在平時的開發中，經常會用到基于某個時間段的查詢，比如選擇開始日期、結束日期.（yyyy-MM-dd格式），而在數據庫表中該列存儲的格式卻是（yyyy-MM-dd HH:MM:SS）格式，這樣就要用到如下轉換

sbSql.Append(string.Format(' AND Convert(Char(10),RegisterDate,120)<='{0}'', endRegisterDate));

1public DataTable GetOvertureDocInfoList(string boName, int isSend, string startRegisterDate, string endRegisterDate)2;;;;;{3;try4;{5;;;;;string strSql = 'SELECT * FROM GovInfo_OvertureDocument WHERE '1'='1' ';6;;;;;StringBuilder sbSql = new StringBuilder(strSql);78;;;;;if (isSend > -1)9;;;;;{10;sbSql.Append(string.Format(' AND IsSend={0}',isSend));11;;;;;}1213;;;;;if (startRegisterDate != '')14;;;;;{15;sbSql.Append(string.Format(' AND Convert(Char(10),RegisterDate,120)>='{0}'', startRegisterDate));16;;;;;}17;;;;;if (endRegisterDate != '')18;;;;;{19;sbSql.Append(string.Format(' AND Convert(Char(10),RegisterDate,120)<='{0}'', endRegisterDate));20;;;;;}2122;;;;;//if (status != '')23;;;;;//{24;;;;;//;sbSql.Append(string.Format('AND Status={0}', status));25;;;;;//}2627;;;;;sbSql.Append(' ORDER BY registerdate DESC');2829;;;;;SqlDBAccess dbaccess = new SqlDBAccess();30;;;;;DataSet ds = new DataSet();31;;;;;ds = dbaccess.ExecuteDataset(boName, CommandType.Text, sbSql.ToString());32;;;;;DataTable dt = ds.Tables[0];3334;;;;;return dt;35;}36;catch (Exception e)37;{38;;;;;LogUtil.Log.Error(this, e);39;;;;;throw e;40;}41;;;;;}