初学.net增删改查
分页显示
DAL：
public List GetListByPager(int PageIndex, int PageSize, out int RowCount)
{
string sql = "select top " + PageSize + " * from GTMessage where GId not in (select top ((" + PageIndex + "-1)*" + PageSize + ") GId from GTMessage)";
string sqll = "select count(*) from GTMessage";
RowCount = Convert.ToInt32(DBHelper.ExecuteScalar(sqll));
DataTable dt = DBHelper.GetTable(sql);
List list = new List();
for (int i = 0; i < dt.Rows.Count; i++)
{
GModel g = new GModel();
g.GId = Convert.ToInt32(dt.Rows[i]["GId"]);
g.GCarId = dt.Rows[i]["GCarId"].ToString();
g.GHomeId = dt.Rows[i]["GHomeId"].ToString();
g.GGoods = dt.Rows[i]["GGoods"].ToString();
g.GTime = dt.Rows[i]["GTime"].ToString();
g.GName = dt.Rows[i]["GName"].ToString();
list.Add(g);
}
return list;
}
Controllers：
public ActionResult Index()
{
int PageIndex = 1;
int PageSize = 5;
int RowCount = 0;
int PageCount = 0;
if (Request["PageIndex"] != null)
{
PageIndex = Convert.ToInt32(Request["PageIndex"]);
}
if (PageIndex < 1)
{
PageIndex = 1;
}
if (Session["PageCount"] != null && PageIndex > Convert.ToInt32(Session["PageCount"]))
{
PageIndex = Convert.ToInt32(Session["PageCount"]);
}
ViewData["PIndex"] = PageIndex;
List<GModel> list = bll.GetListByPager(PageIndex, PageSize, out RowCount);
PageCount = RowCount % PageSize == 0 ? RowCount / PageSize : RowCount / PageSize + 1;
Session["PageCount"] = PageCount;
return View(list);
}
View：
<a href="/Home/Index/1">首页</a>
<a href="/Home/Index?PageIndex=@(Convert.ToInt32(ViewData["PIndex"])-1)">上一页</a>
@for (int ii = 0; ii < Convert.ToInt32(Session["PageCount"]); ii++)
{
if ((ii + 1) == Convert.ToInt32(ViewData["PIndex"]))
{
<a href="/Home/Index?PageIndex=@(ii+1)" style="font-size:20px;color:red">@(ii + 1)</a>
}
else
{
<a href="/Home/Index?PageIndex=@(ii+1)">@(ii + 1)</a>
}
}
<a href="/Home/Index?PageIndex=@(Convert.ToInt32(ViewData["PIndex"]) + 1)">下一页</a>
<a href="/Home/Index?PageIndex=@Session["PageCount"]">尾页</a>
添加
DAL：
public int AddGaoTie(GModel GModel)
{
string sql = "insert into GTMessage values ('" + GModel.GCarId + "','" + GModel.GHomeId + "','" + GModel.GGoods + "','" + GModel.GTime + "','" + GModel.GName + "')";
return DBHelper.ExecuteNonQuery(sql);
}
Controllers：
public ActionResult AddDo(GModel GModel)
{
int i = bll.AddGaoTie(GModel);
if (i > 0)
{
return Content("<script>alert('添加成功！');location.href='/Home/index'</script>");
}
else
{
return Content("<script>alert('添加失败！');location.href='/Home/Add'</script>");
}
}
修改
修改首先要根据id查询单行数据进行修改视图的反填
根据id查询单行数据DAL：
public GModel GetListById(int id)
{
string sql = "select * from GTMessage where Gid="+id+"";
DataTable table = DBHelper.GetTable(sql);
GModel g = new GModel();
g.GId = Convert.ToInt32(table.Rows[0]["GId"]);
g.GCarId = (table.Rows[0]["GCarId"]).ToString();
g.GGoods = (table.Rows[0]["GGoods"]).ToString();
g.GHomeId = (table.Rows[0]["GHomeId"]).ToString();
g.GName = (table.Rows[0]["GName"]).ToString();
g.GTime = (table.Rows[0]["GTime"]).ToString();
return g;
}
执行修改DAL：
public int UpdGaoTie(GModel GModel)
{
string sql = "update GTMessage set GCarId=" + GModel.GCarId + ",GHomeId=" + GModel.GHomeId + ",GGoods=" + GModel.GGoods + ",GTime=" + GModel.GTime + ",GName=" + GModel.GName + " where GId=" + GModel.GId + "";
