Entity FrameWork 6幫助類，entityframework
1 public class BaseDAL
2 {
3 string strConn = "";
4 public BaseDAL(string connString)
5 {
6 strConn = connString;
7 }
8
9 #region 通用增刪改查
10 #region 非原始sql語句方式
11 /// <summary>
12 /// 新增
13 /// </summary>
14 /// <param name="entity">實體</param>
15 /// <returns>返回受影響行數</returns>
16 public bool Add<T>(T entity) where T : class
17 {
18 using (SysDb<T> db = new SysDb<T>(strConn))
19 {
20 db.Entry<T>(entity).State = EntityState.Added;
21 return db.SaveChanges() > 0;
22 }
23 }
24
25 /// <summary>
26 /// 修改
27 /// </summary>
28 /// <param name="entity">實體</param>
29 /// <returns>返回受影響行數</returns>
30 public bool Update<T>(T entity) where T : class
31 {
32 using (SysDb<T> db = new SysDb<T>(strConn))
33 {
34 db.Set<T>().Attach(entity);
35 db.Entry<T>(entity).State = EntityState.Modified;
36 return db.SaveChanges() > 0;
37 }
38 }
39
40 /// <summary>
41 /// 刪除
42 /// </summary>
43 /// <param name="entity">實體</param>
44 /// <returns>返回受影響行數</returns>
45 public bool Delete<T>(T entity) where T : class
46 {
47 using (SysDb<T> db = new SysDb<T>(strConn))
48 {
49 db.Set<T>().Attach(entity);
50 db.Entry<T>(entity).State = EntityState.Deleted;
51 return db.SaveChanges() > 0;
52 }
53 }
54
55 /// <summary>
56 /// 根據條件刪除
57 /// </summary>
58 /// <param name="deleWhere">刪除條件</param>
59 /// <returns>返回受影響行數</returns>
60 public bool DeleteByConditon<T>(Expression<Func<T, bool>> deleWhere) where T : class
61 {
62 using (SysDb<T> db = new SysDb<T>(strConn))
63 {
64 List<T> entitys = db.Set<T>().Where(deleWhere).ToList();
65 entitys.ForEach(m => db.Entry<T>(m).State = EntityState.Deleted);
66 return db.SaveChanges() > 0;
67 }
68 }
69
70 /// <summary>
71 /// 查找單個
72 /// </summary>
73 /// <param name="id">主鍵</param>
74 /// <returns></returns>
75 public T GetSingleById<T>(int id) where T : class
76 {
77 using (SysDb<T> db = new SysDb<T>(strConn))
78 {
79 return db.Set<T>().Find(id);
80 }
81 }
82
83 /// <summary>
84 /// 查找單個
85 /// </summary>
86 /// <param name="seleWhere">查詢條件</param>
87 /// <returns></returns>
88 public T GetSingle<T>(Expression<Func<T, bool>> seleWhere) where T : class
89 {
90 using (SysDb<T> db = new SysDb<T>(strConn))
91 {
92 return db.Set<T>().AsExpandable().FirstOrDefault(seleWhere);
93 }
94 }
95
96 /// <summary>
97 /// 獲取所有實體集合
98 /// </summary>
99 /// <returns></returns>
100 public List<T> GetAll<T>() where T : class
101 {
102 using (SysDb<T> db = new SysDb<T>(strConn))
103 {
104 return db.Set<T>().AsExpandable().ToList<T>();
105 }
106 }
107
108 /// <summary>
109 /// 獲取所有實體集合(單個排序)
110 /// </summary>
111 /// <returns></returns>
112 public List<T> GetAll<T, Tkey>(Expression<Func<T, Tkey>> orderWhere, bool isDesc) where T : class
113 {
114 using (SysDb<T> db = new SysDb<T>(strConn))
115 {
116 return CommonSort(db.Set<T>().AsExpandable(), orderWhere, isDesc).ToList<T>();
117 }
118 }
119
120 /// <summary>
121 /// 獲取所有實體集合(多個排序)
122 /// </summary>
123 /// <returns></returns>
