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這篇文章主要介紹“l(fā)inq級(jí)聯(lián)操作怎么實(shí)現(xiàn)”,在日常操作中,相信很多人在linq級(jí)聯(lián)操作怎么實(shí)現(xiàn)問(wèn)題上存在疑惑,小編查閱了各式資料,整理出簡(jiǎn)單好用的操作方法,希望對(duì)大家解答”linq級(jí)聯(lián)操作怎么實(shí)現(xiàn)”的疑惑有所幫助!接下來(lái),請(qǐng)跟著小編一起來(lái)學(xué)習(xí)吧!
1.我首先新建了兩張表一個(gè)是category,一個(gè)是product.
category表
product表
2.然后添加linq級(jí)聯(lián):
ALTER TABLE product ADD CONSTRAINT [FK_ product _Key] FOREIGN KEY ( catid )REFERENCES Category ( catid ) GO
3.代碼:添加的linq級(jí)聯(lián)代碼是:
Category_Product_ContextDataContext cpcontext = new Category_Product_ContextDataContext(System.Configuration.ConfigurationManager.ConnectionStrings["TestConnectionString"].ToString()); // 級(jí)聯(lián)添加 Category cat=new Category() ...{ Catid =1005, CatName = "設(shè)計(jì)", CatDescription = "好多設(shè)計(jì) " }; Product p1 = new Product() ...{ ProductName = "平面設(shè)計(jì)", ProductDescripton = "設(shè)計(jì)大", Category=cat }; Product p2 = new Product() ...{ ProductName = "立體設(shè)計(jì)", ProductDescripton = "新電腦", Category = cat }; Product p3 = new Product() ...{ ProductName = " 室內(nèi)設(shè)計(jì)", ProductDescripton = " 室內(nèi)設(shè)計(jì)林", Category = cat }; Product p4 = new Product() ...{ ProductName = "產(chǎn)品設(shè)計(jì)", ProductDescripton = "林", Category = cat }; Product p5 = new Product() ...{ ProductName = "建筑設(shè)計(jì)", ProductDescripton = "在", Category = cat }; cpcontext.Categories.InsertOnSubmit(cat); cpcontext.SubmitChanges();
刪除的linq級(jí)聯(lián)代碼:
刪除的原則是:先刪除從表的再刪除主表的
Category_Product_ContextDataContext cpcontext = new Category_Product_ContextDataContext(System.Configuration.ConfigurationManager.ConnectionStrings["TestConnectionString"].ToString()); Category singlecats = cpcontext.Categories.Single(p => p.Catid == 1004); foreach (Product p in cpcontext.Products.Where(p => p.CatId == 1004))//刪除從表 ...{ cpcontext.Products.DeleteOnSubmit(p); } cpcontext.Categories.DeleteOnSubmit(singlecats);//刪除主表 cpcontext.SubmitChanges();
到此,關(guān)于“l(fā)inq級(jí)聯(lián)操作怎么實(shí)現(xiàn)”的學(xué)習(xí)就結(jié)束了,希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí),快去試試吧!若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí),請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站,小編會(huì)繼續(xù)努力為大家?guī)?lái)更多實(shí)用的文章!
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