记EF的一个基本访问类
代码：
1 using EFModel;
2 using System;
3 using System.Collections.Generic;
4 using System.Data.Entity;
5 using System.Data.Entity.ModelConfiguration.Conventions;
6 using System.Linq;
7 using System.Text;
8 using System.Threading.Tasks;
9
10 namespace EFDal
11 {
12
13 /// <summary>
14 ///
15 /// </summary>
16 public class DataContext : DbContext
17 {
18 /// <summary>
19 ///
20 /// </summary>
21 public Boolean IsDisposed = false;
22
23
24 public static bool ModelFlag = true;
25
26 /// <summary>
27 ///
28 /// </summary>
29 static DataContext()
30 {
31 if (ModelFlag)
32 {
33 Database.SetInitializer<DataContext>(null); //不创建
34 }
35 else
36 {
37 Database.SetInitializer<DataContext>(new DefaultExistsDb());
38 }
39
40 }
41
42
43 /// <summary>
44 ///
45 /// </summary>
46 public DataContext()
47 : base()
48 {
49
50
51 }
52
53 /// <summary>
54 /// db connection string
55 /// </summary>
56 public string DBConnectionString
57 {
58 get;
59 set;
60 }
61
62 /// <summary>
63 ///
64 /// </summary>
65 /// <param name="connectionString"></param>
66 public DataContext(string connectionString)
67 : base(connectionString)
68 {
69 DBConnectionString = connectionString;
70 }
71
72 /// <summary>
73 /// get this db connection string
74 /// </summary>
75 /// <returns></returns>
76 public string GetConnectionString()
77 {
78 if (!string.IsNullOrEmpty(DBConnectionString))
79 {
80 return DBConnectionString;
81 }
82 else
83 {
84 return this.Database.Connection.ConnectionString;
85 }
86 }
87
88 /// <summary>
89 /// check the database real exist or not (check sql server have this db or not)
90 /// </summary>
91 /// <returns></returns>
92 public Boolean IsExists()
93 {
94 return this.Database.Exists();
95 }
96
97 /// <summary>
98 /// dispose
99 /// </summary>
100 /// <param name="disposing"></param>
101 protected override void Dispose(bool disposing)
102 {
103 IsDisposed = true;
104 base.Dispose(disposing);
105 }
106
107
108
109
110 /// <summary>
111 ///
112 /// </summary>
113 /// <param name="modelBuilder"></param>
114 protected override void OnModelCreating(DbModelBuilder modelBuilder)
115 {
116 modelBuilder.Conventions.Remove<PluralizingTableNameConvention>(); //去掉表名复数
117 modelBuilder.Entity<Employee>().Property(p => p.EmployeeID).HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.None);
118 }
119
120 }
121
122 /// <summary>
123 /// 默认数据库，当model变更时，重建创建
124 /// </summary>
125 public class Change_RecreateDb : System.Data.Entity.DropCreateDatabaseIfModelChanges<DataContext>
126 {
127
128 }
129 /// <summary>
130 /// 重新创建
131 /// </summary>
132 public class RecreateDb : System.Data.Entity.DropCreateDatabaseAlways<DataContext>
133 {
134
135 }
136 /// <summary>
137 /// 当数据库不存在时创建
138 /// </summary>
139 public class DefaultExistsDb : System.Data.Entity.CreateDatabaseIfNotExists<DataContext>
140 {
141
142 }
143
144
145 }
另外实体类在主键字段中，应该标识[Key]。不然在数据主键标识定义为非PK_xxx时，会提示主键错误
实体类定义示例：
1 /// <summary>
2 /// Employee
3 /// </summary>
4 public class Employee
5 {
6 private int _EmployeeID;
7 private int _ClientID;
8 private string _EmployeeCode;
9 private string _EmployeeName;
10 private string _EmployeePass;
11 private int _EmployeeStatus;
12 private int _RoleID;
13 private decimal _Timezone;
14 private string _TimezoneCode;
15 private int _Language;
16 private int _MainStatus;
17 private string _Mobile;
18 /// <summary>
19 ///
20 /// </summary>
21 public int EmployeeID
22 {
23 get
