Entity Framework底层操作封装(1)
最近做移动的项目,要求底层数据库是Oracle,但是因为本机是Sqlserver的环境。想了下,于是使用Entity Framework 进行开发,在开发完成以后切换到Oracle环境。想了下,就决定把以前封装的Linq的底层操作类进行了修改,形成EF的底层操作类。这样在自己熟悉的环境下,效率也会高很多,及时以后这个不好用,我切换起来也会简单很多。多的不过了,各位看官上代码,首先上的第一个类是底层操作的类。
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Linq.Expressions;
- using System.Data.Entity;
- using NOAS.PublicOpinionMonitor.ENTITY;
- using System.Data.Linq;
- using System.Data.Objects;
- using System.Reflection;
- using System.Threading;
- namespace NOAS.PublicOpinionMonitor.Access.Common
- {
- public class DataCommon
- {
- static readonly string Connection = "name=POMonitorDBEntities";
- 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
- {
- POMonitorDBEntities entitiesNew = new POMonitorDBEntities(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
- #region 更新实体
- /// <summary>
- /// 更新实体
- /// </summary>
- /// <typeparam name="T">泛型类型参数</typeparam>
- /// <param name="entity">更改后的实体</param>
- public virtual bool Update<T>(T entity) where T : class
- {
- object propertyValue = null;
- T entityFromDB = GetSingleEntity<T>(s => s == entity);
- if (null == entityFromDB)
- return false;
- PropertyInfo[] properties = entityFromDB.GetType().GetProperties();
- foreach (PropertyInfo property in properties)
- {
- 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)
- property.SetValue(entityFromDB, propertyValue, null);
- }
- }
- 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, 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 = datasTotal / pageSize + 1;
- return (from t in table
- select t).Where(query).Skip(pageSize * (pageNum - 1)).Take(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
- }
- }