return DBHelper.ExecuteNonQuery(sql);
}
Controllers：
修改视图反填：
public ActionResult UpdateShow(int id)
{
GModel g = bll.GetListById(id);
return View(g);
}
执行修改：
public ActionResult UpdDo(GModel GModel)
{
int i = bll.UpdGaoTie(GModel);
if (i > 0)
{
return Content("<script>alert('修改成功！');location.href='/Home/index'</script>");
}
else
{
return Content("<script>alert('修改失败！');location.href='/Home/UpdateShow'</script>");
}
}
修改视图中数据id可以不显示，但视图中必须获取id数据，可以用@Html.Hidden("GId")来隐藏id的显示。因为在做修改操作时须将id传给Controllers的执行修改中进行修改
删除
DAL
public int DelGaoTie(string ids)
{
string sql = "delete GTMessage where GId in (" + ids + ")";
return DBHelper.ExecuteNonQuery(sql);
}
Controllers：
public ActionResult DelDo(int id)
{
int i = bll.DelGaoTie(id.ToString());
if (i > 0)
{
return Content("<script>alert('删除成功！');location.href='/Home/index'</script>");
}
else
{
return Content("<script>alert('删除失败！');location.href='/Home/index'</script>");
}
}
根据GGoods，GName查询数据
public List<GModel> SearchistByPager(int PageIndex, int PageSize, string GGoods, string GName)
{
string sql = "select top " + PageSize + " * from GTMessage where GId not in (select top ((" + PageIndex + "-1)*" + PageSize + ") GId from GTMessage) and GGoods like '%" + GGoods + "%' and GName like '%" + GName+ "%'";
//string sqll = "select count(*) from GTMessage";
//RowCount = Convert.ToInt32(DBHelper.ExecuteScalar(sqll));
DataTable dt = DBHelper.GetTable(sql);
List<GModel> list = new List<GModel>();
for (int i = 0; i < dt.Rows.Count; i++)
{
GModel g = new GModel();
g.GId = Convert.ToInt32(dt.Rows[i]["GId"]);
g.GCarId = dt.Rows[i]["GCarId"].ToString();
g.GHomeId = dt.Rows[i]["GHomeId"].ToString();
g.GGoods = dt.Rows[i]["GGoods"].ToString();
g.GTime = dt.Rows[i]["GTime"].ToString();
g.GName = dt.Rows[i]["GName"].ToString();
list.Add(g);
}
return list;
}
Controllers
public ActionResult SearchistByPager(string GGoods,string GName)
{
int PageIndex = 1;
int PageSize = 5;
int RowCount = 0;
int PageCount = 0;
if (Request["PageIndex"] != null)
{
PageIndex = Convert.ToInt32(Request["PageIndex"]);
}
if (PageIndex < 1)
{
PageIndex = 1;
}
if (Session["PageCount"] != null && PageIndex > Convert.ToInt32(Session["PageCount"]))
{
PageIndex = Convert.ToInt32(Session["PageCount"]);
}
ViewData["PIndex"] = PageIndex;
//List<GModel> list = bll.GetListByPager(PageIndex, PageSize, out RowCount);
PageCount = RowCount % PageSize == 0 ? RowCount / PageSize : RowCount / PageSize + 1;
Session["PageCount"] = PageCount;
return View("Index",bll.SearchistByPager(PageIndex,PageSize,GGoods,GTime));
}
对于动态下拉框的数据获取，绑定如下
首先需要在DAL层查询主表数据
public List<RTypeModel> GetRTList()
{
string sql = "select RTid,RTname from RType ";
DataTable dt = DBHelper.GetTable(sql);
List<RTypeModel> list = new List<RTypeModel>();
for (int i = 0; i < dt.Rows.Count; i++)
{
RTypeModel rt = new RTypeModel();
rt.RTid = Convert.ToInt32(dt.Rows[i]["RTid"]);
rt.RTname = dt.Rows[i]["RTname"].ToString();
list.Add(rt);
}
return list;
}
在Controllers中需要使用ViewBag存值向视图传值
ViewBag.RTid = new SelectList(bll.GetRTList(), "RTid", "RTname");
在视图中绑定下拉框数据
@Html.DropDownList("RTid")
