数据仓库，数据基础操作

  1 /// <summary>
  2 /// 此类作用：数据仓库，数据基础操作
  3 /// </summary>
  4 /// <typeparam name="TEntity">实体</typeparam>
  5 /// <remarks>
  6 /// zhangqc 2016.08.08 新建
  7 /// </remarks>
  8 public partial class Repository<TEntity> : IRepository<TEntity>, IDisposable
  9 where TEntity : class
 10 {
 11 /// <summary>
 12 /// 数据源上下文
 13 /// </summary>
 14 private readonly DbContext _ctx;
 15 
 16 /// <summary>
 17 /// 数据源上下文
 18 /// </summary>
 19 //[Obsolete("请小心使用")]
 20 public DbContext DbContext
 21 {
 22 get
 23 {
 24 return _ctx;
 25 }
 26 }
 27 
 28 /// <summary>
 29 /// 命令执行超时时间，单位秒，默认为300秒。
 30 /// </summary>
 31 public int? CommandTimeout
 32 {
 33 get
 34 {
 35 return _ctx.Database.CommandTimeout;
 36 }
 37 set
 38 {
 39 _ctx.Database.CommandTimeout = value;
 40 }
 41 }
 42 
 43 /// <summary>
 44 /// 返回EntitySet
 45 /// </summary>
 46 /// <typeparam name="T"></typeparam>
 47 /// <returns></returns>
 48 public EntitySet EntitySet<T>()
 49 {
 50 var adapter = (IObjectContextAdapter)_ctx;
 51 var objectContext = adapter.ObjectContext;
 52 var objectSet = objectContext.CreateObjectSet<TEntity>();
 53 return objectSet.EntitySet;
 54 }
 55 
 56 /// <summary>
 57 /// 返回ObjectContext
 58 /// </summary>
 59 /// <returns></returns>
 60 public ObjectContext ObjectContext()
 61 {
 62 var adapter = (IObjectContextAdapter)_ctx;
 63 return adapter.ObjectContext; 
 64 }
 65 
 66 
 67 /// <summary>
 68 /// 构造方法
 69 /// </summary>
 70 /// <param name="session"></param>
 71 public Repository(DbContext session)
 72 {
 73 _ctx = session;
 74 _ctx.Database.CommandTimeout = 300;
 75 //_objCtx = ((IObjectContextAdapter)_ctx).ObjectContext;
 76 }
 77 
 78 /// <summary>
 79 /// 获取指定记录集
 80 /// </summary>
 81 protected DbSet<T> DbSet<T>() where T : class
 82 {
 83 return _ctx.Set<T>();
 84 }
 85 
 86 #region IRepository<TEntity> Members
 87 
 88 /// <summary>
 89 /// 保存数据
 90 /// </summary>
 91 /// <returns>受影响的行数</returns>
 92 public int Save()
 93 {
 94 try
 95 {
 96 return _ctx.SaveChanges();
 97 }
 98 catch (System.Data.Entity.Validation.DbEntityValidationException ex)
 99 {
100 var msg = new List<string>();
101 foreach (var item in ex.EntityValidationErrors)
102 {
103 foreach (var err in item.ValidationErrors)
104 {
105 msg.Add(string.Format("{0} {1}", err.PropertyName, err.ErrorMessage));
106 }
107 }
108 throw new ApplicationException(string.Join("\n", msg));
109 }
110 }
111 
112 /// <summary>
113 /// 添加当前实体
114 /// </summary>
115 /// <param name="t">实体</param>
116 /// <returns>添加后的实体</returns>
117 public TEntity Add(TEntity t)
118 {
119 return Add<TEntity>(t);
120 }
121 
122 /// <summary>
123 /// 添加数据库中的实体
124 /// </summary>
125 /// <typeparam name="T">指定实体的类型</typeparam>
126 /// <param name="t">指定实体</param>
127 /// <returns>添加后的实体</returns>
128 public T Add<T>(T t)
129 where T : class
130 {
131 return DbSet<T>().Add(t);
132 }
133 
134 /// <summary>
135 /// 批量添加或更新当前实体
136 /// </summary>
137 /// <param name="entity">当前实体，可多个一起传入</param>
138 public void AddOrUpdate(params TEntity[] entity)
139 {
140 DbSet<TEntity>().AddOrUpdate<TEntity>(entity);
141 }
142 
143 /// <summary>
