基础·取出DataWindow中的列名

最新推荐文章于 2021-01-28 11:19:03 发布

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最新推荐文章于 2021-01-28 11:19:03 发布

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分类专栏：技术·编程语言·PB 文章标签： properties reference string object methods list

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本文档介绍了如何从PowerBuilder的DataWindow中获取列名，主要涉及DataWindow对象的属性和方法，包括Column.Count用于获取列数，以及Describe方法用于描述DataWindow对象的属性。示例代码展示了通过Describe方法获取每个列的名称。

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[参考]：《Power Builder Help》(8.0)

DataWindow Reference —— DataWindow Object Properties —— Controls in a DataWindow and their properties —— Properties for the DataWindow object

DataWindow Reference —— DataWindow Object Properties —— Controls in a DataWindow and their properties —— Properties for Column controls in DataWindow objects

DataWindow Reference —— Methods for the DataWindow Control —— Describe method

Column.Count

Description: The number of columns in the DataWindow object.

Syntax: dw_control.Object.DataWindow.Column.Count

Name

Description: The name of the control.

Syntax: dw_control.Object.controlname.Name

Describe method (DataWindows)

Description: Reports the values of properties of a DataWindow object and controls within the DataWindow object.

Syntax: string dwcontrol.Describe(string propertylist)

Argument

dwcontrol: A reference to a DataWindow control,DataStore, or child DataWindow.

propertylist: A string whose value is a blank-separated list of properties or Evaluate functions For a list of valid properties,see "DataWindow Object Properties".

Return value

string —— success

! —— invalid item

? —— no value for a property

NULL —— argument's value is NULL

[简单示例]：

string ls_name[] int li_counts,n string ls_no li_counts = long(dw_1.object.datawindow.column.count) //li_counts = long(dw_1.Describe(datawindow.column.count)) for n = 1 to li_counts ls_no = "#" + string(n) + ".Name" ls_name[n] = dw_1.Describe(ls_no) next