{"id":128,"date":"2008-05-01T17:34:56","date_gmt":"2008-05-01T17:34:56","guid":{"rendered":""},"modified":"2008-05-01T17:34:56","modified_gmt":"2008-05-01T17:34:56","slug":"128","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=128","title":{"rendered":"LINQ\u4f53\u9a8c(9)\u2014\u2014LINQ to SQL\u8bed\u53e5\u4e4bInsert\/Update\/Delete\u64cd\u4f5c"},"content":{"rendered":"

LINQ\u4f53\u9a8c(9)——LINQ to SQL\u8bed\u53e5\u4e4bInsert\/Update\/Delete\u64cd\u4f5c<\/font><\/h1>\n

\u6211\u4eec\u7ee7\u7eed\u8bb2\u89e3LINQ to SQL\u8bed\u53e5\uff0c\u8fd9\u7bc7\u6211\u4eec\u6765\u8ba8\u8bbaInsert\/Update\/Delete\u64cd\u4f5c\u3002\u8fd9\u4e2a\u5728\u6211\u4eec\u7684\u7a0b\u5e8f\u4e2d\u6700\u4e3a\u5e38\u7528\u4e86\u3002\u6211\u4eec\u76f4\u63a5\u770b\u4f8b\u5b50\u3002<\/p>\n

Insert\/Update\/Delete\u64cd\u4f5c<\/font><\/h1>\n

Insert<\/h1>\n

1.\u7b80\u5355\u5f62\u5f0f<\/h2>\n

\u8bf4\u660e\uff1anew\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4f7f\u7528InsertOnSubmit\u65b9\u6cd5\u5c06\u5176\u52a0\u5165\u5230\u5bf9\u5e94\u7684\u96c6\u5408\u4e2d\uff0c\u4f7f\u7528SubmitChanges()\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u3002<\/p>\n

