c#中oracle的to_date函数使用方法

例子一，获取三小时前的记录

public static DataTable Query()

{

const string sSql = "select xh,lsh,name from table where gxsj>to_date(:gxsj,'yyyy-MM-dd HH24:mi:ss')";

OracleParameter[] parameters = {new OracleParameter(":gxsj", OracleType.VarChar, 10)};

parameters[0].Value = DateTime.Now.AddHours(-3).ToString("yyyy-MM-dd HH") + ":00:00";

return DBUtility.DbHelperOra.Query(sSql, parameters).Tables[0];

}

 例子二，获取大于当前时间的记录

public static string GetHphm(string sClsbdh)
{
 const string sSql = "select name from table where sj>to_date(:yxsj,'yyyy-MM-dd')";
 OracleParameter[] paramters = {new OracleParameter("sj", OracleType.VarChar, 10)};
 paramters[0].Value = DateTime.Now.ToString("yyyy-MM-dd");

using (var mReader = DbHelperOra.ExecuteReader(sSql, paramters))
 {
     if (mReader.Read())
     {
     return mReader["name"].ToString();
     }
 }

return "";
}