这个类是真正的数据库操作类，上面的那个类只是调用了这个封装类的方法进行的操作
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;
using System.Data.Entity;
using System.Data.Linq;
using System.Data.Objects;
using System.Reflection;
using System.Threading;
using System.Data;
using System.Data.Objects.DataClasses;
using JFrame.Utility;
namespace JFrame.AccessCommon
{
public class DataCommon
{
static readonly string Connection = "name=EntitiesContainer";
static readonly string ContainerName = "EntitiesContainer";
ObjectContext entities;
public DataCommon(string Connection, string ContainerName = "EntitiesContainer")
{
entities = new ObjectContext(Connection);
entities.DefaultContainerName = ContainerName;
}
//POMonitorDBEntities entities = new ENTITY.POMonitorDBEntities(Connection);
#region 根据SQL语句查询数据
public IEnumerable<T> ExecuteQuery<T>(string conn, string query, params object[] parms)
{
try
{
if (string.IsNullOrEmpty(conn))
{
return entities.ExecuteStoreQuery<T>(query, parms);
}
else
{
DataContext myDC = new DataContext(conn);
return myDC.ExecuteQuery<T>(query, parms);
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
public IEnumerable<T> ExecuteQuery<T>(string query)
{
return ExecuteQuery<T>(string.Empty, query, new object[] { });
}
#endregion
#region 执行操作类型SQl语句
/// <summary>
/// 执行SQL命令
/// </summary>
/// <param name="sqlCommand"></param>
/// <returns></returns>
public int ExecuteSqlCommand(string sqlCommand, string connection = null)
{
if (string.IsNullOrEmpty(connection))
return entities.ExecuteStoreCommand(sqlCommand); //ExecuteCommand(sqlCommand);
else
{
ObjectContext entitiesNew = new ObjectContext(connection);
return entitiesNew.ExecuteStoreCommand(sqlCommand);
}
}
/// <summary>
/// 执行SQL命令
/// </summary>
/// <param name="sqlCommand"></param>
/// <returns></returns>
public void ExecuteSqlCommand(string sqlCommand)
{
ExecuteSqlCommand(connection: string.Empty, sqlCommand: sqlCommand);
}
#endregion
#region 私有方法
private ObjectSet<T> GetTable<T>() where T : class
{
try
{
ObjectSet<T> customers = entities.CreateObjectSet<T>();
return customers;
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
#region 统计指定条件的数据量
/// <summary>
/// 统计指定条件的数据量
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="query"></param>
/// <returns></returns>
public virtual int Count<T>(Expression<Func<T, bool>> query) where T : class
{
var table = GetTable<T>();
return (from t in table
select t).Where(query).Count();
}
#endregion
#region 获取单个实体
/// <summary>
/// 获取单个实体
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="express">查询条件</param>
/// <returns></returns>
public virtual T GetSingleEntity<T>(Expression<Func<T, bool>> query) where T : class
{
try
{
var table = GetTable<T>();
return (from t in table
select t).Where(query).SingleOrDefault();
}
catch (Exception ex)
{
throw ex;
}
}
#endregion
///<summary>
///获取主键，此方式只适用于edmx数据表结构
///</summary>
///<param name="infos"></param>
///<returns></returns>
private string getPrimaryKey(PropertyInfo[] infos)
{
string columnName = string.Empty;
foreach (PropertyInfo propertyInfo in infos)
{
object[] customInfos = propertyInfo.GetCustomAttributes(typeof(EdmScalarPropertyAttribute), true);
if (customInfos == null
|| customInfos.Length == 0)
return string.Empty;
EdmScalarPropertyAttribute limit = customInfos.GetValue(0) as EdmScalarPropertyAttribute;
if (limit.EntityKeyProperty)
{
return columnName = propertyInfo.Name;
}
}
return columnName;
}
//protected override string GetEntitySetName()
//{
// return context.Products.EntitySet.Name;
//}
#region 更新实体
public bool Update<T>(T entity, string PrimaryKey, object PrimaryKeyValue) where T : EntityObject
{
Type type = typeof(T);
string strName = entities.Connection.ConnectionString.Replace("name=", "");
EntityKey key = null;
try
{
entity.EntityKey = entities.CreateEntityKey(type.Name, entity);
}
catch (Exception ex)
{
}
try
{
key = entity.EntityKey;//new EntityKey("Entities." + type.Name, PrimaryKey, PrimaryKeyValue);
}
catch (Exception ex)
{ }
object propertyValue = null;
T entityFromDB = (T)entities.GetObjectByKey(key);
if (null == entityFromDB)
return false;
PropertyInfo[] properties1 = entityFromDB.GetType().GetProperties();
foreach (PropertyInfo property in properties1)
{
propertyValue = null;
if (null != property.GetSetMethod())
{
PropertyInfo entityProperty =
entity.GetType().GetProperty(property.Name);
if (entityProperty.PropertyType.BaseType ==
Type.GetType("System.ValueType") ||
