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1) 这是我的代码来检查用户名和密码,如果匹配,则登录:DataReader的问题
Private Sub cmdOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdOK.Click
Try
Dim dr As OleDb.OleDbDataReader
Dim cmd As OleDb.OleDbCommand
Dim logQuery As String = ("SELECT * FROM Login_db where Username='" & txtUsername.Text & "'")
cnnOLEDB.Open()
cmd = New OleDb.OleDbCommand(logQuery, cnnOLEDB)
dr = cmd.ExecuteReader
If dr.Read = True Then <-------------------- problem
If txtUsername.Text = dr("Username") Then
If txtPassword.Text = dr("Password") Then
MsgBox("Hii")
End If
Else
MsgBox("Byee")
End If
End If
Catch ex As Exception
MsgBox(ex.Message)
cnnOLEDB.Close()
End Try
End Sub
if dr.read=true then
返回false即使I HV在我的表中的记录行...
2)这是我的代码在登录表中添加一个新用户
尝试
Dim addUser As String
addUser = "INSERT INTO Login_db(Username,Password) VALUES (@uname,@pswd)"
cnnOLEDB.Open()
Dim _comm As OleDb.OleDbCommand = New OleDb.OleDbCommand(addUser, cnnOLEDB)
_comm.Parameters.AddWithValue("@uname", txtUsername.Text)
_comm.Parameters.AddWithValue("@pswd", txtPasswd.Text)
_comm.ExecuteNonQuery()
cnnOLEDB.Close()
MsgBox("Record Inserted", MsgBoxStyle.OkOnly)
Catch ex As Exception
MsgBox(ex.Message)
cnnOLEDB.Close()
End Try
错误是:插入语句中的语法错误..我无法找到我的错误。
PLZ解决我的问题...谢谢..
非常感谢史蒂夫....它的工作原理 – Harabati 2013-04-04 10:10:49