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连接网络型 Excel 数据源

功能概述

Wyn 支持网络型 Excel 数据源，并且支持使用 URL 参数进行数据过滤。

连接数据源

1. 在系统的门户网站中单击，选择数据源。

2. 在左侧数据源列表或者在右侧图标视图中选择文件型数据源 Excel。

type=info
提示
如未见数据源的连接入口，需请管理员到后台管理的数据源管理中勾选该数据源，仅勾选的数据源可以使用。更多介绍，请见数据源管理。

3. 填写配置信息，并单击右下角的创建。

参数	说明
名称	自定义数据源的名称。
源类型	可选择为本地和网络两种类型。连接网络型Excel数据源时需选择网络。
数据源	输入源的地址，一般是一个 URL 地址；
请求方法	根据服务端的设定选择使用 GET 或 POST 的请求方法。
参数	使用参数进行数据过滤，使用方法请见本页下方关于参数的介绍。
认证模式	认证模式：可选择None、Basic 和 OAuth2。 - - 当认证模式为 Basic 时，您需要设置用户名和密码。 - 当认证模式为 OAuth2 时，您需要设置 TokenEndpoint、ClientID、ClientSecret、用户名和密码。
Https头字段	可添加 Http 头字段，可设置字段名称和字段值。
有效载荷	当使用 POST 请求方法时，可根据需要传输数据的类型设置有效载荷。
文件密码	如果 Excel 文件为加密文件，需输入 Excel 的密码。
转化第一行为列头	勾选此项后，会将文件中第一行的内容作为列头；不勾选此项则默认列名为 Excel 默认列名：A,B,C...。
加载隐藏数据表	勾选此项后，会加载隐藏的表。
转化空单元格为DBNull	- - 勾选此项后，会将空单元格转换为Null； - 不勾选此项后，对空单元格的处理如下： - 列类型为 String，默认值为：""； - 列类型为 DateTime，默认值为：0001-01-01T00:00:00； - 列类型为 Number，默认值为：0。

4. 创建成功后，在门户网站的未分类下可以看到刚刚创建的数据源。

使用参数进行数据过滤

数据源的源类型选为网络时，可添加 URI 参数进行数据过滤。

添加参数后可在数据源地址、Http 头字段以及有效载荷中使用参数。引用参数时，需要使用符号“@”，如参数为 P1，那么使用 @P1 来引用参数1。

具体做法如下：

1. 在参数面板中，单击添加参数按钮。

2. 设置参数名称，数据类型和默认值。

默认值在进行数据查询时使用，必须设定一个过滤字段中的值作为默认值。预览数据源或在数据集中使用时，可以更改此过滤值。

3. 使用问号？和 @ 符号进行连接和参数引用。

参数使用在数据源地址时则需要使用问号？与原地址连接，如 http://gcef-monetdb.eastasia.cloudapp.azure.com:50001/api/autoTestExcel/urlencoded?id=@parameter1

而在Http 头字段和有效载荷中时，则仅需 @ 符号进行参数引用。

这里我们将参数用到了有效载荷中，如下图所示“ fileIndex ”为有效载荷中的一个参数，我们将该值为1的数据过滤出来。

4. 保存数据源，在门户网站中进行预览。会弹出参数输入框，此时您可以更改参数默认值然后进行预览。