124 public List<T> GetAll<T>(params OrderModelField[] orderByExpression) where T : class
125 {
126 using (SysDb<T> db = new SysDb<T>(strConn))
127 {
128 return CommonSort(db.Set<T>().AsExpandable(), orderByExpression).ToList();
129 }
130 }
131
132 /// <summary>
133 /// 單個排序通用方法
134 /// </summary>
135 /// <typeparam name="Tkey">排序字段</typeparam>
136 /// <param name="data">要排序的數據</param>
137 /// <param name="orderWhere">排序條件</param>
138 /// <param name="isDesc">是否倒序</param>
139 /// <returns>排序後的集合</returns>
140 public IQueryable<T> CommonSort<T, Tkey>(IQueryable<T> data, Expression<Func<T, Tkey>> orderWhere, bool isDesc) where T : class
141 {
142 if (isDesc)
143 {
144 return data.OrderByDescending(orderWhere);
145 }
146 else
147 {
148 return data.OrderBy(orderWhere);
149 }
150 }
151
152 /// <summary>
153 /// 多個排序通用方法
154 /// </summary>
155 /// <typeparam name="Tkey">排序字段</typeparam>
156 /// <param name="data">要排序的數據</param>
157 /// <param name="orderWhereAndIsDesc">字典集合(排序條件,是否倒序)</param>
158 /// <returns>排序後的集合</returns>
159 public IQueryable<T> CommonSort<T>(IQueryable<T> data, params OrderModelField[] orderByExpression) where T : class
160 {
161 //創建表達式變量參數
162 var parameter = Expression.Parameter(typeof(T), "o");
163
164 if (orderByExpression != null && orderByExpression.Length > 0)
165 {
166 for (int i = 0; i < orderByExpression.Length; i++)
167 {
168 //根據屬性名獲取屬性
169 var property = typeof(T).GetProperty(orderByExpression[i].PropertyName);
170 //創建一個訪問屬性的表達式
171 var propertyAccess = Expression.MakeMemberAccess(parameter, property);
172 var orderByExp = Expression.Lambda(propertyAccess, parameter);
173
174 string OrderName = "";
175 if (i > 0)
176 {
177 OrderName = orderByExpression[i].IsDESC ? "ThenByDescending" : "ThenBy";
178 }
179 else
180 OrderName = orderByExpression[i].IsDESC ? "OrderByDescending" : "OrderBy";
181
182 MethodCallExpression resultExp = Expression.Call(typeof(Queryable), OrderName, new Type[] { typeof(T), property.PropertyType },
183 data.Expression, Expression.Quote(orderByExp));
184
185 data = data.Provider.CreateQuery<T>(resultExp);
186 }
187 }
188 return data;
189 }
190
191 /// <summary>
192 /// 根據條件查詢實體集合
193 /// </summary>
194 /// <param name="seleWhere">查詢條件 lambel表達式</param>
195 /// <returns></returns>
196 public List<T> GetList<T>(Expression<Func<T, bool>> seleWhere) where T : class
197 {
198 using (SysDb<T> db = new SysDb<T>(strConn))
199 {
200 return db.Set<T>().AsExpandable().Where(seleWhere).ToList();
201 }
202 }
203
204 /// <summary>
205 /// 根據條件查詢實體集合
206 /// </summary>
207 /// <param name="seleWhere">查詢條件 lambel表達式</param>
208 /// <returns></returns>
209 public List<T> GetList<T, TValue>(Expression<Func<T, TValue>> seleWhere, IEnumerable<TValue> conditions) where T : class
210 {
211 using (SysDb<T> db = new SysDb<T>(strConn))
212 {
213
214 return db.Set<T>().AsExpandable().WhereIn<T, TValue>(seleWhere, conditions).ToList();
215 }
216 }
217
218 /// <summary>
219 /// 根據條件查詢實體集合(單個字段排序)
220 /// </summary>
221 /// <param name="seleWhere">查詢條件 lambel表達式</param>
