如何通过单击视图中的按钮来调用rails中的PLSQL函数?

时间:2016-05-19 10:18:37

标签: javascript ruby-on-rails ruby ajax plsql

我在Rails中遇到了一个问题,我无法解决。我几乎是初学者,但我必须解决以下问题:

我需要在现有的rails web应用程序中构建一种仪表板页面。 此仪表板页面应该能够通过提供2个日期并单击按钮从Oracle服务器启动PLSQL过程。

我尝试使用ruby-plsql中的rails console gem,我能够成功调用所需的Oracle存储过程。

我想创建一个带有表单的视图来接受存储过程的日期字段,然后在用户单击提交按钮时执行存储过程。应在提交时启动ruby-plsql方法。我还需要确保在当前过程正在运行时,可能通过灰显“提交”按钮再次启动已经运行的过程。

如何开发?

1 个答案:

答案 0 :(得分:0)

ruby-plsql和'haml'宝石添加到Gemfile

gem 'ruby-plsql'
gem 'haml'

接下来,您可以使用Rails生成器来控制控制器和支持组件:

rails generate controller procedure execute

config/routes中,将get路由更新为post路由:

get 'procedure.execute'
post 'procedure/execute'

您可以制作一个简单的视图(此示例使用HAML)。将此代码添加到文件app/views/procedure/execute.html.haml

%div
  %p#notice
    = "A stored procedure is currently running.  Please wait..." if @is_running

%div
  = field_set_tag "Procedure 1" do
    = form_tag procedure_execute_path, id: "form1" do
      = hidden_field_tag "proc", "stored_proc_1"
      = text_field_tag "date1", nil
      = text_field_tag "date2", nil
      = submit_tag "Execute", disabled: @is_running

%div
  = field_set_tag "Procedure 2" do
    = form_tag procedure_execute_path, id: "form2" do
      = hidden_field_tag "proc", "stored_proc_2"
      = text_field_tag "string1", nil
      = text_field_tag "number1", nil
      = submit_tag "Execute", disabled: @is_running

%div#results
  = @results if @results

%script
  $(document).on("ready", register_ajax);
  $(document).on("page:change", register_ajax);

确保将jQuery和Unobtrusive Javascript支持添加到/app/assets/javascripts/application.js

//= require jquery
//= require jquery_ujs

确认您的config/application.rb在“应用”类中包含此行:

config.assets.enable = true

请注意,表单现在确定将调用哪个方法,并且它们都将具有不同参数的请求发送到相同的execute操作。

可以将异步提交表单并处理结果的Ajax代码添加到/app/assets/javascripts/procedure.js文件中:

var ajax_registered = false;

function register_ajax() {
    if (ajax_registered) {
      return;
    }

    $('#form1 input[type="submit"], #form2 input[type="submit"]').click(function () {
        // First, disable all of the form buttons and put up a "running" notice
        $('form input[type="submit"]').prop("disabled", "disabled");
        $("#notice").text("A stored procedure is currently running.  Please wait...")

        var data = $(this).parent().serialize();

        // Submit the Ajax POST
        var jqxhr = $.post("/procedure/execute", data, function(data, status, xhr) {
            // Success: display the results in the #results div
            $("#results").text(data);
        }, "text")
        .fail(function(data, status, xhr) {
            // Notify the user that an error has occurred
            alert("An error has occured with the stored procedure");
        })
        .always(function(data, status, xhr) {
            // Always re-enable the submit buttons after completion
            $('form input[type="submit"]').prop("disabled", "");
            $("#notice").text("");
        });
    });

    ajax_registered = true;
};

接下来,在execute中实施ProcedureController操作,该操作应位于app/controllers/procedure_controller.rb

class ProcedureController < ApplicationController
  @@running = false

  def execute
    if request.post?
      plsql.connection = OCI8.new("hr","hr","xe")
      notice = nil
      if @@running
        notice = "A stored procedure is currently running.  Try again later"
      else
        @@running = true
        proc_params = execute_params
        proc = proc_params.delete(:proc)
        case proc
        when "stored_proc_1"
          @results = plsql.my_stored_proc(proc_params)
        when "stored_proc_2"
          @results = plsql.my_other_stored_proc(proc_params)
        end
        @@running = false
      end
      if request.xhr?
        render text: @results.to_json and return
      else
        @is_running = @@running
        redirect_to procedure_execute_path, notice: notice
      end
    else
      @is_running = @@running
    end
  end

private

  def execute_params
    params.permit(:utf8, :authenticity_token, :proc, :date1, :date2, :string1, :number1)
  end
end

execute操作同步运行,但也使用@@ running标志指示它当前正在处理请求,以防在当前正在运行的proc完成之前另一个从仪表板进入。表单中的proc隐藏字段用于指示要执行的存储过程,并根据选择的控制器进行调度。

如果请求来自Ajax调用,则响应将是一个JSON对象,其中包含存储过程调用的结果;否则,页面将完全呈现,结果将被包含在内。

这应该足够了。它不漂亮,但结构就在那里,您可以改进execute方法来做其他事情,并根据自己的喜好设计视图样式。