二、MVC3+EF单表增删改查
document 表为例 写入静态类 NorthwindDataProvider：
Controller可直接调用：如
1 //获取document表全部数据 2 NorthwindDataProvider.GetDocuments()
document 类：EF 映射
1 public static class NorthwindDataProvider 2 { 3 const string NorthwindDataContextKey = "DXNorthwindDataContext"; 4 5 public static NWindEntities DB 6 { 7 get 8 { 9 if (HttpContext.Current.Items[NorthwindDataContextKey] == null) 10 HttpContext.Current.Items[NorthwindDataContextKey] = new NWindEntities(); 11 return (NWindEntities)HttpContext.Current.Items[NorthwindDataContextKey]; 12 } 13 } 14 /// <summary> 15 /// 查询所有document表数据 16 /// </summary> 17 /// <returns></returns> 18 public static IEnumerable GetDocuments() 19 { 20 return from document in DB.Documents select document; 21 } 22 /// <summary> 23 /// 增加一条document数据 24 /// </summary> 25 /// <param name="doc">传入新数据</param> 26 public static void AddDocument(Document doc) 27 { 28 DB.Documents.AddObject(doc); 29 DB.SaveChanges(); 30 } 31 /// <summary> 32 /// 根据ID查询document数据 33 /// </summary> 34 /// <param name="id">传入主键</param> 35 /// <returns></returns> 36 public static Document GetDocumentById(int id) 37 { 38 var val = from document in DB.Documents where document.DocumentId == id select document; 39 return val.First(); 40 } 41 /// <summary> 42 /// 修改一条document数据 43 /// </summary> 44 /// <param name="doc">传入修改后的数据</param> 45 public static void UpdateDocument(Document doc) 46 { 47 Document oldDoc = DB.Documents.First(p => p.DocumentId == doc.DocumentId); 48 oldDoc.DocumentCode = doc.DocumentCode == null ? oldDoc.DocumentCode : doc.DocumentCode; 49 oldDoc.DocumentName = doc.DocumentName == null ? oldDoc.DocumentName : doc.DocumentName; 50 oldDoc.DocumentMemo = doc.DocumentMemo == null ? oldDoc.DocumentMemo : doc.DocumentMemo; 51 oldDoc.DocumentType = doc.DocumentType == null ? oldDoc.DocumentType : doc.DocumentType; 52 oldDoc.DocumentDate = doc.DocumentDate == null ? oldDoc.DocumentDate : doc.DocumentDate; 53 DB.SaveChanges(); 54 } 55 /// <summary> 56 /// 删除一条document数据 57 /// </summary> 58 /// <param name="id">被删除数据的主键</param> 59 public static void deleteDocument(int id) 60 { 61 var obj = DB.Documents.Where(c => c.DocumentId == id).First(); 62 DB.DeleteObject(obj); 63 DB.SaveChanges(); 64 } 65 }