24 {
25 return _EmployeeID;
26 }
27 set
28 {
29 _EmployeeID = value;
30 }
31 }
32 /// <summary>
33 ///
34 /// </summary>
35 public int ClientID
36 {
37 get
38 {
39 return _ClientID;
40 }
41 set
42 {
43 _ClientID = value;
44 }
45 }
46 /// <summary>
47 ///
48 /// </summary>
49 public string EmployeeCode
50 {
51 get
52 {
53 return _EmployeeCode;
54 }
55 set
56 {
57 if (value == null)
58 {
59 _EmployeeCode = string.Empty;
60 }
61 else
62 {
63 _EmployeeCode = value;
64 }
65 }
66 }
67 /// <summary>
68 ///
69 /// </summary>
70 public string EmployeeName
71 {
72 get
73 {
74 return _EmployeeName;
75 }
76 set
77 {
78 if (value == null)
79 {
80 _EmployeeName = string.Empty;
81 }
82 else
83 {
84 _EmployeeName = value;
85 }
86 }
87 }
88 /// <summary>
89 ///
90 /// </summary>
91 public string EmployeePass
92 {
93 get
94 {
95 return _EmployeePass;
96 }
97 set
98 {
99 if (value == null)
100 {
101 _EmployeePass = string.Empty;
102 }
103 else
104 {
105 _EmployeePass = value;
106 }
107 }
108 }
109 /// <summary>
110 ///
111 /// </summary>
112 public int EmployeeStatus
113 {
114 get
115 {
116 return _EmployeeStatus;
117 }
118 set
119 {
120 _EmployeeStatus = value;
121 }
122 }
123 /// <summary>
124 ///
125 /// </summary>
126 public int RoleID
127 {
128 get
129 {
130 return _RoleID;
131 }
132 set
133 {
134 _RoleID = value;
135 }
136 }
137
138 /// <summary>
139 ///
140 /// </summary>
141 public decimal Timezone
142 {
143 get
144 {
145 return _Timezone;
146 }
147 set
148 {
149 _Timezone = value;
150 }
151 }
152 /// <summary>
153 ///
154 /// </summary>
155 public string TimezoneCode
156 {
157 get
158 {
159 return _TimezoneCode;
160 }
161 set
162 {
163 if (value == null)
164 {
165 _TimezoneCode = string.Empty;
166 }
167 else
168 {
169 _TimezoneCode = value;
170 }
171 }
172 }
173 /// <summary>
174 ///
175 /// </summary>
176 public int Language
177 {
178 get
179 {
180 return _Language;
181 }
182 set
183 {
184 _Language = value;
185 }
186 }
187 /// <summary>
188 ///
189 /// </summary>
190 public int MainStatus
191 {
192 get
193 {
194 return _MainStatus;
195 }
196 set
197 {
198 _MainStatus = value;
199 }
200 }
201 /// <summary>
202 ///
203 /// </summary>
204 public string Mobile
205 {
206 get
207 {
208 return _Mobile;
209 }
210 set
211 {
212 if (value == null)
213 {
214 _Mobile = string.Empty;
215 }
216 else
217 {
218 _Mobile = value;
219 }
220 }
221 }
222
223 }
仓储接口：
1 public interface IRepository<T> : IDisposable where T : class
2 {
3
4 /// <summary>
5 /// 添加实体
6 /// </summary>
7 /// <typeparam name="T"></typeparam>
8 /// <param name="Entity"></param>
9 /// <returns></returns>
10 bool Add(T Entity) ;
11
12 /// <summary>
13 /// 批量的进行添加实体
14 /// </summary>
15 /// <typeparam name="T"></typeparam>
16 /// <param name="Entity"></param>
17 /// <returns></returns>
18 bool AddRange(List<T> Entity);
19
20
21 /// <summary>
22 /// 删除单个实体
23 /// </summary>
24 /// <typeparam name="T"></typeparam>
25 /// <param name="Entity"></param>
26 /// <returns></returns>
27 bool Delete(T Entity);
28
29 /// <summary>
30 /// 根据查询条件进行删除单个实体
31 /// </summary>
32 /// <typeparam name="T"></typeparam>
33 /// <param name="whereLambda"></param>
34 /// <returns></returns>
35 bool Delete(Expression<Func<T, bool>> whereLambda);
36
37
38 /// <summary>
39 ///单个对象的修改
40 /// </summary>
41 /// <typeparam name="T"></typeparam>
42 /// <param name="Entity">需要修改的对象</param>
43 /// <returns></returns>
44 bool Update(T Entity);
45
