Question

我的SQL表中有一个位字段，如果它设置为0，我需要将其更新为1.我已编写代码为每个条目设置字段，但我需要检查它是否已经为0首先，我可以记录改变的内容。

这是我已经拥有的：

Public Function Update_User_to_TR(ByVal strUserName As String) As String

    Dim myUserName As String = strUserName.Trim
    Dim myReturn As String

    Try

        Dim sql As New SQL
        Dim strQuery As String

        strQuery = "Update dbo.USERS set user_field_Department_TR = 1 where USER_NAME = '" & myUserName & "'"
        myReturn = sql.SQLUpdateWT(strQuery)

    Catch ex As Exception
        myReturn = ex.ToString
        MsgBox(myReturn)
    End Try

    Return myReturn

End Function

Answer 1

在这种情况下，您应该升级到存储过程或函数，但这是一个示例查询。

"Declare @WillUpdate bit;Set @WillUpdate = 0;" & _
"If Exists(Select user_name from dbo.Users where user_name ='" & myUserName & _
"'        and user_field_department_tr = 0 " & _
"    Begin " & _
"      Update dbo.USERS set user_field_Department_TR = 1 where USER_NAME = '" & myUserName & "';" & _
"    Insert Into MyLog(field1, field2) " & _
"     Values('sampledata', 'field was updated from 0 to 1');" & _
"    End"

但请阅读其他评论并了解sql注入及其如何不好，然后学习如何使用参数化查询，例如ADO.NET。

VB.net - 检查SQL字段以查看是否设置了位

1 个答案: