是否可以从 Ruby 调用 MySQL 存储过程? [英] Is it possible to call a MySQL stored procedure from Ruby?

问题描述

当我尝试从 Rails 调用存储过程时，出现此异常:

ActiveRecord::StatementInvalid: Mysql::Error: PROCEDURE pipeline-ws_development.match_save_all 无法返回给定上下文中的结果集:调用 match_save_all()来自/Users/otto/Projects/Futures/src/pipeline-ws/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:150:in `log'来自/Users/otto/Projects/Futures/src/pipeline-ws/vendor/rails/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:281:in `execute'来自 (irb):3

Rails Wiki 中有一个页面讨论了 MySQL 的补丁解决此问题的适配器，但它已过时且似乎不再起作用.

配置代码正确启用存储过程，但仍然存在连接在存储过程调用后不同步的问题，并且新的 call_sp 方法不再起作用.

有关如何使其工作的任何建议?

这是我正在使用的代码:

ActiveRecord::Base.connection("调用storedproc()")

无论 storedproc() 是否返回任何结果，它都会抛出相同的异常.

解决方案

将过程包装在一个函数中是否可行?如果 Ruby 因没有返回行而导致呕吐(...无法在给定的上下文中返回结果集...)，这可能会解决它:

<前>分隔符 $创建过程 tProc()开始SET @a = '测试';结尾;$创建函数 tFunc()退货积分开始调用 tProc();返回 1；结尾;$分隔符；从 DUAL 中选择 tFunc()；>> 1从双重选择@a;>> '测试'

虽然，实际上，这不是一个非常可扩展的解决方案.

跟进:我在 Ruby/ActiveRecord 方面很不擅长，但这个例子绝对有效

<前>ActiveRecord::Base.establish_connection(authopts)类 TestClass

使用 CALL tProc() 会导致与您类似的错误.

When I try to call a stored procedure from Rails, I get this exception:

ActiveRecord::StatementInvalid: Mysql::Error: PROCEDURE pipeline-ws_development.match_save_all can't return a result set in the given context: call match_save_all()
    from /Users/otto/Projects/Futures/src/pipeline-ws/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:150:in `log'
    from /Users/otto/Projects/Futures/src/pipeline-ws/vendor/rails/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:281:in `execute'
    from (irb):3

There is a page in the Rails Wiki that discusses a patch for the MySQL adapter that resolves this issue, but it's out-of-date and doesn't seem to work anymore.

The configuration code enables stored procedures correctly, but it still has the issue with the connection getting out of sync after a stored procedure call and the new call_sp method doesn't work anymore.

Any suggestions for how to get this working?

This is the code I'm using:

ActiveRecord::Base.connection("call storedproc()")

It throws the same exception whether storedproc() returns any results or not.

解决方案

Would it work to wrap the procedure in a function? If Ruby's barfing due to no rows returned (...can't return a result set in the given context...), this may fix it:

DELIMITER $

CREATE PROCEDURE tProc()
BEGIN
    SET @a = 'test';
END;
$

CREATE FUNCTION tFunc()
RETURNS INT
BEGIN
    CALL tProc();
    RETURN 1;
END;
$

DELIMITER ;

SELECT tFunc() FROM DUAL;
>> 1

SELECT @a FROM DUAL;
>> 'test'

Although, realistically, this isn't a very extensible solution.

Followup: I'm pretty n00by at Ruby/ActiveRecord, but this example definitely works

ActiveRecord::Base.establish_connection(authopts)

class TestClass < ActiveRecord::Base
end

test_class = TestClass.new
puts %{#{test_class.connection.select_one('SELECT tFunc() AS tf FROM DUAL')}}
>> tf1

Using CALL tProc() resulted in an error similar to yours.

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