尝试通过参数和 Oledb 在文本框中按用户名创建搜索数据库

Question

大家好，我正在开发一个搜索按钮，该按钮将通过用户名或城市或其他任何内容在数据库中搜索用户。 我试图制作用户名的参数，我在里面放了一个文本框，如果他在文本框中写了一些东西并单击按钮，它将只显示他在文本框中写的用户名的用户...... 但是它不起作用，请帮我找出如何制作它...

代码：

1 HTML（非常短）：

            <asp:TextBox ID="txtUserNameFooter" runat="server" />
        <asp:Button ID = "SearchButton" Text = "חפש" runat="server" onclientclick="SearchButton_Click" onclick="SearchButton_Click"  />

2 Asp.net (C#) 数据库

    protected void SearchButton_Click(object sender, EventArgs e)
{
    using (OleDbConnection sqlCon = new OleDbConnection(connectionStr))
    {
        sqlCon.Open();
        string query = "SELECT * FROM Users WHERE UserName=@UserName";
        OleDbCommand sqlCmd = new OleDbCommand(query, sqlCon);
        sqlCmd.Parameters.AddWithValue("@UserName", txtUserNameFooter.Text);
        sqlCmd.ExecuteNonQuery();
        PopulateGridView();
        sqlCon.Close();
    }
}

3 PopulateGridView 代码

 void PopulateGridView()
{
    DataTable dtbl = new DataTable();
    using (OleDbConnection sqlCon = new OleDbConnection(connectionStr))
    {
        sqlCon.Open();
        OleDbDataAdapter sqlDa = new OleDbDataAdapter("SELECT * FROM Users", sqlCon);
        sqlDa.Fill(dtbl);
    }
    if (dtbl.Rows.Count > 0)
    {
        AdminBook.DataSource = dtbl;
        AdminBook.DataBind();
    }
    else
    {
        dtbl.Rows.Add(dtbl.NewRow());
        AdminBook.DataSource = dtbl;
        AdminBook.DataBind();
        AdminBook.Rows[0].Cells.Clear();
        AdminBook.Rows[0].Cells.Add(new TableCell());
        AdminBook.Rows[0].Cells[0].ColumnSpan = dtbl.Columns.Count;
        AdminBook.Rows[0].Cells[0].Text = "No Data Found";
        AdminBook.Rows[0].Cells[0].HorizontalAlign = HorizontalAlign.Center;
    }
}

网站图片 Click Here to Look for it

我希望它在您在文本框中写入并按下按钮时进行搜索，如果他们的用户名与文本框类似，然后如果有，它将仅显示该用户名的数据... 请大家帮帮我，我会很高兴得到帮助:)

Answer 1

更新 PopulateGridView 方法以接受如下输入参数：

void PopulateGridView(string searchTerm)
{
    DataTable dtbl = new DataTable();
    using (OleDbConnection sqlCon = new OleDbConnection(connectionStr))
    {

        string query = "SELECT * FROM Users";

       OleDbCommand sqlCmd = new OleDbCommand(query, sqlCon);

       if(!String.IsNullOrWhiteSpace(searchTerm)) {
                 query+=" WHERE UserName=@UserName";
                 sqlCmd.CommandText = query;
                sqlCmd.Parameters.AddWithValue("@UserName", searchTerm);
         }

        sqlCon.Open();
        OleDbDataAdapter sqlDa = new OleDbDataAdapter(sqlCmd);

        sqlDa.Fill(dtbl);
    }

    if (dtbl.Rows.Count > 0)
    {
        AdminBook.DataSource = dtbl;
        AdminBook.DataBind();
    }
    else
    {
        dtbl.Rows.Add(dtbl.NewRow());
        AdminBook.DataSource = dtbl;
        AdminBook.DataBind();
        AdminBook.Rows[0].Cells.Clear();
        AdminBook.Rows[0].Cells.Add(new TableCell());
        AdminBook.Rows[0].Cells[0].ColumnSpan = dtbl.Columns.Count;
        AdminBook.Rows[0].Cells[0].Text = "No Data Found";
        AdminBook.Rows[0].Cells[0].HorizontalAlign = HorizontalAlign.Center;
    }
}

像这样更新 SearchButton_Click 方法：

protected void SearchButton_Click(object sender, EventArgs e)
{
   PopulateGridView(txtUserNameFooter.Text);        
}