46
47 /// <summary>
48 /// 批量修改
49 /// </summary>
50 /// <typeparam name="T"></typeparam>
51 /// <param name="whereLambda"></param>
52 /// <param name="updateLambda"></param>
53 /// <returns></returns>
54 bool Update(Expression<Func<T, bool>> WhereLambda, Expression<Func<T, T>> UpdateLambda) ;
55
56
57 /// <summary>
58 /// 批量的修改
59 /// </summary>
60 /// <typeparam name="T"></typeparam>
61 /// <param name="Entity"></param>
62 /// <returns></returns>
63 bool Update(List<T> Entity) ;
64
65
66 /// <summary>
67 /// 批量统一的进行更新
68 /// </summary>
69 /// <typeparam name="T"></typeparam>
70 /// <param name="model">需要修改的对象实体</param>
71 /// <param name="WhereLambda">查询的条件</param>
72 /// <param name="ModifiedProNames"></param>
73 /// <returns></returns>
74 bool Update(T model, Expression<Func<T, bool>> WhereLambda, params string[] ModifiedProNames) ;
75
76
77 /// <summary>
78 /// 根据主键进行查询
79 /// </summary>
80 /// <typeparam name="T"></typeparam>
81 /// <param name="ID"></param>
82 /// <returns></returns>
83 T FindByID(dynamic ID) ;
84
85 /// <summary>
86 /// 默认查询选择第一条数据,没有那么进行返回NULL
87 /// </summary>
88 /// <typeparam name="T"></typeparam>
89 /// <param name="WhereLambda"></param>
90 /// <returns>返回bool</returns>
91 T GetFristDefault(Expression<Func<T, bool>> WhereLambda = null) ;
92
93 /// <summary>
94 /// 查询所有的数据
95 /// </summary>
96 /// <typeparam name="T"></typeparam>
97 /// <returns></returns>
98 List<T> GetAll(string Order = null) ;
99
100 /// <summary>
101 /// 含有带条件的查询
102 /// </summary>
103 /// <typeparam name="T"></typeparam>
104 /// <param name="WhereLambda"></param>
105 /// <returns></returns>
106 List<T> GetAllQuery(Expression<Func<T, bool>> WhereLambda = null) ;
107
108
109 /// <summary>
110 ///获取查询的数量
111 /// </summary>
112 /// <typeparam name="T"></typeparam>
113 /// <param name="WhereLambda"></param>
114 /// <returns></returns>
115 int GetCount(Expression<Func<T, bool>> WhereLambda = null);
116
117 /// <summary>
118 /// 判断对象是否存在
119 /// </summary>
120 /// <typeparam name="T"></typeparam>
121 /// <param name="WhereLambda"></param>
122 /// <returns></returns>
123 bool GetAny(Expression<Func<T, bool>> WhereLambda = null);
124
125
126 /// <summary>
127 /// 根据查询过条件进行分页
128 /// </summary>
129 /// <typeparam name="T"></typeparam>
130 /// <typeparam name="TKey"></typeparam>
131 /// <param name="PageIndex">当前页面</param>
132 /// <param name="PageSize">页面的大小</param>
133 /// <param name="TotalCount">总记录数</param>
134 /// <param name="OrderBy">排序的条件</param>
135 /// <param name="WhereLambda">查询条件</param>
136 /// <param name="IsOrder">是否正序</param>
137 /// <returns></returns>
138 List<T> Pagination<TKey>(int PageIndex, int PageSize, out int TotalCount, Expression<Func<T, TKey>> OrderBy, Expression<Func<T, bool>> WhereLambda = null, bool IsOrder = true) ;
139
140
141 /// <summary>
142 /// 根据查询条件进行做分页查询
143 /// </summary>
144 /// <typeparam name="T">查询的对象</typeparam>
145 /// <param name="PageIndex">当前的页码</param>
146 /// <param name="PageSize">每页的大小</param>
147 /// <param name="TotalCount">总页数</param>
148 /// <param name="ordering">排序条件</param>
149 /// <param name="WhereLambda">查询条件</param>
150 /// <returns></returns>
151 List<T> Pagination(int PageIndex, int PageSize, out int TotalCount, string ordering, Expression<Func<T, bool>> WhereLambda = null) ;
152
153
154 /// <summary>
155 /// 根据查询条件进行转化
156 /// </summary>
157 /// <typeparam name="T"></typeparam>
