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我想添加一些觸發器到我的PostgreSQL(v 9)數據庫,我想創建一個Rails遷移(使用v 4.2.7)來滿足這個目標。所以,我創建了一個遷移與此內容如何在Rails遷移中創建觸發器?
class CreateDeleteAddressTriggers < ActiveRecord::Migration
def change
execute <<-SQL
CREATE OR REPLACE FUNCTION remove_address() RETURNS trigger
LANGUAGE plpgsql AS
$$BEGIN
DELETE FROM public.addresses WHERE id = OLD.address_id;
END;$$;
CREATE TRIGGER remove_my_object_address
AFTER DELETE ON public.my_objects FOR EACH ROW
EXECUTE TRIGGER remove_address()
CREATE TRIGGER remove_user_address
AFTER DELETE ON public.users FOR EACH ROW
EXECUTE TRIGGER remove_address()
SQL
end
end
不幸的是,當我運行「耙分貝:遷移」的任務,我得到以下錯誤
davea$ rake db:migrate
== 20160928184431 CreateDeleteAddressTriggers: migrating ======================
-- execute(" CREATE OR REPLACE FUNCTION remove_address() RETURNS trigger\n LANGUAGE plpgsql AS\n $$BEGIN\n DELETE FROM public.addresses WHERE id = OLD.address_id;\n END;$$;\n\n CREATE TRIGGER remove_my_object_address\n AFTER DELETE ON public.my_objects FOR EACH ROW\n EXECUTE TRIGGER remove_address()\n\n CREATE TRIGGER remove_user_address\n AFTER DELETE ON public.users FOR EACH ROW\n EXECUTE TRIGGER remove_address()\n")
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:
PG::SyntaxError: ERROR: syntax error at or near "TRIGGER"
LINE 9: EXECUTE TRIGGER remove_address()
^
: CREATE OR REPLACE FUNCTION remove_address() RETURNS trigger
LANGUAGE plpgsql AS
$$BEGIN
DELETE FROM public.addresses WHERE id = OLD.address_id;
END;$$;
CREATE TRIGGER remove_my_object_address
AFTER DELETE ON public.my_objects FOR EACH ROW
EXECUTE TRIGGER remove_address()
CREATE TRIGGER remove_user_address
AFTER DELETE ON public.users FOR EACH ROW
EXECUTE TRIGGER remove_address()
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `async_exec'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:155:in `block in execute'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/abstract_adapter.rb:484:in `block in log'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.7.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/abstract_adapter.rb:478:in `log'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:154:in `execute'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/migration.rb:665:in `block in method_missing'
/Users/davea/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.7.1/lib/active_record/migration.rb:634:in `block in say_with_time'
我怎樣才能更正我的移民才能運行觸發器是否正確?
編輯:針對給出的答案,這是你使用了錯誤的語法在SQL生成的錯誤...
ActiveRecord::StatementInvalid: PG::SyntaxError: ERROR: syntax error at or near "CREATE"
LINE 11: CREATE TRIGGER remove_user_address
我用「EXECUTE PROCEDURE」替換了「EXECUTE TRIGGER」,但在運行我的遷移時遇到了此錯誤,「PG :: SyntaxError:ERROR:語法錯誤處於或接近」CREATE「,第11行:CREATE TRIGGER remove_user_address」 – Dave
@Dave每個語句後都需要分號。 – meagar
@meagar這種處理函數和觸發器遷移的方式不會在測試env遷移中執行代碼。有什麼建議麼? – carbonr