It is a free, online Diagram/UML tool provider and it does the job very well.
No download required.
How to use it? Just go on the website using any Webrowser (Firefox, Safari, Chrome, IE)and start drawing your diagram.
Want to save your diagram ? Once you're happy with your diagram, you can save it on your machine or on any cloud provider(Google Drive, DropBox, OneDrive).
Want to change something on a saved diagram? Just import it from your machine, your cloud provider or a URL and start your modifications.
Want to export it as png? pdf? xml? whatever? you can do that too in a sec.
我个人更喜欢使用Enterprise Architect或Visual Paradigm for UML来绘制图表。我发现 Visual Paradigm 在构建图表方面更加用户友好，但 EA 对于图表的实际呈现效果更好。
Well, Visio is the most omnipresent, and it does a fair job.
I personally prefer Enterprise Architect or Visual Paradigm for UML for my diagrams. I find Visual Paradigm more user-friendly in terms of building the diagrams, but EA better for the actual presentation of the diagrams.
If the diagram isn't too complicated or if the tiny details don't matter that much you could also use a whiteboard, imho that always works pretty good, especially if your face to face and you can walk them through the datamodel.
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我已经成功地使用了 dia，它成功了！ :)
I have used dia successfully and it does the job! :)
我会推荐 draw.io。
它是一个免费的在线图表/UML 工具提供商并且它的工作做得非常好。
无需下载。
如何使用？只需使用任何网络浏览器（Firefox、Safari、Chrome、IE）访问网站并开始绘制图表即可。
想要保存图表吗？对图表感到满意后，您可以将其保存在您的计算机或任何云提供商（Google Drive、DropBox、OneDrive）上。
想要更改已保存图表上的某些内容？只需从您的计算机、云提供商或 URL 导入它并开始修改即可。
想要将其导出为 png 格式吗？ pdf？ xml？什么？你也可以在一秒钟内做到这一点。
I would recommend draw.io.
It is a free, online Diagram/UML tool provider and it does the job very well.
No download required.
How to use it? Just go on the website using any Webrowser (Firefox, Safari, Chrome, IE)and start drawing your diagram.
Want to save your diagram ? Once you're happy with your diagram, you can save it on your machine or on any cloud provider(Google Drive, DropBox, OneDrive).
Want to change something on a saved diagram? Just import it from your machine, your cloud provider or a URL and start your modifications.
Want to export it as png? pdf? xml? whatever? you can do that too in a sec.
嗯，Visio 是最无所不在的，而且它的工作还算不错。
我个人更喜欢使用Enterprise Architect或Visual Paradigm for UML来绘制图表。我发现 Visual Paradigm 在构建图表方面更加用户友好，但 EA 对于图表的实际呈现效果更好。
Well, Visio is the most omnipresent, and it does a fair job.
I personally prefer Enterprise Architect or Visual Paradigm for UML for my diagrams. I find Visual Paradigm more user-friendly in terms of building the diagrams, but EA better for the actual presentation of the diagrams.
Microsoft Visio，如果您有（或可以获得）。如果没有，我使用过的一些替代方案包括 dia、Yed 和 InSight。
Microsoft Visio, if you have it (or can get it). If not, some alternatives I've worked with are dia, Yed, and InSight.
如果图表不是太复杂或者微小的细节并不那么重要，您也可以使用白板，恕我直言，它总是效果很好，特别是当您面对面并且可以引导他们完成数据模型时。
If the diagram isn't too complicated or if the tiny details don't matter that much you could also use a whiteboard, imho that always works pretty good, especially if your face to face and you can walk them through the datamodel.
还有一些在线选项可以进行图表绘制，例如 http://creately.com/。
There are also some online options to do diagramming, http://creately.com/ for instance.