158 /// <param name="WhereLambda"></param>
159 /// <returns></returns>
160 List<T> GetSelect(Expression<Func<T, bool>> WhereLambda) ;
161
162
163 /// <summary>
164 /// 执行存储过程或自定义sql语句--返回集合
165 /// </summary>
166 /// <typeparam name="T"></typeparam>
167 /// <param name="Sql"></param>
168 /// <param name="Parms"></param>
169 /// <param name="CmdType"></param>
170 /// <returns></returns>
171 List<T> QueryProc(string Sql, List<MySqlParameter> Parms, CommandType CmdType = CommandType.Text) ;
172
173
174 /// <summary>
175 /// 回滚
176 /// </summary>
177 /// <typeparam name="T"></typeparam>
178 void RollBackChanges() ;
179
180
181 }
仓储代码：
1 /// <summary>
2 ///
3 /// </summary>
4 public class Repository<T> : IRepository<T>, IDisposable where T : class
5 {
6 private string _ConnectionString = "Server=127.0.0.1,1433;database=MarketDB;uid=sa;pwd=123456";
7 /// <summary>
8 ///
9 /// </summary>
10 private DbContext _DbContextHandle = new DataContext(@"Server=127.0.0.1,1433;database=MarketDB;uid=sa;pwd=123456");//此处进行调用EF的DBContext的实体类或者通过工厂化模式来进行调用。
11
12 public Repository()
13 {
14 }
15 public Repository(string connectionString)
16 {
17 if (string.IsNullOrEmpty(connectionString))
18 {
19 throw new ArgumentNullException("Connection String");
20 }
21 else
22 {
23 this._ConnectionString = connectionString;
24 _DbContextHandle = new DbContext(connectionString);
25 }
26 }
27 /// <summary>
28 /// 添加一个对象
29 /// </summary>
30 /// <typeparam name="T"></typeparam>
31 /// <param name="Entity"></param>
32 /// <returns></returns>
33 public bool Add(T Entity)
34 {
35 using (TransactionScope trans = new TransactionScope(TransactionScopeOption.Required))
36 {
37 T t = _DbContextHandle.Set<T>().Add(Entity);
38 int Count = _DbContextHandle.SaveChanges();
39 trans.Complete();
40 return Count > 0;
41 }
42 }
43
44 /// <summary>
45 /// 批量的插入数据
46 /// </summary>
47 /// <typeparam name="T"></typeparam>
48 /// <param name="Entity"></param>
49 /// <returns></returns>
50 public bool AddRange(List<T> Entity)
51 {
52 using (TransactionScope trans = new TransactionScope(TransactionScopeOption.Required))
53 {
54 _DbContextHandle.Set<T>().AddRange(Entity);
55 int Count = _DbContextHandle.SaveChanges();
56 trans.Complete();
57 return Count > 0;
58 }
59 }
60
61 /// <summary>
62 /// 根据查询条件进行删除对象
63 /// </summary>
64 /// <typeparam name="T"></typeparam>
65 /// <param name="whereLambda">查询条件</param>
66 /// <returns></returns>
67 public bool Delete(Expression<Func<T, bool>> whereLambda)
68 {
69 using (TransactionScope trans = new TransactionScope(TransactionScopeOption.Required))
70 {
71 var EntityModel = _DbContextHandle.Set<T>().Where(whereLambda).FirstOrDefault();
72 if (EntityModel != null)
73 {
74 _DbContextHandle.Set<T>().Remove(EntityModel);
75 int Count = _DbContextHandle.SaveChanges();
76 trans.Complete();
77 return Count > 0;
78 }
79 return false;
80 }
81 }
82
83
84 /// <summary>
85 /// 删除单个对象的实体
86 /// </summary>
87 /// <typeparam name="T"></typeparam>
88 /// <param name="Entity">实体对象</param>
89 /// <returns></returns>
90 public bool Delete(T Entity)
91 {
92 using (TransactionScope trans = new TransactionScope(TransactionScopeOption.Required))
93 {
94 _DbContextHandle.Set<T>().Attach(Entity);
95 _DbContextHandle.Set<T>().Remove(Entity);
96 int Count = _DbContextHandle.SaveChanges();
97 trans.Complete();
98 return Count > 0;
99 }
100 }
101
102 /// <summary>
103 /// 批量的进行更新数据
104 /// </summary>
105 /// <typeparam name="T"></typeparam>
106 /// <param name="Entity"></param>
107 /// <returns></returns>
108 public bool Update(List<T> Entity)
109 {
110 int Count = 0;
111 using (TransactionScope trans = new TransactionScope(TransactionScopeOption.Required))
112 {
113 if (Entity != null)
114 {
115 foreach (var items in Entity)
116 {
117 var EntityModel = _DbContextHandle.Entry(Entity);
118 _DbContextHandle.Set<T>().Attach(items);
119 EntityModel.State = EntityState.Modified;
120 }
121 }
122 Count = _DbContextHandle.SaveChanges();
123 trans.Complete();
124 }
125
126 return Count > 0;
127 }
128
129
130 /// <summary>
131 /// 进行修改单个实体对象
132 /// </summary>
133 /// <typeparam name="T"></typeparam>
134 /// <param name="Entity">实体对象</param>
135 /// <returns></returns>
136 public bool Update(T Entity)
137 {
138 using (TransactionScope trans = new TransactionScope())
139 {
140 var EntityModel = _DbContextHandle.Entry<T>(Entity);
141 _DbContextHandle.Set<T>().Attach(Entity);
142 EntityModel.State = EntityState.Modified;
143 int Count = _DbContextHandle.SaveChanges();
144 trans.Complete();
145 return Count > 0;
146 }
147 }
148
149 /// <summary>
150 /// 批量的修改
151 /// </summary>
152 /// <typeparam name="T"></typeparam>
153 /// <param name="WhereLambda"></param>
154 /// <param name="UpdateLambda"></param>
155 /// <returns></returns>
156 public bool Update(Expression<Func<T, bool>> WhereLambda, Expression<Func<T, T>> UpdateLambda)
157 {
158 //_DbContextHandle.Set<T>().Where(WhereLambda).Update<T>(UpdateLambda);
159 //return _DbContextHandle.SaveChanges() > 0;
160 return false;
161 }
162
163
164 /// <summary>
165 /// 查询条件进行修改
166 /// </summary>
167 /// <typeparam name="T"></typeparam>
168 /// <param name="model"></param>
169 /// <param name="WhereLambda"></param>
170 /// <param name="ModifiedProNames"></param>
171 /// <returns></returns>
172 public bool Update(T model, Expression<Func<T, bool>> WhereLambda, params string[] ModifiedProNames)
173 {
174 //查询要修改的数据
175 List<T> ListModifing = _DbContextHandle.Set<T>().Where(WhereLambda).ToList();
176 Type t = typeof(T);
177 List<PropertyInfo> ProInfos = t.GetProperties(BindingFlags.Instance | BindingFlags.Public).ToList();
178 Dictionary<string, PropertyInfo> DitProList = new Dictionary<string, PropertyInfo>();
179 ProInfos.ForEach(p =>
180 {
181 if (ModifiedProNames.Contains(p.Name))
182 {
183 DitProList.Add(p.Name, p);
184 }
185 });
186
187 if (DitProList.Count <= 0)
188 {
189 throw new Exception("指定修改的字段名称有误或为空");
190 }
191 foreach (var item in DitProList)
192 {
193 PropertyInfo proInfo = item.Value;
194 object newValue = proInfo.GetValue(model, null);
195 //批量进行修改相互对应的属性
196 foreach (T oModel in ListModifing)
197 {
198 proInfo.SetValue(oModel, newValue, null);//设置其中新的值
199 }
200 }
201
202 return _DbContextHandle.SaveChanges() > 0;
203 }
204 /// <summary>
205 /// 释放缓存
206 /// </summary>
207 public void Dispose()
208 {
209 _DbContextHandle.Dispose();
210 }
211
212 /// <summary>
213 /// 查询单个对象
214 /// </summary>
215 /// <typeparam name="T"></typeparam>
216 /// <param name="ID">主键ID</param>
217 /// <returns></returns>
218 public T FindByID(dynamic ID)
219 {
220 DbSet<T> db = _DbContextHandle.Set<T>();
221 var result =db.Find(ID);
222 return result;
223
224 //return _DbContextHandle.Set<T>().Find(ID) ?? null;
225 }
226
227
228 /// <summary>
229 /// 获取全部数据的列表
230 /// </summary>
231 /// <typeparam name="T"></typeparam>