144 /// 批量添加或更新指定实体
145 /// </summary>
146 /// <typeparam name="T">指定实体类型</typeparam>
147 /// <param name="entity">指定实体，可多个一起传入</param>
148 public void AddOrUpdate<T>(params T[] entity) where T : class
149 {
150 DbSet<T>().AddOrUpdate<T>(entity);
151 }
152 
153 /// <summary>
154 /// 更新当前实体
155 /// </summary>
156 /// <param name="entity">当前实体</param>
157 /// <returns>更新后的实体</returns>
158 public TEntity Update(TEntity entity)
159 {
160 return Update<TEntity>(entity);
161 }
162 
163 /// <summary>
164 /// 更新指定实体
165 /// </summary>
166 /// <param name="entity">指定实体</param>
167 /// <returns>更新后的实体</returns>
168 public T Update<T>(T entity) where T : class
169 {
170 var entry = Attach(entity);
171 entry.State = EntityState.Modified;
172 return entity;
173 }
174 
175 /// <summary>
176 /// 按需修改当前实体
177 /// </summary>
178 /// <param name="entity">实体对象</param>
179 /// <param name="modifiedPropertys">需要修改的字段</param>
180 /// <returns>修改状态后的实体</returns>
181 public TEntity Update(TEntity entity, List<string> modifiedPropertys)
182 {
183 return Update<TEntity>(entity, modifiedPropertys);
184 }
185 
186 /// <summary>
187 /// 更新数据库中的实体
188 /// </summary>
189 /// <param name="entity">指定的实体</param>
190 /// <param name="modifiedPropertys">需要更新的字段名</param>
191 /// <returns>修改状态后的实体</returns>
192 public T Update<T>(T entity, List<string> modifiedPropertys) where T : class
193 {
194 var dbEntry = _ctx.Entry(entity);
195 dbEntry.State = EntityState.Unchanged;
196 
197 if (null != modifiedPropertys)
198 {
199 modifiedPropertys.ForEach(p =>
200 {
201 dbEntry.Property(p).IsModified = true;
202 });
203 }
204 return entity;
205 }
206 
207 /// <summary>
208 /// 删除当前实体
209 /// </summary>
210 /// <param name="entity">待删除的实体</param>
211 /// <returns>被删除的实体</returns>
212 public TEntity Delete(TEntity entity)
213 {
214 return Delete<TEntity>(entity);
215 }
216 
217 /// <summary>
218 /// 删除当前实体列表
219 /// </summary>
220 /// <param name="list">待删除的实体列表</param>
221 public void Delete(IEnumerable<TEntity> list)
222 {
223 Delete<TEntity>(list);
224 }
225 
226 /// <summary>
227 /// 删除当前实体列表
228 /// </summary>
229 /// <param name="list">待删除的实体</param>
230 public void Delete<T>(IEnumerable<T> list) where T : class
231 {
232 var l = list as IList<T> ?? list.ToList();
233 if (l.Any())
234 {
235 l.ForEach(p => Delete(p));
236 }
237 }
238 /// <summary>
239 /// 
240 /// </summary>
241 /// <typeparam name="T"></typeparam>
242 /// <param name="list"></param>
243 public void Delete<T>(IQueryable<T> list) where T : class
244 {
245 if (list.Any())
246 {
247 list.ForEach(p => Delete(p));
248 }
249 }
250 
251 
252 /// <summary>
253 /// 从数据库中删除指定实体
254 /// </summary>
255 /// <typeparam name="T">待删除的实体类型</typeparam>
256 /// <param name="entity">待删除的实体</param>
257 /// <returns>被删除的实体</returns>
258 public T Delete<T>(T entity) where T : class
259 {
260 Attach(entity);
261 return DbSet<T>().Remove(entity);
262 }
263 
264 /// <summary>
265 /// 删除数据库中指定实体
266 /// </summary>
267 /// <param name="predicate">条件</param>
268 public void Delete(Expression<Func<TEntity, bool>> predicate)
269 {
270 var dbSet = DbSet<TEntity>();
