class SQLite3::Database::FunctionProxy
A helper class for dealing with custom functions (see create_function, create_aggregate, and create_aggregate_handler). It encapsulates the opaque function object that represents the current invocation. It also provides more convenient access to the API functions that operate on the function object.
This class will almost always be instantiated indirectly, by working with the create methods mentioned above.
Attributes
Public Class Methods
Create a new FunctionProxy
that encapsulates the given func
object. If context is non-nil, the functions context will be set to that. If it is non-nil, it must quack like a Hash. If it is nil, then none of the context functions will be available.
# File lib/sqlite3/database.rb, line 63 def initialize @result = nil @context = {} end
# File lib/sqlite3/database.rb, line 50 def self.proxy(handler) proc do |*args| fp = new args.unshift(fp) handler.call(*args) fp.result end end
Public Instance Methods
Returns the value with the given key from the context. This is only available to aggregate functions.
# File lib/sqlite3/database.rb, line 70 def []( key ) @context[ key ] end
Sets the value with the given key in the context. This is only available to aggregate functions.
# File lib/sqlite3/database.rb, line 76 def []=( key, value ) @context[ key ] = value end