Sql server 如何将crystalreportviewer与数据库连接?
我有一个sql表名Sql server 如何将crystalreportviewer与数据库连接?,sql-server,vb.net,crystal-reports,Sql Server,Vb.net,Crystal Reports,我有一个sql表名Patient\u Detail,我想用crystal report报告它,但错误是对象引用未设置为对象的实例。,位于rd.Load(“C:\Users….. Dim dap As SqlDataAdapter Dim dat As DataTable Dim bds As BindingSource Dim cmd As SqlCommand Dim ds As DataSet Dim rd As ReportDocument Private Sub Report_Load(
Patient\u Detail
,我想用crystal report报告它,但错误是对象引用未设置为对象的实例。
,位于rd.Load(“C:\Users…..
Dim dap As SqlDataAdapter
Dim dat As DataTable
Dim bds As BindingSource
Dim cmd As SqlCommand
Dim ds As DataSet
Dim rd As ReportDocument
Private Sub Report_Load(sender As Object, e As EventArgs) Handles MyBase.Load
cn.Open()
cmd = New SqlCommand
dap = New SqlAdapter
ds = New DataSet
rs = New ReportDocument
cmd.Connection = cn
cmd.CommandText = "SELECT * FROM Patient_Detail"
dap.SelectCommand = cmd
dap.Fill(ds, "Patient_Detail")
rd.Load("C:\Users\Hou Chandara\documents\visual studio 2013\Projects\WindowsApplication1\WindowsApplication1\MyReport.rpt")
rd.SetDataSource(ds)
CrystalReportViewer1.ReportSource = rd
CrystalReportViewer1.RefreshReport()
cn.Close()
End Sub
您需要先设置rd。
rd=新报告文档()
或在声明中
Dim rd作为新的报告文档