222 /// <returns></returns>
223 public List<T> GetList<T, Tkey>(Expression<Func<T, bool>> seleWhere, Expression<Func<T, Tkey>> orderWhere, bool isDesc) where T : class
224 {
225 using (SysDb<T> db = new SysDb<T>(strConn))
226 {
227 return CommonSort(db.Set<T>().AsExpandable().Where(seleWhere), orderWhere, isDesc).ToList();
228 }
229 }
230
231 /// <summary>
232 /// 根據條件查詢實體集合(多個字段排序)
233 /// </summary>
234 /// <param name="seleWhere">查詢條件 lambel表達式</param>
235 /// <returns></returns>
236 public List<T> GetList<T>(Expression<Func<T, bool>> seleWhere, params OrderModelField[] orderByExpression) where T : class
237 {
238 using (SysDb<T> db = new SysDb<T>(strConn))
239 {
240 return CommonSort(db.Set<T>().AsExpandable().Where(seleWhere), orderByExpression).ToList();
241 }
242 }
243
244 /// <summary>
245 /// 獲取分頁集合(無條件無排序)
246 /// </summary>
247 /// <returns></returns>
248 public List<T> GetListPaged<T, Tkey>(int pageIndex, int pageSize, out int totalcount) where T : class
249 {
250 using (SysDb<T> db = new SysDb<T>(strConn))
251 {
252 totalcount = db.Set<T>().AsExpandable().Count();//獲取總數
253 //需要增加AsExpandable(),否則查詢的是所有數據到內存，然後再排序 AsExpandable是linqkit.dll中的方法
254 return db.Set<T>().AsExpandable().Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
255 }
256 }
257
258 /// <summary>
259 /// 獲取分頁集合(無條件單個排序)
260 /// </summary>
261 /// <returns></returns>
262 public List<T> GetListPaged<T, Tkey>(int pageIndex, int pageSize, Expression<Func<T, Tkey>> orderWhere, bool isDesc, out int totalcount) where T : class
263 {
264 using (SysDb<T> db = new SysDb<T>(strConn))
265 {
266 totalcount = db.Set<T>().AsExpandable().Count();//獲取總數
267 //需要增加AsExpandable(),否則查詢的是所有數據到內存，然後再排序 AsExpandable是linqkit.dll中的方法
268 return CommonSort(db.Set<T>().AsExpandable(), orderWhere, isDesc).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
269 }
270 }
271
272 /// <summary>
273 /// 獲取分頁集合(無條件多字段排序)
274 /// </summary>
275 /// <returns></returns>
276 public List<T> GetListPaged<T>(int pageIndex, int pageSize, out int totalcount, params OrderModelField[] orderByExpression) where T : class
277 {
278 using (SysDb<T> db = new SysDb<T>(strConn))
279 {
280 totalcount = db.Set<T>().AsExpandable().Count();//獲取總數
281 //需要增加AsExpandable(),否則查詢的是所有數據到內存，然後再排序 AsExpandable是linqkit.dll中的方法
282 return CommonSort(db.Set<T>().AsExpandable(), orderByExpression).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
283 }
284 }
285
286 /// <summary>
287 /// 獲取分頁集合(有條件無排序)
288 /// </summary>
289 /// <returns></returns>
290 public List<T> GetListPaged<T, Tkey>(int pageIndex, int pageSize, Expression<Func<T, bool>> seleWhere, out int totalcount) where T : class
291 {
292 using (SysDb<T> db = new SysDb<T>(strConn))
293 {
294 totalcount = db.Set<T>().AsExpandable().Where(seleWhere).Count();//獲取總數
295 //需要增加AsExpandable(),否則查詢的是所有數據到內存，然後再排序 AsExpandable是linqkit.dll中的方法
296 return db.Set<T>().AsExpandable().Where(seleWhere).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
297 }
298 }
