ADO.NET | use the Command object to call a stored procedure | achieve search function

First, what is a stored procedure

The stored procedure is in large databases, a complete specific function SQL语句集; a compilation permanent, and finally returns the results users want, so in the more complex business processes, usually using stored procedures query package.

Use SqlCommandwhen there object to call a stored procedure and execute SQL statements command a big difference, mainly includes the transfer of the stored procedure parameters, and output parameters to obtain the stored procedure returns a fundamentally different values and so on.

Second, the example: use the Command object to call a stored procedure to achieve search function

This example is based on the content of a blog, the blog part of my point Go to page! !

First look at the results:

Then look at the gradual implementation process:

Step 1: create a stored procedure, first click on Schoolthe database, and then open 可编程性, right-click 存储过程, last click 新建, like this:

Then written Sqlstatement:

create proc GetStudentList
@SearchValue varchar(256)=''
as
begin
	if @SearchValue<>''
	begin
		select * from [dbo].[Student] where Name like '%'+@SearchValue+'%'
	end
	else
	begin
		select * from [dbo].[Student]
	end
end

Step 2: create a new site, create Default.aspxpages, add text boxes and input box controls in the page:

        <div>
            <div>
                <asp:TextBox ID="TextBox1" runat="server" class="TxtSearch"></asp:TextBox>
                <asp:Button ID="Button1" runat="server" Text="搜索" CssClass="BtnSearch" OnClick="Button1_Click" />
            </div>
            <div id="tabList" runat="server">

            </div>
        </div>

Step 3: Set the table and search for the build CSSstyle:

    <style type="text/css">
        .TxtSearch,.BtnSearch{
            border-width:1px;
            border-style:solid;
        }
        table,table th,table td{
            border:1px;
            border-style:solid;
            border-color:#22bbad;

        }
        table th{
            border-color:white;
        }
        table{
            border-collapse:collapse;
        }
        table th{
            width:150px;
            height:30px;
            text-align:center;
            background-color:#22bbad;
            color:white;
        }
        table td{
            height:30px;
            text-align:center;
        }
    </style>

Step 4: to buttonbind the event handler method, and display all data directly on page load:

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string Res = GetSqlData();
                this.tabList.InnerHtml = Res;
            }
        }
                protected void Button1_Click(object sender, EventArgs e)
        {
            string Res = GetSqlData();
            this.tabList.InnerHtml = Res;
        }

Step 5: write GetSqlDatamethod:

        private string GetSqlData()
        {
            string SearchValue = this.TextBox1.Text;
            StringBuilder Res = new StringBuilder();
            Res.Append("<table><tr><th>序号</th><th>姓名</th><th>性别</th><th>年龄</th><th>班级</th></tr>");
            using(SqlConnection conn = new SqlConnection("Server=DESKTOP-9FCSCD4;DataBase=School;Trusted_Connection=SSPI"))
            {
                conn.Open();
                SqlCommand comm = new SqlCommand();
                //指定发送到数据库的执行命令为调用存储过程
                comm.CommandType = CommandType.StoredProcedure;
                comm.CommandText = "GetStudentList";        //存储过程的名称
                comm.Connection = conn;
                //定义存储过程中的参数
                SqlParameter Param = new SqlParameter("SearchValue", SqlDbType.VarChar, 256);
                Param.Value = SearchValue;      //设置参数值
                comm.Parameters.Add(Param);
                using(SqlDataReader DataReader = comm.ExecuteReader())
                {
                    while (DataReader.Read())
                    {
                        int ID = (int)DataReader["ID"];
                        string Name = (string)DataReader["Name"];
                        string Sex = (string)DataReader["Sex"];
                        int Age = (int)DataReader["Age"];
                        string Class = (string)DataReader["Class"];
                        Res.Append("<tr><td>" + ID + "</td>");
                        Res.Append("<td>" + Name + "</td>");
                        Res.Append("<td>" + Sex + "</td>");
                        Res.Append("<td>" + Age + "</td>");
                        Res.Append("<td>" + Class + "</td></tr>");
                    }
                }
                comm.Dispose();
            }
            Res.Append("</table>");
            return Res.ToString();
        }

carry out!