Class: DB::Context::Session

Inherits:
Object
  • Object
show all
Defined in:
lib/db/context/session.rb

Overview

A connected context for sending queries and reading results.

Direct Known Subclasses

Transaction, Transient

Instance Method Summary collapse

Constructor Details

#initialize(pool, **options) ⇒ Session

Initialize the query context attached to the given connection pool.



14
15
16
17
 
# File 'lib/db/context/session.rb', line 14

def initialize(pool, **options)
  @pool = pool
  @connection = nil
end

Instance Method Details

#call(statement, **options) ⇒ Object

Send a query to the server.



54
55
56
57
58
59
60
61
62
63
64
 
# File 'lib/db/context/session.rb', line 54

def call(statement, **options)
  connection = self.connection
  
  connection.send_query(statement, **options)
  
  if block_given?
    yield connection
  elsif result = connection.next_result
    return Records.wrap(result)
  end
end

#clause(fragment = String.new) ⇒ Object 



48
49
50
 
# File 'lib/db/context/session.rb', line 48

def clause(fragment = String.new)
  Query.new(self, fragment)
end

#close ⇒ Object

Flush the connection and then return it to the connection pool.



29
30
31
32
33
34
 
# File 'lib/db/context/session.rb', line 29

def close
  if @connection
    @pool.release(@connection)
    @connection = nil
  end
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


36
37
38
 
# File 'lib/db/context/session.rb', line 36

def closed?
  @connection.nil?
end

#connection ⇒ Object

Lazy initialize underlying connection.



24
25
26
 
# File 'lib/db/context/session.rb', line 24

def connection
  @connection ||= @pool.acquire
end

#connection? ⇒ Boolean

Returns:

  • (Boolean) 


19
20
21
 
# File 'lib/db/context/session.rb', line 19

def connection?
  @connection != nil
end

#query(fragment = String.new, **parameters) ⇒ Object 



40
41
42
43
44
45
46
 
# File 'lib/db/context/session.rb', line 40

def query(fragment = String.new, **parameters)
  if parameters.empty?
    Query.new(self, fragment)
  else
    Query.new(self).interpolate(fragment, **parameters)
  end
end