通过使用以下vb函数，对数据库进行加密和解密运算，代码如下：

Private Function Encrypt(ByVal strSource As String, ByVal Key1 As Byte, _ ByVal Key2 As Integer) As String 
Dim bLowData As Byte 
Dim bHigData As Byte 
Dim i As Integer 
Dim strEncrypt As String 
Dim strChar As String 
For i = 1 To Len(strSource) 
　//从待加（解）密字符串中取出一个字符 
　strChar = Mid(strSource, i, 1) 
　//取字符的低字节和Key1进行异或运算 
　bLowData = AscB(MidB(strChar, 1, 1)) Xor Key1 
　//取字符的高字节和K2进行异或运算 
　bHigData = AscB(MidB(strChar, 2, 1)) Xor Key2 
　//将运算后的数据合成新的字符 
　strEncrypt = strEncrypt & ChrB(bLowData) & ChrB(bHigData) 
Next 
Encrypt = strEncrypt 
End Function