ASP.NET调用DLL范例

Standard
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'---------------------------------------------
'数据库链接DLL www.yemaosheng.com
'---------------------------------------------
Imports System.Data
Imports System.Data.OleDb
Public Class Conn
    Dim myConnection As OleDbConnection
    Dim myCommand As OleDbCommand
    Dim myDataadapter As SqlDataAdapter
    Dim myDatareader As OleDbDataReader
    Dim myDataset As DataSet
    '连接数据库
    Public Function Conection(ByVal strConn)
        myConnection = New OleDbConnection("PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA Source=" & strConn)
        myConnection.Open()
    End Function
 
    '执行Select将结果放入DataSet并返回
    Public Function ExecuteToDataAdapter(ByVal strSql, ByVal tb) As DataSet
        myCommand = New SqlCommand(strSql, myConnection)
        myDataadapter = New SqlDataAdapter(myCommand)
        myDataset = New DataSet
        myDataadapter.Fill(myDataset, tb)
        Return myDataset
    End Function
 
    '执行Select语句
    Public Function ExecuteQuery(ByVal strSql) As OleDbDataReader
        myCommand = New OleDbCommand(strSql, myConnection)
        myDatareader = myCommand.ExecuteReader()
        Return myDatareader
    End Function
 
    '执行Update和Insert语句
    Public Function ExecuteUpdate(ByVal strSql)
        myCommand = New OleDbCommand(strSql, myConnection)
        myCommand.ExecuteNonQuery()
    End Function
 
    '关闭数据库连接
    Public Function Close()
        myDatareader.Close()
        myConnection.Close()
        myConnection.Dispose()
    End Function
 
    '判断数据库中的字段是否为空
    Public Function DbLen(ByVal Field As Object) As Integer
        Dim len As Integer
        Dim NewVar As String = ""
        Dim ObjType As Type = Field.GetType()
        If ObjType.FullName = "System.DBNull" Then
            NewVar = Field.Value.ToString
        Else
            NewVar = Field
        End If
        Return NewVar.Length
    End Function
End Class
 
'---------------------------------------------
'aspx调用 www.yemaosheng.com
'---------------------------------------------
<%@ Page Language="VB" Debug="true" %>
<%@ Import Namespace="DBConn" %>
<%@ Import Namespace="System.Data.OleDb" %>
<%@ Import Namespace="System.Data" %>
 
<%
Dim conn As New Conn()
Dim dtr As OleDbDataReader
Dim sql As String
conn.Conection(Request.ServerVariables("APPL_PHYSICAL_PATH") & "common\survey.mdb")
If request.Form("radio_survey")<>"" Then
  sql="UPDATE tb_surveyitem SET surveyitem_item" & request.Form("radio_survey") & "=surveyitem_item" & request.Form("radio_survey") & "+1 WHERE surveyitem_survey=" & request.Form("hidden_surveyid")
  conn.ExecuteUpdate(sql)
End If
dtr=conn.ExecuteQuery("select * from tb_survey,tb_surveyitem where survey_id=surveyitem_survey and survey_id=" & request.Form("hidden_surveyid"))
dtr.Read()
%>
 
  <table width="500" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#333333">
  <tr>
    <td><table width="500" border="0" cellspacing="1" cellpadding"0">
      <tr align="center">
        <td colspan="2" bgcolor="#006699" class="title_text1"><strong><%=dtr("survey_title")%></strong></td>
      </tr>
  <%
    Dim I As Integer
    For I = 1 To 6
      If conn.DbLen(dtr("survey_item" & I & "title")) > 0 then
  %>
      <tr>
        <td width="100" bgcolor="#006699" class="title_text1"><%=dtr("survey_item" & I & "title")%></td>
        <td width="400" bgcolor="#ECF9FF" valign=middle>
        <img src='images/left-line.gif' width='<%=dtr("surveyitem_item" & I)*10%>' height=10>
        </td>
      </tr>
  <%
      End If
    Next
  %>
    </table></td>
  </tr>
</table>
<%
dtr.Close()
conn.Close()
%>
'---------------------------------------------
<TABLE cellSpacing=2 cellPadding=2 width=600 bgColor=#ffffff>
  <TBODY>
    <TR class="content_text1">
      <TD bgColor=#bfd5e3 colSpan=6>招聘信息</TD>
    </TR>
    <%
    Dim conn As New Conn()
    Dim dtr As OleDbDataReader
    conn.Conection(Request.ServerVariables("APPL_PHYSICAL_PATH") & "common\hr.mdb")
    dtr=conn.ExecuteQuery("select * from tb_hr where hr_state=1")
    While dtr.Read()
    %>
          <TR class="content_text1">
            <TD width=10% bgColor=#e9e9e9>职位名称:</TD>
            <TD width=50%><%=dtr("hr_job")%></TD>
            <TD width=10% bgcolor="#E9E9E9">性别要求:</TD>
            <TD width=10%><%=dtr("hr_gender")%></TD>
            <TD width=10% bgcolor="#E9E9E9">招聘人数:</TD>
            <TD width=10%><%=dtr("hr_num")%></TD>
          </TR>
          <TR class="content_text1">
            <TD width=10% valign="top" bgColor=#e9e9e9>职位描述:</TD>
            <TD colspan="5"><%=Replace(dtr("hr_desc"),vbCrLf,"<br>")%></TD>
          </TR>
          <TR class="content_text1">
            <TD bgColor=#bfd5e3 colspan="6"> </TD>
          </TR>
    <%
    End While
    dtr.Close()
    conn.Close()
    %>
  </TBODY>
</TABLE>
'---------------------------------------------
Dim conn As New Conn()
Dim ds As DataSet
Dim dr As DataRow
ds = conn.ExecuteToDataAdapter("select * from tb_board","board")
For Each dr In ds.Tables("board").Rows
    response.write(dr("board_id"))
Next