因为经常需要访问sap操作数据，就封装了一个类方便调用，运行条件需要安装sap客户端，在sap客户端安装之后会带有一个com接口，本接口就通过这个com访问sap，因为com的后期绑定问题故使用了vb.net开发，分享给大家。
特色之处：把SAP的传入、传出内表直接映射成dotNet的DataTable方便操作，并提供了从字段列表到DataTable的转换函数。
'----------------------------------------------------------------
' Copyright (C) 2009
' 版权所有。
'
' 文件名 ：SAP.vb
' 功能描述：封装对SAP的基本访问，本类只提供基础信息，具体访问SAP RFC的类从此类继承
'
' 创建标识：www.cnblogs.com/81， 2009年12月1日
'
' 修改标识：www.cnblogs.com/81， 2009年12月9日
' 修改描述：增加传入内表、传出参数等的封闭操作
' ------------------------------------------------------------------------
Public Class SAP
Private m_sapObject As Object 'sap远程函数调用对象
Protected m_sapFun As Object 'sap函数
Private m_sapConnection As Object '与SAP的连接
''' <summary>
''' 构造函数，传入sap的基本信息
''' </summary>
''' <param name="sapSystem">Sap系统，可以传入null</param>
''' <param name="ApplicationServer">SAP服务器IP</param>
''' <param name="Client">集团号，如800</param>
''' <param name="SystemNumber">系统编号，如00</param>
''' <remarks></remarks>
Public Sub New(ByVal sapSystem As String, ByVal ApplicationServer As String, ByVal Client As String, ByVal SystemNumber As String)
Me.m_sapObject = CreateObject("SAP.Functions")
Me.m_sapConnection = Me.m_sapObject.Connection()
If String.IsNullOrEmpty(sapSystem) = False Then
Me.m_sapConnection.System = sapSystem
End If
Me.m_sapConnection.ApplicationServer = ApplicationServer
Me.m_sapConnection.Client = Client
Me.m_sapConnection.SystemNumber = SystemNumber
End Sub
''' <summary>
''' 登录SAP，成功，返回True，失败，返回False
''' </summary>
''' <param name="User">用户</param>
''' <param name="Password">口令</param>
''' <param name="Language">语言，如ZH、EN等，可以传入null</param>
''' <returns>是否登录成功</returns>
''' <remarks></remarks>
Public Function ConnectToSAP(ByVal User As String, ByVal Password As String, ByVal Language As String) As Boolean
Me.m_sapConnection.user = User
Me.m_sapConnection.Password = Password
If String.IsNullOrEmpty(Language) = False Then
Me.m_sapConnection.Language = Language
Else
Me.m_sapConnection.Language = "EN"
End If
Me.m_sapObject.AutoLogon = True '自动登录
Return Me.m_sapObject.Connection.logon(0, True) '登录是否成功
End Function
''' <summary>
''' 设置调用的sap函数名称
''' </summary>
''' <param name="sapFuncName">sap函数名称</param>
''' <remarks></remarks>
Public Sub 设置SAP远程函数名(ByVal sapFuncName As String)
Me.m_sapFun = Me.m_sapObject.Add(sapFuncName)
If m_sapFun Is Nothing Then
Throw New Exception("Sap远程函数名无效：" + sapFuncName)
End If
End Sub
''' <summary>
''' 设置Sap函数的传入调用参数
''' </summary>
''' <param name="paramName">参数名称</param>
''' <param name="paramValue">参数值</param>
''' <remarks></remarks>
Public Sub 设置参数(ByVal paramName As String, ByVal paramValue As Object)
Dim param As Object
param = Me.m_sapFun.Exports(paramName)
If param Is Nothing Then
Throw New Exception("Sap远程函数的参数名无效：" + paramName)
End If
param.Value = paramValue
End Sub
''' <summary>
''' 设置sap的传入内表，用dt_value模拟这个内表
''' </summary>
''' <param name="SapTableName">sap函数传入内表的名字</param>
''' <param name="dt_value">模拟的DataTable，要求与传入内表的字段名一致</param>
''' <remarks></remarks>
Public Sub 设置传入内表(ByVal SapTableName As String, ByVal dt_value As DataTable)
Dim sapdata As Object 'sap传入内表
Dim saprow As Object 'sap传入内表的一行
Dim dc As DataColumn
Dim index As Integer
sapdata = Me.m_sapFun.Tables(SapTableName)
For index = 0 To dt_value.Rows.Count - 1 '循环表，并给sap传入内表赋值
saprow = sapdata.Rows.Add() '传入内表新增一行记录，下面为传入内表记录赋值
For Each dc In dt_value.Columns
saprow(dc.ColumnName) = dt_value.Rows(index)(dc.ColumnName).ToString()
Next
Next
End Sub
''' <summary>
''' 当参数设置完成后，执行函数调用
''' </summary>
''' <remarks></remarks>
Public Sub 执行函数调用()
If Me.m_sapFun.Call() = False Then
Throw New Exception("Sap远程函数调用失败。") '从SAP取数出错，退出函数
End If
End Sub
''' <summary>
''' 根据字段列表（逗号分隔）建立指定字段的DataTable
''' </summary>
''' <param name="fields">字段列表（逗号分隔）</param>
''' <returns>空表</returns>
''' <remarks></remarks>
Public Function 建立空表(ByVal fields As String) As DataTable
Dim dt As New DataTable
Dim strs As String()
Dim s As String
strs = fields.Split(",")
For Each s In strs
dt.Columns.Add(s.Trim())
Next
Return dt
End Function
''' <summary>
''' 取得sap的传出参数值
''' </summary>
''' <param name="paramName">传出参数名</param>
''' <returns>传出参数值</returns>
''' <remarks></remarks>
Public Function 取Sap传出参数(ByVal paramName As String) As String
Dim param As Object
param = Me.m_sapFun.Imports(paramName)
If param Is Nothing Then
Throw New Exception("Sap远程函数的参数名无效：" + paramName)
End If
If param.Value Is Nothing Then
Return ""
Else
Return param.Value.ToString()
End If
End Function
''' <summary>
''' 把sap函数调用结构的传出内表转成dotNet的表
''' </summary>
''' <param name="fields">sap传出内表的字段列表，字段间以逗号分隔</param>
''' <param name="SapTableName">sap传出内表的表名</param>
''' <returns>把sap内表导出的dotnet表，字段都为string型</returns>
''' <remarks></remarks>
Public Function 取Sap传出表数据(ByVal fields As String, ByVal SapTableName As String, ByVal 是否去前后空格 As Boolean) As DataTable
'按字段列表建立表，fields中的字段列表用逗号分隔
Dim dt As DataTable
dt = Me.建立空表(fields)
'从sap表中读数据，循环sap中取得的数据，写入dt
Dim sapdata As Object
Dim saprow As Object
Dim dr As DataRow '数据增加的新行
Dim dc As DataColumn
sapdata = Me.m_sapFun.Tables(SapTableName)
For Each saprow In sapdata.Rows
dr = dt.NewRow()
For Each dc In dt.Columns
If 是否去前后空格 = True Then
dr(dc.ColumnName) = saprow(dc.ColumnName).ToString().Trim()
Else
dr(dc.ColumnName) = saprow(dc.ColumnName).ToString()
End If
Next
dt.Rows.Add(dr)
Next
Return dt
End Function
''' <summary>
''' 关闭sap的连接
''' </summary>
''' <remarks></remarks>
Public Sub DisConnectSAP()
Me.m_sapConnection.logoff()
End Sub
End Class