using Sqystem.Data; using System.Data.SqlClient; using System.Configuration; //引用一個庫Ststem.configuration //修改根目錄的web.config文件 <configuration>//最外層節(jié)點(diǎn) ...... <connectionStrings> <add name="connString" connectionString = "Sqerver=.;DataBase=StudentManage;Uid=sa;Pwd=scale2018@"> </connectionStrings> ...... </configuration> //數(shù)據(jù)庫通用訪問類 class SQLHelper { //數(shù)據(jù)庫連接字符串 private static string connString = ConfigurationManager.ConnectionStrings["connString"].ToString(); //寫入日志文件 public void WriteLog(string msg) { FileStream fs = FileStream("1.log",fileMode.Append); StreamWriter sw = new StreamWriter(fs); sw.writeLine(DateTime.Now.ToString()+" "+ msg); sw.Close(); fs.Close(); } //數(shù)據(jù)庫更新 public static int Update(string sql) { SqlConnection conn = new SqlConnection(connString); SqlConnection cmd = new SqlCommand(sql,conn); try { conn.Open(); return cmd.ExecuteNoQuery(); } catch(Exception ex) { WriteLog("執(zhí)行更新時發(fā)生異常"+ex.Message); throw ex; } finally { conn.Close(); } } public static object GetSingleResult(string sql) { Sqlconnection conn = new SqlConnection(connString); SqlCommand cmd = new SqlCommand(sql,conn); try { conn.Open(); return cmd.ExecuteScalar(); } catch(Exception ex) { WriteLog("執(zhí)行單一結(jié)果查詢"+ex.message); throw ex; } finally { conn.Close(); } } //返回結(jié)果集 public static SqlDataReader GetReader(string sql) { SqlConnection conn = new SqlConnection(connString); SqlCommand cmd = new SqlCommand(sql,conn); try { conn.Open(); retrun cmd.ExecuteReader(CommandBehavior.CloseConnection);//不能在此關(guān)閉連接 } catch(Exception ex) { WriteLog("讀取結(jié)果集發(fā)生異常"+ex.message); throw ex; } } //帶參數(shù)的存儲過程 public static int Update(string sqlOrProcedureName,SqlParameter[]param,bool isProcedure) { SqlConnection conn = new SqlConnection(connString); SqlConnection cmd = new SqlCommand(sqlOrProcedureName,conn); if(isProcedure) { cmd.CommandType = CommmandType.StoredProcedure; } try { conn.Open(); cmd.Parameters.AddRang(param); return cmd.ExecuteNoQuery(); } catch(Exception ex) { WriteLog("執(zhí)行更新時發(fā)生異常"+ex.Message); throw ex; } finally { conn.Close(); } } }
//DAL調(diào)用數(shù)據(jù)訪問模塊
class AdminService { public UseInfo Login(UseInfo objUser) { string sql = "select UserName from UserTable where loginid=@LoginId and LoginPwn=@LoginPwn"; SqlParameter[] param = new SqlParameter[]; { new SqlPrameter("@LoginId",UseInfo.LoginId), new SqlParameter("@LoginPwd",UseInfo.LoginPwd) }; try { SqlDataReader objReader = SQLHelper.GetReader(sql,param,false); if(objReader.Read()) { objUser.UserName = objReader["UserName"].ToString(); } else { objUser = null; } objReader.Close(); } catch(Exception ex) { throw new Exception("用戶登錄異常"+ex.message); } return objUser; } }
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標(biāo)題名稱:C#數(shù)據(jù)庫操作-創(chuàng)新互聯(lián)
標(biāo)題URL:http://m.newbst.com/article44/cejohe.html
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