公共增删改查(MVC+三层架构)
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1.建立数据访问层：新建一个项目，选择类库，命名为XXXDAL，然后把新生成的类删除，重新建一个类BaseDal，代码如下：
public class BaseDal<T> where T : class,new() { syEntities1 db = new syEntities1(); /// <summary> /// 添加 /// </summary> /// <param name="model"></param> /// <returns></returns> public int Add(T model) { db.Entry(model).State = EntityState.Added; return db.SaveChanges(); } /// <summary> /// 删除 /// </summary> /// <param name="model"></param> /// <returns></returns> public int Delete(T model) { db.Entry(model).State = EntityState.Deleted; return db.SaveChanges(); } /// <summary> /// 编辑 /// </summary> /// <param name="model"></param> /// <returns></returns> public int Edit(T model) { db.Entry<T>(model).State = EntityState.Modified; return db.SaveChanges(); } /// <summary> /// 查询 /// </summary> /// <param name="whereLambda">lambda表达式</param> /// <returns></returns> public List<T> LoadEntities(Expression<Func<T, bool>> whereLambda) { return db.Set<T>().Where<T>(whereLambda).ToList(); } /// <summary> /// 查询并按指定列排序 /// </summary> /// <typeparam name="K"></typeparam> /// <param name="whereLambda"></param> /// <param name="orderbyLambda"></param> /// <returns></returns> public List<T> LoadEntities<K>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, K>> orderbyLambda) { return db.Set<T>().OrderBy<T, K>(orderbyLambda).Where<T>(whereLambda).ToList(); } /// <summary> /// 查询分页 /// </summary> /// <typeparam name="K"></typeparam> /// <param name="pageIndex">第几页</param> /// <param name="pageSize">显示的行数量</param> /// <param name="whereLambda"></param> /// <param name="orderLambda"></param> /// <returns></returns> public List<T> LoadEntities<K>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, K>> orderLambda) { return db.Set<T>().OrderBy<T, K>(orderLambda).Where<T>(whereLambda).Skip<T>((pageIndex - 1) * pageSize).Take<T>(pageSize).ToList(); } }
2.建立业务逻辑层：新建一个项目，选择类库，命名为XXXBLL，然后把新生成的类删除，重新建一个类BaseBll，代码如下：
public abstract class BaseBll<T> where T : class,new() { protected BaseDal<T> dal; /// <summary> /// 添加 /// </summary> /// <param name="model"></param> /// <returns></returns> public bool Add(T model) { return dal.Add(model) > 0; } /// <summary> /// 删除 /// </summary> /// <param name="model"></param> /// <returns></returns> public bool Delete(T model) { return dal.Delete(model) > 0; } /// <summary> /// 编辑 /// </summary> /// <param name="model"></param> /// <returns></returns> public bool Edit(T model) { return dal.Edit(model) > 0; } /// <summary> /// 查询 /// </summary> /// <param name="whereLambda"></param> /// <returns></returns> public List<T> LoadEntities(Expression<Func<T, bool>> whereLambda) { return dal.LoadEntities(whereLambda); } /// <summary> /// 查询拼按指定列排序 /// </summary> /// <typeparam name="K"></typeparam> /// <param name="whereLambda"></param> /// <param name="orderbyLambda"></param> /// <returns></returns> public List<T> LoadEntities<K>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, K>> orderbyLambda) { return dal.LoadEntities(whereLambda, orderbyLambda); } /// <summary> /// 查询分页 /// </summary> /// <typeparam name="K"></typeparam> /// <param name="pageIndex">第几页</param> /// <param name="pageSize">显示的行数量</param> /// <param name="whereLambda"></param> /// <param name="orderLambda"></param> /// <returns></returns> public List<T> LoadEntities<K>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, K>> orderLambda) { return dal.LoadEntities(pageIndex, pageSize, whereLambda, orderLambda); } }
3.建立模型层：新建一个项目，从左边选择数据---ADO.NET实体数据模型，选择要连接的数据库，如下图：
4.如有新表Smno，那么只需要新建一个业务逻辑类和数据访问类：SmnoBll和SmnoDal，再继续父类BaseBll和BaseDal即可：
public class SmnoBll : BaseBll<Smno> { public SmnoBll() { dal = new SmnoDal();//创建Smno这张表的实例 } }
public class SmnoDal : BaseDal<Smno> { }
5.控制器调用：
SmnoBll smnoBll = new SmnoBll(); public ActionResult Text() { List<Smno> smno = smnoBll.LoadEntities(1, 10, u => true, u => u.Id); return View(); }
6.分页例子：
新建一个类PageNavHelper，代码如下：