232 /// <param name="Order">排序</param>
233 /// <returns></returns>
234 public List<T> GetAll(string orderString = "")
235 {
236 if (string.IsNullOrEmpty(orderString))
237 {
238 return _DbContextHandle.Set<T>().ToList();
239 }
240 else
241 {
242 return null; // _DbContextHandle.Set<T>().OrderBy(orderString).ToList();
243 }
244 }
245
246 /// <summary>
247 ///根据查询条件进行查询列表
248 /// </summary>
249 /// <typeparam name="T"></typeparam>
250 /// <param name="WhereLambda"></param>
251 /// <returns></returns>
252 public List<T> GetAllQuery(Expression<Func<T, bool>> WhereLambda = null)
253 {
254 return WhereLambda != null ? _DbContextHandle.Set<T>().Where(WhereLambda).ToList() ?? null : _DbContextHandle.Set<T>().ToList() ?? null;
255 }
256
257 /// <summary>
258 ///判断对象是否存在
259 /// </summary>
260 /// <typeparam name="T"></typeparam>
261 /// <param name="WhereLambda"></param>
262 /// <returns></returns>
263 public bool GetAny(Expression<Func<T, bool>> WhereLambda = null)
264 {
265 return WhereLambda != null ? _DbContextHandle.Set<T>().Where(WhereLambda).Any() : _DbContextHandle.Set<T>().Any();
266 }
267
268 /// <summary>
269 /// 获取查询条件的记录数
270 /// </summary>
271 /// <typeparam name="T"></typeparam>
272 /// <param name="WhereLambda"></param>
273 /// <returns></returns>
274 public int GetCount(Expression<Func<T, bool>> WhereLambda = null)
275 {
276 return WhereLambda != null ? _DbContextHandle.Set<T>().Where(WhereLambda).Count() : _DbContextHandle.Set<T>().Count();
277 }
278
279
280 /// <summary>
281 /// 获取单条的记录
282 /// </summary>
283 /// <typeparam name="T"></typeparam>
284 /// <param name="WhereLambda"></param>
285 /// <returns></returns>
286 public T GetFristDefault(Expression<Func<T, bool>> WhereLambda = null)
287 {
288 return WhereLambda != null ? _DbContextHandle.Set<T>().Where(WhereLambda).FirstOrDefault() ?? null : _DbContextHandle.Set<T>().FirstOrDefault() ?? null;
289 }
290
291
292 /// <summary>
293 /// 查询对象的转化
294 /// </summary>
295 /// <typeparam name="T"></typeparam>
296 /// <param name="WhereLambda"></param>
297 /// <returns></returns>
298 public List<T> GetSelect(Expression<Func<T, bool>> WhereLambda)
299 {
300 return _DbContextHandle.Set<T>().Where(WhereLambda).ToList() ?? null;
301 }
302
303 /// <summary>
304 ///根据查询条件进行分页
305 /// </summary>
306 /// <typeparam name="T"></typeparam>
307 /// <param name="PageIndex">当前页</param>
308 /// <param name="PageSize">每页的大小</param>
309 /// <param name="TotalCount">总记录数</param>
310 /// <param name="ordering">排序条件</param>
311 /// <param name="WhereLambda">查询条件</param>
312 /// <returns></returns>
313 public List<T> Pagination(int PageIndex, int PageSize, out int TotalCount, string Ordering, Expression<Func<T, bool>> WhereLambda = null)
314 {
315 //分页的时候一定要注意 Order 一定在Skip 之前
316 //var QueryList = _DbContextHandle.Set<T>().OrderBy(Ordering);
317 //if (WhereLambda != null)
318 //{
319 // QueryList = QueryList.Where(WhereLambda);
320 //}
321
322 //TotalCount = QueryList.Count();
323 //return QueryList.Skip(PageSize * (PageIndex - 1)).Take(PageSize).ToList() ?? null;
324 TotalCount = 0;
325 return null;
326 }
327
328 /// <summary>
329 ///根据查询条件进行分页
330 /// </summary>
331 /// <typeparam name="T"></typeparam>
332 /// <param name="PageIndex">当前页</param>
333 /// <param name="PageSize">每页的大小</param>
334 /// <param name="TotalCount">总记录数</param>
335 /// <param name="OrderBy">排序条件</param>
336 /// <param name="WhereLambda">查询的条件</param>
