Class: JDBCHelper::FunctionWrapper

Inherits:
ObjectWrapper show all
Defined in:
lib/jdbc-helper/wrapper/function_wrapper.rb

Overview

conn.function(:coalesce).call(nil, nil, ‘king’)

Instance Attribute Summary

Attributes inherited from ObjectWrapper

#connection, #name

Instance Method Summary collapse

Constructor Details

#initialize(conn, name) ⇒ FunctionWrapper

Returns a new instance of FunctionWrapper.



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# File 'lib/jdbc-helper/wrapper/function_wrapper.rb', line 14

def initialize conn, name
  super conn, name

  @suffix =
    case conn.driver
    when /oracle/
      " from dual"
    else
      ""
    end
end

Instance Method Details

#call(*args) ⇒ Object

Returns the result of the function call with the given parameters



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# File 'lib/jdbc-helper/wrapper/function_wrapper.rb', line 27

def call(*args)
  pstmt = @connection.prepare("select #{name}(#{args.map{'?'}.join ','})#{@suffix}")
  begin
    pstmt.query(*args).to_a[0][0]
  ensure
    pstmt.close
  end
end