entityProperty.PropertyType ==
Type.GetType("System.String"))
propertyValue = entity.GetType().GetProperty(property.Name).GetValue(entity, null);
if (propertyValue == null)
{
Thread.Sleep(50);
propertyValue = entity.GetType().GetProperty(property.Name).GetValue(entity, null);
}
if (null != propertyValue)
{
try
{
string Name = property.Name;// "Reference";
if (Name.IndexOf("Reference") < 0)
{
property.SetValue(entityFromDB, propertyValue, null);
}
}
catch (Exception ex) { }
}
}
}
entities.SaveChanges();
return true;
}
#endregion
#region 获取相关的实体信息
/// <summary>
/// 分页_获取指定页的数据集合
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="query">查询条件</param>
/// <param name="pageSize">每页显示数量</param>
/// <param name="pageNum">当前页号</param>
/// <param name="pageTotal">总页数</param>
/// <param name="datasTotal">总数据量</param>
/// <returns></returns>
public virtual List<T> GetAllEntity<T>(Expression<Func<T, bool>> query, PagingInfo PageInfo, Func<T, object> orderByDesc) where T : class
{
var table = GetTable<T>();
PageInfo.TotalRecord = (from t in table
select t).Where(query.Compile()).Count();
PageInfo.TotalPage = PageInfo.TotalRecord / PageInfo.PageSize + 1;
//string Sql=(table.Where(query.Compile()) as ObjectQuery).ToTraceString();
return (from t in table
select t).Where(query.Compile()).OrderByDescending(orderByDesc).Skip(PageInfo.PageSize * (PageInfo.PageIndex - 1)).Take(PageInfo.PageSize).ToList();
}
/// <summary>
/// 分页_获取指定页的数据集合
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="query">查询条件</param>
/// <param name="pageSize">每页显示数量</param>
/// <param name="pageNum">当前页号</param>
/// <param name="pageTotal">总页数</param>
/// <param name="datasTotal">总数据量</param>
/// <returns></returns>
public virtual List<T> GetAllEntity<T>(Expression<Func<T, bool>> query, Func<T, object> orderByDesc, int pageSize, int pageNum, out int pageTotal, out int datasTotal) where T : class
{
var table = GetTable<T>();
datasTotal = (from t in table
select t).Where(query).Count();
pageTotal = (int)Math.Ceiling((double)datasTotal / pageSize);
return (from t in table
select t).Where(query).OrderByDescending(orderByDesc).Skip(pageSize * (pageNum - 1)).Take(pageSize).ToList();
}
/// <summary>
/// 获取指定条件的实体集合
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="query">查询条件</param>
/// <returns></returns>
public virtual List<T> GetAllEntity<T>(Expression<Func<T, bool>> query) where T : class
{
var table = GetTable<T>();
return (from t in table
select t).Where(query).ToList();
}
/// <summary>
/// 获取指定条件的实体集合
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="query">查询条件</param>
/// <param name="orderAsc"></param>
/// <returns></returns>
public virtual List<T> GetAllEntity<T>(Expression<Func<T, bool>> query, bool isAsc, Func<T, object> order) where T : class
{
var table = GetTable<T>();
if (isAsc)
return (from t in table
select t).Where(query).OrderBy(order).ToList();
return (from t in table
select t).Where(query).OrderByDescending(order).ToList();
}
public virtual List<T> GetAllEntity<T>() where T : class
{
var table = GetTable<T>();
return (from t in table
select t).ToList();
}
#endregion
#region 新增实体
/// <summary>
/// 新增单个实体
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="entity">待插入的实体</param>
/// <returns></returns>
public virtual void InsertEntity<T>(T entity) where T : class
{
var table = GetTable<T>();
table.AddObject(entity);
entities.SaveChanges();
}
/// <summary>
/// 批量新增实体
/// </summary>
/// <typeparam name="T">泛型类型参数</typeparam>
/// <param name="entityList">待添加的实体集合</param>
/// <returns></returns>
public virtual void BatchInsertEntity<T>(List<T> entityList) where T : class
{
if (entityList.Count > 0)
{
var table = GetTable<T>();
foreach (var item in entityList)
{
table.AddObject(item);//DeleteAllOnSubmit(toDeletedColl);
}
entities.SaveChanges();
}
}
#endregion
#region 删除实体
/// <summary>
/// 根据条件删除指定实体
/// </summary>
/// <typeparam name="T">实体</typeparam>
/// <param name="query">条件</param>
/// <returns>bool</returns>
public virtual void DeleteEntitys<T>(Expression<Func<T, bool>> query) where T : class
{
var table = GetTable<T>();
var toDeletedColl = table.Where(query);
if (toDeletedColl != null && toDeletedColl.Count() > 0)
{
foreach (var item in toDeletedColl)
{
table.DeleteObject(item);//DeleteAllOnSubmit(toDeletedColl);
}
entities.SaveChanges();
}
}
#endregion
}
}
Entity Framework底层操作封装V2版本（2）,布布扣,bubuko.com
原文地址：http://blog.csdn.net/jacky4955/article/details/25411975