NorthwindDataContext <\/span>db = new <\/span>NorthwindDataContext<\/span>();\r\nvar <\/span>newCustomer = new <\/span>Customer<\/span>\r\n{\r\nCustomerID = "MCSFT"<\/span>,\r\nCompanyName = "Microsoft"<\/span>,\r\nContactName = "John Doe"<\/span>,\r\nContactTitle = "Sales Manager"<\/span>,\r\nAddress = "1 Microsoft Way"<\/span>,\r\nCity = "Redmond"<\/span>,\r\nRegion = "WA"<\/span>,\r\nPostalCode = "98052"<\/span>,\r\nCountry = "USA"<\/span>,\r\nPhone = "(425) 555-1234"<\/span>,\r\nFax = null\r\n<\/span>};\r\ndb.Customers.InsertOnSubmit(newCustomer);\r\ndb.SubmitChanges();<\/pre>\n
2.\u4e00\u5bf9\u591a\u5173\u7cfb<\/h2>\n
\u8bf4\u660e\uff1aCategory\u4e0eProduct\u662f\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u63d0\u4ea4Category(\u4e00\u7aef)\u7684\u6570\u636e\u65f6\uff0cLINQ to SQL\u4f1a\u81ea\u52a8\u5c06Product(\u591a\u7aef)\u7684\u6570\u636e\u4e00\u8d77\u63d0\u4ea4\u3002<\/p>\n
var <\/span>newCategory = new <\/span>Category<\/span>\r\n{\r\nCategoryName = "Widgets"<\/span>,\r\nDescription = "Widgets are the ……"<\/span>\r\n};\r\nvar <\/span>newProduct = new <\/span>Product<\/span>\r\n{\r\nProductName = "Blue Widget"<\/span>,\r\nUnitPrice = 34.56M,\r\nCategory = newCategory\r\n};\r\ndb.Categories.InsertOnSubmit(newCategory);\r\ndb.SubmitChanges();<\/pre>\n
3.\u591a\u5bf9\u591a\u5173\u7cfb<\/h2>\n
\u8bf4\u660e\uff1a\u5728\u591a\u5bf9\u591a\u5173\u7cfb\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u4f9d\u6b21\u63d0\u4ea4\u3002<\/p>\n
var <\/span>newEmployee = new <\/span>Employee\r\n<\/span>{\r\nFirstName = "Kira"<\/span>,\r\nLastName = "Smith"\r\n<\/span>};\r\nvar <\/span>newTerritory = new <\/span>Territory\r\n<\/span>{\r\nTerritoryID = "12345"<\/span>,\r\nTerritoryDescription = "Anytown"<\/span>,\r\nRegion = db.Regions.First()\r\n};\r\nvar <\/span>newEmployeeTerritory = new <\/span>EmployeeTerritory\r\n<\/span>{\r\nEmployee = newEmployee,\r\nTerritory = newTerritory\r\n};\r\ndb.Employees.InsertOnSubmit(newEmployee);\r\ndb.Territories.InsertOnSubmit(newTerritory);\r\ndb.EmployeeTerritories.InsertOnSubmit(newEmployeeTerritory);\r\ndb.SubmitChanges();<\/pre>\n
4.Override using Dynamic CUD<\/h2>\n
\u8bf4\u660e\uff1aCUD\u5c31\u662fCreate\u3001Update\u3001Delete\u7684\u7f29\u5199\u3002\u4e0b\u9762\u7684\u4f8b\u5b50\u5c31\u662f\u65b0\u5efa\u4e00\u4e2aID(\u4e3b\u952e)\u4e3a32\u7684Region\uff0c\u4e0d\u8003\u8651\u6570\u636e\u5e93\u4e2d\u6709\u6ca1\u6709ID\u4e3a32\u7684\u6570\u636e\uff0c\u5982\u679c\u6709\u5219\u66ff\u6362\u539f\u6765\u7684\u6570\u636e\uff0c\u6ca1\u6709\u5219\u63d2\u5165\u3002\uff08\u4e0d\u77e5\u9053\u8fd9\u6837\u8bf4\u5bf9\u4e0d\u5bf9\u3002\u5927\u5bb6\u6307\u70b9\u4e00\u4e0b\uff09<\/p>\n
Region <\/span>nwRegion = new <\/span>Region<\/span>()\r\n{\r\nRegionID = 32,\r\nRegionDescription = "Rainy"\r\n<\/span>};\r\ndb.Regions.InsertOnSubmit(nwRegion);\r\ndb.SubmitChanges();<\/pre>\n
Update<\/h1>\n
\u8bf4\u660e\uff1a\u66f4\u65b0\u64cd\u4f5c\uff0c\u5148\u83b7\u53d6\u5bf9\u8c61\uff0c\u8fdb\u884c\u4fee\u6539\u64cd\u4f5c\u4e4b\u540e\uff0c\u76f4\u63a5\u8c03\u7528SubmitChanges()\u65b9\u6cd5\u5373\u53ef\u63d0\u4ea4\u3002\u6ce8\u610f\uff0c\u8fd9\u91cc\u662f\u5728\u540c\u4e00\u4e2aDataContext\u4e2d\uff0c\u5bf9\u4e8e\u4e0d\u540c\u7684DataContex\u770b\u4e0b\u9762\u7684\u8bb2\u89e3\u3002<\/p>\n
