Class: Gitlab::Database::UnidirectionalCopyTrigger

Inherits:
Object
  • Object
show all
Defined in:
lib/gitlab/database/unidirectional_copy_trigger.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.on_table(table_name, connection:) ⇒ Object 



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# File 'lib/gitlab/database/unidirectional_copy_trigger.rb', line 6

def self.on_table(table_name, connection:)
  new(table_name, connection)
end

Instance Method Details

#create(from_column_names, to_column_names, trigger_name: nil) ⇒ Object 



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# File 'lib/gitlab/database/unidirectional_copy_trigger.rb', line 16

def create(from_column_names, to_column_names, trigger_name: nil)
  from_column_names, to_column_names = check_column_names!(from_column_names, to_column_names)
  trigger_name ||= unchecked_name(from_column_names, to_column_names)

  assignment_clauses = assignment_clauses_for_columns(from_column_names, to_column_names)

  connection.execute(<<~SQL)
    CREATE OR REPLACE FUNCTION #{trigger_name}()
    RETURNS trigger AS
    $BODY$
    BEGIN
      #{assignment_clauses};
      RETURN NEW;
    END;
    $BODY$
    LANGUAGE 'plpgsql'
    VOLATILE
  SQL

  connection.execute(<<~SQL)
    DROP TRIGGER IF EXISTS #{trigger_name}
    ON #{quoted_table_name}
  SQL

  connection.execute(<<~SQL)
    CREATE TRIGGER #{trigger_name}
    BEFORE INSERT OR UPDATE
    ON #{quoted_table_name}
    FOR EACH ROW
    EXECUTE FUNCTION #{trigger_name}()
  SQL
end

#drop(trigger_name) ⇒ Object 



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# File 'lib/gitlab/database/unidirectional_copy_trigger.rb', line 49

def drop(trigger_name)
  connection.execute("DROP TRIGGER IF EXISTS #{trigger_name} ON #{quoted_table_name}")
  connection.execute("DROP FUNCTION IF EXISTS #{trigger_name}()")
end

#name(from_column_names, to_column_names) ⇒ Object 



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# File 'lib/gitlab/database/unidirectional_copy_trigger.rb', line 10

def name(from_column_names, to_column_names)
  from_column_names, to_column_names = check_column_names!(from_column_names, to_column_names)

  unchecked_name(from_column_names, to_column_names)
end