在c＃中通過傳遞sql查詢來比較兩個日期

Question

我有一個名爲RETAILTRANSACTIONTABLE的表，它有一個名爲BUSINESSDATE的列，其格式爲（yyyy-mm-dd）2015-05-22。

我想用batch.StartDateTime的格式（dd-mm-yyyy hh：mm：ss）comapre這個日期05-10-2015 12:09:03。

var dateAndTime = batch.StartDateTime; 
var date = dateAndTime.ToShortDateString(); 
string query = "SELECT COUNT(discamount) AS DISCOUNTCOUNT "+ 
       " FROM ax.RETAILTRANSACTIONTABLE where "+ 
       "(CONVERT(VARCHAR(10),BUSINESSDATE,105) >= '" + date 
       + "') and DISCAMOUNT > 0 

使用上面的查詢給了我所有的專欄中，我只想值大於或等於批日期的計數

Answer 1

可以使用值：

var dateAndTime = batch.StartDateTime; 
var date = dateAndTime.ToShortDateString(); 
string query = "SELECT COUNT(discamount) AS DISCOUNTCOUNT "+ 
      " FROM ax.RETAILTRANSACTIONTABLE "+ 
      " WHERE BUSINESSDATE >= CONVERT(DATE, '" + date + "', 105) 
      and DISCAMOUNT > 0 " 

而且，獎金，如果索引存在，則使用BUSINESSDATE。

或@FelixPamittan還好說，用事先準備好的聲明具有約束力：

var dateAndTime = batch.StartDateTime; 
var date = dateAndTime.ToShortDateString(); 
string query = "SELECT COUNT(discamount) AS DISCOUNTCOUNT "+ 
      " FROM ax.RETAILTRANSACTIONTABLE "+ 
      " WHERE BUSINESSDATE >= :theDate 
      and DISCAMOUNT > 0 " 

Answer 2

我認爲這會做的伎倆爲您

var dateAndTime = batch.StartDateTime; 
var date = dateAndTime.ToShortDateString(); 
string query = "SELECT COUNT(discamount) AS DISCOUNTCOUNT " + 
       " FROM ax.RETAILTRANSACTIONTABLE WHERE" + 
       "BUSINESSDATE > = (CONVERT(VARCHAR, " + @dateParam + " ,105) >= '" + 
       + "') and DISCAMOUNT > 0 

SqlConnection connection = new SqlConnection(/* connection info */); 
SqlCommand command = new SqlCommand(query, connection); 

command.Parameters.AddWithValue("dateParam", date.ToString("yyyy/mm/dd")); 

Answer 3

通過上面的答案我修改了它的幫助並最終得到解決方案

var dateAndTime = batch.StartDateTime; 
var date = dateAndTime.ToString("yyyy-MM-dd"); 
string query = "SELECT COUNT(discamount) AS DISCOUNTCOUNT "+ 
       " FROM ax.RETAILTRANSACTIONTABLE where "+      
       "BUSINESSDATE >= '" + date + "'" + 
       " and DISCAMOUNT > 0