1 string strSql = "select samlid,"; 2 strSql = strSql + "case bagclass "; 3 strSql = strSql + " when 1 then '小学' "; 4 strSql = strSql + " when 2 then '初中' "; 5 strSql = strSql + " when 3 then '高中' "; 6 strSql = strSql + " end,"; 7 strSql = strSql + " Name fron QuestionsClass"; 8 if(strWhere.Trim()!="") 9 { 10 strSql = "where" + strWhere; 11 } 12 return DbHelperSQL.Query(strSql.ToString());