337 /// <param name="IsOrder"></param>
338 /// <returns></returns>
339 public List<T> Pagination<TKey>(int PageIndex, int PageSize, out int TotalCount, Expression<Func<T, TKey>> OrderBy, Expression<Func<T, bool>> WhereLambda = null, bool IsOrder = true)
340 {
341 //分页的时候一定要注意 Order一定在Skip 之前
342 IQueryable<T> QueryList = IsOrder == true ? _DbContextHandle.Set<T>().OrderBy(OrderBy) : _DbContextHandle.Set<T>().OrderByDescending(OrderBy);
343
344 if (WhereLambda != null)
345 {
346 QueryList = QueryList.Where(WhereLambda);
347 }
348
349 TotalCount = QueryList.Count();
350 return QueryList.Skip(PageSize * (PageIndex - 1)).Take(PageSize).ToList() ?? null;
351 }
352
353
354 /// <summary>
355 /// 执行存储过程的SQL 语句
356 /// </summary>
357 /// <typeparam name="T"></typeparam>
358 /// <param name="Sql">执行的SQL语句</param>
359 /// <param name="Parms">SQL 语句的参数</param>
360 /// <param name="CmdType"></param>
361 /// <returns></returns>
362 public List<T> QueryProc(string Sql, List<MySqlParameter> Parms, CommandType CmdType = CommandType.Text)
363 {
364 //进行执行存储过程
365 if (CmdType == CommandType.StoredProcedure)
366 {
367 StringBuilder paraNames = new StringBuilder();
368 foreach (var item in Parms)
369 {
370 paraNames.Append(string.Format(" @{item},", item));
371 }
372 Sql = paraNames.Length > 0 ? string.Format("exec {Sql} {paraNames.ToString().Trim(',')}", Sql) : string.Format("exec {Sql} ", Sql);
373 }
374 return _DbContextHandle.Set<T>().SqlQuery(Sql, Parms.ToArray()).ToList();
375 }
376
377
378 /// <summary>
379 /// 进行回滚
380 /// </summary>
381 /// <typeparam name="T"></typeparam>
382 public void RollBackChanges()
383 {
384 var Query = _DbContextHandle.ChangeTracker.Entries().ToList();
385
386 Query.ForEach(p => p.State = EntityState.Unchanged);
387 }
388
389 }
调用示例：
1 /// <summary>
2 ///
3 /// </summary>
4 /// <param name="employeeCode"></param>
5 /// <returns></returns>
6 public Employee GetEmployee(string employeeCode)
7 {
8 if(string.IsNullOrEmpty(employeeCode))
9 {
10 return null;
11 }
12 Repository<Employee> employeeRepository = new Repository<Employee>();
13 Employee emp = employeeRepository.GetFristDefault(p => p.EmployeeCode == employeeCode);
14 return emp;
15 }
附加自定义查询返回DataSet：
1 public class BaseSqlDal
2 {
3
4 //private string _ConnectionString = "Server=127.0.0.1,1433;database=MarketDB;uid=sa;pwd=123456";
5 /// <summary>
6 ///
7 /// </summary>
8 private DbContext _DbContextHandle = new DataContext(@"Server=127.0.0.1,1433;database=MarketDB;uid=sa;pwd=123456");//此处进行调用EF的DBContext的实体类或者通过工厂化模式来进行调用。
9
10 public List<T> Query<T>(string cmdString) where T : class
11 {
12 return _DbContextHandle.Database.SqlQuery<T>(cmdString).ToList();
13 }
14 public List<T> Query<T>(string cmdString, params object[] parameters) where T : class
15 {
16
17 return _DbContextHandle.Database.SqlQuery<T>(cmdString, parameters).ToList();
18 }
19 /// <summary>
20 ///
21 /// </summary>
22 /// <param name="cmdString"></param>
23 /// <param name="dicParameter"></param>
24 /// <param name="sqlDbType"></param>
25 /// <returns></returns>
26 public DataSet QueryDataSet(string cmdString, Dictionary<string, object> dicParameter, SqlDbType sqlDbType)
27 {
28 DataSet ds = new DataSet();
29 SqlConnection connection = _DbContextHandle.Database.Connection as SqlConnection;
30 SqlCommand cmd = new SqlCommand(cmdString, connection);
31 return ds;
32 }
33 }
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