vb.net 如何从数据表中选择数据
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时间：2020-09-09 15:57:11 来源:igfitidea点击:
How to select data from datatable
提问by lawphotog
I am little bit stuck here .. I have a datatable as _
我有点卡在这里..我有一个数据表 _
Dim dtPupil As New DataTable
dtPupil.Columns.Add("PupilId", GetType(Integer))
dtPupil.Columns.Add("Forename", GetType(String))
dtPupil.Columns.Add("Surname", GetType(String))
I made a select (assuming names combination will be unique)
我做了一个选择（假设名称组合将是唯一的）
Dim strQuery As String = "Forename ='" & forename & "' and Surname = '" & surname & "'"
Dim dr As DataRow()
dr = dTablePupil.Select(strQuery)
I wanna have PupilIdas an Integer of the row that match, so
我想要PupilId作为匹配行的整数，所以
Dim PupilID As Integer = ??????????
What do I need to write here? There will only be 1 row returned.
我需要在这里写什么？只会返回 1 行。
回答by adatapost
Firstly check the length of DataRowarray,
首先检查DataRow数组的长度，
IF dr.Length<>0 Then
PupilID= CType(dr(0)("PupilId"),Integer)
End If
