Exemplo n.º 1
0
        //保存更新数据
        private void button2_Click(object sender, EventArgs e)
        {
            //1.采集用户输入
            TblClass model = new TblClass();

            model.TClassID   = Convert.ToInt32(lblid.Text);
            model.TClassName = textEditName.Text.Trim();
            model.TClassDesc = textEditClassDesc.Text.Trim();
            //2.连接数据库,执行更新
            string constr = "Data Source=DESKTOP-J4JFLTU\\SQLEXPRESS;Initial CataLog=MyFirstDataBase;Integrated Security=True";

            using (SqlConnection con = new SqlConnection(constr))
            {
                string sql = string.Format("update TblClass set tClassName='{0}',tClassDesc='{1}' where tClassid={2}"
                                           , model.TClassName, model.TClassDesc, model.TClassID);
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    con.Open();
                    int r = cmd.ExecuteNonQuery();
                    this.Text = "更新了" + r + "行";
                    //重新加载,绑定DataGridView
                    LoadData();
                }
            }
        }
Exemplo n.º 2
0
        private void LoadData()
        {
            List <TblClass> list   = new List <TblClass>();
            string          constr = "Data Source=DESKTOP-J4JFLTU\\SQLEXPRESS;Initial CataLog=MyFirstDataBase;Integrated Security=True";

            using (SqlConnection con = new SqlConnection(constr))
            {
                string sql = "select * from tblclass";
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    con.Open();
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        if (reader.HasRows)//是否查询到数据
                        {
                            //一条一条读取数据,自动下移
                            while (reader.Read())
                            {
                                TblClass model = new TblClass();
                                model.TClassID   = reader.GetInt32(0);
                                model.TClassName = reader.GetString(1);
                                model.TClassDesc = reader.IsDBNull(2)?"NULL":reader.GetString(2);
                                list.Add(model);//把读取到的数据加载到list集合中
                            }
                        }
                    }
                }
            }
            //数据绑定的时候只认属性,不认字段,内部通过反射实现
            this.dgvClass.DataSource = list;//数据绑定
        }
Exemplo n.º 3
0
        //行获取焦点事件,sender表示整个窗口控件事件
        private void dgvClass_RowEnter(object sender, DataGridViewCellEventArgs e)
        {
            //获取当前选中的行的对象
            DataGridViewRow currentRow = this.dgvClass.Rows[e.RowIndex];
            //获取当前行中绑定的Tblclass数据对象
            TblClass model = currentRow.DataBoundItem as TblClass;//转换类型

            if (model != null)
            {
                lblid.Text             = model.TClassID.ToString();
                textEditName.Text      = model.TClassName;
                textEditClassDesc.Text = model.TClassDesc;
            }
        }