Class: Babik::Selection::Operation::Hour

Inherits:
DateOperation show all
Defined in:
lib/babik/queryset/lib/selection/operation/date.rb

Overview

Hour date operation

Constant Summary

Constants inherited from DateOperation

DateOperation::HAS_OPERATOR

Constants included from ValidDBMS

ValidDBMS::SUPPORTED_DB_ADAPTERS

Instance Attribute Summary

Attributes inherited from Base

#field, #sql_operation, #sql_operation_template, #value

Instance Method Summary collapse

Methods inherited from DateOperation

#initialize

Methods included from ValidDBMS

#assert_dbms

Methods inherited from Base

#_init_sql_operation, date_special_cases, #db_engine, escape, factory, #initialize, initialize_operation, initialize_operators, operator?, special_cases, #to_s

Constructor Details

This class inherits a constructor from Babik::Selection::Operation::DateOperation

Instance Method Details

#sql_function ⇒ Object

Raises:

  • (NotImplementedError) 


132
133
134
135
136
137
138
 
# File 'lib/babik/queryset/lib/selection/operation/date.rb', line 132

def sql_function
  dbms_adapter = db_engine
  return 'HOUR(#field)' if dbms_adapter == 'mysql2'
  return 'EXTRACT(HOUR FROM #field)' if dbms_adapter == 'postgresql'
  return 'CAST(strftime(\'%H\', #field) AS INTEGER)' if dbms_adapter == 'sqlite3'
  raise NotImplementedError, "#{self.class} lookup not implemented for #{dbms_adapter}"
end