EF 底层基础方法
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 | 1 using System; 2 using System.Data; 3 using System.Collections.Generic; 4 using System.Data.Entity; 5 using System.Linq; 6 using System.Linq.Expressions; 7 using System.Text; 8 using System.Threading.Tasks; 9 using SchoolDAL.Context; 10 using SchoolDAL.Entity; 11 using System.Data.Entity.Infrastructure; 12 using System.Data.SqlClient; 13 using EntityFramework.Extensions; 14 using System.Reflection; 15 namespace SchoolDAL 16 { 17 18 public class BaseDAL 19 { 20 21 public DbContext Context; 22 23 public BaseDAL(DbContext context) 24 { 25 Context = context; 26 }<br> //得到实体的数量 根据条件 27 public int GetModelCount<TEntity>(Expression<Func<TEntity, bool >> filterList) where TEntity : class 28 { 29 return FindByItem(filterList).Count(); 30 } 31 //根据单个条件得到实体的集合 32 public List<TEntity> FindModelList<TEntity>(Expression<Func<TEntity, bool >> filterList, int currPage, int size, out int Total) where TEntity : class 33 { 34 List<TEntity> list= new List<TEntity>(); 35 var json = FindByItem(filterList); 36 try 37 { 38 Total = json.Count(); 39 list = json.Skip(currPage).Take(size).ToList(); // only support order by Id asc 40 } 41 catch 42 { 43 Total = 0; 44 } 45 return list; 46 } 47 //根据条件得到集合 48 public TEntity FindModel<TEntity>(Expression<Func<TEntity, bool >> filterList) where TEntity : class 49 { 50 return FindByItem(filterList).FirstOrDefault(); 51 } 52 //根据多个条件得到实体数据源 53 public IQueryable<TEntity> FindByItem<TEntity>(List<Expression<Func<TEntity, bool >>> filterList) where TEntity : class 54 { 55 var json = Context.Set<TEntity>().Where(t => true ); 56 foreach ( var item in filterList) 57 { 58 json = json.Where(item); 59 } 60 return json; 61 } 62 //根据单个条件得到数据源 63 public IQueryable<TEntity> FindByItem<TEntity>(Expression<Func<TEntity, bool >> filterList) where TEntity : class 64 { 65 var json = Context.Set<TEntity>().Where(filterList); 66 67 return json; 68 } 69 //单个增加 70 public bool Create<TEntity>(TEntity TObject) where TEntity : class 71 { 72 try 73 { 74 Context.Set<TEntity>().Add(TObject); 75 Context.SaveChanges(); 76 return true ; 77 } 78 catch (Exception ex) 79 { 80 return false ; 81 } 82 } 83 //单个修改 84 public bool Edit<TEntity>(TEntity TObject) where TEntity : class 85 { 86 try 87 { 88 var entry = Context.Entry(TObject); 89 Context.Set<TEntity>().Attach(TObject); 90 entry.State = EntityState.Modified; 91 Context.SaveChanges(); 92 return true ; 93 } 94 catch 95 { 96 //throw ex; 97 return false ; 98 } 99 } 100 //单个删除 101 public void Delete<TEntity>(TEntity TObject) where TEntity : class 102 { 103 try 104 { 105 Context.Set<TEntity>().Remove(TObject); 106 Context.SaveChanges(); 107 108 } 109 catch (Exception ex) 110 { 111 112 } 113 114 } 115 116 //批量修改 117 public int BulkUpdate<TEntity>(List<Expression<Func<TEntity, bool >>> filterList, Expression<Func<TEntity, TEntity>> UpdatedModel) where TEntity : class 118 { 119 int res = 0; 120 var json = FindByItem(filterList); 121 using ( var tran = Context.Database.BeginTransaction()) 