9、步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除

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步步为营VS 2008 + .NET 3.5(9) - DLINQ(LINQ to SQL)之执行SQL语句的添加、查询、更新和删除

作者： webabcd


介绍
以Northwind为 示例数据库，DLINQ(LINQ to SQL)之执行指定SQL语句的添加操作、查询操作、更新操作和删除操作


示例
SQL.aspx

<% @ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="SQL.aspx.cs"
    Inherits="LINQ_DLINQ_SQL" Title="执行SQL语句的添加、查询、更新和删除"  %>

< asp:Content  ID ="Content1"  ContentPlaceHolderID ="head"  runat ="Server" >
</ asp:Content >
< asp:Content  ID ="Content2"  ContentPlaceHolderID ="ContentPlaceHolder1"  runat ="Server" >
     < p >
        分类名称： < asp:TextBox  ID ="txtCategoryName"  runat ="server" ></ asp:TextBox >
         &nbsp;&nbsp;  分类描述： < asp:TextBox  ID ="txtDescription"  runat ="server" ></ asp:TextBox >
         &nbsp;&nbsp;
         < asp:Button  ID ="btnAdd"  runat ="server"  Text ="添加"  OnClick ="btnAdd_Click"   />
     </ p >
     < asp:GridView  ID ="gvCategory"  runat ="server"  DataKeyNames ="CategoryID"  OnSelectedIndexChanged ="gvCategory_SelectedIndexChanged"
        OnRowDeleting ="gvCategory_RowDeleting"  OnRowCancelingEdit ="gvCategory_RowCancelingEdit"
        OnRowEditing ="gvCategory_RowEditing"  OnRowUpdating ="gvCategory_RowUpdating" >
         < Columns >
             < asp:CommandField  ShowSelectButton ="True"  ShowEditButton ="True"  ShowDeleteButton ="True" >
             </ asp:CommandField >
         </ Columns >
     </ asp:GridView >
     < br  />
     < asp:DetailsView  ID ="dvProduct"  runat ="server"  DataKeyNames ="ProductID" >
     </ asp:DetailsView >
</ asp:Content >

SQL.aspx.cs

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
using  System.Linq;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;
using  System.Xml.Linq;

using  DAL;

public  partial  class  LINQ_DLINQ_SQL : System.Web.UI.Page
{
    // 实例化一个NorthwindDataContext（DataContext）
    NorthwindDataContext _ctx = new NorthwindDataContext();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindCategory();
        }
    }

    private void BindCategory()
    {
        // 使用NorthwindDataContext对象的ExecuteQuery<T>()方法，通过指定的SQL语句返回指定对象的集合
        var categories = _ctx.ExecuteQuery<Categories>(@"select * from categories");

        gvCategory.DataSource = categories;
        gvCategory.DataBind();
    }

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        // 使用NorthwindDataContext对象的ExecuteCommand()方法，执行指定的SQL语句
        _ctx.ExecuteCommand(@"insert into categories (categoryname, description) values ({0}, {1})",
                            txtCategoryName.Text,
                            txtDescription.Text);

        gvCategory.EditIndex = -1;
        BindCategory();
    }

    protected void gvCategory_SelectedIndexChanged(object sender, EventArgs e)
    {
        // 使用NorthwindDataContext对象的ExecuteQuery<T>()方法，通过指定的SQL语句返回指定对象的集合
        var products = _ctx.ExecuteQuery<Products>(@"select * from products where productid={0}", gvCategory.SelectedValue);

        dvProduct.DataSource = products;
        dvProduct.DataBind();
    }

    protected void gvCategory_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        // 使用NorthwindDataContext对象的ExecuteCommand()方法，执行指定的SQL语句（调用存储过程）
        _ctx.ExecuteCommand(@"exec sp_DeleteCategory {0}", gvCategory.DataKeys[e.RowIndex].Value);

        gvCategory.EditIndex = -1;
        BindCategory();
    }

    protected void gvCategory_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        // 使用NorthwindDataContext对象的ExecuteCommand()方法，执行指定的SQL语句
        _ctx.ExecuteCommand(@"update categories set categoryname={0}, description={1} where categoryid={2}",
                            ((TextBox)gvCategory.Rows[e.RowIndex].Cells[2].Controls[0]).Text,
                            ((TextBox)gvCategory.Rows[e.RowIndex].Cells[3].Controls[0]).Text,
                            gvCategory.DataKeys[e.RowIndex].Value);

        gvCategory.EditIndex = -1;
        BindCategory();
    }

    protected void gvCategory_RowEditing(object sender, GridViewEditEventArgs e)
    {
        gvCategory.EditIndex = e.NewEditIndex;
        BindCategory();
    }

    protected void gvCategory_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        gvCategory.EditIndex = -1;
        BindCategory();
    }
}

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