vb.net数据库密码 vb和数据库用户名和密码
vb.net如何创建mdb文件并设置密码
首先在项目的VB.NET界面，使用菜单【项目】--【添加引用】--【COM】
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选择 Microsoft ADO Ext. 2.x for DDL and Security
然后单击【确定】，完成引用。
完整代码如下：
Imports ADOX
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'创建空的access数据库文件--数据库文件.mdb，密码为123
Dim Mycat As Catalog = New Catalog()
Mycat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Jet OLEDB:Engine Type=5;Data Source= 数据库文件.mdb;Jet OLEDB:Database Password=123")
'以下代码创建一个名为“实验数据表”
Dim MyTable As ADOX.Table = New ADOX.Table '定义新表
MyTable.Name = "实验数据表" '表命名
'给表“实验数据表” 创建一个字符串字段，字段名“姓名”
MyTable.Columns.Append("姓名", , ADOX.DataTypeEnum.adWChar)
'给表“实验数据表” 创建一个整数字段，字段名“学号”
MyTable.Columns.Append("学号", ADOX.DataTypeEnum.adInteger) '追加一个数字型字段
'给字段“学号”创建一个主键“PimaryKey_Field”
MyTable.Keys.Append("学号", ADOX.KeyTypeEnum.adKeyPrimary, "学号")
Mycat.Tables.Append(MyTable) '把所有的新字段追加到表
MyTable = Nothing
Mycat = Nothing
End Sub
End Class
VB.net中如何调用带密码的Access数据库
"Provider=Microsoft.jet.oledb.4.0;data source=" "含路径的数据库文件" ";Persist Security Info=False
;jet oledb:database password=" "数据库密码"
VB.Net 怎么验证 SQL2008 数据库的ID与密码
基础类库：
Imports Microsoft.VisualBasic
'执行Access语句的封装类。
Public Class AccessExecClass
Private conn As Data.OleDb.OleDbConnection
Private cmd As Data.OleDb.OleDbCommand
'创建类对象，并连接到数据库。
Sub New()
If openAccess Then
Else
msgbox("open Access Fail.")
End If
End Sub
'创建类对象，并连接到数据库。 '输入带目录名称的数据库文件名称：dbFileName，例如：“\DB数据库\企业数据库.aspx”
Sub New(ByVal dbFileName As String)
If OpenAccess(dbFileName) Then
Else
MsgBox("open Access Fail.")
End If
End Sub
Function OpenAccess() As Boolean
OpenAccess = False
'检验用户的帐号密码是否正确
Dim provider As String '= ConfigurationManager.ConnectionStrings("ConnectionString").ProviderName
provider = "Provider=Microsoft.Jet.OLEDB.4.0"
Dim database As String
database = "Data Source=" System.Web.HttpContext.Current.Server.MapPath("\数据库.aspx") ";Persist Security Info=true"
conn = New Data.OleDb.OleDbConnection(provider ";" database)
conn.Open()
OpenAccess = True
End Function
Function OpenAccess(ByVal dbFileName As String) As Boolean
OpenAccess = False
'检验用户的帐号密码是否正确
Dim provider As String '= ConfigurationManager.ConnectionStrings("ConnectionString").ProviderName
provider = "Provider=Microsoft.Jet.OLEDB.4.0"
Dim database As String
database = "Data Source=" System.Web.HttpContext.Current.Server.MapPath(dbFileName) ";Persist Security Info=true"
conn = New Data.OleDb.OleDbConnection(provider ";" database)
conn.Open()
OpenAccess = True
End Function
'关闭数据库。
Sub CloseAccess()
cmd = Nothing
conn.Close()
End Sub
'执行一条Access语句，执行成功就返回True。
Function ExecAccessString(ByVal AccessStr As String) As Boolean
cmd = New Data.OleDb.OleDbCommand(AccessStr, conn)
cmd.ExecuteNonQuery()
'Dim aa As Data.OleDb.OleDbDataReader = cmd.ExecuteReader
ExecAccessString = True
End Function
'返回读取到的数据，注意是用地址传递方式返回
Sub ExecAccessString(ByVal AccessStr As String, ByRef AccessReader As Data.OleDb.OleDbDataReader)
cmd = New Data.OleDb.OleDbCommand(AccessStr, conn)
cmd.ExecuteNonQuery()
AccessReader = cmd.ExecuteReader
End Sub
End Class
登陆代码：
Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LinkButton1.Click
Dim wl As New WebLog '用户登录记录开始，仅对购买了Log 功能的用户，才开放此功能，否则不会实际记录Log
Dim sql As String
Dim aDB As New AccessExecClass
Dim mypw As String
Label1.Visible = False
Label2.Visible = False
Label3.Visible = False
Label4.Visible = False
'没有输入时,不能进行登陆
If TextBox1.Text = "" Then
Label1.Visible = True
Return
End If
If TextBox2.Text = "" Then
Label2.Visible = True
Return
End If
If TextBox3.Text = "" Then
Label3.Visible = True
Return
End If
If TextBox3.Text = TextBox4.Text Then
Else
Label3.Visible = True
Return
End If
Dim iRnd As Integer = Rnd(10) * 100
TextBox3.Text = ""
TextBox4.Text = iRnd.ToString
'Dim iRnd As Integer = Rnd(10) * 100
'注意:此处需要加入防止注入分析,包含'的肯定是特别语句,讲拒绝.
If TextBox1.Text.IndexOf("'") 0 Or TextBox2.Text.IndexOf("'") 0 Then
TextBox1.Text = "不能输入非法字符,将强制清空"
TextBox2.Text = ""
Else
Dim pw As New MD5EnCode(13, 19) ' '2次加密
sql = "select 权限组号,ID , 密码 from 编辑人数据 where 编辑姓名='" + TextBox1.Text + "'"
Dim aa As Data.OleDb.OleDbDataReader '= cmd.ExecuteReader
aDB.ExecAccessString(sql, aa)
If aa.Read() Then
'密码正确()
'sql = aa(2)'需要特别注意：只能单向解密，不能直接转换
mypw = pw.simDeCode(pw.simDeCode(aa(2)))
If TextBox2.Text = mypw Then
Session("LOGIN_Name") = TextBox1.Text '设置登录后的用户名称
Session("Login_Group") = aa(0) 'cmd.ExecuteScalar '设置登录后的权限级别
Session("Login_ID") = aa(1) 'cmd.ToString
'cmd = Nothing
'conn.Close()
Call wl.NewLog("登录", "管理员成功登录")
Response.Redirect("../WebManages/Default.ASPX")
Else
'密码错误()
sql = sql.Replace("'", "【单引号】")
sql = sql.Replace(",", "【逗号】")
Call wl.NewLog("登录", "管理员失败的登录", TextBox1.Text, sql.Replace("""", "【双引号】"), "")
Label4.Visible = True
End If
Else
'密码错误()
sql = sql.Replace("'", "【单引号】")
sql = sql.Replace(",", "【逗号】")
Call wl.NewLog("登录", "管理员失败的登录", TextBox1.Text, sql.Replace("""", "【双引号】"), "")
Label4.Visible = True
End If
End If
End Sub
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