and any transforming block.

    # File lib/sequel/dataset/placeholder_literalizer.rb
111 def use(sql, arg, transformer)
112   @args << [sql, sql.length, arg, transformer]
113 end