299
300 /// <summary>
301 /// 獲取分頁集合(有條件單個排序)
302 /// </summary>
303 /// <returns></returns>
304 public List<T> GetListPaged<T, Tkey>(int pageIndex, int pageSize, Expression<Func<T, bool>> seleWhere,
305 Expression<Func<T, Tkey>> orderWhere, bool isDesc, out int totalcount) where T : class
306 {
307 using (SysDb<T> db = new SysDb<T>(strConn))
308 {
309 totalcount = db.Set<T>().AsExpandable().Where(seleWhere).Count();//獲取總數
310 //需要增加AsExpandable(),否則查詢的是所有數據到內存，然後再排序 AsExpandable是linqkit.dll中的方法
311 return CommonSort(db.Set<T>().AsExpandable().Where(seleWhere), orderWhere, isDesc).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
312 }
313 }
314
315 /// <summary>
316 /// 獲取分頁集合(有條件多字段排序)
317 /// </summary>
318 /// <returns></returns>
319 public List<T> GetListPaged<T>(int pageIndex, int pageSize, Expression<Func<T, bool>> seleWhere,
320 out int totalcount, params OrderModelField[] orderModelFiled) where T : class
321 {
322 using (SysDb<T> db = new SysDb<T>(strConn))
323 {
324 totalcount = db.Set<T>().AsExpandable().Where(seleWhere).Count();//獲取總數
325 //需要增加AsExpandable(),否則查詢的是所有數據到內存，然後再排序 AsExpandable是linqkit.dll中的方法
326 return CommonSort(db.Set<T>().AsExpandable().Where(seleWhere), orderModelFiled).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
327 }
328 }
329 #endregion
330
331 #region 原始sql操作
332 /// <summary>
333 /// 執行操作
334 /// </summary>
335 /// <param name="sql"></param>
336 /// <param name="paras"></param>
337 public void ExecuteSql(string sql, params object[] paras)
338 {
339 using (SysDb db = new SysDb(strConn))
340 {
341 db.Database.ExecuteSqlCommand(sql, paras);
342 }
343 }
344
345 /// <summary>
346 /// 查詢列表
347 /// </summary>
348 /// <typeparam name="T"></typeparam>
349 /// <param name="sql"></param>
350 /// <param name="paras"></param>
351 /// <returns></returns>
352 public List<T> QueryList<T>(string sql, params object[] paras) where T : class
353 {
354 using (SysDb db = new SysDb(strConn))
355 {
356 return db.Database.SqlQuery<T>(sql, paras).ToList();
357 }
358 }
359
360 /// <summary>
361 /// 查詢單個
362 /// </summary>
363 /// <typeparam name="T"></typeparam>
364 /// <param name="sql"></param>
365 /// <param name="paras"></param>
366 /// <returns></returns>
367 public T QuerySingle<T>(string sql, params object[] paras) where T : class
368 {
369 using (SysDb<T> db = new SysDb<T>(strConn))
370 {
371 return db.Database.SqlQuery<T>(sql, paras).FirstOrDefault();
372 }
373 }
374
375 /// <summary>
376 /// 執行事務
377 /// </summary>
378 /// <param name="lsSql"></param>
379 /// <param name="lsParas"></param>
380 public void ExecuteTransaction(List<String> lsSql, List<Object[]> lsParas)
381 {
382 using (SysDb db = new SysDb(strConn))
383 {
384 using (var tran = db.Database.BeginTransaction())
385 {
386 try
387 {
388 for (int i = 0; i < lsSql.Count; i++)
389 {
390 if (lsParas != null && lsParas.Count > 0)
391 {
392 db.Database.ExecuteSqlCommand(lsSql[i], lsParas[i]);
393 }
394 }
395 foreach (String item in lsSql)
396 {
