Question

我有以下代码，其中表名是学生，列名是sem_of_study的<{1}}

INT

我想知道我是否可以将SQL命令转换为整数，以便我可以在Dim userquery As String = "select sem_of_study from student where username='" + Session("user") + "'" Dim usercom As New SqlCommand(userquery, conn) Dim a = usercom.ExecuteReader语句中使用它！

这样变量a

IF

Answer 1

除了你应该使用parameterized queries（搜索SO - 很多例子）之外，你需要在DataReader行中做这样的阅读：

Dim a as Integer
Dim myReader As SqlDataReader = usercom.ExecuteReader()

If myReader.HasRows Then
  myReader.Read()
  a = myReader.GetInt32(0)
End If

参数：

Dim userquery As String = "select sem_of_study from student where username=@username"
Dim usercom as SqlCommand = new SqlCommand()
usercom.Connection = conn
usercom.CommandType = CommandType.Text
usercom.CommendText = userquery 
usercom.Parameters.AddWithValue("username", Session("user"))

如何将SQLCOMMAND转换为INT

1 个答案: