如果我将 xml 数据类型列加载到数据表中，那么我可以对其执行 xml 查询吗？SQL Server 支持 .exist、.value 对 xml 列的查询。我正在尝试对数据表进行此类查询。
下面是代码的一部分，它显示了我在哪里出错。
Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
Dim timDiff As Double
Dim iter1 As Integer
TextBox1.Text &= Button15.Text & vbNewLine & " Iterations: " & TextBox2.Text & vbNewLine
timDiff = DateAndTime.Timer
Dim SqlAdapter As New SqlDataAdapter
Dim strTemp As String
Dim iRow As Integer
Dim rConn As New SqlConnection("data source=pc91\sqlexpress;user id=admin;password=abc;initial catalog=Checklists;connect timeout=2000;")
rConn.Open()
SqlAdapter = New SqlDataAdapter
sDataSet = New DataSet
sqldatatable = Nothing
SqlAdapter.SelectCommand = New SqlCommand("select * from DesignChanges", rConn)
SqlAdapter.Fill(sDataSet, "tmpTable")
sqldatatable = sDataSet.Tables("tmpTable")
For iter1 = 1 To Val(TextBox2.Text)
Try
For iRow = 0 To sqldatatable.Rows.Count - 1
strTemp = sqldatatable.Rows(iRow).Item("AllotedTo").ToString
Next iRow
Catch ex As Exception
MsgBox(ex.ToString & Space(10) & Err.Description)
End Try
Next
rConn.Close()
SqlAdapter.Dispose()
rConn.Dispose()
sDataSet = Nothing
SqlAdapter = Nothing
rConn = Nothing
timDiff = DateAndTime.Timer - timDiff
TextBox1.Text &= " Total Time Taken: " & timDiff & vbNewLine
End Sub
Private Sub Button17_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button17.Click
bs.DataSource = sqldatatable
DataGridView1.DataSource = bs
End Sub
Private Sub Button18_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button18.Click
bs.Filter = "[UserApproval].exist ('/Root/Row[User=''xyz'']') =1"
End Sub
End Class
在上面的代码中，错误类似于“表达式包含未定义的函数调用 UserApproval.exist()”。对于行 bs.Filter = "[UserApproval].exist ('/Root/Row[User=''xyz'']') =1" 。
如果我使用 .value 函数，则会出现错误，因为“表达式包含未定义的函数调用 UserApproval.value()。”
但相同的功能适用于 sql server 的 SQL 查询。