public class PageNavHelper { //主要就是输出分页的超级链接的标签 //自定义分页Helper扩展 public static string ShowPageNavigate(int currentPage, int pageSize, int totalCount) { var redirectTo = HttpContext.Current.Request.Url.AbsolutePath; pageSize = pageSize <= 0 ? 3 : pageSize; var totalPages = Math.Max((totalCount + pageSize - 1) / pageSize, 1); //总页数 var output = new StringBuilder(); //output.AppendFormat("<table border=‘1‘ style=‘width:330px;height:10px‘><tr><td>"); if (totalPages > 1) { //if (currentPage != 1) //处理首页连接 { output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex=1&pageSize={1}‘>首页</a> ", redirectTo, pageSize); } if (currentPage > 1) {//处理上一页的连接 output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>上一页</a> ", redirectTo, currentPage - 1, pageSize); } else { // output.Append("<span class=‘pageLink‘>上一页</span>"); } output.Append(" "); int currint = 5; for (int i = 0; i <= 10; i++) {//一共最多显示10个页码，前面5个，后面5个 if ((currentPage + i - currint) >= 1 && (currentPage + i - currint) <= totalPages) { if (currint == i) {//当前页处理 //output.Append(string.Format("[{0}]", currentPage)); output.AppendFormat("<a class=‘cpb‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>{3}</a> ", redirectTo, currentPage, pageSize, currentPage); } else {//一般页处理 output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>{3}</a> ", redirectTo, currentPage + i - currint, pageSize, currentPage + i - currint); } } output.Append(" "); } if (currentPage < totalPages) {//处理下一页的链接 output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>下一页</a> ", redirectTo, currentPage + 1, pageSize); } else { //output.Append("<span class=‘pageLink‘>下一页</span>"); } output.Append(" "); if (currentPage != totalPages) { output.AppendFormat("<a class=‘pageLink‘ href=‘{0}?pageIndex={1}&pageSize={2}‘>末页</a> ", redirectTo, totalPages, pageSize); } output.Append(" "); } output.AppendFormat("第{0}页 / 共{1}页", currentPage, totalPages);//这个统计加不加都行 //output.AppendFormat("</td></tr></table>"); return output.ToString(); } }
新建一个控制器Home并为Index添加一个视图:
public ActionResult Index() { return View(); }
视图html代码(含css、jquery):
@{ Layout = null; } <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>loadjson</title> <script src="~/Scripts/jquery-1.7.1.min.js"></script> <script src="~/Scripts/jquery-ui-1.8.20.min.js"></script> <script src="~/Scripts/jquery.unobtrusive-ajax.js"></script> <script src="~/Scripts/jquery.validate.unobtrusive.js"></script> <style type="text/css"> body { } .paginator { font: 12px Arial, Helvetica, sans-serif; padding: 10px 20px 10px 0; margin: 0px; } .paginator a { border: solid 1px #ccc; color: #0063dc; cursor: pointer; text-decoration: none; } .paginator a:visited { padding: 1px 6px; border: solid 1px #ddd; background: #fff; text-decoration: none; } .paginator .cpb { border: 1px solid #F50; font-weight: 700; color: #F50; background-color: #ffeee5; } .paginator a:hover { border: solid 1px #F50; color: #f60; text-decoration: none; } .paginator a, .paginator a:visited, .paginator .cpb, .paginator a:hover { float: left; height: 16px; line-height: 16px; min-width: 10px; _width: 10px; margin-right: 5px; text-align: center; white-space: nowrap; font-size: 12px; font-family: Arial,SimSun; padding: 0 3px; } </style> <script type="text/javascript"> $(function () { //页面加载完成后从后如加载当前页数据 initTable(); }); //初始化表格数据 function initTable(queryData) { $.getJSON("/Home/loadjson/", queryData, function (data) { var tb = $("#tbList"); //先移除旧的，添加新的 $("#tbList tr[type=data]").remove(); for (var i = 0; i < data.Data.length; i++) { var strTr = "<tr type=‘data‘>"; strTr += "<td>" + data.Data[i].Id + "</td>"; strTr += "<td>" + data.Data[i].Pn + "</td>"; strTr += "<td>" + data.Data[i].Unit + "</td>"; strTr += "<td>" + data.Data[i].PnName + "</td>"; strTr += "<td><a UId=‘" + data.Data[i].id + "‘ href=‘javascript:void(0)‘>修改</a>" + "<a UId=‘" + data.Data[i].ID + "‘ href=‘javascript:void(0)‘>删除</a></td>"; strTr += "</tr>"; tb.append(strTr); } $("#Nav").html(data.NavStr); //绑定分页标签的点击事件 $(".pageLink").click(function () { //把页码弹出来 var strHref = $(this).attr("href"); var queryStr = strHref.substr(strHref.indexOf(‘?‘) + 1); initTable(queryStr); return false; }); }); } </script> </head> <body> <div> <table border="1" id="tbList"> <tr> <td>id</td> <td>型号</td> <td>单位</td> <td>名字</td> <td>修改与删除</td> </tr> </table> <div id="Nav" class="paginator"> </div> </div> </body> </html>
在Home控制器下添加一个方法loadjson：
/// <summary> /// 异步分页 /// </summary> /// <returns></returns> public ActionResult loadjson() { int pageSize = Request["pageSize"] == null ? 10 : int.Parse(Request["pageSize"]); int pageIndex = Request["pageIndex"] == null ? 1 : int.Parse(Request["pageIndex"]); int totalCount = smnoBll.LoadEntities(u => true).Count; //给前台userinfo所有的数据，并且是json格式 //var allorder = smnoBll.tbl_admin.OrderBy(u => u.id) // .Skip(pageSize * (pageIndex - 1)) // .Take(pageSize) // .ToList(); var allorder = smnoBll.LoadEntities(pageIndex, pageSize, u => true, u => u.Id); //接受一个对像，内部把此对象使用javaScript序列化类对象志字符串，发送到前台 var data = from u in allorder select new { u.Id, u.Pn, u.Unit, u.PnName }; string strNav = PageNavHelper.ShowPageNavigate(pageIndex, pageSize, totalCount); var result = new { Data = data, NavStr = strNav }; return Json(result, JsonRequestBehavior.AllowGet); }
效果如下图：
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