实现新闻搜索功能：用户输入关键字，用来匹配新闻标题或内容。

----------------------------------------------前台部分---------------------------------------------------------------

<div>

<asp:TextBox ID="txtkey" runat="server"></asp:TextBox>

<asp:Button ID="Button1" runat="server" Text="查询" onclick="Button1_Click" /><asp:Label

ID="Label1" runat="server" Text=""></asp:Label>

<div id="divResult" runat="server"></div>

</div>

运行后效果如图所示：



----------------------------------------后台部分-----------------------------------

namespace _2013_3_4sql复习

{

public partial class 参数替换 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

LoadData();

}

}

private void LoadData()

{

string constr=ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;

SqlConnection conn = new SqlConnection(constr);

conn.Open();

SqlCommand cmd = new SqlCommand();

cmd.Connection = conn;

cmd.CommandText = "SELECT NewsTitle,SUBSTRING(NewsContent,1,20)+'....' AS NewsContent,CreateTime From T_News WHERE NewsTitle LIKE @newskey OR NewsContent LIKE @newskey";

#region 参数替换的第一种方式

//cmd.Parameters.AddWithValue("@newskey","%"+txtkey.Text+"%");//如果不加%号，什么东西也不会显示

#endregion

#region 参数替换的的第二种方式

//SqlParameter SP = new SqlParameter("@newskey","%"+txtkey.Text+"%");

//cmd.Parameters.Add(SP);

#endregion

#region 参数替换的第三种方式

SqlParameter sp = new SqlParameter("@newskey",SqlDbType.VarChar);

sp.Value = "%"+txtkey.Text+"%";

cmd.Parameters.Add(sp);

#endregion

DataTable dt = new DataTable();

SqlDataAdapter adapter = new SqlDataAdapter(cmd);

adapter.Fill(dt);

Label1.Text = "共为你匹配到了"+dt.Rows.Count.ToString()+"条数据";

cmd.Dispose();

conn.Dispose();

StringBuilder sb1 = new StringBuilder();

sb1.Append("<table border=2>");

sb1.Append("<tr><td>新闻标题</td><td>新闻内容</td><td>创建时间</td></tr>");

for (int i = 0; i < dt.Rows.Count; i++)

{

sb1.Append("<tr>");

sb1.Append("<td>"+dt.Rows[i]["NewsTitle"].ToString()+"</td>");

sb1.Append("<td>"+dt.Rows[i]["NewsContent"].ToString()+"</td>");

sb1.Append("<td>"+Convert.ToDateTime(dt.Rows[i]["CreateTime"]).ToString("yyyy-MM-dd hh:mm:ss")+"</td>");

sb1.Append("</tr>");

}

sb1.Append("</table>");

divResult.InnerHtml = sb1.ToString();

}

protected void Button1_Click(object sender, EventArgs e)

{

LoadData();

}

}

}

------------------------------使用存储过程完成上面的问题----------------------------------------------------

-----------------存储过程如下---------------------

--参数名称前面一定要加@前缀

CREATE PROC Proc_GetNewsByTitle

@newskey varchar(64),

@maxcount INT OUT

AS

SELECT NewsTitle,SUBSTRING(NewsContent,1,20)+'......' AS NewsContent,CreateTime FROM T_News

WHERE NewsTitle LIKE @newskey OR NewsContent LIKE @newskey

SET @maxcount=@@ROWCOUNT

GO

---------------------------------下面是实现功能的一部分代码，其余的都一样-----------------------------------------

cmd.CommandText = "Proc_GetNewsByTitle";

cmd.CommandType = CommandType.StoredProcedure;//CommandType是枚举

cmd.Parameters.AddWithValue("@newskey", "%" + txttitle.Text + "%");

cmd.Parameters.Add("@maxcount",SqlDbType.Int);

cmd.Parameters["@maxcount"].Direction = ParameterDirection.Output;

cmd.ExecuteNonQuery();

Label1.Text="共为你匹配到了.Value.ToString]"+cmd.Parameters["@maxcount"].Value.ToString()+"条数据";

DataTable dt = new DataTable();

SqlDataAdapter adapter = new SqlDataAdapter(cmd);

adapter.Fill(dt);

cmd.Dispose();

conn.Dispose();

这是最后用户输入要搜索的关键字后查询到的结果显示：