[英]How to check if LOGON USER already answered
在我的代码中,我有这个
<h2> Address Book</h2> <br />
<table>
<tr><td><b>User:</b></td><td><asp:Label ID="useren" runat="server"></asp:Label></td></tr>
<tr><td><b>Business:</b></td><td><asp:TextBox ID="business" runat="server" MaxLength="13"></asp:TextBox> (Example: 234925xxx)</td></tr>
<tr><td><b>Business 2:</b></td><td><asp:TextBox ID="business2" runat="server" MaxLength="13"></asp:TextBox> (Example: xxxx)</td></tr>
<tr><td><b>Mobile:</b></td><td><asp:TextBox ID="mobile" runat="server" MaxLength="13"></asp:TextBox> (Example: 9xxxxxxxx)</td></tr>
<tr><td colspan="2"><asp:Label ID="Label1" runat="server" Font-Bold="True"></asp:Label></td></tr>
<tr><td><asp:Button ID="Button1" runat="server" Text="Save" onclick="cmdSave_Click2" /></td><td></td></tr>
</table
在我后面的代码中检索登录用户
protected void Page_Load(object sender, EventArgs e)
{
useren.Text = "[" + HttpContext.Current.User.Identity.Name + "]";
}
这样可以将文本框和登录用户存储到数据库中
protected void cmdSave_Click2(object sender, EventArgs e)
{
string sFilePath = Server.MapPath("Database3.accdb");
OleDbConnection Conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + sFilePath + ";Persist Security Info=False;");
string insertCmd = "INSERT INTO Worker(Business,Business2,Mobile,username) VALUES (@Business,@Business2,@Mobile,@useren)";
using (Conn)
{
Conn.Open();
OleDbCommand myCommand = new OleDbCommand(insertCmd, Conn);
myCommand.Parameters.AddWithValue("@Business", business.Text);
myCommand.Parameters.AddWithValue("@Business2", business2.Text);
myCommand.Parameters.AddWithValue("@Mobile", mobile.Text);
myCommand.Parameters.AddWithValue("@useren", HttpContext.Current.User.Identity.Name);
myCommand.ExecuteNonQuery();
Label1.Text = "Saved Successfull!";
Label1.ForeColor = System.Drawing.Color.Green;
}
}
如何检查登录用户是否已经回答? 我的目标是,如果登录用户已经存在,则Access数据库会检索他的数据;或者,如果用户存在,则执行按钮onclick =“ cmdSave_Click2”时我该怎么做?例如,获取一个警告“用户已回答”的标签
以这种方式进行尝试。 它可能会给您一个解决问题的想法。
protected void cmdSave_Click2(object sender, EventArgs e)
{
string sFilePath = Server.MapPath("Database3.accdb");
OleDbConnection con = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + sFilePath + ";Persist Security Info=False;");
con.Open();
OleDbCommand cmd1 = new OleDbCommand("Select count(*) from Worker where username = '"+HttpContext.Current.User.Identity.Name+"'",con);
int total = (Int32)cmd1.ExecuteScalar();
if(total==0)
{
OleDbConnection Conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + sFilePath + ";Persist Security Info=False;");
string insertCmd = "INSERT INTO Worker(Business,Business2,Mobile,username) VALUES (@Business,@Business2,@Mobile,@useren)";
using (Conn)
{
Conn.Open();
OleDbCommand myCommand = new OleDbCommand(insertCmd, Conn);
myCommand.Parameters.AddWithValue("@Business", business.Text);
myCommand.Parameters.AddWithValue("@Business2", business2.Text);
myCommand.Parameters.AddWithValue("@Mobile", mobile.Text);
myCommand.Parameters.AddWithValue("@useren", HttpContext.Current.User.Identity.Name);
myCommand.ExecuteNonQuery();
Label1.Text = "Saved Successfull!";
Label1.ForeColor = System.Drawing.Color.Green;
Conn.Close();
}
}
else
{
Label1.Text = "Existing user";
}
con.Close();
}
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