Question

我正在尝试获取sql server中的所有数据行以打印所有值。这是我已经尝试过的代码，但它仍然无效。谁能告诉我这里有什么问题？我是vb.net的新手

For i = 1 To 100

    Dim testsection As String = e.Item.DataItem("sectionName")
    e.Item.Cells(4).Text = strSection & testsection
    Next

我不太明白它是如何获取数据的。我是一名新毕业生。但是他们已经把这个预先任务分配给了我这是我的DBFunction中的代码。

Public Function GetUserList(ByVal strUserLogin As String, ByVal strName As String, _
                            ByVal intCompanyID As Integer, ByVal tblName As String) As DataSet
    Dim oConn As SqlConnection = Nothing
    Dim SQLStr As String = ""
    Dim SubSQL As String = ""
    Dim CMD As SqlCommand = Nothing
    Dim DS As New DataSet
    Dim DA As New SqlDataAdapter
    Try
        oConn = New SqlConnection(ConnectionString)
        oConn.ConnectionString = ConnectionString
        oConn.Open()
        CMD = oConn.CreateCommand
        CMD.CommandType = CommandType.StoredProcedure
        SQLStr = "sp_tblUser_Get"

        'CMD.Parameters.Add("@CompanyID", SqlDbType.Int).Value = intCompanyID
        CMD.Parameters.Add("@LoginID", SqlDbType.VarChar, 50).Value = strUserLogin
        CMD.Parameters.Add("@Name", SqlDbType.VarChar, 50).Value = strName

        'If strUserLogin <> "" Then
        '    SubSQL = " AND u.UserLogin = " & SQLS(strUserLogin)
        'End If
        'If intCompanyID <> 0 Then
        '    SubSQL = " AND u.CompanyId = " & SQLN(intCompanyID)
        'End If
        'SQLStr = "select u.ID, u.UserLogin, u.Name, c.CompanyName, u.CreateDate from tblUser u " & _
        '    " inner join tblCompany c on u.CompanyId = c.ID WHERE u.ID <> 0 " & SubSQL

        CMD.CommandText = SQLStr
        DA.SelectCommand = CMD
        DA.Fill(DS, tblName)
        CMD = Nothing
        DA = Nothing
        oConn.Close()
        oConn = Nothing
    Catch ex As System.Exception
        DS = Nothing
    Finally
        If Not oConn Is Nothing Then
            oConn.Close()
            oConn = Nothing
        End If
        If Not CMD Is Nothing Then
            CMD = Nothing
        End If
    End Try
    Return DS
End Function

Answer 1

基本上，从Dim oConn As SqlConnection = Nothing到DA.SelectCommand = CMD的行用于创建与数据库的连接，并且具有调用名为sp_tblUser_Get的过程的步骤。

然后使用行

来设置此过程的所有必需参数

CMD.Parameters.Add("@LoginID", SqlDbType.VarChar, 50).Value = strUserLogin
CMD.Parameters.Add("@Name", SqlDbType.VarChar, 50).Value = strName

之后使用SqlDataAdapter的Fill方法数据集填充了输出。数据集DS可以包含单个DataTable或多个依赖于热存储过程的数据表。

我假设它包含单个数据表，然后如果要查看数据，则可以使用。

DataTable dt= DS.Tables[0];

此dt Datatablw将包含所有数据。要显示该数据，您可以使用如下所述的循环。

        DataTable dt = DS.Tables[0];

        foreach (DataRow dr in dt.Rows)
        {

            String Name = dr["FirstName"].ToString();
            int Age = Convert.ToInt32(dr["Age"]);

        }

从SQL Server获取数据并使用循环将其打印出来

1 个答案: