HttpHandler（一般处理程序）进行增删改查
如果不是asp.net webform,怎么进行增删改查呢？
首先：
创建一个SqlHelper.cs
public class SqlHelper
{
public static readonly string conString = ConfigurationManager.ConnectionStrings["sqlCon"].ConnectionString;
//增删改
public static bool ExeNonQuery(string sql, CommandType type, params SqlParameter[] lists)
{
bool bFlag = false;
using (SqlConnection con = new SqlConnection(conString))
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = sql;
cmd.CommandType = type;
if (lists!=null)
{
foreach (SqlParameter p in lists)
{
cmd.Parameters.Add(p);
}
}
try
{
if (con.State == ConnectionState.Closed)
{
con.Open();
}
int result = cmd.ExecuteNonQuery();
if (result > 0)
{
bFlag = true;
}
}
catch { ;}
}
return bFlag;
}
//查．读
public static SqlDataReader ExeDataReader(string sql, CommandType type, params SqlParameter[] lists)
{
SqlConnection con = new SqlConnection(conString);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = sql;
cmd.CommandType = type;
if (con.State == ConnectionState.Closed)
{
con.Open();
}
if (lists!=null)
{
foreach (SqlParameter p in lists)
{
cmd.Parameters.Add(p);
}
}
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
//返回单个值
public static object GetScalar(string sql, CommandType type, params SqlParameter[] lists)
{
object returnValue = null;
using (SqlConnection con = new SqlConnection(conString))
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = sql;
cmd.CommandType = type;
if (lists!=null)
{
foreach (SqlParameter p in lists)
{
cmd.Parameters.Add(p);
}
}
try
{
if (con.State == ConnectionState.Closed)
{
con.Open();
}
returnValue = cmd.ExecuteScalar();
}
catch { ; }
}
return returnValue;
}
//事务
public static bool ExeNonQueryTran(List<SqlCommand> list)
{
bool flag = true;
SqlTransaction tran = null;
using (SqlConnection con = new SqlConnection(conString))
{
try
{
if (con.State == ConnectionState.Closed)
{
con.Open();
tran = con.BeginTransaction();
foreach (SqlCommand com in list)
{
com.Connection = con;
com.Transaction = tran;
com.ExecuteNonQuery();
}
tran.Commit();
}
}
catch (Exception ex)
{
Console.Write(ex.Message);
tran.Rollback();
flag = false;
}
}
return flag;
}
//返回DataTable
public static DataTable GetTable(string sql)
{
SqlConnection conn = new SqlConnection(conString);
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataTable table = new DataTable();
da.Fill(table);
return table;
}
}
然后再Web.Config里面进行配置
<configuration>
<connectionStrings>
<add name="sqlCon" connectionString="server=.;database=student;uid=sa;pwd=fiybird"/>
</connectionStrings>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
将要操作的表stus
创建一个html页面List.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="JS/jquery-1.8.3.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("a:contains('删除')").click(function () {
if (!confirm("你确定要删除么")) {
return false;
}
})
})
</script>
</head>
<body>
<table border="1" cellspacing="0" cellpadding="0" width="500">
<tr>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>班级</th>
<th>操作(删除)</th>
<th>操作(查看)</th>
<th>操作(修改)</th>
</tr>
{body}//这里是不是看不懂，先别急，往下看
</table>
</body>
</html>
接着创建一个一般处理程序List.ashx
public class List : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
// string path = context.Server.MapPath("List.html");
string strHtml = Commd.getFile("List.html");
context.Response.Write(strHtml.Replace("{body}", Getpost()));//把得到的数据和{body}进行替换
}
string Getpost()
{
StringBuilder sb = new StringBuilder();
List<Stus> list = getAll();
foreach (Stus stu in list)
{
sb.AppendFormat("<tr>");
sb.AppendFormat("<td>" + stu.id + "</td>");
sb.AppendFormat("<td>"+stu.name+"</td>");
sb.AppendFormat("<td>" + stu.sex + "</td>");
sb.AppendFormat("<td>" + stu.c_id + "</td>");
sb.AppendFormat("<td><a href='Del.ashx?id={0}'>删除</a></td>",stu.id);
sb.AppendFormat("<td><a href='Dils.ashx?id={0}'>查看</a></td>", stu.id);
sb.AppendFormat("<td><a href='Edit.ashx?id={0}'>修改</a></td>", stu.id);
sb.AppendFormat("</tr>");
}
return sb.ToString();
}
public List<Stus> getAll()//查询得到所有的数据
{
string sql=string.Format("select * from stus");