271 var q = dbSet.Where(predicate);
272 if (q.Any())
273 {
274 var l = q.ToList();
275 l.ForEach(p => dbSet.Remove(p));
276 }
277 }
278 
279 /// <summary>
280 /// 删除数据库中指定实体
281 /// </summary>
282 /// <typeparam name="T">指定实体的类型</typeparam>
283 /// <param name="predicate">条件</param>
284 public void Delete<T>(Expression<Func<T, bool>> predicate) where T : class
285 {
286 var dbSet = DbSet<T>();
287 var q = dbSet.Where(predicate);
288 if (q.Any())
289 {
290 var l = q.ToList();
291 l.ForEach(p => dbSet.Remove(p));
292 }
293 }
294 
295 /// <summary>
296 /// 删除当前实体，及关联实体
297 /// </summary>
298 /// <param name="entity">当前实体</param>
299 [Obsolete("测试中，暂不使用")]
300 public void DeleteRelatedEntries(TEntity entity)
301 {
302 throw new NotImplementedException();
303 }
304 
305 /// <summary>
306 /// 按主键查询当前实体，多主键的参数需要按定义时的次序传入
307 /// </summary>
308 /// <param name="keyValues">主键值，可多个，按定义的顺序传入即可</param>
309 /// <returns>找到的实体</returns>
310 public TEntity Find(params object[] keyValues)
311 {
312 return Find<TEntity>(keyValues);
313 }
314 
315 /// <summary>
316 /// 按主键查询指定实体，多主键的参数需要按定义时的次序传入
317 /// </summary>
318 /// <param name="keyValues">主键值，可多个，按定义的顺序传入即可</param>
319 /// <returns>找到的实体</returns>
320 public T Find<T>(params object[] keyValues) where T : class
321 {
322 return DbSet<T>().Find(keyValues);
323 }
324 
325 /// <summary>
326 /// 根据条件查询当前实体
327 /// </summary>
328 /// <param name="predicate">按条件查询</param>
329 /// <returns>找到的实体</returns>
330 public TEntity Find(Expression<Func<TEntity, bool>> predicate)
331 {
332 return Find(DbSet<TEntity>(), predicate);
333 }
334 
335 /// <summary>
336 /// 根据条件查询指定实体
337 /// </summary>
338 /// <typeparam name="T">指定的实体类型</typeparam>
339 /// <param name="predicate">按条件查询</param>
340 /// <returns>找到的实体</returns>
341 public T Find<T>(Expression<Func<T, bool>> predicate) where T : class
342 {
343 return Find(DbSet<T>(), predicate);
344 }
345 
346 /// <summary>
347 /// 根据条件查询指定实体
348 /// </summary>
349 /// <typeparam name="T">指定实体类型</typeparam>
350 /// <param name="dbSet">指定记录集</param>
351 /// <param name="predicate">条件表达式</param>
352 /// <returns>符合条件的实体</returns>
353 public T Find<T>(DbQuery<T> dbSet, Expression<Func<T, bool>> predicate) where T : class
354 {
355 return dbSet.SingleOrDefault(predicate);
356 }
357 
358 /// <summary>
359 /// 检查对象是否已存在
360 /// </summary>
361 /// <param name="predicate">查询条件</param>
362 /// <returns>True or False</returns>
363 public bool Any(Expression<Func<TEntity, bool>> predicate)
364 {
365 return Any(DbSet<TEntity>(), predicate);
366 }
367 
368 /// <summary>
369 /// 检查对象是否已存在
370 /// </summary>
371 /// <param name="predicate">查询条件</param>
372 /// <returns>True or False</returns>
373 public bool Any<T>(Expression<Func<T, bool>> predicate) where T : class
374 {
375 return Any(DbSet<T>(), predicate);
376 }
377 
378 /// <summary>
379 /// 检查对象是否已存在
380 /// </summary>
381 /// <typeparam name="T">指定实体类型</typeparam>
382 /// <param name="dbSet">指定记录集</param>
383 /// <param name="predicate">查询条件</param>
384 /// <returns>True or False</returns>
385 public bool Any<T>(DbQuery<T> dbSet, Expression<Func<T, bool>> predicate) where T : class
