users.cls

vb与access数据库的操作实例

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "Users"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
'1 UserName  文本 长度 20  用户名
'2 UserPwd 文本 长度 20 密码
'3 UserType 数字 字节 用户类型，1-管理员；2-经理
'4 Email 文本 长度 50 电子邮件地址

Public UserName As String
Public UserPwd As String
Public UserType As Integer
Public Email As String

Public Sub Init()
  UserName = ""
  UserPwd = ""
  UserType = 0
  Email = ""
End Sub

'删除Users数据
Public Sub Delete(ByVal TmpUser As String)
  If TmpUser = "Admin" Then
    Exit Sub
  End If
  
  SqlStmt = "DELETE FROM Users WHERE UserName='" _
          + Trim(TmpUser) + "'"
  SQLExt (SqlStmt)
End Sub

Public Function GetInfo(ByVal TmpUser As String) As Boolean
  UserName = TmpUser
  Dim rs As New ADODB.Recordset
  
  SqlStmt = "SELECT * FROM Users WHERE UserName='" _
          + TmpUser + "'"
  Set rs = QueryExt(SqlStmt)
  If rs.EOF Then
    GetInfo = False
    Exit Function
  Else
    If IsNull(rs.Fields(1)) Then
      UserPwd = ""
    Else
      UserPwd = rs.Fields(1)
    End If
    
    If IsNull(rs.Fields(2)) Then
      UserType = 0
    Else
      UserType = rs.Fields(2)
    End If
    If IsNull(rs.Fields(3)) Then
      Email = ""
    Else
      Email = rs.Fields(3)
    End If
  End If
  GetInfo = True
End Function

Public Function In_DB(ByVal TmpUser As String) As Boolean
  Dim rs As New ADODB.Recordset
  SqlStmt = "SELECT * FROM Users WHERE UserName='" _
          + TmpUser + "'"
  Set rs = QueryExt(SqlStmt)
  If rs.EOF Then
    In_DB = False
  Else
    In_DB = True
  End If
End Function

Public Sub Insert()
  SqlStmt = "INSERT INTO Users(UserName,UserPwd,UserType,Email)" _
     + " Values('" + Trim(UserName) + "','" + Trim(UserPwd) + "'," _
     + Trim(UserType) + ",'" + Trim(Email) + "')"
  SQLExt (SqlStmt)
End Sub
'更改用户信息
Public Sub Update(ByVal TmpUser As String)
  SqlStmt = "Update Users Set UserType=" + Trim(UserType) _
          + ",Email='" + Trim(Email) + "'" _
          + " WHERE UserName='" + Trim(TmpUser) + "'"
  SQLExt (SqlStmt)
End Sub
'更改用户密码
Public Sub UpdatePassword(ByVal TmpUser As String)
  SqlStmt = "Update Users Set UserPwd='" + Trim(UserPwd) _
          + "' WHERE UserName='" + Trim(TmpUser) + "'"
  SQLExt (SqlStmt)
End Sub