EF 增删改查 泛型方法、类
1.定义泛型类
namespace Crm.Data.Logic.Repository
{
public abstract class AbstractRepository<TC, T> : IDisposable
where TC : DbContext, new()
where T : class
{
private TC _entities = new TC();
private bool _disposed;
protected TC Context
{
get
{
return _entities;
}
set
{
_entities = value;
}
}
public virtual IQueryable<T> All
{
get
{
return GetAll();
}
}
public virtual IQueryable<T> AllIncluding(params Expression<Func<T, object>>[] includeProperties)
{
IQueryable<T> queryable = _entities.Set<T>();
return includeProperties.Aggregate(queryable, (current, expression) => current.Include(expression));
}
public virtual IQueryable<T> GetAll()
{
return _entities.Set<T>();
}
public virtual T Find(params object[] keyValues)
{
return _entities.Set<T>().Find(keyValues);
}
public virtual IQueryable<T> FindBy(Expression<Func<T, bool>> predicate)
{
return _entities.Set<T>().Where(predicate);
}
public virtual void Add(T entity)
{
_entities.Set<T>().Add(entity);
}
public virtual void BulkInsert(List<T> list)
{
var tblName = typeof(T).Name;
BulkInsert(_entities.Database.Connection.ConnectionString, tblName, list);
}
public static void BulkInsert(string connection, string tableName, IList<T> list)
{
using (var bulkCopy = new SqlBulkCopy(connection))
{
bulkCopy.BatchSize = list.Count;
bulkCopy.DestinationTableName = tableName;
var table = new DataTable();
var props = TypeDescriptor.GetProperties(typeof(T))
//Dirty hack to make sure we only have system data types
//i.e. filter out the relationships/collections
.Cast<PropertyDescriptor>()
.Where(propertyInfo => propertyInfo.PropertyType.Namespace != null
&& propertyInfo.PropertyType.Namespace.Equals("System"))
.ToArray();
foreach (var propertyInfo in props)
{
bulkCopy.ColumnMappings.Add(propertyInfo.Name, propertyInfo.Name);
table.Columns.Add(propertyInfo.Name, Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType);
}
var values = new object[props.Length];
foreach (var item in list)
{
for (var i = 0; i < values.Length; i++)
{
values[i] = props[i].GetValue(item);
}
table.Rows.Add(values);
}
bulkCopy.WriteToServer(table);
}
}
public virtual void Delete(T entity)
{
_entities.Set<T>().Remove(entity);
}
public virtual void Edit(T entity)
{
_entities.Entry(entity).State = (EntityState.Modified);
}
public virtual void Upsert(T entity, Func<T, bool> insertExpression)
{
if (insertExpression(entity))
{
Add(entity);
}
else
{
Edit(entity);
}
}
public virtual void Save()
{
_entities.SaveChanges();
}
public virtual DataTable PageQuery(int page, int pageSize,
string sort, string where, out int total)
{
var viewName = typeof (T).Name;
var paras = new List<SqlParameter>
{
new SqlParameter("tblName", "dbo."+viewName),
new SqlParameter("fldName", "*"),
new SqlParameter("pageSize", pageSize),
new SqlParameter("page", page),
new SqlParameter("fldSort", sort),
new SqlParameter("strCondition", where),
new SqlParameter("pageCount", SqlDbType.Int){Direction = ParameterDirection.Output},
};
var countParameter = new SqlParameter
{
ParameterName = "counts",
SqlDbType = SqlDbType.Int,
Direction = ParameterDirection.Output
};
var strParameter = new SqlParameter("strSql", SqlDbType.NVarChar, 4000) { Direction = ParameterDirection.Output };
paras.Add(countParameter);
paras.Add(strParameter);
var conn = _entities.Database.Connection.ConnectionString;
var ds = SqlHelper.ExecuteDataset(conn, CommandType.StoredProcedure,
"dbo.PagedQuery", paras.ToArray());
total = countParameter.Value == DBNull.Value ? 0 : Convert.ToInt32(countParameter.Value);
return ds.Tables[0];
}
public virtual List<T> PageQueryList(int page, int pageSize,
string sort, string where, out int total)
{
var viewName = typeof(T).Name;
var paras = new List<SqlParameter>
{
new SqlParameter("tblName", "dbo."+viewName),
new SqlParameter("fldName", "*"),
new SqlParameter("pageSize", pageSize),
new SqlParameter("page", page),
new SqlParameter("fldSort", sort),
new SqlParameter("strCondition", where),
new SqlParameter("pageCount", SqlDbType.Int){Direction = ParameterDirection.Output},
};
var countParameter = new SqlParameter
{
ParameterName = "counts",
SqlDbType = SqlDbType.Int,
Direction = ParameterDirection.Output
};
var strParameter = new SqlParameter("strSql", SqlDbType.NVarChar, 4000) { Direction = ParameterDirection.Output };
paras.Add(countParameter);
paras.Add(strParameter);
//var conn = _entities.Database.Connection.ConnectionString;
//var ds = SqlHelper.ExecuteDataset(conn, CommandType.StoredProcedure,
// "dbo.PagedQuery", paras.ToArray());
//total = countParameter.Value == DBNull.Value ? 0 : Convert.ToInt32(countParameter.Value);
var ret =_entities.Database.SqlQuery<T>(
"dbo.PagedQuery @tblName,@fldName,@pageSize,@page,@fldSort,@strCondition,@pageCount out,@counts out,@strSql out",
paras.ToArray()).ToList();
total = countParameter.Value == DBNull.Value ? 0 : Convert.ToInt32(countParameter.Value);
return ret;
}
protected virtual void Dispose(bool disposing)
{
if (!_disposed && disposing)
{
_entities.Dispose();
}
_disposed = true;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
}
}
2. 具体类继承泛型类
namespace Crm.Data.Logic.Logic
{
public class CrmDispatchLogic:AbstractRepository<LifeEntities,Crm_Dispatch>
{
}
}
3. 使用具体类
var dispatchSvc = new CrmDispatchLogic();
var dispatchModel = dispatchSvc.GetAll().FirstOrDefault(m => m.Handler == opId
&& m.IsUse == 1);
if (dispatchModel != null)
{}
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