更新查询不起作用。表格数据没有变化

Question

Mysql更新查询不起作用。表格数据没有变化。我使用MySql和C＃。我的表格字段是：

username,
password,
name,
Loggedin

代码：

try
{
    string userlogout = "UPDATE  UsersTable SET Loggedin = '0'   WHERE username = '" + txtlogoutusername.Text+ "' ";
    obj.cmd.Connection = obj.conn;
    obj.cmd.CommandText = userlogout;
    obj.cmd.ExecuteNonQuery();
    userpanel.Visible = false;
}
catch (Exception ex)
{
    MessageBox.Show("" + ex);
}

Answer 1

App.config上的连接字符串

    public Manager GetManager(string aspNetUserId)
    {
        var manager = _db.Managers
            .Include(p => p.EmailAccount)
            .Where(p => p.AspNetUser.Id == aspNetUserId)
            .FirstOrDefault();
        return manager;
    }

检查您的选择语句

<connectionStrings>
    <add name ="con_str" connectionString="~~~~~your connection string~~~~~~~~~~~"/>
</connectionStrings>