[置顶] LINQ(LINQ to SQL)之调用存储过程的添加、查询、更新和删除

 介绍
以Northwind为 示例数据库，DLINQ(LINQ to SQL)之调用指定存储过程的添加操作、查询操作、更新操作和删除操作


示例
相关的存储过程

ALTER   PROCEDURE   [ dbo ] . [ spInsertCategory ]
     @CategoryName   nvarchar ( 15 ),
     @Description   ntext ,
     @CategoryID   int  OUTPUT
AS

SET  NOCOUNT  ON

INSERT   INTO   [ dbo ] . [ Categories ]  (
     [ CategoryName ] ,
     [ Description ]
)  VALUES  (
     @CategoryName ,
     @Description
)

SET   @CategoryID   =   SCOPE_IDENTITY ()

RETURN   @@ERROR

ALTER   PROCEDURE   [ dbo ] . [ spUpdateCategory ]
     @CategoryID   int ,
     @CategoryName   nvarchar ( 15 ),
     @Description   ntext
AS

SET  NOCOUNT  ON

UPDATE   [ dbo ] . [ Categories ]   SET
     [ CategoryName ]   =   @CategoryName ,
     [ Description ]   =   @Description
WHERE
     [ CategoryID ]   =   @CategoryID
    
RETURN   @@ERROR

ALTER   PROCEDURE   [ dbo ] . [ spDeleteCategory ]
     @CategoryID   int
AS

SET  NOCOUNT  ON

DELETE   FROM   [ dbo ] . [ Categories ]
WHERE
     [ CategoryID ]   =   @CategoryID
    
RETURN   @@ERROR

ALTER   PROCEDURE   [ dbo ] . [ spSelectCategory ]
     @CategoryID   int   =   null
AS

SET  NOCOUNT  ON
SET   TRANSACTION   ISOLATION   LEVEL   READ   COMMITTED

SELECT
     [ CategoryID ] ,
     [ CategoryName ] ,
     [ Description ] ,
     [ Picture ]
FROM
     [ dbo ] . [ Categories ]
WHERE
     @CategoryID   IS   NULL   OR   [ CategoryID ]   =   @CategoryID

ALTER   PROCEDURE   [ dbo ] . [ spSelectProduct ]
     @ProductID   int   =   null
AS

SET  NOCOUNT  ON
SET   TRANSACTION   ISOLATION   LEVEL   READ   COMMITTED

SELECT
     [ ProductID ] ,
     [ ProductName ] ,
     [ SupplierID ] ,
     [ CategoryID ] ,
     [ QuantityPerUnit ] ,
     [ UnitPrice ] ,
     [ UnitsInStock ] ,
     [ UnitsOnOrder ] ,
     [ ReorderLevel ] ,
     [ Discontinued ]
FROM
     [ dbo ] . [ Products ]
WHERE
     @ProductID   IS   NULL   OR   [ ProductID ]   =   @ProductID

SP.aspx

<% @ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="SP.aspx.cs"
    Inherits="LINQ_DLINQ_SP" Title="调用存储过程的添加、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 >

SP.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_SP : System.Web.UI.Page
{
    // 实例化一个NorthwindDataContext（DataContext）
    // 在对象关系设计器（Object Relational Designer）中拖进来存储过程，同时NorthwindDataContext类中就会自动生成调用相应存储过程的相应方法
    NorthwindDataContext _ctx = new NorthwindDataContext();

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

    private void BindCategory()
    {
        var categories = _ctx.GetCategory(null);

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

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        // categoryId - 用于获取存储过程的输出值（output）
        int? categoryId = null;
        // rtn - 用于获取存储过程的返回值（return）
        int rtn = _ctx.AddCategory(txtCategoryName.Text, txtDescription.Text, ref categoryId);

        Page.ClientScript.RegisterStartupScript(
            this.GetType(),
            "js",
            string.Format("alert('output:{0},return:{1}')", categoryId.ToString(), rtn.ToString()),
            true);

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

    protected void gvCategory_SelectedIndexChanged(object sender, EventArgs e)
    {
        var products = _ctx.GetProduct((int)gvCategory.SelectedValue);

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

    protected void gvCategory_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        // rtn - 用于获取存储过程的返回值（return）
        int rtn = _ctx.DeleteCategory((int)gvCategory.DataKeys[e.RowIndex].Value);

        Page.ClientScript.RegisterStartupScript(
            this.GetType(),
            "js",
            string.Format("alert('return:{0}')", rtn.ToString()),
            true);

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

    protected void gvCategory_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        // rtn - 用于获取存储过程的返回值（return）
        int rtn = _ctx.UpdateCategory(
            (int)gvCategory.DataKeys[e.RowIndex].Value,
            ((TextBox)gvCategory.Rows[e.RowIndex].Cells[2].Controls[0]).Text,
            ((TextBox)gvCategory.Rows[e.RowIndex].Cells[3].Controls[0]).Text);

        Page.ClientScript.RegisterStartupScript(
            this.GetType(),
            "js",
            string.Format("alert('return:{0}')", rtn.ToString()),
            true);

        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();
    }
}