Asp.net n直接从数据库查询。我需要在android应用程序中显示所有地址信息。这将是一种只读情况。那么，在参数上，我是否将PhyaddrStreet声明为空字符串？@MarkBasler如果您想选择不为某些字段输入值，请看Dillie-O答案中的链接。这些值就是从

---

n直接从数据库查询。我需要在android应用程序中显示所有地址信息。这将是一种只读情况。那么，在参数上，我是否将PhyaddrStreet声明为空字符串？@MarkBasler如果您想选择不为某些字段输入值，请看Dillie-O答案中的链接。这些值就是从数据库中提取的值，对吗？@MarkBasler请解释代码的确切意图。我希望直接从数据库中提取查询中列出的列的值。我需要在android应用程序中显示所有地址信息。这将是一种只读的情况。

<WebMethod()> _
Public Function GetAddresses(ByVal skip As Integer, ByVal take As Integer) As FuelStop()
    Dim resultList = New List(Of FuelStop)()
    Using sqlCon As New SqlConnection()
        sqlCon.ConnectionString = "Data Source=(local);Initial Catalog=DEV_DB;User ID=*****;Password=**********"
        Dim command As New SqlCommand("SELECT * FROM Gas_Stations WHERE Location_Type = 1 AND [ Physical_Address_Street] = @Physical_Address_Street AND [ Physical_Address_Local] = @Physical_Address_Local AND [Physical_Address_State] = @Physical_Address_State AND [ Physical_Address_Zip] = @Physical_Address_Zip AND [ Phone_Number] = @Phone_Number")
        command.Parameters.Add("@Physical_Address_Street", SqlDbType.VarChar, 50, "Physical_Address_Street")
        command.Parameters.Add("@Physical_Address_Local", SqlDbType.VarChar, 50, "Physical_Address_Local")
        command.Parameters.Add("@Physical_Address_State", SqlDbType.VarChar, 50, "Physical_Address_State")
        command.Parameters.Add("@Physical_Address_Zip", SqlDbType.VarChar, 50, "Physical_Address_Zip")
        command.Parameters.Add("@Phone_Number", SqlDbType.VarChar, 50, "Phone_Number")

        command.Connection = sqlCon
        sqlCon.Open()

        Using reader = command.ExecuteReader()
            While reader.Read()
                Dim addr = New FuelStop()
                addr.Physical_Address_Street = reader.GetString(0)
                addr.Physical_Address_Local = reader.GetString(1)
                addr.Physical_Address_State = reader.GetString(2)
                addr.Physical_Address_Zip = reader.GetString(3)
                addr.Phone_Number = reader.GetString(4)

                resultList.Add(addr)
            End While
        End Using
    End Using
    Return resultList.Skip(skip).Take(take).ToArray()
End Function

Dim command As New SqlCommand
   ("SELECT * FROM Gas_Stations 
      WHERE Location_Type = 1
            AND
            Physical_Address_Street = @Physical_Address_Street 
            AND 
            Physical_Address_Local = @Physical_Address_Local 
            AND 
            Physical_Address_State = @Physical_Address_State
            AND
            Physical_Address_Zip = @Physical_Address_Zip
            AND 
            Phone_Number = @Phone_Number
    )

Dim command As New SqlCommand("SELECT * FROM Gas_Stations WHERE Location_Type = 1 AND [Physical_Address_Street] = @Physical_Address_Street AND [Physical_Address_Local] = @Physical_Address_Local AND [Physical_Address_State] = @Physical_Address_State AND [Physical_Address_Zip] = @Physical_Address_Zip AND [Phone_Number] = @Phone_Number")

Dim sql = <sql>
        SELECT
            [Physical_Address_Street]
            , [Physical_Address_Local]
            , [Physical_Address_State]
            , [Physical_Address_Zip]
            , [Phone_Number]
        FROM Gas_Stations
        WHERE Location_Type = 1
            AND [Physical_Address_Street] = @Physical_Address_Street
            AND [Physical_Address_Local] = @Physical_Address_Local
            AND [Physical_Address_State] = @Physical_Address_State
            AND [Physical_Address_Zip] = @Physical_Address_Zip
            AND [Phone_Number] = @Phone_Number
        </sql>

Dim command As New SqlCommand()
command.CommandText = CStr(sql)

command.Parameters.Add("@Physical_Address_Street", SqlDbType.VarChar, 50).Value = physAddrStreet

command.Parameters.Add("@Physical_Address_Street", SqlDbType.VarChar, 50)
command.Parameters("@Physical_Address_Street").Value = physAddrStreet

Dim sql = <sql>
        SELECT
            [Physical_Address_Street]
            , [Physical_Address_Local]
            , [Physical_Address_State]
            , [Physical_Address_Zip]
            , [Phone_Number]
        FROM Gas_Stations
        WHERE Location_Type = 1
        </sql>