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Sequel::Unbinder

Unbinder is used to take a dataset filter and return a modified version that unbinds already bound values and returns a dataset with bound value placeholders and a hash of bind values. You can then prepare the dataset and use the bound variables to execute it with the same values.

This class only does a limited form of unbinding where the variable names and values can be associated unambiguously. The only cases it handles are <tt>SQL::ComplexExpression<tt> with an operator in UNBIND_OPS, a first argument that's an instance of a member of UNBIND_KEY_CLASSES, and a second argument that's an instance of a member of UNBIND_VALUE_CLASSES.

So it can handle cases like:

DB.filter(:a=>1).exclude(:b=>2).where{c > 3}

But it cannot handle cases like:

DB.filter(:a + 1 < 0)

Constants

UNBIND_KEY_CLASSES

The key classes (first argument of the ComplexExpression) that will considered for transformation.

UNBIND_OPS

The <tt>SQL::ComplexExpression<tt> operates that will be considered for transformation.

UNBIND_VALUE_CLASSES

The value classes (second argument of the ComplexExpression) that will be considered for transformation.

Attributes

binds[R]

The hash of bind variables that were extracted from the dataset filter.

Public Class Methods

new() click to toggle source

Intialize an empty binds hash.

# File lib/sequel/ast_transformer.rb, line 150
def initialize
  @binds = {}
end

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