122 { 123 try 124 { 125 res = Context.Set<TEntity>().Update(json, UpdatedModel); 126 tran.Commit(); 127 } 128 catch 129 { 130 tran.Rollback(); 131 } 132 } 133 return res; 134 } 135 //批量删除 136 public int BulkDelete<TEntity>(List<Expression<Func<TEntity, bool >>> filterList) where TEntity : class 137 { 138 int res=0; 139 var json = FindByItem(filterList); 140 using ( var tran= Context.Database.BeginTransaction()) 141 { 142 try 143 { 144 res= Context.Set<TEntity>().Delete(json); 145 tran.Commit(); 146 } 147 catch 148 { 149 tran.Rollback(); 150 } 151 } 152 return res; 153 154 } 155 //批量创建 156 public void BulkCreate<TEntity>(List<TEntity> list, string tableName) where TEntity : class 157 { 158 159 DataTable dt = new DataTable(); 160 Type type = typeof (TEntity); 161 PropertyInfo[] propes = type.GetProperties(); 162 foreach ( var prop in propes) 163 { 164 dt.Columns.Add(prop.Name); 165 } 166 foreach ( var entity in list) 167 { 168 DataRow row = dt.NewRow(); 169 foreach (DataColumn col in dt.Columns) 170 { 171 foreach ( var prop in propes) 172 { 173 if (!col.ColumnName.Equals( "id" , StringComparison.InvariantCultureIgnoreCase)) 174 { 175 if (prop.Name.Equals(col.ColumnName, StringComparison.InvariantCultureIgnoreCase)) 176 row[col.ColumnName] = prop.GetValue(entity); 177 } 178 } 179 180 } 181 dt.Rows.Add(row); 182 } 183 if (dt != null && dt.Rows.Count > 0) 184 { 185 using ( var tran = Context.BeginTransaction()) 186 { 187 try 188 { 189 using (SqlBulkCopy sqlBulkCopy = new SqlBulkCopy(Context.Database.Connection.ConnectionString)) 190 { 191 sqlBulkCopy.BatchSize = 10000; 192 sqlBulkCopy.BulkCopyTimeout = 12000; 193 sqlBulkCopy.DestinationTableName = string .Format( "dbo.{0}" , tableName); 196 for ( int i = 1; i < dt.Columns.Count; i++) 197 { 198 sqlBulkCopy.ColumnMappings.Add(i, i); 199 } 201 sqlBulkCopy.WriteToServer(dt); 202 tran.Commit(); 203 } 204 } 205 catch (Exception e) 206 { 207 tran.Rollback(); 208 } 209 } 210 211 } 212 213 } 214 215 public SchoolContext GetContext() 216 { 217 return new SchoolContext(); 218 } 219 220 public void DisposeContext(SchoolContext db) 221 { 222 if (db != null ) 223 db.Dispose(); 224 } 225 //绑定实体 226 public DbEntityEntry<TEntity> EditEntry<TEntity>(TEntity TObject) where TEntity : class 227 { 228 var entry = Context.Entry(TObject); 229 Context.Set<TEntity>().Attach(TObject); 230 entry.State = EntityState.Modified; 231 return entry; 232 } 233 //执行存储过程 234 public List<TEntity> ExecuteByStoreProcedure<TEntity>( string ExecuteProcedure,SqlParameter[] parms) where TEntity : class 235 { 236 List<SqlParameter> parmList = new List<SqlParameter>(); 237 245 var list = Context.Database.SqlQuery<TEntity>(ExecuteProcedure, parms); 246 var enityList = list.ToList(); 247 248 return enityList; 249 250 } 251 252 } 253 } |
1 | 上面方法包括常见的增删改查,多条件查询,批量删除和修改,以及对存储过程的支持。其中BulkDelete 和BulkUpdate 依赖于EntityFramework.Extensions的类库,这个类库必须通过Nuget安装 链接地址:https: //www.nuget.org/packages/EntityFramework.Extended 注意你的Ef版本。 |
posted @ 2014-08-08 09:30 Richard__Lee 阅读(426) 评论(0) 推荐(0) 编辑