List<Stus> list = new List<Stus>();
IDataReader red = SqlHelper.ExeDataReader(sql, CommandType.Text, null);
while (red.Read())
{
Stus s = new Stus
{
id = int.Parse(red[0].ToString()),
name = red[1].ToString(),
sex = red[2].ToString(),
c_id = int.Parse(red[3].ToString())
};
list.Add(s);
}
return list;
}
public class Stus//创建类
{
public int id { get; set; }
public string name { get; set; }
public string sex { get; set; }
public int c_id { get; set; }
}
public bool IsReusable
{
get
{
return false;
}
}
}
显示效果：
接着进行删除操作处理：
创建一个Del.ashx处理删除
public class Del : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
int id = int.Parse(context.Request["id"]);
if(onDel(id))
{
context.Response.Redirect("List.ashx");
}
}
bool onDel(int id)
{
string sql = string.Format("delete from stus where id={0}",id);
return SqlHelper.ExeNonQuery(sql, CommandType.Text, null);
}
public bool IsReusable
{
get
{
return false;
}
}
}
效果：
已经被删除了
再接下来进行查看的操作，着里要创建一个Dils.ashx和Dils.html
先看 Dils.html页面
<table border="1" cellspacing="0" cellpadding="0" width="300">
<tr>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>班级</th>
</tr>
<tr>
<td>{id}</td>
<td>{name}</td>
<td>{sex}</td>
<td>{c_id}</td>
</tr>
<tr>
<td colspan="4"><a href="List.ashx">返回</a></td>
</tr>
</table>
然后Dils.ashx进行处理：
public class Dils : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
int id = int.Parse(context.Request["id"]);
string strHtml = Commd.getFile("Dils.html");
DataTable dt=getTable(id);
strHtml = strHtml.Replace("{id}", dt.Rows[0]["id"].ToString());
strHtml=strHtml.Replace("{name}",dt.Rows[0]["name"].ToString());
strHtml=strHtml.Replace("{sex}",dt.Rows[0]["sex"].ToString());
strHtml = strHtml.Replace("{c_id}", dt.Rows[0]["c_id"].ToString());
context.Response.Write(strHtml);
}
DataTable getTable(int id)
{
string sql = string.Format("select id,name,sex,c_id from stus where id={0}",id);
DataTable dt = SqlHelper.GetTable(sql);
return dt;
}
public bool IsReusable
{
get
{
return false;
}
}
}
效果：
最后来看看修改的操作：
这里先建立一个Edit.html页面：
<form action="EditPros.ashx" method="post">
<table border="1" cellspacing="0" cellpadding="0" width="100%">
<tr>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>班级</th>
</tr>
<tr>
<td><input type="txt" name="id" value="{id}" disabled="disabled" />
<input type="hidden" name="id" value="{id}" />
</td>
<td><input type="txt" name="name" value="{name}" /></td>
<td><input type="txt" name="sex" value="{sex}" /></td>
<td><input type="txt" name="c_id" value="{c_id}" /></td>
</tr>
<tr>
<td colspan="4">
<input type="submit" value="提交"/>
<input type="reset" value="重置"/>
</td>
</tr>
</table>
</form>
然后创建Edit.ashx和 EditPros.ashx来进行处理
Edit.ashx处理跟Dils.ashx差不多
public class Dils : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
int id = int.Parse(context.Request["id"]);
string strHtml = Commd.getFile("Dils.html");
DataTable dt=getTable(id);
strHtml = strHtml.Replace("{id}", dt.Rows[0]["id"].ToString());
strHtml=strHtml.Replace("{name}",dt.Rows[0]["name"].ToString());
strHtml=strHtml.Replace("{sex}",dt.Rows[0]["sex"].ToString());
strHtml = strHtml.Replace("{c_id}", dt.Rows[0]["c_id"].ToString());
context.Response.Write(strHtml);
}
DataTable getTable(int id)
{
string sql = string.Format("select id,name,sex,c_id from stus where id={0}",id);
DataTable dt = SqlHelper.GetTable(sql);
return dt;
}
public bool IsReusable
{
get
{
return false;
}
}
}
效果：
当点了提交后，要在 EditPros.ashx进行处理
public class EditPros : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
int id=int.Parse(context.Request["id"]);
string name = context.Request["name"];
string sex = context.Request["sex"];
int c_id = int.Parse(context.Request["c_id"]);
if (onUp(id, name, sex, c_id))
{
context.Response.Redirect("List.ashx");
}
}
bool onUp(int id, string name, string sex, int c_id)
{
string sql = string.Format("update stus set name='{0}',sex='{1}',c_id={2} where id={3}", name, sex, c_id, id);
return SqlHelper.ExeNonQuery(sql,CommandType.Text,null);
}
public bool IsReusable
{
get
{
return false;
}
}
}
效果：
已经修改完成！
那么要是添加的话，怎么操作呢？
试试看。。。。。