397 db.Database.ExecuteSqlCommand(item);
398 }
399
400 tran.Commit();
401 }
402 catch (Exception ex)
403 {
404 tran.Rollback();
405 throw ex;
406 }
407 }
408 }
409 }
410 #endregion
411 #endregion
412
413 #region 通用屬性
414 /// <summary>
415 /// 獲取數據庫服務器當前時間。
416 /// </summary>
417 public DateTime ServerTime
418 {
419 get
420 {
421 using (SysDb db = new SysDb(strConn))
422 {
423 String sql = "SELECT GETDATE()";
424 Object objServerTime = db.Database.SqlQuery<Object>(sql);
425 return Convert.ToDateTime(objServerTime);
426 }
427 }
428 }
429
430 /// <summary>
431 /// 獲取數據庫版本。
432 /// </summary>
433 public String DatabaseVersion
434 {
435 get
436 {
437 using (SysDb db = new SysDb(strConn))
438 {
439 try
440 {
441 String sql = "SELECT Version FROM Sys_Version";
442 Object objServerTime = db.Database.SqlQuery<Object>(sql);
443 return Convert.ToString(objServerTime);
444 }
445 catch
446 {
447 }
448 return String.Empty;
449 }
450 }
451 }
452 #endregion
453
454 }
455 public static class QueryableExtension
456 {
457 /// <summary>
458 /// 擴展方法 支持 in 操作
459 /// </summary>
460 /// <typeparam name="TEntity">需要擴展的對象類型</typeparam>
461 /// <typeparam name="TValue">in 的值類型</typeparam>
462 /// <param name="source">需要擴展的對象</param>
463 /// <param name="valueSelector">值選擇器 例如c=>c.UserId</param>
464 /// <param name="values">值集合</param>
465 /// <returns></returns>
466 public static IQueryable<TEntity> WhereIn<TEntity, TValue>(this IQueryable<TEntity> source, Expression<Func<TEntity, TValue>> valueSelector,
467 IEnumerable<TValue> values)
468 {
469 if (null == valueSelector) { throw new ArgumentNullException("valueSelector"); }
470 if (null == values) { throw new ArgumentNullException("values"); }
471 ParameterExpression p = valueSelector.Parameters.Single();
472
473 if (!values.Any())
474 {
475 return source;
476 }
477 var equals = values.Select(value => (Expression)Expression.Equal(valueSelector.Body, Expression.Constant(value, typeof(TValue))));
478 var body = equals.Aggregate<Expression>((accumulate, equal) => Expression.Or(accumulate, equal));
479 return source.Where(Expression.Lambda<Func<TEntity, bool>>(body, p));
480 }
481 }
482 public struct OrderModelField
483 {
484
485 public bool IsDESC { get; set; }
486 public string PropertyName { get; set; }
487 }
488 dbcontext類：
489
490 public class SysDb : DbContext
491 {
492 bool isNew = true;//是否是新的sql執行
493 string strMsg = "";//sql執行的相關信息
494 string strConn = "";//數據庫連接字符串
495 string UserName = "";//日志用戶名稱
496 string AdditionalInfo = "";//日志額外信息
497 public SysDb(string connString) : // 數據庫鏈接字符串
498 base(connString)
499 {
500 strConn = connString;
501 Database.SetInitializer<SysDb>(null);//設置為空，防止自動檢查和生成
502 base.Database.Log = (info) => Debug.WriteLine(info);
503 }
504
505 public SysDb(string connString, string logUserName, string logAdditionalInfo) : // 數據庫鏈接字符串
506 base(connString)
507 {
508 strConn = connString;
509 Database.SetInitializer<SysDb>(null);//設置為空，防止自動檢查和生成
510 UserName = logUserName;
511 AdditionalInfo = logAdditionalInfo;
