Ruby 如何使用ActiveRecord调用没有参数的DB2存储过程？

我需要使用ActiveRecord调用一些遗留存储过程

我可以使用ActiveRecords调用没有参数或只有参数的过程

e、 g

或

上述方法非常有效。现在，当我需要调用一个没有参数的过程时，问题就出现了。我尝试了不同的方式呼叫SP，但无法使其正常工作

 ActiveRecord::Base.connection.execute("call legacy_proc_with_out_params('param1', 'param2', ?, ?)")

 ActiveRecord::Base.connection.execute("call legacy_proc_with_out_params('param1', 'param2', null, null)")

 ActiveRecord::Base.connection.execute("call legacy_proc_with_out_params('param1', 'param2', '', '')")

以上工作均无效（最后两个参数为OUT参数）。作为最后一个选项，如果真的不可能，我甚至可以跳过读取参数，只要我至少可以执行这个过程

编辑：添加错误详细信息以澄清“不工作”

编辑2：尝试了@Mustacio的建议（即通过

raw_connection

使用

prepare

方法，但是DB2适配器没有实现该方法。如果有其他途径可以在DB2中实现类似的方法，这肯定会解决问题

我还忘了提到我正在使用jRuby，因此，我正在使用用于DB2的jdbc适配器

 irb(main):049:0> ActiveRecord::ConnectionAdapters.constants.grep /DB2/
 => [:DB2Column, :DB2JdbcConnection]

 irb(main):050:0> ActiveRecord::Base.connection.raw_connection.methods.sort.grep /prep/
 => []

 irb(main):051:0>  ActiveRecord::Base.connection.raw_connection.prepare
 NoMethodError: undefined method `prepare' for #<ActiveRecord::ConnectionAdapters::DB2JdbcConnection:0xe6bc1cd0>
    from (irb):51:in `evaluate'
    from org/jruby/RubyKernel.java:1119:in `eval'
    from org/jruby/RubyKernel.java:1519:in `loop'
    from org/jruby/RubyKernel.java:1282:in `catch'
    from org/jruby/RubyKernel.java:1282:in `catch'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/console.rb:90:in `start'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/console.rb:9:in `start'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:69:in `console'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands.rb:17:in `(root)'
    from org/jruby/RubyKernel.java:1083:in `require'
    from bin/rails:4:in `(root)'

irb（main）：049:0>ActiveRecord:：ConnectionAdapters.constants.grep/DB2/
=>[：DB2Column，：DB2JdbcConnection]
irb（main）：050:0>ActiveRecord:：Base.connection.raw_connection.methods.sort.grep/prep/
=> []
irb（主）：051:0>ActiveRecord:：Base.connection.raw\u connection.prepare
NoMethodError：未定义的“准备”方法#
来自（irb）：51:in“evaluate”
来自org/jruby/RubyKernel.java:1119:in'eval'
来自org/jruby/RubyKernel.java:1519:in'loop'
来自org/jruby/RubyKernel.java:1282:in'catch'
来自org/jruby/RubyKernel.java:1282:in'catch'
from/home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/console.rb:90:in'start'
from/home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/console.rb:9:in'start'
from/home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/commands\u tasks.rb:69:在“控制台”中
from/home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/commands\u tasks.rb:40:in'run\u command！'
from/home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands.rb:17:in`（root）'
来自org/jruby/RubyKernel.java:1083:in'require'
从bin/rails:4:in`（root）'

我找到的解决方案是使用BEGIN-END块并声明伪变量来绑定OUT参数

举个例子：

ActiveRecord::Base.connection.execute("call legacy_proc_with_out_params('param1', 'param2', ?, ?)")

如果第一个OUT参数是INTEGER，第二个是SMALLINT，则完整调用如下所示：

 beginend_stmt = "BEGIN
                      DECLARE out_Param1 INTEGER;
                      DECLARE out_Param2 SMALLINT;

                      call legacy_proc_with_out_params('param1', 'param2', out_Param1, out_Param2);
                  END"

  ActiveRecord::Base.connection.execute beginend_stmt

---

定义“不工作”。@mustaccio错误详细信息已添加

 irb(main):049:0> ActiveRecord::ConnectionAdapters.constants.grep /DB2/
 => [:DB2Column, :DB2JdbcConnection]

 irb(main):050:0> ActiveRecord::Base.connection.raw_connection.methods.sort.grep /prep/
 => []

 irb(main):051:0>  ActiveRecord::Base.connection.raw_connection.prepare
 NoMethodError: undefined method `prepare' for #<ActiveRecord::ConnectionAdapters::DB2JdbcConnection:0xe6bc1cd0>
    from (irb):51:in `evaluate'
    from org/jruby/RubyKernel.java:1119:in `eval'
    from org/jruby/RubyKernel.java:1519:in `loop'
    from org/jruby/RubyKernel.java:1282:in `catch'
    from org/jruby/RubyKernel.java:1282:in `catch'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/console.rb:90:in `start'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/console.rb:9:in `start'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:69:in `console'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /home/srpec/.gem/gems/railties-4.1.8/lib/rails/commands.rb:17:in `(root)'
    from org/jruby/RubyKernel.java:1083:in `require'
    from bin/rails:4:in `(root)'

ActiveRecord::Base.connection.execute("call legacy_proc_with_out_params('param1', 'param2', ?, ?)")

 beginend_stmt = "BEGIN
                      DECLARE out_Param1 INTEGER;
                      DECLARE out_Param2 SMALLINT;

                      call legacy_proc_with_out_params('param1', 'param2', out_Param1, out_Param2);
                  END"

  ActiveRecord::Base.connection.execute beginend_stmt