Class: Exwiw::QueryAstBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/exwiw/query_ast_builder.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(table_name, table_by_name, dump_target, logger) ⇒ QueryAstBuilder

Returns a new instance of QueryAstBuilder.



11
12
13
14
15
16
 
# File 'lib/exwiw/query_ast_builder.rb', line 11

def initialize(table_name, table_by_name, dump_target, logger)
  @table_name = table_name
  @table_by_name = table_by_name
  @dump_target = dump_target
  @logger = logger
end

Instance Attribute Details

#dump_target ⇒ Object (readonly)

Returns the value of attribute dump_target.



9
10
11
 
# File 'lib/exwiw/query_ast_builder.rb', line 9

def dump_target
  @dump_target
end

#table_by_name ⇒ Object (readonly)

Returns the value of attribute table_by_name.



9
10
11
 
# File 'lib/exwiw/query_ast_builder.rb', line 9

def table_by_name
  @table_by_name
end

#table_name ⇒ Object (readonly)

Returns the value of attribute table_name.



9
10
11
 
# File 'lib/exwiw/query_ast_builder.rb', line 9

def table_name
  @table_name
end

Class Method Details

.run(table_name, table_by_name, dump_target, logger) ⇒ Object 



5
6
7
 
# File 'lib/exwiw/query_ast_builder.rb', line 5

def self.run(table_name, table_by_name, dump_target, logger)
  new(table_name, table_by_name, dump_target, logger).run
end

Instance Method Details

#run ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'lib/exwiw/query_ast_builder.rb', line 18

def run
  table = table_by_name.fetch(table_name)

  where_clauses = build_where_clauses(table, dump_target)
  join_clauses = build_join_clauses(table, table_by_name, dump_target)

  QueryAst::Select.new.tap do |ast|
    ast.from(table.name)
    ast.select(table.columns)
    join_clauses.each { |join_clause| ast.join(join_clause) }
    where_clauses.each { |where_clause| ast.where(where_clause) }
  end
end