386 {
387 return dbSet.Any(predicate);
388 }
389 
390 /// <summary>
391 /// 查当前记录集
392 /// </summary>
393 /// <returns>当前类型的所有记录数</returns>
394 public int Count()
395 {
396 return Count(DbSet<TEntity>());
397 }
398 
399 /// <summary>
400 /// 查指定记录集
401 /// </summary>
402 /// <typeparam name="T">指定实体类型</typeparam>
403 /// <returns>所有记录数</returns>
404 public int Count<T>() where T : class
405 {
406 return Count(DbSet<T>());
407 }
408 
409 /// <summary>
410 /// 查指定查询的记录集
411 /// </summary>
412 /// <typeparam name="T">指定实体类型</typeparam>
413 /// <param name="dbSet">指定记录集</param>
414 /// <returns>所有记录数</returns>
415 public int Count<T>(DbQuery<T> dbSet) where T : class
416 {
417 return dbSet.Count();
418 }
419 
420 /// <summary>
421 /// 根据条件统计当前对象
422 /// </summary>
423 /// <param name="predicate"></param>
424 /// <returns></returns>
425 public int Count(Expression<Func<TEntity, bool>> predicate)
426 {
427 return Count(DbSet<TEntity>(), predicate);
428 }
429 
430 /// <summary>
431 /// 根据条件统计数据库中对象
432 /// </summary>
433 /// <typeparam name="T"></typeparam>
434 /// <param name="predicate"></param>
435 /// <returns></returns>
436 public int Count<T>(Expression<Func<T, bool>> predicate) where T : class
437 {
438 return Count(DbSet<T>(), predicate);
439 }
440 
441 /// <summary>
442 /// 根据DbQuery条件统计数据库中对象
443 /// </summary>
444 /// <typeparam name="T">实体类型</typeparam>
445 /// <param name="dbSet">记录集</param>
446 /// <param name="predicate">条件</param>
447 /// <returns>符合条件的记录数</returns>
448 public int Count<T>(DbQuery<T> dbSet, Expression<Func<T, bool>> predicate) where T : class
449 {
450 return dbSet.Count(predicate);
451 }
452 
453 /// <summary>
454 /// 查询实体，可对此进行后续操作。
455 /// </summary>
456 /// <returns>符合条件的结果集</returns>
457 public DbQuery<TEntity> DoQuery()
458 {
459 return DoQuery<TEntity>();
460 }
461 
462 /// <summary>
463 /// 查询实体，可对此进行后续操作。
464 /// </summary>
465 /// <typeparam name="T">指定数据集类型</typeparam>
466 /// <returns>符合条件的结果集</returns>
467 public DbQuery<T> DoQuery<T>() where T : class
468 {
469 return DbSet<T>();
470 }
471 
472 /// <summary>
473 /// 查询实体，可对此进行后续操作。
474 /// </summary>
475 /// <param name="predicate">条件表达式</param>
476 /// <returns>符合条件的结果集</returns>
477 public IQueryable<TEntity> DoQuery(Expression<Func<TEntity, bool>> predicate)
478 {
479 return DoQuery(DbSet<TEntity>(), predicate);
480 }
481 
482 
483 /// <summary>
484 /// 查询实体，可对此进行后续操作。
485 /// </summary>
486 /// <param name="predicate">条件表达式</param>
487 /// <returns>符合条件的结果集</returns>
488 public IEnumerable<TEntity> DoQueryFunc(Func<TEntity, bool> predicate)
489 {
490 return DoQueryFunc(DbSet<TEntity>(), predicate);
491 }
492 /// <summary>
493 /// 查询实体，可对此进行后续操作。
494 /// </summary>
495 /// <typeparam name="T">指定数据集类型</typeparam>
496 /// <param name="predicate">条件表达式</param>
497 /// <returns>符合条件的结果集</returns>
498 public IQueryable<T> DoQuery<T>(Expression<Func<T, bool>> predicate) where T : class
499 {
500 return DoQuery(DbSet<T>(), predicate);
501 }
502 
503 /// <summary>
504 /// 查询实体，可对此进行后续操作。
505 /// </summary>
506 /// <typeparam name="T">指定数据集类型</typeparam>
