代码如下，asp.net用SQL语句查询结果怎么为空呢？

string ssfl = Request["fl"].ToString();
string ssnr=Request["ss"].ToString();
string sql = "";
//数据库连接字符串……
if (ssfl == "1")
{
sql = "select * from sh where mc like '% " + ssnr + "%' order by id asc";
}
else
if (ssfl == "2")
{
sql = "select * from doc where ( mc like '%" + ssnr + " % ' or nr like '%" + ssnr + " % ') and fl='1' order by id asc";
}
else
{
sql = "select * from doc where (mc like '%" + ssnr + " % ' or nr like '%" + ssnr + " % ') and fl='2' order by id asc";
}
OleDbDataAdapter adsa_s = new OleDbDataAdapter(sql, sqlcon);
DataSet adds_s = new DataSet();
adsa_s.Fill(adds_s);
this.DataList8.DataSource = adds_s;
this.DataList8.DataBind();

网页能正常运行，但是datalist中没有任何内容，请大神帮我看看。

请在此语句：OleDbDataAdapter adsa_s = new OleDbDataAdapter(sql, sqlcon); 增加一个断点。重新运行此网页后当系统中断运行时，重点检查并分析变量sql的内容。

adds_s这个里面有数据么？ 再看看别人怎么说的。