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步步为营VS 2008 + .NET 3.5(10) - DLINQ(LINQ to SQL)之调用存储过程的添加、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>
                   分类描述:<asp:TextBox ID="txtDescription" runat="server"></asp:TextBox>
                  
                <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();
        }
}