507 /// <param name="dbSet">数据集</param>
508 /// <param name="predicate">条件表达式</param>
509 /// <returns>符合条件的结果集</returns>
510 public IQueryable<T> DoQuery<T>(DbQuery<T> dbSet, Expression<Func<T, bool>> predicate) where T : class
511 {
512 return dbSet.Where(predicate);
513 }
514 
515  
516 
517 /// <summary>
518 /// 查询实体，可对此进行后续操作。
519 /// </summary>
520 /// <typeparam name="T"></typeparam>
521 /// <param name="dbSet"></param>
522 /// <param name="predicate"></param>
523 /// <returns></returns>
524 public IEnumerable<T> DoQueryFunc<T>(DbQuery<T> dbSet, Func<T, bool> predicate) where T : class
525 {
526 return dbSet.Where(predicate);
527 }
528 
529 /// <summary>
530 /// 查询实体，可对此进行后续操作。
531 /// </summary>
532 /// <param name="predicate">条件表达式</param>
533 /// <param name="sort">排序表达式</param>
534 /// <param name="skip">Skip索引</param>
535 /// <param name="take">当前取的数量</param>
536 /// <returns>符合条件的结果集</returns>
537 public IQueryable<TEntity> DoQuery(Expression<Func<TEntity, bool>> predicate, Expression<Func<TEntity, object>> sort, int skip, int take)
538 {
539 return DoQuery(DbSet<TEntity>(), predicate, sort, skip, take);
540 }
541 
542 /// <summary>
543 /// 查询实体，可对此进行后续操作。
544 /// </summary>
545 /// <typeparam name="T">指定数据集类型</typeparam>
546 /// <param name="dbSet">数据集</param>
547 /// <param name="predicate">条件表达式</param>
548 /// <param name="sort">排序表达式</param>
549 /// <param name="skip">Skip索引</param>
550 /// <param name="take">当前取的数量</param>
551 /// <returns>符合条件的结果集</returns>
552 public IQueryable<T> DoQuery<T>(DbQuery<T> dbSet, Expression<Func<T, bool>> predicate, Expression<Func<T, object>> sort, int skip, int take) where T : class
553 {
554 return dbSet.Skip(skip).Take(take).OrderBy(sort);
555 }
556 
557 /// <summary>
558 /// 执行SQL
559 /// </summary>
560 /// <param name="sql">SQL</param>
561 /// <param name="parameters">参数</param>
562 /// <returns>受影响的语句数量</returns>
563 public int ExecuteSqlCommand(string sql, params object[] parameters)
564 {
565 return _ctx.Database.ExecuteSqlCommand(sql, parameters);
566 }
567 
568 #endregion
569 
570 #region IDisposable Members
571 
572 /// <summary>
573 /// 释放资源
574 /// </summary>
575 public void Dispose()
576 {
577 if (null != _ctx)
578 {
579 _ctx.Dispose();
580 }
581 }
582 
583 #endregion
584 
585 #region 非公有方法
586 
587 /// <summary>
588 /// 附加指定实体
589 /// </summary>
590 /// <typeparam name="T">指定的实体类型</typeparam>
591 /// <param name="entity">实体数据</param>
592 /// <returns></returns>
593 protected DbEntityEntry<T> Attach<T>(T entity) where T : class
594 {
595 var entry = _ctx.Entry(entity);
596 if (entry.State == EntityState.Detached)
597 {
598 DbSet<T>().Attach(entity);
599 }
600 return entry;
601 }
602 
603 /// <summary>
604 /// 获取所有主键
605 /// </summary>
606 /// <param name="entity">实体</param>
607 /// <returns>主键名列表</returns>
608 protected IEnumerable<string> GetKeyPropertyNames(object entity)
609 {
610 var objContext = ((IObjectContextAdapter)_ctx).ObjectContext;
611 return objContext.ObjectStateManager
612 .GetObjectStateEntry(entity)
613 .EntityKey
614 .EntityKeyValues
615 .Select(k => k.Key);
616 }
617 
618 #endregion
619 
620 }