Class: SQLite3::Database::FunctionProxy

Inherits:

Object

• Object
• SQLite3::Database::FunctionProxy

Defined in:

lib/sqlite3/database.rb

Overview

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.

Instance Attribute Summary

• #result ⇒ Object

  Returns the value of attribute result.

Instance Method Summary

• #[](key) ⇒ Object

  Returns the value with the given key from the context.

• #[]=(key, value) ⇒ Object

  Sets the value with the given key in the context.

• #initialize ⇒ FunctionProxy constructor

  Create a new FunctionProxy that encapsulates the given func object.

Constructor Details

#initialize ⇒ FunctionProxy

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 672

def initialize
  @result = nil
  @context = {}
end

Instance Attribute Details

#result ⇒ Object

Returns the value of attribute result.

# File 'lib/sqlite3/database.rb', line 666

def result
  @result
end

Instance Method Details

#[](key) ⇒ Object

Returns the value with the given key from the context. This is only available to aggregate functions.

# File 'lib/sqlite3/database.rb', line 679

def [](key)
  @context[key]
end

#[]=(key, value) ⇒ Object

Sets the value with the given key in the context. This is only available to aggregate functions.

# File 'lib/sqlite3/database.rb', line 685

def []=(key, value)
  @context[key] = value
end