1.\u7b80\u5355\u5f62\u5f0f<\/h2>\n
Customer <\/span>cust =\r\ndb.Customers.First(c => c.CustomerID == "ALFKI"<\/span>);\r\ncust.ContactTitle = "Vice President"<\/span>;\r\ndb.SubmitChanges();<\/pre>\n
2.\u591a\u4e2a\u9879<\/h2>\n
var <\/span>q = from <\/span>p in <\/span>db.Products\r\nwhere <\/span>p.CategoryID == 1\r\nselect <\/span>p;\r\nforeach <\/span>(var <\/span>p in <\/span>q)\r\n{\r\np.UnitPrice += 1.00M;\r\n}\r\ndb.SubmitChanges();<\/pre>\n
Delete<\/h1>\n
1.\u7b80\u5355\u5f62\u5f0f<\/h2>\n
\u8bf4\u660e\uff1a\u8c03\u7528DeleteOnSubmit\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n
OrderDetail <\/span>orderDetail =\r\ndb.OrderDetails.First\r\n(c => c.OrderID == 10255 && c.ProductID == 36);\r\ndb.OrderDetails.DeleteOnSubmit(orderDetail);\r\ndb.SubmitChanges();<\/pre>\n
2.\u4e00\u5bf9\u591a\u5173\u7cfb<\/h2>\n
\u8bf4\u660e\uff1aOrder\u4e0eOrderDetail\u662f\u4e00\u5bf9\u591a\u5173\u7cfb\uff0c\u9996\u5148DeleteOnSubmit\u5176OrderDetail(\u591a\u7aef)\uff0c\u5176\u6b21DeleteOnSubmit\u5176Order(\u4e00\u7aef)\u3002\u56e0\u4e3a\u4e00\u7aef\u662f\u4e3b\u952e\u3002<\/p>\n
var <\/span>orderDetails =\r\nfrom <\/span>o in <\/span>db.OrderDetails\r\nwhere <\/span>o.Order.CustomerID == "WARTH" <\/span>&&\r\no.Order.EmployeeID == 3\r\nselect <\/span>o;\r\nvar <\/span>order =\r\n(from <\/span>o in <\/span>db.Orders\r\nwhere <\/span>o.CustomerID == "WARTH" <\/span>&& o.EmployeeID == 3\r\nselect <\/span>o).First();\r\nforeach <\/span>(OrderDetail <\/span>od in <\/span>orderDetails)\r\n{\r\ndb.OrderDetails.DeleteOnSubmit(od);\r\n}\r\ndb.Orders.DeleteOnSubmit(order);\r\ndb.SubmitChanges();<\/pre>\n
3.Inferred Delete(\u63a8\u65ad\u5220\u9664)<\/h2>\n
\u8bf4\u660e\uff1aOrder\u4e0eOrderDetail\u662f\u4e00\u5bf9\u591a\u5173\u7cfb\uff0c\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u6211\u4eec\u5168\u90e8\u5220\u9664CustomerID\u4e3aWARTH\u548cEmployeeID\u4e3a3 \u7684\u6570\u636e\uff0c\u90a3\u4e48\u6211\u4eec\u4e0d\u987b\u5168\u90e8\u5220\u9664\u5462\uff1f\u4f8b\u5982Order\u7684OrderID\u4e3a10248\u7684OrderDetail\u6709\u5f88\u591a\uff0c\u4f46\u662f\u6211\u4eec\u53ea\u8981\u5220\u9664ProductID\u4e3a11\u7684OrderDetail\u3002\u8fd9\u65f6\u5c31\u7528Remove\u65b9\u6cd5\u3002<\/p>\n
Order <\/span>order = db.Orders.First(x => x.OrderID == 10248);\r\nOrderDetail <\/span>od =\r\norder.OrderDetails.First(d => d.ProductID == 11);\r\norder.OrderDetails.Remove(od);\r\ndb.SubmitChanges();<\/pre>\n
Update with Attach<\/h1>\n
\u8bf4\u660e\uff1a\u5728\u5bf9\u4e8e\u5728\u4e0d\u540c\u7684DataContext\u4e4b\u95f4\uff0c\u4f7f\u7528Attach\u65b9\u6cd5\u6765\u66f4\u65b0\u6570\u636e\u3002\u4f8b\u5982\u5728\u4e00\u4e2a\u540d\u4e3atempdb\u7684NorthwindDataContext\u4e2d\uff0c\u67e5\u8be2\u51faCustomer\u548cOrder\uff0c\u5728\u53e6\u4e00\u4e2aNorthwindDataContext\u4e2d\uff0cCustomer\u7684\u5730\u5740\u66f4\u65b0\u4e3a123 First Ave\uff0cOrder\u7684CustomerID \u66f4\u65b0\u4e3aCHOPS\u3002<\/p>\n
