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封装自己通用的 增删改查的方法 By EF

2019年11月02日  | 移动技术网IT编程  | 我要评论

2eyes郑多恩 吴世勋,加藤鹰电影,8090kk电影

封装自己的通用curd by ef

using system;
using system.collections.generic;
using system.data.entity;
using system.data.entity.infrastructure;
using system.linq;
using system.linq.expressions;
using system.text;
using model;

namespace zrfdemo.dal
{
    public class basedal<t> where t:class  //----这里我们可以实现 新增一个泛型的接口 如： ibasedal<t>.......
    {
        //1.创建ef上下文
        zrfentityes db = new zrfentityes();//---这里我们可以使用线程内唯一来优化，

        public basedal()
        {
            //关闭 ef 检查
            db.configuration.validateonsaveenabled = false;
        }

        #region 0.0 批量更新ef容器数据到数据库 +int savechanges()
        /// <summary>
        /// 0.0 批量更新ef容器数据到数据库
        /// </summary>
        /// <returns>返回受影响行数</returns>
        public int savechanges()
        {
            return db.savechanges();
        } 
        #endregion

        #region 1.0 新增方法 +void add(t model)
        /// <summary>
        /// 1.0 新增方法
        /// </summary>
        /// <param name="model"></param>
        public void add(t model)
        {
            //1.直接通过ef上下文的 set方法 获取一个 针对于 t类 做操作的 dbset对象
            //var dbset = db.set<t>();
            //dbset.add(model);
            db.set<t>().add(model);
        } 
        #endregion

        #region 2.0 删除方法 +void delete(t model)
        /// <summary>
        /// 2.0 删除方法
        /// </summary>
        /// <param name="model"></param>
        public void delete(t model)
        {
            dbentityentry entry = db.entry<t>(model);
            entry.state = system.data.entitystate.deleted;
        } 
        #endregion

        #region 2.1 条件删除方法 +void deleteby(system.linq.expressions.expression<func<t, bool>> delwhere)
        /// <summary>
        /// 2.1 条件删除方法
        /// </summary>
        /// <param name="delwhere">要删除的元素查询条件</param>
        public void deleteby(system.linq.expressions.expression<func<t, bool>> delwhere)
        {
            var dellist = db.set<t>().where(delwhere);
            foreach (t model in dellist)
            {
                delete(model);
            }
        }
        #endregion

        #region 3.0 修改实体 + void modify(t model, params string[] propertynames)
        /// <summary>
        /// 3.0 修改实体
        /// </summary>
        /// <param name="model"></param>
        /// <param name="propertynames"></param>
        public void modify(t model, params string[] propertynames)
        {
            dbentityentry entry = db.entry<t>(model);
            entry.state = system.data.entitystate.unchanged;
            foreach (string proname in propertynames)
            {
                entry.property(proname).ismodified = true;
            }
        } 
        #endregion

        #region 4.0 查询方法 +iqueryable<t> where(expression<func<t, bool>> wherelambda)
        /// <summary>
        /// 4.0 查询方法
        /// </summary>
        /// <param name="wherelambda"></param>
        /// <returns></returns>
        public iqueryable<t> where(expression<func<t, bool>> wherelambda)
        {
            return db.set<t>().where(wherelambda);
        } 
        #endregion

        #region 4.1 查询方法 -带排序 +iqueryable<t> whereorder<tkey>
        /// <summary>
        /// 4.1 查询方法 -带排序
        /// </summary>
        /// <typeparam name="tkey"></typeparam>
        /// <param name="wherelambda"></param>
        /// <param name="keyselector">u=></param>
        /// <param name="isasc"></param>
        /// <returns></returns>
        public iqueryable<t> whereorder<tkey>(expression<func<t, bool>> wherelambda, expression<func<t, tkey>> keyselector, bool isasc = true)
        {
            if (isasc)
                return db.set<t>().where(wherelambda).orderby(keyselector);
            else
                return db.set<t>().where(wherelambda).orderbydescending(keyselector);
        } 
        #endregion

        #region 4.2 查询方法 -带include +iqueryable<t> whereinclude
        /// <summary>
        /// 4.2 查询方法 -带include
        /// </summary>
        /// <param name="wherelambda"></param>
        /// <param name="includepropertynames">要进行连接查询的 属性名</param>
        /// <returns></returns>
        public iqueryable<t> whereinclude(expression<func<t, bool>> wherelambda, params string[] includepropertynames)
        {
            dbquery<t> dbquery = db.set<t>();
            foreach (string includename in includepropertynames)
            {
                dbquery = dbquery.include(includename);
            }
            return dbquery.where(wherelambda);

            //dbquery<t> dbset = (dbquery<t>)db.set<t>().where(wherelambda);
            //foreach (string includename in includepropertynames)
            //{
            //        dbset = dbset.include(includename);
            //}
            //return dbset;
        }
        #endregion

        #region 4.3 查询方法 -带include 和 排序 +iqueryable<t> whereinclude<tkey>
        /// <summary>
        /// 4.3 查询方法 -带include 和 排序
        /// </summary>
        /// <typeparam name="tkey"></typeparam>
        /// <param name="wherelambda"></param>
        /// <param name="keyselector"></param>
        /// <param name="isasc"></param>
        /// <param name="includepropertynames"></param>
        /// <returns></returns>
        public iqueryable<t> whereinclude<tkey>(expression<func<t, bool>> wherelambda, expression<func<t, tkey>> keyselector, bool isasc = true, params string[] includepropertynames)
        {
            dbquery<t> dbquery = db.set<t>();
            foreach (string includename in includepropertynames)
            {
                dbquery = dbquery.include(includename);
            }
            iqueryable<t> query = dbquery.where(wherelambda);
            if (isasc)
                return query.orderby(keyselector);
            else
                return query.orderbydescending(keyselector);
        } 
        #endregion

        #region 4.4 查询方法 - 分页+include+排序 + void wherepaged<tkey>
        /// <summary>
        /// 4.4 查询方法 - 分页+include+排序
        /// </summary>
        /// <typeparam name="tkey"></typeparam>
        /// <param name="pageddata"></param>
        /// <param name="wherelambda"></param>
        /// <param name="keyselector"></param>
        /// <param name="isasc"></param>
        /// <param name="includepropertynames"></param>
        public void wherepaged<tkey>(model.formatmodel.pageddata pageddata, expression<func<t, bool>> wherelambda, expression<func<t, tkey>> keyselector, bool isasc = true, params string[] includepropertynames)
        {
            //0.获取 要操作的 数据表 对应的查询对象
            dbquery<t> dbquery = db.set<t>();
            //1.include 属性
            foreach (string includename in includepropertynames)
            {
                dbquery = dbquery.include(includename);
            }
            iorderedqueryable<t> orderquery = null;
            //2.排序
            if (isasc) orderquery = dbquery.orderby(keyselector);
            else orderquery = dbquery.orderbydescending(keyselector);
            //3.分页查询
            pageddata.listdata = orderquery.where(wherelambda).skip((pageddata.pageindex - 1) * pageddata.pagesize).take(pageddata.pagesize).tolist();
            //4.获取总行数
            pageddata.rowcount = orderquery.where(wherelambda).count();
        } 
        #endregion
    }
}

　　

另外我们还可新增查询sql的方法，这就不过多啰嗦了！

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