512 base.Database.Log = AddLogger;
513 }
514
515 protected override void OnModelCreating(DbModelBuilder modelBuilder)
516 {
517 //去掉復數映射
518 modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
519 base.OnModelCreating(modelBuilder);
520 }
521
522 /// <summary>
523 /// 添加日志
524 /// </summary>
525 /// <param name="info"></param>
526 public void AddLogger(string info)
527 {
528 if (info != "\r\n" && (!info.Contains("Sys_EventLog")))
529 {
530 string strTemp = info.ToUpper().Trim();
531 if (isNew)
532 {
533 //記錄增刪改
534 if (strTemp.StartsWith("INSERT") || strTemp.StartsWith("UPDATE") || strTemp.StartsWith("DELETE"))
535 {
536 strMsg = info;
537 isNew = false;
538 }
539 }
540 else
541 {
542 if (strTemp.StartsWith("CLOSED CONNECTION"))
543 {
544 //增加新日志
545 using (SysDb db = new SysDb(strConn))
546 {
547 try
548 {
549 //保存日志到數據庫或其他地方
550
551 }
552 catch (Exception ex)
553 {
554 using (System.IO.StreamWriter sw = new System.IO.StreamWriter(AppDomain.CurrentDomain.BaseDirectory + "//logError.txt"))
555 {
556 sw.Write(ex.Message);
557 sw.Flush();
558 }
559 }
560 }
561 //清空
562 strMsg = "";
563 isNew = true;
564 }
565 else
566 {
567 strMsg += info;
568 }
569 }
570
571 }
572 }
573
574
575 }
576 public class SysDb<T> : SysDb where T : class
577 {
578 public SysDb(string connString) : // 數據庫鏈接字符串
579 base(connString)
580 {
581 Database.SetInitializer<SysDb<T>>(null);//設置為空，防止自動檢查和生成
582 }
583
584 public SysDb(string connString, string logUserName, string logAdditionalInfo) : // 數據庫鏈接字符串
585 base(connString,logUserName,logAdditionalInfo)
586 {
587 Database.SetInitializer<SysDb<T>>(null);//設置為空，防止自動檢查和生成
588 }
589
590 public DbSet<T> Entities { get; set; }
591 }
592 界面使用：（bll層忽略）
593
594 public class BusinessController : Controller
595 {
596 //
597 // GET: /Jygl/Business/
598 BaseBLL basebll = new BaseBLL(WebHelper.Conn);
599
600 public ActionResult GetXMList(int page,int rows)
601 {
602 int count = 0;
603 //查詢條件
604 //Expression<Func<JY_XM, bool>> searchPredicate = PredicateBuilder.True<JY_XM>();
605 //searchPredicate = searchPredicate.And(c => c.UserName.Contains(""));
606 Expression<Func<JY_XM, int>> keySelector = u => u.UID;
607 string str = ExceptionHelper<JY_XM>.TryCatchPageQueryJson<int>(basebll.GetListPaged, page, rows, keySelector, false, out count);
608 return Content(str);
609 }
610
611 [HttpPost]
612 public ActionResult XMEdit(JY_XM jyxm)
613 {
614 basebll.Add(jyxm);
615 return View();
616 }
617
618 public ActionResult GetAllGCLB()
619 {
620
621 List<DICT_GCLB> lsGCLB = basebll.GetAll<DICT_GCLB>();
622 DICT_GCLB dicNew=new DICT_GCLB();
623 dicNew.GCLBText="-請選擇-";
624 dicNew.GCLBId=0;
625 lsGCLB.Add(dicNew);
626
627 return Content(WebHelper.Json(lsGCLB));
628 }
629
630 public ActionResult GetAllArea()
631 {
632 List<DICT_Area> lsArea = basebll.GetAll<DICT_Area>();
633 DICT_Area dicNew=new DICT_Area();
634 dicNew.AreaText="-請選擇-";
635 dicNew.AreaId=0;
636 lsArea.Add(dicNew);
637 return Content(WebHelper.Json(lsArea));
638 }
639 }
