2.8商品信息查询修改界面功能设计

功能：修改

image

功能：删除

image

ADO.NET删除数据库流程

image

迭代过程

image

DataGridView数据绑定流程

image

重要代码

// 连接字符串，注意与实际环境保持一致

String connStr = ConfigurationManager.ConnectionStrings["SuperMarketSales"].ConnectionString;

SqlConnection sqlConn = new SqlConnection(connStr);

try

{

    // 连接数据库

    sqlConn.Open();

    // DataGridView数据绑定

}

catch (Exception exp)

{

    MessageBox.Show("访问数据库错误：" + exp.Message);

}

finally

{

    sqlConn.Close();

}

// 构造命令

String sqlStr = "select

* from GOODS where 1=1 ";

// 添加查询条件

if (!this.tb_Id.Text.Trim().Equals("")){

   sqlStr += " and ID='" + this.tb_Id.Text.Trim() + "'";

}

if (!this.tb_Name.Text.Trim().Equals("")){

   sqlStr += " and NAME like '%" + this.tb_Name.Text.Trim() + "%'";

}

SqlCommand cmd = new SqlCommand(sqlStr, sqlConn);

// 将该查询过程绑定到DataAdapter

SqlDataAdapter adp = new SqlDataAdapter();

adp.SelectCommand = cmd;

// 将DataSet和DataAdapter绑定

DataSet ds = new DataSet();

// 自定义一个表(MyGoods)来标识数据库的GOODS表

adp.Fill(ds, "MyGoods");

// 指定DataGridView的数据源为DataSet的MyGoods表

this.dgv_Goods.DataSource = ds.Tables["MyGoods"];

private void dgv_Goods_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

    if (e.RowIndex != -1

&& e.ColumnIndex == 0)

    {

        string objectId = this.dgv_Goods["Id", e.RowIndex].Value.ToString();

        MessageBox.Show(objectId);

    }

    else if (e.RowIndex != -1

&& e.ColumnIndex == 1)

    {

        string objectId = this.dgv_Goods["Id", e.RowIndex].Value.ToString();

        MessageBox.Show(objectId);

    }

}