Customer <\/span>c1;\r\nList<\/span><Order<\/span>> deserializedOrders = new <\/span>List<\/span><Order<\/span>>();\r\nCustomer <\/span>deserializedC1;\r\nusing <\/span>(NorthwindDataContext <\/span>tempdb = new <\/span>NorthwindDataContext<\/span>())\r\n{\r\nc1 = tempdb.Customers.Single(c => c.CustomerID == "ALFKI"<\/span>);\r\ndeserializedC1 = new <\/span>Customer\r\n<\/span>{\r\nAddress = c1.Address,\r\nCity = c1.City,\r\nCompanyName = c1.CompanyName,\r\nContactName = c1.ContactName,\r\nContactTitle = c1.ContactTitle,\r\nCountry = c1.Country,\r\nCustomerID = c1.CustomerID,\r\nFax = c1.Fax,\r\nPhone = c1.Phone,\r\nPostalCode = c1.PostalCode,\r\nRegion = c1.Region\r\n};\r\nCustomer <\/span>tempcust =\r\ntempdb.Customers.Single(c => c.CustomerID == "ANTON"<\/span>);\r\nforeach <\/span>(Order <\/span>o in <\/span>tempcust.Orders)\r\n{\r\ndeserializedOrders.Add(new <\/span>Order\r\n<\/span>{\r\nCustomerID = o.CustomerID,\r\nEmployeeID = o.EmployeeID,\r\nFreight = o.Freight,\r\norderDate = o.OrderDate,\r\norderID = o.OrderID,\r\nRequiredDate = o.RequiredDate,\r\nShipAddress = o.ShipAddress,\r\nShipCity = o.ShipCity,\r\nShipName = o.ShipName,\r\nShipCountry = o.ShipCountry,\r\nShippedDate = o.ShippedDate,\r\nShipPostalCode = o.ShipPostalCode,\r\nShipRegion = o.ShipRegion,\r\nShipVia = o.ShipVia\r\n});\r\n}\r\n}\r\nusing <\/span>(NorthwindDataContext <\/span>db2 = new <\/span>NorthwindDataContext<\/span>())\r\n{\r\n\/\/\u5bf9Customer\u66f4\u65b0\uff0c\u4e0d\u80fd\u5199\u9519\r\n<\/span>db2.Customers.Attach(deserializedC1);\r\ndeserializedC1.Address = "123 First Ave"<\/span>;\r\n\/\/\u5bf9Order\u5168\u90e8\u66f4\u65b0\r\n<\/span>db2.Orders.AttachAll(deserializedOrders);\r\nforeach <\/span>(Order <\/span>o in <\/span>deserializedOrders)\r\n{\r\no.CustomerID = "CHOPS"<\/span>;\r\n}\r\ndb2.SubmitChanges();\r\n}<\/pre>\n
Update and Delete with Attach<\/h1>\n
\u8bf4\u660e\uff1a\u5728\u4e0d\u540c\u7684DataContext\u4e2d\uff0c\u5b9e\u73b0\u63d2\u5165\u3001\u66f4\u65b0\u3001\u5220\u9664\u3002\u770b\u4e0b\u9762\u7684\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
Customer <\/span>cust = null<\/span>;\r\nusing <\/span>(NorthwindDataContext <\/span>tempdb = new <\/span>NorthwindDataContext<\/span>())\r\n{\r\ncust = tempdb.Customers.First(x => x.CustomerID == "ALFKI"<\/span>);\r\n}\r\nOrder <\/span>orderA = cust.Orders.First();\r\nOrder <\/span>orderB = cust.Orders.First(x => x.OrderID > orderA.OrderID);\r\nusing <\/span>(NorthwindDataContext <\/span>db2 = new <\/span>NorthwindDataContext<\/span>())\r\n{\r\ndb2.Customers.Attach(cust);\r\ndb2.Orders.AttachAll(cust.Orders.ToList());\r\n\/\/\u66f4\u65b0Customer\u7684Phone.\r\n<\/span>cust.Phone = "2345 5436"<\/span>;\r\n\/\/\u66f4\u65b0OrderA\u7684ShipCity.\r\n<\/span>orderA.ShipCity = "Redmond"<\/span>;\r\n\/\/\u5220\u9664OrderB.\r\n<\/span>cust.Orders.Remove(orderB);\r\n\/\/\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684Order\u5230Customer\u4e2d.\r\n<\/span>Order <\/span>orderC = new <\/span>Order<\/span>() { ShipCity = "New York" <\/span>};\r\ncust.Orders.Add(orderC);\r\n\/\/\u63d0\u4ea4\u6267\u884c\r\n<\/span>db2.SubmitChanges();\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"
LINQ\u4f53\u9a8c(9)——LINQ to SQL...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-128","post","type-post","status-publish","format-standard","hentry","category-NET"],"_links":{"self":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/128","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=128"}],"version-history":[{"count":0,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/128\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}