Class: SQLTree::Node::TableReference

Inherits:
Base
  • Object
show all
Defined in:
lib/sql_tree/node/table_reference.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

[], #inspect, #quote_str, #quote_var

Constructor Details

#initialize(table, table_alias = nil) ⇒ TableReference

Returns a new instance of TableReference.



7
8
9
 
# File 'lib/sql_tree/node/table_reference.rb', line 7

def initialize(table, table_alias = nil)
  @table, @table_alias = table, table_alias
end

Instance Attribute Details

#table ⇒ Object

Returns the value of attribute table.



5
6
7
 
# File 'lib/sql_tree/node/table_reference.rb', line 5

def table
  @table
end

#table_alias ⇒ Object

Returns the value of attribute table_alias.



5
6
7
 
# File 'lib/sql_tree/node/table_reference.rb', line 5

def table_alias
  @table_alias
end

Class Method Details

.parse(tokens) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/sql_tree/node/table_reference.rb', line 21

def self.parse(tokens)
  if SQLTree::Token::Variable === tokens.next
    table_reference = self.new(tokens.current.literal)
    if tokens.peek == SQLTree::Token::AS || SQLTree::Token::Variable === tokens.peek
      tokens.consume(SQLTree::Token::AS) if tokens.peek == SQLTree::Token::AS
      table_reference.table_alias = SQLTree::Node::Variable.parse(tokens).name
    end
    return table_reference
  else
    raise SQLTree::Parser::UnexpectedToken.new(tokens.current)
  end
end

Instance Method Details

#==(other) ⇒ Object 



17
18
19
 
# File 'lib/sql_tree/node/table_reference.rb', line 17

def ==(other)
  other.table = self.table && other.table_alias == self.table_alias
end

#to_sql ⇒ Object 



11
12
13
14
15
 
# File 'lib/sql_tree/node/table_reference.rb', line 11

def to_sql
  sql = quote_var(table)
  sql << " AS " << quote_var(table_alias) if table_alias
  return sql
end