VB形式INSERT INTO说法,更改密码表单

嘿,我工作的一个学校项目,并遇到了一些问题VB形式INSERT INTO说法,更改密码表单

我试图做出改变密码表单。我有一个名为“tblLogin”的访问表,其中有用户名,密码,SecQuest,SecAns,Level。

用户名是属于我的登录表单

该方案目前未在tblLogin表更改密码值的公共变量

我以为这是我的INSERT问题INTO声明

非常感谢您提供任何帮助!

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click 

Dim sql As String

Dim Conn As New OleDb.OleDbConnection("PROVIDER = Microsoft.ACE.OLEDB.12.0;Data Source = C:\Users\Nelson\Documents\SystemDB\DB.accdb")

Dim ds As New DataSet

Dim da As OleDb.OleDbDataAdapter

Dim response As Integer

Try

Conn.Open()

'establishes communication with the database

sql = "SELECT Password FROM tblLogin WHERE Username = """ & LoginForm.username & """"

'declares SQL statement

da = New OleDb.OleDbDataAdapter(sql, Conn)

'runs sql statement on database

da.Fill(ds, "passwordcheck")

'fills in a dataset called "passwordcheck" with infomation selected by the sql statement

If TextBox1.Text = TextBox2.Text And TextBox3.Text = TextBox4.Text And TextBox1.Text = ds.Tables("passwordcheck").Rows(0).Item(0) And TextBox1.Text <> "" And TextBox2.Text <> "" And TextBox3.Text <> "" And TextBox4.Text <> "" Then

response = MessageBox.Show("Are you sure?", "Attention", MessageBoxButtons.YesNo)

If response = MsgBoxResult.Yes Then

Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand("INSERT INTO tblLogin Password VALUES (?) WHERE Username = """ & LoginForm.username & """", Conn)

cmd.Parameters.Add("@Password", OleDb.OleDbType.VarChar).Value = TextBox3.Text

Conn.Close()

End If

Else

MessageBox.Show("Passwords entered are incorrect", "Attention")

End If

Catch ex As Exception

MessageBox.Show("Passwords entered are incorrect", "Attention")

End Try

End Sub

回答:

PASSWORD是MS-Access的保留关键字。如果您想将其用于列名,请将其放在sqare括号内。说,请为您的命令使用参数化查询。

Conn.Open() 

'establishes communication with the database

sql = "SELECT [Password] FROM tblLogin WHERE Username = ?"

'declares SQL statement

da = New OleDb.OleDbDataAdapter(sql, Conn)

da.SelectCommand("@p1", LoginForm.username)

.....

最后的INSERT子句不需要一个WHERE语句 (这是没有意义的设置条件来选择一个插入一些行)

Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand("INSERT INTO tblLogin [Password] " & _ 

"VALUES (?) "

但看你的代码,那么很可能你需要更新,而不是一个INSERT

Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand("UPDATE tblLogin " & _ 

"SET [Password] = ? WHERE Username ?"

cmd.Parameters.Add("@Password", OleDb.OleDbType.VarChar).Value = TextBox3.Text

cmd.Parameters.Add("@Username", OleDb.OleDbType.VarChar).Value = TEXTBOXFORUSERNAME.Text

---和最重要的线---

cmd.ExecuteNonQuery() 

没有这个没有尝试更新数据库表

以上是 VB形式INSERT INTO说法,更改密码表单 的全部内容, 来源链接: utcz.com/qa/260875.html

回到顶部