Class: Flounder::Expression::Expr

Inherits:
Object
  • Object
show all
Includes:
SymbolExtensions
Defined in:
lib/flounder/expression.rb

Direct Known Subclasses

BinaryOp, Cast, ConditionBit, FunCall, Named

Instance Method Summary collapse

Constructor Details

#initialize(domain) ⇒ Expr

Returns a new instance of Expr.



4
5
6
 
# File 'lib/flounder/expression.rb', line 4

def initialize domain
  @domain = domain
end

Instance Method Details

#&(expr) ⇒ Object 



17
18
19
 
# File 'lib/flounder/expression.rb', line 17

def & expr
  BinaryOp.new(@domain, 'AND', self, expr)
end

#as(name) ⇒ Object 



8
9
10
 
# File 'lib/flounder/expression.rb', line 8

def as name
  Named.new(@domain, name, self)
end

#cast(type) ⇒ Object 



11
12
13
 
# File 'lib/flounder/expression.rb', line 11

def cast type
  Cast.new(@domain, type, self)
end

#db_quote(something) ⇒ Object 



36
37
38
39
40
 
# File 'lib/flounder/expression.rb', line 36

def db_quote something
  @domain.with_connection do |conn|
    conn.quote(something)
  end
end

#eval(argument) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
# File 'lib/flounder/expression.rb', line 21

def eval argument
  case argument
    when String, Symbol
      db_quote(argument.to_s)
    when Fixnum
      argument
    when Expr
      argument.to_sql
    when Flounder::Field
      argument.fully_qualified_name
  else 
    db_quote(argument)
  end
end

#to_immediate ⇒ Object 



45
46
47
 
# File 'lib/flounder/expression.rb', line 45

def to_immediate
  Flounder::Immediate.new(to_sql)
end

#to_sql ⇒ Object

Raises:

  • (NotImplementedError) 


42
43
44
 
# File 'lib/flounder/expression.rb', line 42

def to_sql
  raise NotImplementedError
end

#|(expr) ⇒ Object 



14
15
16
 
# File 'lib/flounder/expression.rb', line 14

def | expr
  BinaryOp.new(@domain, 'OR', self, expr)
end